The Yarlung Zangbo Suture Zone(YZSZ)on the southern margin of the Lhasa block and the Tangjia-Sumdo ultrahigh-pressure metamorphic belt(TSMB)within the block represent natural laboratories for the study of plate tecto...The Yarlung Zangbo Suture Zone(YZSZ)on the southern margin of the Lhasa block and the Tangjia-Sumdo ultrahigh-pressure metamorphic belt(TSMB)within the block represent natural laboratories for the study of plate tectonics and oceanic slab subduction.It is generally believed that these two zones represent the remnants of the ancient oceanic crust and upper mantle of the Yarlung Zangbo Neo-Tethys(YZNT)and the Tangjia-Sumdo Paleo-Tethys(TSPT).However,the evolutionary patterns and spatiotemporal relationships of the TSPT and the YZNT have been debated.展开更多
Following the publication,concerns have been raised about a number of figures in this article.An unexpected area of similarity was identified in terms of the cellular data,where the results from differently performed ...Following the publication,concerns have been raised about a number of figures in this article.An unexpected area of similarity was identified in terms of the cellular data,where the results from differently performed experiments were intended to have been shown,although the areas immediately surrounding this area featured comparatively different distributions of cells.展开更多
The Middle to Late Jurassic,high-pressure metamorphic ophiolites of Inzecca Unit are well exposed in the Noceta-Vezzani area of Alpine Corsica.These metaophiolites were studied by using a multidisciplinary approach to...The Middle to Late Jurassic,high-pressure metamorphic ophiolites of Inzecca Unit are well exposed in the Noceta-Vezzani area of Alpine Corsica.These metaophiolites were studied by using a multidisciplinary approach to reconstruct the architecture of the oceanic sector from which they derived.The collected data indicate that this oceanic crust consists of a mantle metaperidotites and metaophicalcites,both covered by massive or pillow metabasalts with or without a layer of ophiolite-bearing metabreccias.展开更多
The western Kunlun orogen in the northwest Tibet Plateau is related to subduction and collision of Proto-and Paleo-Tethys from early Paleozoic to early Mesozoic. This paper presents new LA-ICPMS zircon U-Pb ages and L...The western Kunlun orogen in the northwest Tibet Plateau is related to subduction and collision of Proto-and Paleo-Tethys from early Paleozoic to early Mesozoic. This paper presents new LA-ICPMS zircon U-Pb ages and Lu-Hf isotopes, whole-rock major and trace elements, and Sr–Nd isotopes of two Ordovician granitoid plutons(466–455 Ma) and their Silurian mafic dikes(～436 Ma) in the western Kunlun orogen. These granitoids show peraluminous high-K calcalkaline characteristics, with(^(87)Sr/^(86)Sr)_i value of 0.7129–0.7224, ε_(Nd)(t) values of -9.3 to -7.0 and zircon ε_(Hf)(t) values of -17.3 to -0.2, indicating that they were formed by partial melting of ancient lower-crust(metaigneous rocks mixed with metasedimentary rocks) with some mantle materials in response to subduction of the Proto-Tethyan Ocean and following collision. The Silurian mafic dikes were considered to have been derived from a low degree of partial melting of primary mafic magma. These mafic dikes show initial ^(87)Sr/^(86)Sr ratios of 0.7101–0.7152 and ε_(Nd)(t) values of -3.8 to -3.4 and zircon ε_(Hf)(t) values of -8.8 to -4.9, indicating that they were derived from enriched mantle in response to post-collisional slab break-off. Combined with regional geology, our new data provide valuable insight into late evolution of the Proto-Tethys.展开更多
