The Upper Carboniferous Zhanjin Formation has attracted much attention from geoscientists for containing glacial–marine diamictite and cold-water fauna typified by the bivalve Eurydesma.The presence of this Formation...The Upper Carboniferous Zhanjin Formation has attracted much attention from geoscientists for containing glacial–marine diamictite and cold-water fauna typified by the bivalve Eurydesma.The presence of this Formation has provided important evidence for determining the northern border of Gondwana.Previous researchers have classified those strata north of Niangrong Co in the Gêrzê region as part of the Zhanjin Formation based on the presence of glacial–marine diamictite, although the absence of biological fossil evidence has defied clear age determination.Our field investigations first discovered large quantities of corals, sponges and bryozoans.All coral fossils were identified as belonging to the Hexacorallia subclass including 13 genera and 25 species, primarily including Conophyllia guiyangensis Deng et Kong, Coryphyllia regularis Cuif, Cuifia columnaris Roniewicz, Distichophyllia norica Frech, Distichophyllia gigas Vinassa de Regny, Pamiroseris rectilamellosa Winkler, Retiophyllia clathrata Emmrich, and Retiophyllia paraclathrata Roniewicz.Extensive biostratigraphic correlations show that the hexacorallia should belong to the Late Triassic, thereby negating the presence of the Zhanjin Formation in the study area.Based on analyses of sedimentary facies and detailed study of the glacial–marine diamictite as supposed by earlier researchers, the limestone blocks and gravels within the facies are slope facies olistostromes and waterway sediments from lime slurry debris flows in the submarine fan rather than primary sedimentary products.Among them, lenticular sandstone should be sequentially distributed waterway sand bodies, indicating that the strata have no glacial–marine diamictite.In addition, the rocks containing the mentioned fossils are just limestone blocks from olistostromes, and limestone gravels from waterways of submarine fans.Such a result further negates the presence of the Zhanjin Formation in the study area, and indicates that the age of the studied strata should be youner than the Late Triassic.Through regional stratigraphic comparisons and the study of tectonic settings of the strata, the sedimentary characteristics of the subject strata, including lithology, lithofacies and fossils, are confirmed to be similar to the widely distributed Sêwa Formation in this region.We thus infer that the strata belong to the Middle–Lower Jurassic Sêwa Formation.This finding is important for both studying paleogeography of Tibet and determining the northern boundary of Gondwana.展开更多
After the middle of the Ming Dynasty,along with the rapid social changes,the ideological trend of practical studies guided by the reflection and criticism of the Cheng-Zhu Neo-Confucianism of“putting books on the she...After the middle of the Ming Dynasty,along with the rapid social changes,the ideological trend of practical studies guided by the reflection and criticism of the Cheng-Zhu Neo-Confucianism of“putting books on the shelf and not reading,exploring and studying without foundation”profoundly,widely,and comprehensively,affected every aspect of literary life.Influenced by this,selecting ancient proses in the Tianqi and Chongzhen periods developed new characteristics in three aspects:the purpose of selecting,the preferences of selecting,and the path of evaluating.As far as the purpose of selection is concerned,there is a new trend that the ancient writers of Tianqi and Chongzhen take the enlightenment and the world as the purpose of selection,and are no longer confined to the stereotypes of selecting articles for articles and selecting articles for their emotions.A large number of articles reflecting the economy and people’s livelihood,military affairs,and politics have been included in the anthology horizon of the anthology,thus expanding the selection types of ancient Chinese anthology.From the point of view of comments,the comments of Tianqi and Chongzhen ancient prose appear to be“especially today”.The merit of the ancient prose of management and government and the application of the world can replace the layout of the text,words,and rhetoric,and become the value of the selection of home evaluation.展开更多
基金funded by a research project by the China Geological Survey on the structural properties, deformation, and metamorphism of the substrate for the Mesozoic and Cenozoic basin in Qiangtang, Tibet (No.1212011221115)a survey project by the China Geological Survey on the Rena Co area, Tibet at a scale of 1:50,000 (No.1212011121244)
文摘The Upper Carboniferous Zhanjin Formation has attracted much attention from geoscientists for containing glacial–marine diamictite and cold-water fauna typified by the bivalve Eurydesma.The presence of this Formation has provided important evidence for determining the northern border of Gondwana.Previous researchers have classified those strata north of Niangrong Co in the Gêrzê region as part of the Zhanjin Formation based on the presence of glacial–marine diamictite, although the absence of biological fossil evidence has defied clear age determination.Our field investigations first discovered large quantities of corals, sponges and bryozoans.All coral fossils were identified as belonging to the Hexacorallia subclass including 13 genera and 25 species, primarily including Conophyllia guiyangensis Deng et Kong, Coryphyllia regularis Cuif, Cuifia columnaris Roniewicz, Distichophyllia norica Frech, Distichophyllia gigas Vinassa de Regny, Pamiroseris rectilamellosa Winkler, Retiophyllia clathrata Emmrich, and Retiophyllia paraclathrata Roniewicz.Extensive biostratigraphic correlations show that the hexacorallia should belong to the Late Triassic, thereby negating the presence of the Zhanjin Formation in the study area.Based on analyses of sedimentary facies and detailed study of the glacial–marine diamictite as supposed by earlier researchers, the limestone blocks and gravels within the facies are slope facies olistostromes and waterway sediments from lime slurry debris flows in the submarine fan rather than primary sedimentary products.Among them, lenticular sandstone should be sequentially distributed waterway sand bodies, indicating that the strata have no glacial–marine diamictite.In addition, the rocks containing the mentioned fossils are just limestone blocks from olistostromes, and limestone gravels from waterways of submarine fans.Such a result further negates the presence of the Zhanjin Formation in the study area, and indicates that the age of the studied strata should be youner than the Late Triassic.Through regional stratigraphic comparisons and the study of tectonic settings of the strata, the sedimentary characteristics of the subject strata, including lithology, lithofacies and fossils, are confirmed to be similar to the widely distributed Sêwa Formation in this region.We thus infer that the strata belong to the Middle–Lower Jurassic Sêwa Formation.This finding is important for both studying paleogeography of Tibet and determining the northern boundary of Gondwana.
基金supported by the Postdoctoral Fellowship Program of CPSF under Grant Number GZC20230877The 2023 Youth Teachers’Scientific Research Cultivation Fund Project of South China Normal University“Collation and Research of Ancient Prose Comments in Late Ming Dynasty”(23SK15).
文摘After the middle of the Ming Dynasty,along with the rapid social changes,the ideological trend of practical studies guided by the reflection and criticism of the Cheng-Zhu Neo-Confucianism of“putting books on the shelf and not reading,exploring and studying without foundation”profoundly,widely,and comprehensively,affected every aspect of literary life.Influenced by this,selecting ancient proses in the Tianqi and Chongzhen periods developed new characteristics in three aspects:the purpose of selecting,the preferences of selecting,and the path of evaluating.As far as the purpose of selection is concerned,there is a new trend that the ancient writers of Tianqi and Chongzhen take the enlightenment and the world as the purpose of selection,and are no longer confined to the stereotypes of selecting articles for articles and selecting articles for their emotions.A large number of articles reflecting the economy and people’s livelihood,military affairs,and politics have been included in the anthology horizon of the anthology,thus expanding the selection types of ancient Chinese anthology.From the point of view of comments,the comments of Tianqi and Chongzhen ancient prose appear to be“especially today”.The merit of the ancient prose of management and government and the application of the world can replace the layout of the text,words,and rhetoric,and become the value of the selection of home evaluation.
