As an ordinary Yunnan local,I never imagined becoming so closely connected to the exotic land of Laos.The luckiest event of my life was probably my choice to tick a box on a 2007 college entrance examination applicati...As an ordinary Yunnan local,I never imagined becoming so closely connected to the exotic land of Laos.The luckiest event of my life was probably my choice to tick a box on a 2007 college entrance examination application form,indicating my willingness to enrollin a major other than my preference,which led me into the world of the Lao language.展开更多
The year 2026 marks the 65th anniversary of the establishment of diplomatic relations between China and Laos.The bilateral relations are now at a new starting point where the past has been inherited and a course for t...The year 2026 marks the 65th anniversary of the establishment of diplomatic relations between China and Laos.The bilateral relations are now at a new starting point where the past has been inherited and a course for the future has been set.Looking back,China and Laos have weathered storms together and stood by each other.展开更多
To enhance the friendship between China and Laos and jointly advance the cause of poverty reduction,the Publicity Department of the Communist Party of China (CPC) Yunnan Provincial Committee,the Center for Asia-Pacifi...To enhance the friendship between China and Laos and jointly advance the cause of poverty reduction,the Publicity Department of the Communist Party of China (CPC) Yunnan Provincial Committee,the Center for Asia-Pacific of China International Communications Group (CICG AsiaPacific), and the Lao newspaper Pasaxon (The People) co-hosted a reading club event themed “Up and Out of Poverty.” Organized by the Yunnan International Communication Center for South and Southeast Asia,the event took place at the National Library of Laos on February 6.展开更多
The year 2026 marks the 65th anniversary of diplomatic ties between China and Laos.During their meeting in Beijing in September 2025,Chinese President Xi Jinping and Lao President Thongloun Sisoulith stressed a need t...The year 2026 marks the 65th anniversary of diplomatic ties between China and Laos.During their meeting in Beijing in September 2025,Chinese President Xi Jinping and Lao President Thongloun Sisoulith stressed a need to advance the construction of the China Laos Economic Corridor and deliver more substantive results across all areas of cooperation.展开更多
On February 5, the Dialogue on Building a China-Laos Community with a Shared Future, themed “Focusing on the ‘Action Plan,’ Creating a Better Future Together,” took place in Vientiane, Laos.The opening ceremony fe...On February 5, the Dialogue on Building a China-Laos Community with a Shared Future, themed “Focusing on the ‘Action Plan,’ Creating a Better Future Together,” took place in Vientiane, Laos.The opening ceremony featured speeches by several distinguished vips including Fang Hong, Chinese ambassador to Laos, Daosavanh Kheugmixai, vice president of the Lao National Academy of Politics and Public Administration, Yu Yunquan, vice president of the China International Communications Group (CICG),Sakhon Phommalat, deputy head of the Propaganda and Training Board of the Lao People’s Revolutionary Party (LPRP) Central Committee, Sun Jisheng, vice president of China Foreign Affairs University (CFAU),and Vadthuninyom Duangmala,president of the Diplomatic Academy of Laos.展开更多
On the occasion of the 65th anniversary of the establishment of diplomatic relations between China and Laos,I wish to express,on behalf of the Embassy of the People's Republic of China in the Lao People's Demo...On the occasion of the 65th anniversary of the establishment of diplomatic relations between China and Laos,I wish to express,on behalf of the Embassy of the People's Republic of China in the Lao People's Democratic Republic,our sincere gratitude and highest respect to all friends and personages from various sectors in both countries who have long cared about and supported the development of our bilateral relations.展开更多
This year marks the 65th anniversary of diplomatic relations between China and Laos.As neighbors sharing a common border,the two nations are comrades and brothers.When China proposed the vision of building a community...This year marks the 65th anniversary of diplomatic relations between China and Laos.As neighbors sharing a common border,the two nations are comrades and brothers.When China proposed the vision of building a community with a shared future for humanity,Laos became the first to reach political consensus on establishing such a bilateral community with China.展开更多
The Luang Prabang Maintenance Management Center of the ChinaLaos Railway is still brightly lit late into the night.Zhao Renjie,director of power supply,is overseeing catenary maintenance with steady concentration.Next...The Luang Prabang Maintenance Management Center of the ChinaLaos Railway is still brightly lit late into the night.Zhao Renjie,director of power supply,is overseeing catenary maintenance with steady concentration.Next to him are Lao team leader Phouthong and his apprentice,catenary worker Khang Meng.Their busy figures form a routine yet vivid snapshot of therailway's daily operations.展开更多