High-temperature magma generation process and granulite-facies metamorphism can provide important information about mantle-crustal interaction and tectonic evolution. The strongly peralu- minous monzonite pluton, the ...High-temperature magma generation process and granulite-facies metamorphism can provide important information about mantle-crustal interaction and tectonic evolution. The strongly peralu- minous monzonite pluton, the Jinshuikou cordierite granite on the southern margin of the Qaidam Block, can provide important information about the mantle-crustal interaction and constraints on tectonic tran- sition from Proto-Tethys to Paleo-Tethys. This pluton develops enclaves of mafic granulite, amphibolite and quartzofeldspathic rocks, and is cut by massive monzonitic leuco-granite veins. Zircon and monazite U-Pb dating for the cordierite granite, the granulite enclaves and a massive monzonitic leuco-granite vein reveal that the cordierite granitic magma was generated from Mesoproterozoic continental crust with protolith derived from a provenanee that was composed of 〉2.8 Ga old recycled crustal materials and re- corded a -1.7 Ga magmatic event. The continental crust underwent low-pressure granulite-facies metamorphism at -380 Ma ago, whereas the cordierite granite magmas was generated and emplaced during 380 Ma, followed by intrusion of the massive monzonitic leuco-granite vein at circa 370-330 Ma. These data suggest that after the final closure of Proto-Tethys Ocean spreading along the southern Qaidam Block at -420 Ma, break-off of the subducted slab or delamination of the lower crustal base and upwelling of the asthenospheric mantle beneath the southern Qaidam Block occurred before the Mid-Devonian, and that the initiation of the Paleo-Tethys tectonics might initiate near the end of Early-Carboniferous in the East Kunlun-Qaidam region, East Asia.展开更多
High-Al chromite from the Kudi chromitites contains a wide range of mineral inclusions. They include clinopyroxene, amphibole, phlogopite, olivine, orthopyroxene, apatite, base-metal sulfides, calcite and brucite. The...High-Al chromite from the Kudi chromitites contains a wide range of mineral inclusions. They include clinopyroxene, amphibole, phlogopite, olivine, orthopyroxene, apatite, base-metal sulfides, calcite and brucite. The modal abundance of inclusions vary greatly among different grains of chromite. The common inclusions are clinopyroxene and amphibole, which occur as monomineral or polymineral associated with other minerals. The shapes of these inclusions tend to follow the growth plane of host chromite. Mineral assemblages and textures demonstrate that some inclusions（olivine, clinopyroxene） are trapped during magmatic stage, and most of the inclusions（e.g., amphibole, phlogopite） are trapped during recrystallization of chromite. Sulfide inclusions are pentlandite, chalcopyrite and cubanite. They occur either as isolated grains or together with silicate minerals, and formed from the separation of sulfide-bearing liquid from silicate magma. The parental magma of chromitites contains Al2O3 15.0wt%–16.5wt%, TiO20.30wt%–1.05wt% based on calculation with the composition of chromite, similar to parental magma of high-Al chromitites from elsewhere and the estimated melt composition is comparable with that of MORB. Considering the high-Mg olivine in disseminated chromitite and abundant hydrous inclusions, we propose that Kudi chromitites formed beneath a volcanic front during the subduction initiation of Proto-Tethys.展开更多
