The Raohe area of Heilongjiang Province,Northeast China belongs to the Nadanhada Terrane,which was in low latitudes of Panthalassa during the Triassic.The composition of the Late Triassic conodont fauna,derived from l...The Raohe area of Heilongjiang Province,Northeast China belongs to the Nadanhada Terrane,which was in low latitudes of Panthalassa during the Triassic.The composition of the Late Triassic conodont fauna,derived from limestone lenses interpreted to formed on seamounts,provides important new information on the pelagic biota in this ocean.New conodont samples collected from sections at Minzhu,Minnan and Chigangbei sections belong to three Norian conodont zones.In ascending order,they are:Mockina postera Zone,Mockina bidentata Zone and Parvigondolella andrusovi Zone.The Norian conodont fauna in the Raohe area has distinct attributes:there are a lot of cosmopolitan species(e.g.,Mockina postera,Mockina bidentata,Parvigondolella andrusovi)which enable good global correlation;endemic conodont species are also present(e.g.,Mockina sakurae,Mockina shamiseni,Norigondolella nadanhadaensis)indicating that Panthalassa Ocean conodont populations also contained unique taxa;and some conodonts belong to taxa with much shorter ranges in surrounding epeiric seas(e.g.,Carnepigondolella pseudoechinata,Neocavitella cavitata and Epigondolella vialovi).The presence of the latter“relicts”indicates that the seamounts were persistently suitable habitats for many millions of years in the Late Triassic.展开更多
The widespread microbialites deposition that followed the End-Permian mass extinction in the Tethyan realm have been intensively studied because of the evidence they provide on the nature of this crisis and its afterm...The widespread microbialites deposition that followed the End-Permian mass extinction in the Tethyan realm have been intensively studied because of the evidence they provide on the nature of this crisis and its aftermath. However, the age of the microbialite event remains controversial. New conodont collection across the Permian–Triassic（P–T） transition from Dajiang（Guizhou Province, South China） in this study enable us to discriminate four conodont zones, in ascending order, they are： Hindeodus parvus zone, Isarcicella lobata zone, Isarcicella isarcica zone and Hindeodus sosioensis zone. The age of microbialite in the P–T transition at the Dajiang Section is considered to be within the Hindeodus parvus zone and thus to clearly post-date the main extinction crisis. Reviewing the age of onset of microbialites throughout the Tethyan regions reveals two different ages： a Hindeodus changxingensis zone age is dominant in south-western and westernmost Tethys, whilst most other regions show microbialite deposition began in the Hindeodus parvus zone. Our investigation also indicates that two conodont changes occur at this time： an increase of hindeodid species immediately following a sequence boundary and the mass extinction, and a phase of extinction losses in the earliest Triassic Isarcicella isarcica zone during highstand development.展开更多
The Triassic ＂Green-bean Rock＂ （GBR） layers were widely recognized around the Early-Middle Triassic boundary interval in the Nanpanjiang Basin, South China. To determine the precise relationship between the GBR la...The Triassic ＂Green-bean Rock＂ （GBR） layers were widely recognized around the Early-Middle Triassic boundary interval in the Nanpanjiang Basin, South China. To determine the precise relationship between the GBR layers and the first appearance datum （FAD） of the conodont Chiosella timorensis, four Lower-Middle Triassic sections from the Nanpanjiang Basin, including the Gaimao, Bianyang lI, Zuodeng and Wantou sections have been studied in detail. Detailed conodont biostratigraphy convinces us that there is no exact temporal relationship between the GBR layers and first occurrence of Ch. timorensis. Moreover, the numbers of the GBR layers are different from the place to place within the Nanpanjiang Basin, and the time span of the GBR layers was much longer than previously estimated. Global correlations show that the FAD of Ch. timorensis is contemporaneous basinwide and worldwide and more suitable marker defining the Olenekian-Anisian boundary （Early-Middle Triassic boundary） than any other proxies.展开更多