From 31 March to 9 April 2025,at the invitation of Friends of China Parliamentary Association of Italy,Albania-China Friendship Association of Albania and Lao Peace and Solidarity Committee of Laos,Liu Hongcai,Vice-Pr...From 31 March to 9 April 2025,at the invitation of Friends of China Parliamentary Association of Italy,Albania-China Friendship Association of Albania and Lao Peace and Solidarity Committee of Laos,Liu Hongcai,Vice-President of the Chinese Association for International Understanding(CAFIU),and former Vice-Minister of the International Department of the CPC Central Committee(IDCPC)led a CAFIU delegation to visit Italy,Albania and Laos.The delegation engaged in in-depth discussions with political leaders as well as think tanks and civil society representatives from the three countries on such issues as bilateral relations,people-to-people exchanges,dialogue among civilisations,as well as international and regional affairs.展开更多
The Sakay gold deposit in Vientiane,Laos,is located in the Indochina landmass of the southeastern segment of the Tethys orogenic belt,specifically within the Vientiane-Pakse micro-landmass and the Vientiane-Pakse meta...The Sakay gold deposit in Vientiane,Laos,is located in the Indochina landmass of the southeastern segment of the Tethys orogenic belt,specifically within the Vientiane-Pakse micro-landmass and the Vientiane-Pakse metallogenic belt.This area is regionally significant for the concentration of minerals such as gold,copper,and tin.The host rocks of the deposit are intermediate volcanic lavas and volcanic tuffs,occurring in near-east-west brittle shear structural fractures through hydrothermal filling and metasomatism.The ore exhibits granular texture,subhedral texture,porphyritic texture,and oriented polycrystalline texture,with structural features such as disseminated,vein-like,and cataclastic breccia.The main ore minerals are pyrite,sphalerite,galena,and chalcopyrite,while the gangue minerals are primarily quartz,calcite,and dolomite.Gold is mainly present as included gold or fissure gold within the crystal lattices and microfractures of minerals such as pyrite and sphalerite.Based on mineral assemblages and generation timing,the mineralization can be divided into three stages:arsenopyrite-pyrite-dolomite-quartz(Ⅰ),sphalerite-galena-chalcopyrite-calcite(Ⅱ),and siderite(Ⅲ),with the latter stages often overlaying the former,showing evident cross-cutting and metasomatic phenomena.The surrounding rocks in the mining area are altered,mainly showing silicification,carbonatization,limonitization,sericitization,and chloritization.Preliminary studies suggest that this deposit is a low-temperature hydrothermal gold deposit within a brittle shear zone.展开更多
The Late Paleozoic-Early Mesozoic sedimentary system of the Luang Prabang Paleotethyan back-arc basin in northern Laos is important for investigating sedimentary provenance,paleogeographic patterns,and the tectonic ev...The Late Paleozoic-Early Mesozoic sedimentary system of the Luang Prabang Paleotethyan back-arc basin in northern Laos is important for investigating sedimentary provenance,paleogeographic patterns,and the tectonic evolution of the eastern Paleotethyan Ocean.This study presents systematic stratigraphy,petrology,geochemistry,and detrital zircon U-Pb-Hf isotopic analyses for the Late Carboniferous-Jurassic sedimentary strata on both sides of the Luang Prabang Basin.Based on distinct stratigraphic ages and provenance characteristics,the clastic rock samples can be divided into four groups.The Group 1 Late Carboniferous-Early Permian samples from the western part of the basin yield detrital zircon age-peaks of~348 and~1425 Ma,with correspondingεHf(t)values ranging from-2.0 to+15.5 and+1.5 to+14,respectively.The age spectrum of Group 2 Late Carboniferous-Early Permian samples from the eastern part of the basin shows major age-peaks of~287 and~1860 Ma,withεHf(t)values of-5.9--0.9 and-3.6-+4.2,respectively.Group 3 Late Permian-Triassic samples exhibit age-peaks of~242 and~1853 Ma,along withεHf(t)values of-0.7-+14.4 and-5.4--1.8,respectively.Group 4 Middle-Late Jurassic samples yield agepeaks of~237,~431,~813,~1833,and~2460 Ma,lacking Late Devonian(413-345 Ma)detrital zircons.All these data collectively suggest that the Group 1 sample primarily originated from the Sukhothai arc in western Indochina,Group 2 was from the Kontum and Truong Son in eastern Indochina,and Group 3 has a combined provenance of the Sukhothai,Kontum,and Truong Son.Regional comparisons suggest that the Jurassic provenance was mainly derived from South China,which was imported through the northern river system.Our data,combined with the regional angular unconformities between the Jurassic continental strata and pre-Jurassic marine strata,suggest that the Luang Prabang Basin transformed into a superimposed collisional retroforeland basin during the Jurassic,and the closure of the Luang Prabang BAB occurred before the Late Triassic.展开更多