PROTOS 2C卷烟机通过压缩空气向胶水桶内加压以保证连续不断向喷胶嘴供胶,但容易出现胶水桶内表层胶水产生胶皮和凝结成块,堵塞胶水管路及喷嘴的情况,针对这个问题,我们在继续使用原有压缩空气系统的情况下,在桶盖上原有安全阀位置处安...PROTOS 2C卷烟机通过压缩空气向胶水桶内加压以保证连续不断向喷胶嘴供胶,但容易出现胶水桶内表层胶水产生胶皮和凝结成块,堵塞胶水管路及喷嘴的情况,针对这个问题,我们在继续使用原有压缩空气系统的情况下,在桶盖上原有安全阀位置处安装快插气管接头,接入或门型梭阀,使得压缩空气不向外界排出,不带走胶水水分,问题得到解决。目前已应用于卷包一车间10台PROTOS 2C卷接机组,应用效果良好。The PROTOS 2C cigarette machine pressurizes the glue bucket with compressed air to ensure continuous supply of glue to the spray nozzle. However, it is prone to the occurrence of glue on the surface of the glue bucket forming rubber skin and clumping, blocking the glue pipeline and nozzle. In response to this problem, we have installed a quick insertion air pipe joint at the original safety valve position on the bucket cover while continuing to use the original compressed air system, and connected it to a door type shuttle valve to prevent compressed air from being discharged to the outside and not taking away glue moisture, thus solving the problem. At present, it has been applied to 10 PROTOS 2C winding and splicing units in the first packaging workshop, and the application effect is good.展开更多
本论文涉及一种烟草行业卷接设备电气维修工装,适用于PROTOS 2C卷烟机Y1M、Y2M、Y3M剔除阀门的安装与拆卸。该工装由长柄臂、手柄和套筒三部分构成,均采用不锈钢材质。长柄臂直径为10 mm,一端95 mm处沿90度折弯处理,并与直径为15 mm、...本论文涉及一种烟草行业卷接设备电气维修工装,适用于PROTOS 2C卷烟机Y1M、Y2M、Y3M剔除阀门的安装与拆卸。该工装由长柄臂、手柄和套筒三部分构成,均采用不锈钢材质。长柄臂直径为10 mm,一端95 mm处沿90度折弯处理,并与直径为15 mm、长度为30 mm的不锈钢套筒焊接连接。套筒通孔端面设计为8 × 6 mm的方孔,并在此基础上,以方孔长边为弦,中心为圆心,设计半径为5 mm的圆。该工装能够实现剔除阀门的快速、精准安装与拆卸,具有结构简单、操作便捷、调整精确和适用范围广泛等优点。This paper relates to an electrical maintenance tool for tobacco industry winding equipment, which is suitable for the installation and disassembly of PROTOS 2C cigarette machine Y1M, Y2M, Y3M eliminator valves. The tool is composed of three parts: a long handle arm, a handle and a sleeve, all of which are made of stainless steel. The long handle arm has a diameter of 10mm, one end of 95 mm is bent along 90 degrees, and is welded with a stainless steel sleeve with a diameter of 15 mm and a length of 30 mm. The end face of the sleeve through hole is designed as a square hole of 8 × 6 mm, and on this basis, the long side of the square hole is the string, the center is the center of the circle, and the design radius is 5 mm. The tool can realize the fast and accurate installation and disassembly of the culling valve, and has the advantages of simple structure, convenient operation, accurate adjustment and wide application range.展开更多
基金supported by the Science and Technology Research Program of Chongqing Municipal Education Commission(Grant No.KJQN202404310,KJQN202304302)National Natural Science Foundation of China(41972118).
文摘The Yarlung Zangbo Suture Zone(YZSZ)on the southern margin of the Lhasa block and the Tangjia-Sumdo ultrahigh-pressure metamorphic belt(TSMB)within the block represent natural laboratories for the study of plate tectonics and oceanic slab subduction.It is generally believed that these two zones represent the remnants of the ancient oceanic crust and upper mantle of the Yarlung Zangbo Neo-Tethys(YZNT)and the Tangjia-Sumdo Paleo-Tethys(TSPT).However,the evolutionary patterns and spatiotemporal relationships of the TSPT and the YZNT have been debated.
文摘Following the publication,concerns have been raised about a number of figures in this article.An unexpected area of similarity was identified in terms of the cellular data,where the results from differently performed experiments were intended to have been shown,although the areas immediately surrounding this area featured comparatively different distributions of cells.
基金supported by PRIN 2020 project(Resp.Michele Marroni)Claudia D’Oriano(INGV)Matteo Masotta and Danis Filimon(Earth Science Dept)are also thanked for analytical support in the laboratoriesThis work benefited from the PRA 2022 project handled by Francesca Meneghini.
文摘The Middle to Late Jurassic,high-pressure metamorphic ophiolites of Inzecca Unit are well exposed in the Noceta-Vezzani area of Alpine Corsica.These metaophiolites were studied by using a multidisciplinary approach to reconstruct the architecture of the oceanic sector from which they derived.The collected data indicate that this oceanic crust consists of a mantle metaperidotites and metaophicalcites,both covered by massive or pillow metabasalts with or without a layer of ophiolite-bearing metabreccias.