Deep-water facies sections have advantages of recording complete information across the Permian-Triassic boundary(PTB). Here we present a detailed study on the conodont biostratigraphy and carbon isotope profile range...Deep-water facies sections have advantages of recording complete information across the Permian-Triassic boundary(PTB). Here we present a detailed study on the conodont biostratigraphy and carbon isotope profile ranges from the Wuchiapingian-Changhsingian boundary(WCB) to the PTB of two deep-water facies sections at Zhuqiao and Shiligou in the Middle Yangtze region, western Hubei, South China. Fifteen species and three genera are identified. Eight conodont zones are recognized which in ascending order are the Clarkina orientalis, C. wangi, C. subcarinata, C. changxingensis, C. yini, C. meishanensis, Hindeodus parvus and Isarcicella isarcica zones. The onset of deposition of the deep-water siliceous strata of Dalong Formation in western Hubei began in the Late Wuchiapingian and persisted to the Late Changhsingian. Carbon isotope negative excursions occur near both the WCB and PTB in both sections. The WCB δ13 Ccarb negative excursion is in the C. orientalis and C. wangi zones. The PTB δ13 Ccarb negative excursion began in the C. yini Zone and extended to the I. isarcica Zone. The absence of several Changhsingian zones may indicate the difficulty of extracting conodonts from siliceous strata or the presence of an intra-Changhsingian hiatus.展开更多
Focusing on the Shuixiakou Section(Xikou area,Zhen’an County,Shaanxi Province,southeastern Qinling region,China),the Roadian-Wordian conodonts are investigated.More than 2000 conodont elements including 6 genera and ...Focusing on the Shuixiakou Section(Xikou area,Zhen’an County,Shaanxi Province,southeastern Qinling region,China),the Roadian-Wordian conodonts are investigated.More than 2000 conodont elements including 6 genera and 14 species have been obtained.Based on these materials,the Guadalupian Jinogondolella nankingensis and J.aserrata zones have been recognized.The Roadian-Wordian boundary is tentatively defined by the first occurrence of J.aserrata in the lower part of UnitⅢin the Shuixiakou Formation.The sedimentary succession of Xikou area records similar sea-level changes to those observed in Laibin area(South China).The 40 m-thick bioclastic limestone of UnitⅣin this section can be correlated with the reefs of Bed 114 in Laibin area.A temperature drop indicated byδ18Oapatite values suggests this Wordian interval coincides with a period of glaciation and global regression.展开更多
Based on a study of 49 conodont and 57 geochemical samples from the Upper Triassic,carbonate-dominated Dengdengqiao Formation,Qinling Basin,China,the Carnian conodonts and carbon isotope records are first reported.Two...Based on a study of 49 conodont and 57 geochemical samples from the Upper Triassic,carbonate-dominated Dengdengqiao Formation,Qinling Basin,China,the Carnian conodonts and carbon isotope records are first reported.Two genera and four species have been identified amongst 87 conodont elements:Mosherella praebudaensis,Mo.longnanensis sp.nov.,Mo.sp.,and"Misikella"longidentata.The presence of Mo.praebudaensis indicates that the lower part(bed 2)of the formation is attributable to the Julian(lower Carnian)substage.A radiolarian fauna identified in a previous study belongs to the upper Carnian,but the sampling horizon is unclear.Theδ13Ccarb curve shows a~1.8‰negative excursion beginning from upper part of bed 3,but its stratigraphic location is uncertain.The Dengdengqiao Formation is clearly at least partly of Carnian age but could include younger strata.The abundant calcareous algae at the section is probably due to some transport rather than preserved in site.The unusual ecosystem with rare marine organisms may reflect long-term stressful and unfavorable conditions at Dengdengqiao.展开更多
BACKGROUND On October 3,2022,Svante Paabo,a Swedish evolutionary geneticist,was awarded the Nobel Prize in Physiology and Medicine.This breaking news brought paleogenomics,the interdisciplinary field of geology and bi...BACKGROUND On October 3,2022,Svante Paabo,a Swedish evolutionary geneticist,was awarded the Nobel Prize in Physiology and Medicine.This breaking news brought paleogenomics,the interdisciplinary field of geology and biology,to the forefront of public attention.By sequencing the genomes of the extinct Neanderthal and Denisovan,Prof.Paabo and his research team found that ancient gene flow events did happen between these extinct ancient humans and the ancestors of Homo sapiens(Prufer et al.,2017,2014;Fu et al.,2016;Meyer et al.,2012),which paved the way for the academic community for a new understanding of human evolutionary history.展开更多