A new species, Bactrocera （Zeugodacus） gansuica Chen, Han et Zhou sp. nov., is discovered from China, and B （Z.） vultus （Hardy, 1973） is recorded for the first time in Laos. These two species are here described ...A new species, Bactrocera （Zeugodacus） gansuica Chen, Han et Zhou sp. nov., is discovered from China, and B （Z.） vultus （Hardy, 1973） is recorded for the first time in Laos. These two species are here described and illustrated.展开更多
The study on the factors affecting the performance of small and medium enterprises(SMEs)in Lao PDR aims at firstly investigating the general characteristics of SMEs in Lao PDR,and secondly defining the factors affecti...The study on the factors affecting the performance of small and medium enterprises(SMEs)in Lao PDR aims at firstly investigating the general characteristics of SMEs in Lao PDR,and secondly defining the factors affecting business performance of small and medium enterprises in Lao PDR.The secondary data(2018)surveyed by World Bank enterprises were employed.The descriptive statistics were employed in order to see whether independent and dependent variables have impacts on SMEs’business performance.It was found that all small and medium enterprises were from family-based enterprises with no competition and no application of science and technology.It also revealed that the experiences of managers,services,duration of business implementation,number of laborers,number of trainings,export,access to finance,and innovation have significant relationship with SMEs’business performance.Whereas,it was found that gender of managers,size of SMEs,location,type of enterprises:manufacturing and retail,have no significant relationship with SMEs’business performance in Lao PDR.展开更多
The 2023 China-ASEAN Expo was a big deal for Lao’s DAO Coffee.The Lao Prime Minister personally visited the DAO Coffee booth,an act that not only testified to the brand’s exceptional quality but also signaled strong...The 2023 China-ASEAN Expo was a big deal for Lao’s DAO Coffee.The Lao Prime Minister personally visited the DAO Coffee booth,an act that not only testified to the brand’s exceptional quality but also signaled strong support for the country’s burgeoning coffee industry.展开更多
This study explores off-grid power generation business models in the Lao People's Democratic Republic(Lao PDR),with the objective of identifying viable pathways to expand energy access in rural and underserved reg...This study explores off-grid power generation business models in the Lao People's Democratic Republic(Lao PDR),with the objective of identifying viable pathways to expand energy access in rural and underserved regions.The research aims to analyze and evaluate various business models in terms of their technical,economic,and social viability within the unique geographic and policy context of Lao PDR.There are two level of the research objectives:High Level Objectives(HLO)and Concreted Research Objectives(CRO).For HLO is that an appropriated off-grid power generation business model for Laos supports the Lao PDR Government’s commitment to promote an inclusive green growth development agenda that ensures lowered GHG emissions and increased energy efficiency.The Lao PDR National Determined Contribution(NDC)to the United Nations Framework Convention on Climate Change(UNFCCC)notes the country’s ambitious plans to lower energy consumption and reduce GHG emissions.While the CRO are focused on learning strategies,regulation and practical lessons from other countries the ASEAN region on the off-grid development and business model.To analyze and investigate the environmental strategy of business model under external and internal context and related and considered factors.And finally,this is to conclude and recommend the off-grid power generation business model as the research conclusion,which will become a support mechanism for the companies to operate consistently over many years into the future according to ambitious goal for supplying modern and save energy for rural families by 2030.展开更多
Assessment of the forest land use change and proposed land suitability for tea for the area along Laos – China Border were the main purpose of this research paper. An integrated GIS-based analysis system （IGAS）, su...Assessment of the forest land use change and proposed land suitability for tea for the area along Laos – China Border were the main purpose of this research paper. An integrated GIS-based analysis system （IGAS）, supporting assessment of forest land-use and land suitability for the study area where along Laos-China border was developed. Multi criteria analysis and system dynamics techniques were used to assess forest land use and land suitability and to forecast potential land-use for tea. The total study area is estimated at 10 325.07 km2 according to the field data collection and data analysis. The area of current forest cover decreased rapidly from 6337.33 km2 （61.38%） in 1992 to 5106.28 km2 （49.46%） in 2002 in the study area. The current forest was mainly trans-ferred to potential forest and permanent agriculture especially to rubber plantation areas even in the National Conservation Biodiversity Conser-vation Areas. The main causes of forest land use change are poverty. In order to address the problems, land suitability classification for tea was developed based on the multi-criteria. And finally two options of land suitability classification for tea for the study areas were developed.展开更多