基金funded by the Strategic Priority Research Program of Chinese Academy of Sciences,Grant No.XDA20070304the Fundamental Research Funds for the Chinese Academy of Geological Sciences(YYWF201601)+1 种基金projects of China Geological Survey(DD20160004,20160083-1,12120115000801,121201101000150014)the National Natural Science Foundation of China(grant 41772232)
文摘The western Kunlun orogen in the northwest Tibet Plateau is related to subduction and collision of Proto-and Paleo-Tethys from early Paleozoic to early Mesozoic. This paper presents new LA-ICPMS zircon U-Pb ages and Lu-Hf isotopes, whole-rock major and trace elements, and Sr–Nd isotopes of two Ordovician granitoid plutons(466–455 Ma) and their Silurian mafic dikes(～436 Ma) in the western Kunlun orogen. These granitoids show peraluminous high-K calcalkaline characteristics, with(^(87)Sr/^(86)Sr)_i value of 0.7129–0.7224, ε_(Nd)(t) values of -9.3 to -7.0 and zircon ε_(Hf)(t) values of -17.3 to -0.2, indicating that they were formed by partial melting of ancient lower-crust(metaigneous rocks mixed with metasedimentary rocks) with some mantle materials in response to subduction of the Proto-Tethyan Ocean and following collision. The Silurian mafic dikes were considered to have been derived from a low degree of partial melting of primary mafic magma. These mafic dikes show initial ^(87)Sr/^(86)Sr ratios of 0.7101–0.7152 and ε_(Nd)(t) values of -3.8 to -3.4 and zircon ε_(Hf)(t) values of -8.8 to -4.9, indicating that they were derived from enriched mantle in response to post-collisional slab break-off. Combined with regional geology, our new data provide valuable insight into late evolution of the Proto-Tethys.
基金supported by the National Natural Science Foundation of China(Nos.40972042,40772041,42072030)the Open Research Program of the Key Laboratory of Continental Dynamics,Northwest University
文摘High-temperature magma generation process and granulite-facies metamorphism can provide important information about mantle-crustal interaction and tectonic evolution. The strongly peralu- minous monzonite pluton, the Jinshuikou cordierite granite on the southern margin of the Qaidam Block, can provide important information about the mantle-crustal interaction and constraints on tectonic tran- sition from Proto-Tethys to Paleo-Tethys. This pluton develops enclaves of mafic granulite, amphibolite and quartzofeldspathic rocks, and is cut by massive monzonitic leuco-granite veins. Zircon and monazite U-Pb dating for the cordierite granite, the granulite enclaves and a massive monzonitic leuco-granite vein reveal that the cordierite granitic magma was generated from Mesoproterozoic continental crust with protolith derived from a provenanee that was composed of 〉2.8 Ga old recycled crustal materials and re- corded a -1.7 Ga magmatic event. The continental crust underwent low-pressure granulite-facies metamorphism at -380 Ma ago, whereas the cordierite granite magmas was generated and emplaced during 380 Ma, followed by intrusion of the massive monzonitic leuco-granite vein at circa 370-330 Ma. These data suggest that after the final closure of Proto-Tethys Ocean spreading along the southern Qaidam Block at -420 Ma, break-off of the subducted slab or delamination of the lower crustal base and upwelling of the asthenospheric mantle beneath the southern Qaidam Block occurred before the Mid-Devonian, and that the initiation of the Paleo-Tethys tectonics might initiate near the end of Early-Carboniferous in the East Kunlun-Qaidam region, East Asia.