Dear friends, On behalf of the entire editorial office of Journal of Earth Science （JES）, I am pleased to express my warm good wishes to you all as we say goodbye to the year 2013. It is now history but as we greet ...Dear friends, On behalf of the entire editorial office of Journal of Earth Science （JES）, I am pleased to express my warm good wishes to you all as we say goodbye to the year 2013. It is now history but as we greet the New Year 2014, I would like to recall the achievements to which you have contributed by your continuous support and endeavor.展开更多
基金supported by the National Natural Sciences Foundation of China(Nos.42372005,41830320,41972033)。
文摘The Raohe area of Heilongjiang Province,Northeast China belongs to the Nadanhada Terrane,which was in low latitudes of Panthalassa during the Triassic.The composition of the Late Triassic conodont fauna,derived from limestone lenses interpreted to formed on seamounts,provides important new information on the pelagic biota in this ocean.New conodont samples collected from sections at Minzhu,Minnan and Chigangbei sections belong to three Norian conodont zones.In ascending order,they are:Mockina postera Zone,Mockina bidentata Zone and Parvigondolella andrusovi Zone.The Norian conodont fauna in the Raohe area has distinct attributes:there are a lot of cosmopolitan species(e.g.,Mockina postera,Mockina bidentata,Parvigondolella andrusovi)which enable good global correlation;endemic conodont species are also present(e.g.,Mockina sakurae,Mockina shamiseni,Norigondolella nadanhadaensis)indicating that Panthalassa Ocean conodont populations also contained unique taxa;and some conodonts belong to taxa with much shorter ranges in surrounding epeiric seas(e.g.,Carnepigondolella pseudoechinata,Neocavitella cavitata and Epigondolella vialovi).The presence of the latter“relicts”indicates that the seamounts were persistently suitable habitats for many millions of years in the Late Triassic.
基金supported by the Natural Science Foundation of China (Nos. 41172024, 41272044)the "973" Program (No. 2011CB808800)+2 种基金the "111" Project (No. B08030)the ‘Fundamental Research Funds for the Central Universities,China University of Geosciences (Wuhan)the State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (No. GBL11202)
文摘The widespread microbialites deposition that followed the End-Permian mass extinction in the Tethyan realm have been intensively studied because of the evidence they provide on the nature of this crisis and its aftermath. However, the age of the microbialite event remains controversial. New conodont collection across the Permian–Triassic（P–T） transition from Dajiang（Guizhou Province, South China） in this study enable us to discriminate four conodont zones, in ascending order, they are： Hindeodus parvus zone, Isarcicella lobata zone, Isarcicella isarcica zone and Hindeodus sosioensis zone. The age of microbialite in the P–T transition at the Dajiang Section is considered to be within the Hindeodus parvus zone and thus to clearly post-date the main extinction crisis. Reviewing the age of onset of microbialites throughout the Tethyan regions reveals two different ages： a Hindeodus changxingensis zone age is dominant in south-western and westernmost Tethys, whilst most other regions show microbialite deposition began in the Hindeodus parvus zone. Our investigation also indicates that two conodont changes occur at this time： an increase of hindeodid species immediately following a sequence boundary and the mass extinction, and a phase of extinction losses in the earliest Triassic Isarcicella isarcica zone during highstand development.
基金supported by 973 Program (No. 2011CB808800)the Natural Science Foundation of China (Nos. 41172024, 41272044, 41402005)+2 种基金the "111" project (No. B08030)the ‘Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)the State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (No. GBL11202)
文摘The Triassic ＂Green-bean Rock＂ （GBR） layers were widely recognized around the Early-Middle Triassic boundary interval in the Nanpanjiang Basin, South China. To determine the precise relationship between the GBR layers and the first appearance datum （FAD） of the conodont Chiosella timorensis, four Lower-Middle Triassic sections from the Nanpanjiang Basin, including the Gaimao, Bianyang lI, Zuodeng and Wantou sections have been studied in detail. Detailed conodont biostratigraphy convinces us that there is no exact temporal relationship between the GBR layers and first occurrence of Ch. timorensis. Moreover, the numbers of the GBR layers are different from the place to place within the Nanpanjiang Basin, and the time span of the GBR layers was much longer than previously estimated. Global correlations show that the FAD of Ch. timorensis is contemporaneous basinwide and worldwide and more suitable marker defining the Olenekian-Anisian boundary （Early-Middle Triassic boundary） than any other proxies.