An integrated study of zircon U-Pb geochronology and petrochemistry, together with zircon Lu-Hf isotopes, has been carried out on the basaltic-andesitic tuff and volcanic breccia from the Nam Hang Formation and andesi...An integrated study of zircon U-Pb geochronology and petrochemistry, together with zircon Lu-Hf isotopes, has been carried out on the basaltic-andesitic tuff and volcanic breccia from the Nam Hang Formation and andesitic tuff from the Muang-Nan Formation in the Xaignabouli area, which had been mapped as the Permian–Early Triassic on the 1 : 1 000 000 geological map or Late Carboniferous on the 1 : 200 000 geological maps. Zircon U-Pb dating of three samples yielded weighted mean ages of 235±2.6, 232±1.4 and 278±2.8 Ma, respectively, suggesting a Late Triassic origin for the Nam Hang Formation and an Early Permian origin for the Muang-Nan Formation. Geochemically, they are characterized by depletions in HFSEs(e.g., Nb, Ta, Ti) and high LILE/HFSE ratios, and they have positive zircon ε_(Hf)(t) values of 8.7–15.9, which exhibits the continental arc volcanic affinity and partial melting of subducting oceanic slab in the magma source. Combined with spatial occurrence of the volcanic rock and existing geochronological and geochemical data, we suggest that the Xaignabouli-Luang Prabang volcanic belt can be linked to the Loei-Phetchabun belt. The Permian–Triassic volcanic rocks in this belt might be a product of the Nan back-arc basin eastward subduction.展开更多
The Phapon gold deposit, located in northern Laos, is a unique large-scale gold deposit in Luang Prabang-Loei metallogenic belt. It is hosted in the Lower Permian limestone and controlled by a NE-trending ductile-brit...The Phapon gold deposit, located in northern Laos, is a unique large-scale gold deposit in Luang Prabang-Loei metallogenic belt. It is hosted in the Lower Permian limestone and controlled by a NE-trending ductile-brittle fault system. There are three types of primary ore including auriferous calcite vein type, disseminated type, and breccia type, and the first two are important in the Phapon gold deposit. Based on fluid inclusion petrography and microthermometry, three types of primary fluid inclusions including type 1 liquid-rich aqueous, type 2 vapor-rich aqueous and type 3 daughter mineralbearing aqueous were identified in hydrothermal calcite grains. The ore-forming fluids are normally homogeneous, as indicated by the widespread type 1 inclusions with identical composition. The coexistence of type 1 and type 2 inclusions, showing similar final homogenization temperature but different compositions, indicate that fluid immiscibility did locally take place in both two types of ores. The results of microthermometry and H-O isotopes geochemistry indicate that there are little differences on ore-fluid geochemistry between the auriferous calcite vein-type and disseminated type ores. The oreforming fluids are characterized by medium-low temperatures(157–268 oC) and low salinity(1.6 wt.%–9.9 wt.% NaCl eq.). It is likely to have a metamorphic-dominant mixed source, which could be associated with dehydration and decarbonisation of Lower Permian limestone and Middle–Upper Triassic sandstones during the dynamic metamorphism. The fluid-wallrock interaction played a major role, and the locally occurred fluid-immiscible processes played a subordinate role in gold precipitation. Combined with the regional and ore deposit geology, and ore-fluid geochemistry, we suggest that the Phapon gold deposit is best considered to be a member of the epizonal orogenic deposit class.展开更多
Rubber plantation is the major land use type in Southeast Asia. Monitoring the spa- tial-temporal pattern of rubber plantation is significant for regional land resource development, eco-environmental protection, and m...Rubber plantation is the major land use type in Southeast Asia. Monitoring the spa- tial-temporal pattern of rubber plantation is significant for regional land resource development, eco-environmental protection, and maintaining border security. With remote sensing tech- nologies, we analyzed the rubber distribution pattern and spatial-temporal dynamic; with GIS and a newly proposed index of Planted Intensity （PI）, we further quantified the impacts and limits of topographical factors on rubber plantation in the border region of China, Laos and Myanmar （BRCLM） between 1980 and 2010. The results showed that： （1） As the dominant land use type in this border region, the acreage of rubber