基金financially supported by grants from the National Natural Science Foundation of China (No.41472051) to J.Wanga grant from the Natural Science and Engineering Research Council of Canada to K.Hattori+1 种基金supported by grants from the China Geological Survey (Nos.1212011121088 12120114044401)
文摘High-Al chromite from the Kudi chromitites contains a wide range of mineral inclusions. They include clinopyroxene, amphibole, phlogopite, olivine, orthopyroxene, apatite, base-metal sulfides, calcite and brucite. The modal abundance of inclusions vary greatly among different grains of chromite. The common inclusions are clinopyroxene and amphibole, which occur as monomineral or polymineral associated with other minerals. The shapes of these inclusions tend to follow the growth plane of host chromite. Mineral assemblages and textures demonstrate that some inclusions（olivine, clinopyroxene） are trapped during magmatic stage, and most of the inclusions（e.g., amphibole, phlogopite） are trapped during recrystallization of chromite. Sulfide inclusions are pentlandite, chalcopyrite and cubanite. They occur either as isolated grains or together with silicate minerals, and formed from the separation of sulfide-bearing liquid from silicate magma. The parental magma of chromitites contains Al2O3 15.0wt%–16.5wt%, TiO20.30wt%–1.05wt% based on calculation with the composition of chromite, similar to parental magma of high-Al chromitites from elsewhere and the estimated melt composition is comparable with that of MORB. Considering the high-Mg olivine in disseminated chromitite and abundant hydrous inclusions, we propose that Kudi chromitites formed beneath a volcanic front during the subduction initiation of Proto-Tethys.
文摘PROTOS 2C卷烟机通过压缩空气向胶水桶内加压以保证连续不断向喷胶嘴供胶,但容易出现胶水桶内表层胶水产生胶皮和凝结成块,堵塞胶水管路及喷嘴的情况,针对这个问题,我们在继续使用原有压缩空气系统的情况下,在桶盖上原有安全阀位置处安装快插气管接头,接入或门型梭阀,使得压缩空气不向外界排出,不带走胶水水分,问题得到解决。目前已应用于卷包一车间10台PROTOS 2C卷接机组,应用效果良好。The PROTOS 2C cigarette machine pressurizes the glue bucket with compressed air to ensure continuous supply of glue to the spray nozzle. However, it is prone to the occurrence of glue on the surface of the glue bucket forming rubber skin and clumping, blocking the glue pipeline and nozzle. In response to this problem, we have installed a quick insertion air pipe joint at the original safety valve position on the bucket cover while continuing to use the original compressed air system, and connected it to a door type shuttle valve to prevent compressed air from being discharged to the outside and not taking away glue moisture, thus solving the problem. At present, it has been applied to 10 PROTOS 2C winding and splicing units in the first packaging workshop, and the application effect is good.
文摘本论文涉及一种烟草行业卷接设备电气维修工装,适用于PROTOS 2C卷烟机Y1M、Y2M、Y3M剔除阀门的安装与拆卸。该工装由长柄臂、手柄和套筒三部分构成,均采用不锈钢材质。长柄臂直径为10 mm,一端95 mm处沿90度折弯处理,并与直径为15 mm、长度为30 mm的不锈钢套筒焊接连接。套筒通孔端面设计为8 × 6 mm的方孔,并在此基础上,以方孔长边为弦,中心为圆心,设计半径为5 mm的圆。该工装能够实现剔除阀门的快速、精准安装与拆卸,具有结构简单、操作便捷、调整精确和适用范围广泛等优点。This paper relates to an electrical maintenance tool for tobacco industry winding equipment, which is suitable for the installation and disassembly of PROTOS 2C cigarette machine Y1M, Y2M, Y3M eliminator valves. The tool is composed of three parts: a long handle arm, a handle and a sleeve, all of which are made of stainless steel. The long handle arm has a diameter of 10mm, one end of 95 mm is bent along 90 degrees, and is welded with a stainless steel sleeve with a diameter of 15 mm and a length of 30 mm. The end face of the sleeve through hole is designed as a square hole of 8 × 6 mm, and on this basis, the long side of the square hole is the string, the center is the center of the circle, and the design radius is 5 mm. The tool can realize the fast and accurate installation and disassembly of the culling valve, and has the advantages of simple structure, convenient operation, accurate adjustment and wide application range.