基金supported by the Natural Science Foundation of China(Nos.41572002,41830320,41272044,41472087,4183000426,41802016)
文摘Deep-water facies sections have advantages of recording complete information across the Permian-Triassic boundary(PTB). Here we present a detailed study on the conodont biostratigraphy and carbon isotope profile ranges from the Wuchiapingian-Changhsingian boundary(WCB) to the PTB of two deep-water facies sections at Zhuqiao and Shiligou in the Middle Yangtze region, western Hubei, South China. Fifteen species and three genera are identified. Eight conodont zones are recognized which in ascending order are the Clarkina orientalis, C. wangi, C. subcarinata, C. changxingensis, C. yini, C. meishanensis, Hindeodus parvus and Isarcicella isarcica zones. The onset of deposition of the deep-water siliceous strata of Dalong Formation in western Hubei began in the Late Wuchiapingian and persisted to the Late Changhsingian. Carbon isotope negative excursions occur near both the WCB and PTB in both sections. The WCB δ13 Ccarb negative excursion is in the C. orientalis and C. wangi zones. The PTB δ13 Ccarb negative excursion began in the C. yini Zone and extended to the I. isarcica Zone. The absence of several Changhsingian zones may indicate the difficulty of extracting conodonts from siliceous strata or the presence of an intra-Changhsingian hiatus.
基金supported by the National Natural Science Foundation of China(Nos.41572002,41830320,and 41661134047)。
文摘Focusing on the Shuixiakou Section(Xikou area,Zhen’an County,Shaanxi Province,southeastern Qinling region,China),the Roadian-Wordian conodonts are investigated.More than 2000 conodont elements including 6 genera and 14 species have been obtained.Based on these materials,the Guadalupian Jinogondolella nankingensis and J.aserrata zones have been recognized.The Roadian-Wordian boundary is tentatively defined by the first occurrence of J.aserrata in the lower part of UnitⅢin the Shuixiakou Formation.The sedimentary succession of Xikou area records similar sea-level changes to those observed in Laibin area(South China).The 40 m-thick bioclastic limestone of UnitⅣin this section can be correlated with the reefs of Bed 114 in Laibin area.A temperature drop indicated byδ18Oapatite values suggests this Wordian interval coincides with a period of glaciation and global regression.
基金supported by the National Natural Science Foundation of China(Nos.41830320,45172002,41661134047)。
文摘Based on a study of 49 conodont and 57 geochemical samples from the Upper Triassic,carbonate-dominated Dengdengqiao Formation,Qinling Basin,China,the Carnian conodonts and carbon isotope records are first reported.Two genera and four species have been identified amongst 87 conodont elements:Mosherella praebudaensis,Mo.longnanensis sp.nov.,Mo.sp.,and"Misikella"longidentata.The presence of Mo.praebudaensis indicates that the lower part(bed 2)of the formation is attributable to the Julian(lower Carnian)substage.A radiolarian fauna identified in a previous study belongs to the upper Carnian,but the sampling horizon is unclear.Theδ13Ccarb curve shows a~1.8‰negative excursion beginning from upper part of bed 3,but its stratigraphic location is uncertain.The Dengdengqiao Formation is clearly at least partly of Carnian age but could include younger strata.The abundant calcareous algae at the section is probably due to some transport rather than preserved in site.The unusual ecosystem with rare marine organisms may reflect long-term stressful and unfavorable conditions at Dengdengqiao.
基金supported by the National Natural Science Foundation of China(No.42172027).
文摘BACKGROUND On October 3,2022,Svante Paabo,a Swedish evolutionary geneticist,was awarded the Nobel Prize in Physiology and Medicine.This breaking news brought paleogenomics,the interdisciplinary field of geology and biology,to the forefront of public attention.By sequencing the genomes of the extinct Neanderthal and Denisovan,Prof.Paabo and his research team found that ancient gene flow events did happen between these extinct ancient humans and the ancestors of Homo sapiens(Prufer et al.,2017,2014;Fu et al.,2016;Meyer et al.,2012),which paved the way for the academic community for a new understanding of human evolutionary history.
文摘Dear friends, On behalf of the entire editorial office of Journal of Earth Science （JES）, I am pleased to express my warm good wishes to you all as we say goodbye to the year 2013. It is now history but as we greet the New Year 2014, I would like to recall the achievements to which you have contributed by your continuous support and endeavor.