plantation was 6014 km2 in 2010, accounting for 8.17% of the total area. Viewing from the rubber plantation structure, the ratio of mature- （〉10 year） and young rubber plantation （〈 10 year） was 5：7. （2） From 1980 to 2010, rubber plantation expanded significantly in BRCLM, from 705 km2 to 6014 km2, nearly nine times. The distribution characteristics of rubber plantation varied from concentrated toward dispersed, from border inside to outside, and expanded further in all directions with Jinghong City as the center. （3） Restricted by the topographical factors, more than 4/5 proportion of rubber plantation concentrated in the appropriate elevation gradients between 600 and 1000 m, rarely occurred in elevations beyond 1200 m in BRCLM. Nearly 2/3 of rubber plantation concentrated on slopes of 8^-25~, rarely distributed on slopes above 35~. Rubber plantation was primarily distributed in south and east aspects, relatively few in north and west aspects. Rubber planted intensity displayed the similar distribution trend. （4） Comparative studies of rubber plantation in different countries showed that there was a remarkable increase in area at higher elevations and steeper slopes in China, while there were large appropriate topog- raphical gradients for rubber plantation in Laos and Myanmar which benefited China for rubber trans-boundary expansion. （5） Rubber plantation in BRCLM will definitely expend cross borders of China to the territories of Laos and Myanmar, and the continuous expansion in the border region of China will be inevitable.展开更多
文摘As an ordinary Yunnan local,I never imagined becoming so closely connected to the exotic land of Laos.The luckiest event of my life was probably my choice to tick a box on a 2007 college entrance examination application form,indicating my willingness to enrollin a major other than my preference,which led me into the world of the Lao language.
文摘The year 2026 marks the 65th anniversary of the establishment of diplomatic relations between China and Laos.The bilateral relations are now at a new starting point where the past has been inherited and a course for the future has been set.Looking back,China and Laos have weathered storms together and stood by each other.
文摘To enhance the friendship between China and Laos and jointly advance the cause of poverty reduction,the Publicity Department of the Communist Party of China (CPC) Yunnan Provincial Committee,the Center for Asia-Pacific of China International Communications Group (CICG AsiaPacific), and the Lao newspaper Pasaxon (The People) co-hosted a reading club event themed “Up and Out of Poverty.” Organized by the Yunnan International Communication Center for South and Southeast Asia,the event took place at the National Library of Laos on February 6.
文摘The year 2026 marks the 65th anniversary of diplomatic ties between China and Laos.During their meeting in Beijing in September 2025,Chinese President Xi Jinping and Lao President Thongloun Sisoulith stressed a need to advance the construction of the China Laos Economic Corridor and deliver more substantive results across all areas of cooperation.
文摘On February 5, the Dialogue on Building a China-Laos Community with a Shared Future, themed “Focusing on the ‘Action Plan,’ Creating a Better Future Together,” took place in Vientiane, Laos.The opening ceremony featured speeches by several distinguished vips including Fang Hong, Chinese ambassador to Laos, Daosavanh Kheugmixai, vice president of the Lao National Academy of Politics and Public Administration, Yu Yunquan, vice president of the China International Communications Group (CICG),Sakhon Phommalat, deputy head of the Propaganda and Training Board of the Lao People’s Revolutionary Party (LPRP) Central Committee, Sun Jisheng, vice president of China Foreign Affairs University (CFAU),and Vadthuninyom Duangmala,president of the Diplomatic Academy of Laos.
文摘On the occasion of the 65th anniversary of the establishment of diplomatic relations between China and Laos,I wish to express,on behalf of the Embassy of the People's Republic of China in the Lao People's Democratic Republic,our sincere gratitude and highest respect to all friends and personages from various sectors in both countries who have long cared about and supported the development of our bilateral relations.
文摘This year marks the 65th anniversary of diplomatic relations between China and Laos.As neighbors sharing a common border,the two nations are comrades and brothers.When China proposed the vision of building a community with a shared future for humanity,Laos became the first to reach political consensus on establishing such a bilateral community with China.
文摘The Luang Prabang Maintenance Management Center of the ChinaLaos Railway is still brightly lit late into the night.Zhao Renjie,director of power supply,is overseeing catenary maintenance with steady concentration.Next to him are Lao team leader Phouthong and his apprentice,catenary worker Khang Meng.Their busy figures form a routine yet vivid snapshot of therailway's daily operations.
文摘From 31 March to 9 April 2025,at the invitation of Friends of China Parliamentary Association of Italy,Albania-China Friendship Association of Albania and Lao Peace and Solidarity Committee of Laos,Liu Hongcai,Vice-President of the Chinese Association for International Understanding(CAFIU),and former Vice-Minister of the International Department of the CPC Central Committee(IDCPC)led a CAFIU delegation to visit Italy,Albania and Laos.The delegation engaged in in-depth discussions with political leaders as well as think tanks and civil society representatives from the three countries on such issues as bilateral relations,people-to-people exchanges,dialogue among civilisations,as well as international and regional affairs.
文摘The Sakay gold deposit in Vientiane,Laos,is located in the Indochina landmass of the southeastern segment of the Tethys orogenic belt,specifically within the Vientiane-Pakse micro-landmass and the Vientiane-Pakse metallogenic belt.This area is regionally significant for the concentration of minerals such as gold,copper,and tin.The host rocks of the deposit are intermediate volcanic lavas and volcanic tuffs,occurring in near-east-west brittle shear structural fractures through hydrothermal filling and metasomatism.The ore exhibits granular texture,subhedral texture,porphyritic texture,and oriented polycrystalline texture,with structural features such as disseminated,vein-like,and cataclastic breccia.The main ore minerals are pyrite,sphalerite,galena,and chalcopyrite,while the gangue minerals are primarily quartz,calcite,and dolomite.Gold is mainly present as included gold or fissure gold within the crystal lattices and microfractures of minerals such as pyrite and sphalerite.Based on mineral assemblages and generation timing,the mineralization can be divided into three stages:arsenopyrite-pyrite-dolomite-quartz(Ⅰ),sphalerite-galena-chalcopyrite-calcite(Ⅱ),and siderite(Ⅲ),with the latter stages often overlaying the former,showing evident cross-cutting and metasomatic phenomena.The surrounding rocks in the mining area are altered,mainly showing silicification,carbonatization,limonitization,sericitization,and chloritization.Preliminary studies suggest that this deposit is a low-temperature hydrothermal gold deposit within a brittle shear zone.
基金supported by the National Key Research and Development Program of China(No.2023YFF0803701)the National Natural Science Foundation of China(Nos.42330302 and 42472265)the Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)(No.SML2023SP239)。
文摘The Late Paleozoic-Early Mesozoic sedimentary system of the Luang Prabang Paleotethyan back-arc basin in northern Laos is important for investigating sedimentary provenance,paleogeographic patterns,and the tectonic evolution of the eastern Paleotethyan Ocean.This study presents systematic stratigraphy,petrology,geochemistry,and detrital zircon U-Pb-Hf isotopic analyses for the Late Carboniferous-Jurassic sedimentary strata on both sides of the Luang Prabang Basin.Based on distinct stratigraphic ages and provenance characteristics,the clastic rock samples can be divided into four groups.The Group 1 Late Carboniferous-Early Permian samples from the western part of the basin yield detrital zircon age-peaks of~348 and~1425 Ma,with correspondingεHf(t)values ranging from-2.0 to+15.5 and+1.5 to+14,respectively.The age spectrum of Group 2 Late Carboniferous-Early Permian samples from the eastern part of the basin shows major age-peaks of~287 and~1860 Ma,withεHf(t)values of-5.9--0.9 and-3.6-+4.2,respectively.Group 3 Late Permian-Triassic samples exhibit age-peaks of~242 and~1853 Ma,along withεHf(t)values of-0.7-+14.4 and-5.4--1.8,respectively.Group 4 Middle-Late Jurassic samples yield agepeaks of~237,~431,~813,~1833,and~2460 Ma,lacking Late Devonian(413-345 Ma)detrital zircons.All these data collectively suggest that the Group 1 sample primarily originated from the Sukhothai arc in western Indochina,Group 2 was from the Kontum and Truong Son in eastern Indochina,and Group 3 has a combined provenance of the Sukhothai,Kontum,and Truong Son.Regional comparisons suggest that the Jurassic provenance was mainly derived from South China,which was imported through the northern river system.Our data,combined with the regional angular unconformities between the Jurassic continental strata and pre-Jurassic marine strata,suggest that the Luang Prabang Basin transformed into a superimposed collisional retroforeland basin during the Jurassic,and the closure of the Luang Prabang BAB occurred before the Late Triassic.
基金supported by the National Natural Science Foundation of China (30770267)Special Fund for Entry-Exit Inspections and Quarantine Scientific Research in the Public Interest (201210079)
文摘A new species, Bactrocera （Zeugodacus） gansuica Chen, Han et Zhou sp. nov., is discovered from China, and B （Z.） vultus （Hardy, 1973） is recorded for the first time in Laos. These two species are here described and illustrated.
文摘The study on the factors affecting the performance of small and medium enterprises(SMEs)in Lao PDR aims at firstly investigating the general characteristics of SMEs in Lao PDR,and secondly defining the factors affecting business performance of small and medium enterprises in Lao PDR.The secondary data(2018)surveyed by World Bank enterprises were employed.The descriptive statistics were employed in order to see whether independent and dependent variables have impacts on SMEs’business performance.It was found that all small and medium enterprises were from family-based enterprises with no competition and no application of science and technology.It also revealed that the experiences of managers,services,duration of business implementation,number of laborers,number of trainings,export,access to finance,and innovation have significant relationship with SMEs’business performance.Whereas,it was found that gender of managers,size of SMEs,location,type of enterprises:manufacturing and retail,have no significant relationship with SMEs’business performance in Lao PDR.
文摘The 2023 China-ASEAN Expo was a big deal for Lao’s DAO Coffee.The Lao Prime Minister personally visited the DAO Coffee booth,an act that not only testified to the brand’s exceptional quality but also signaled strong support for the country’s burgeoning coffee industry.
文摘This study explores off-grid power generation business models in the Lao People's Democratic Republic(Lao PDR),with the objective of identifying viable pathways to expand energy access in rural and underserved regions.The research aims to analyze and evaluate various business models in terms of their technical,economic,and social viability within the unique geographic and policy context of Lao PDR.There are two level of the research objectives:High Level Objectives(HLO)and Concreted Research Objectives(CRO).For HLO is that an appropriated off-grid power generation business model for Laos supports the Lao PDR Government’s commitment to promote an inclusive green growth development agenda that ensures lowered GHG emissions and increased energy efficiency.The Lao PDR National Determined Contribution(NDC)to the United Nations Framework Convention on Climate Change(UNFCCC)notes the country’s ambitious plans to lower energy consumption and reduce GHG emissions.While the CRO are focused on learning strategies,regulation and practical lessons from other countries the ASEAN region on the off-grid development and business model.To analyze and investigate the environmental strategy of business model under external and internal context and related and considered factors.And finally,this is to conclude and recommend the off-grid power generation business model as the research conclusion,which will become a support mechanism for the companies to operate consistently over many years into the future according to ambitious goal for supplying modern and save energy for rural families by 2030.
文摘Assessment of the forest land use change and proposed land suitability for tea for the area along Laos – China Border were the main purpose of this research paper. An integrated GIS-based analysis system （IGAS）, supporting assessment of forest land-use and land suitability for the study area where along Laos-China border was developed. Multi criteria analysis and system dynamics techniques were used to assess forest land use and land suitability and to forecast potential land-use for tea. The total study area is estimated at 10 325.07 km2 according to the field data collection and data analysis. The area of current forest cover decreased rapidly from 6337.33 km2 （61.38%） in 1992 to 5106.28 km2 （49.46%） in 2002 in the study area. The current forest was mainly trans-ferred to potential forest and permanent agriculture especially to rubber plantation areas even in the National Conservation Biodiversity Conser-vation Areas. The main causes of forest land use change are poverty. In order to address the problems, land suitability classification for tea was developed based on the multi-criteria. And finally two options of land suitability classification for tea for the study areas were developed.
基金financially supported by the China Geological Survey (No. 121201010000150013)
文摘An integrated study of zircon U-Pb geochronology and petrochemistry, together with zircon Lu-Hf isotopes, has been carried out on the basaltic-andesitic tuff and volcanic breccia from the Nam Hang Formation and andesitic tuff from the Muang-Nan Formation in the Xaignabouli area, which had been mapped as the Permian–Early Triassic on the 1 : 1 000 000 geological map or Late Carboniferous on the 1 : 200 000 geological maps. Zircon U-Pb dating of three samples yielded weighted mean ages of 235±2.6, 232±1.4 and 278±2.8 Ma, respectively, suggesting a Late Triassic origin for the Nam Hang Formation and an Early Permian origin for the Muang-Nan Formation. Geochemically, they are characterized by depletions in HFSEs(e.g., Nb, Ta, Ti) and high LILE/HFSE ratios, and they have positive zircon ε_(Hf)(t) values of 8.7–15.9, which exhibits the continental arc volcanic affinity and partial melting of subducting oceanic slab in the magma source. Combined with spatial occurrence of the volcanic rock and existing geochronological and geochemical data, we suggest that the Xaignabouli-Luang Prabang volcanic belt can be linked to the Loei-Phetchabun belt. The Permian–Triassic volcanic rocks in this belt might be a product of the Nan back-arc basin eastward subduction.
基金financially supported by the China Geological Survey Project (No. 121201010000150013)
文摘The Phapon gold deposit, located in northern Laos, is a unique large-scale gold deposit in Luang Prabang-Loei metallogenic belt. It is hosted in the Lower Permian limestone and controlled by a NE-trending ductile-brittle fault system. There are three types of primary ore including auriferous calcite vein type, disseminated type, and breccia type, and the first two are important in the Phapon gold deposit. Based on fluid inclusion petrography and microthermometry, three types of primary fluid inclusions including type 1 liquid-rich aqueous, type 2 vapor-rich aqueous and type 3 daughter mineralbearing aqueous were identified in hydrothermal calcite grains. The ore-forming fluids are normally homogeneous, as indicated by the widespread type 1 inclusions with identical composition. The coexistence of type 1 and type 2 inclusions, showing similar final homogenization temperature but different compositions, indicate that fluid immiscibility did locally take place in both two types of ores. The results of microthermometry and H-O isotopes geochemistry indicate that there are little differences on ore-fluid geochemistry between the auriferous calcite vein-type and disseminated type ores. The oreforming fluids are characterized by medium-low temperatures(157–268 oC) and low salinity(1.6 wt.%–9.9 wt.% NaCl eq.). It is likely to have a metamorphic-dominant mixed source, which could be associated with dehydration and decarbonisation of Lower Permian limestone and Middle–Upper Triassic sandstones during the dynamic metamorphism. The fluid-wallrock interaction played a major role, and the locally occurred fluid-immiscible processes played a subordinate role in gold precipitation. Combined with the regional and ore deposit geology, and ore-fluid geochemistry, we suggest that the Phapon gold deposit is best considered to be a member of the epizonal orogenic deposit class.
基金National Natural Science Foundation of China, No.41271117 Strategy of Science and Technology Planning Project of Institute of Geographic Sciences and Natural Resources Research, CAS, No.2012SJ008
文摘Rubber plantation is the major land use type in Southeast Asia. Monitoring the spa- tial-temporal pattern of rubber plantation is significant for regional land resource development, eco-environmental protection, and maintaining border security. With remote sensing tech- nologies, we analyzed the rubber distribution pattern and spatial-temporal dynamic; with GIS and a newly proposed index of Planted Intensity （PI）, we further quantified the impacts and limits of topographical factors on rubber plantation in the border region of China, Laos and Myanmar （BRCLM） between 1980 and 2010. The results showed that： （1） As the dominant land use type in this border region, the acreage of rubber plantation was 6014 km2 in 2010, accounting for 8.17% of the total area. Viewing from the rubber plantation structure, the ratio of mature- （〉10 year） and young rubber plantation （〈 10 year） was 5：7. （2） From 1980 to 2010, rubber plantation expanded significantly in BRCLM, from 705 km2 to 6014 km2, nearly nine times. The distribution characteristics of rubber plantation varied from concentrated toward dispersed, from border inside to outside, and expanded further in all directions with Jinghong City as the center. （3） Restricted by the topographical factors, more than 4/5 proportion of rubber plantation concentrated in the appropriate elevation gradients between 600 and 1000 m, rarely occurred in elevations beyond 1200 m in BRCLM. Nearly 2/3 of rubber plantation concentrated on slopes of 8^-25~, rarely distributed on slopes above 35~. Rubber plantation was primarily distributed in south and east aspects, relatively few in north and west aspects. Rubber planted intensity displayed the similar distribution trend. （4） Comparative studies of rubber plantation in different countries showed that there was a remarkable increase in area at higher elevations and steeper slopes in China, while there were large appropriate topog- raphical gradients for rubber plantation in Laos and Myanmar which benefited China for rubber trans-boundary expansion. （5） Rubber plantation in BRCLM will definitely expend cross borders of China to the territories of Laos and Myanmar, and the continuous expansion in the border region of China will be inevitable.
