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Devonian-Carboniferous Pillow OIB-Type Basalts in the Youjiang Basin,SW China:Implications for the Eastern Extension of the paleo-tethys Branch ocean

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Journal of Earth Science 2023年第3期34卷 690-705页

作者： Jie Yang Yuansheng Du Hu Huang Jianghai Yang Hongwei Huang Zhiqiang Huang Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection School of Resources and EnvironmentLinyi UniversityLinyi 276000China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation Institute of Sedimentary GeologyChengdu University of TechnologyChengdu 610059China General Academy of Geological Survey of Guangxi Nanning 530023China

Late paleozoic pillow basalts are well preserved in the Youjiang Basin of SW *** this study,we conducted geochemical and Sr-Nd isotopic study on the Late Devonian and Late Carboniferous basalts in Napo area,Youjiang *** analyzed samples comprise moderate SiO2,TiO2,Mg#,and REE contents,with slightly positive or negative Eu anomalies,similar to the chemical nature of OIB(oceanic island basalt).All basalts show low(^(143)Nd/^(144)Nd)iand(^(87)Sr/^(86)Sr)ivalues,close to EMI-type(I-type Enriched Mantle)magma *** Carboniferous basalts display higher(^(87)Sr/^(86)Sr)i,Nb/Th,and lowerε_(Nd)(t),Zr/Nb values than those of the Late Devonian basalts,implying progressively decreased enrichment components in the magma source *** evolution trend reflects a continuous lithospheric thinning event,supporting a progressive rifting setting of the Youjiang Basin along the southwestern margin of the Yangtze Block in Late *** with regional geological background,the Youjiang Basin is viewed as a continental rift basin related to the opening of the paleo-tethys ocean in Late Devonian and became a passive continental margin basin in *** paleo-tethys branch ocean probably extended further to the southern Youjiang Basin,likely corresponding to the Song Ma suture zone.

关键词： basalts Late paleozoic paleo-tethys ocean Youjiang Basin geochemistry

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Devonian integrative stratigraphy,biotas,and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

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Science China Earth Sciences 2024年第4期67卷 1036-1070页

作者： Wenkun QIE Kun LIANG Wen GUO Biao GAO Junjun SONG Bo CHEN Pu HUANG Li QIAO Honghe XU Jitao CHEN Yucong SUN Yichun ZHANG State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Nanjing 211135China

The Devonian System in the Qinghai-Tibetan Plateau and its surrounding areas is widely distributed,diverse in lithotypes and rich in *** records the crucial processes of continuous subduction and reduction of the paleo-Asian ocean in the northern hemisphere and the transformation of the Proto-tethys ocean into the paleo-tethys ocean in the southern ***,it is of great significance for explaining the global paleogeographic evolution,tectonic activities and biodiversity changes during this critical *** blocks on both sides of the southern Tienshan suture zone and the Longmu Co-ShuanghuChangning-Menglian suture zone belong to different sedimentary systems and paleobiogeographic realms and regions,showing important tectonic paleogeographic partitioning *** two suture zones represent the main branches of the paleoAsian ocean and the paleo-tethys ocean,respectively,and on this basis the Devonian System can be subdivided into three types:the Tienshan type,the tethys type and the Gondwana *** on recent research progress on the Devonian stratigraphy and paleontology in combining provenance analysis and biotic characteristics in the Qinghai-Tibetan Plateau and surrounding areas,this paper aims to establish the latest integrative stratigraphic framework and conduct paleogeographic reconstruction,providing foundation for exploring the geological evolution and dynamic mechanisms of various terranes and blocks in the northern margin of *** results indicate that the North Qiangtang,South Qiangtang,Simao,Baoshan and Tengchong terranes,as well as the Himalaya tethys Zone and the South China Block have affinities with the Indian Block,while the Lhasa Terrane has affinities with the Australian Block,and may be located between the South China and Australian *** the Emsian(Early Devonian),the South China Block separated from the northern margin of Gondwana,a process that was accompanied by the opening of the Jinshajiang-Ailaosh

关键词： Devonian paleo-tethys ocean Integrative stratigraphy Biotas Provenance Analysis paleogeography

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First Record of Petalodus Owen,1840(Chondrichthyes,Petalodontidae)in the Lower Permian(Cisuralian)of China

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Acta Geologica Sinica(English Edition) 2021年第4期95卷 1057-1064页

作者： GAI Zhikun BAI Zhijun LIN Xianghong MENG Xinyuan ZHANG Junwen Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China CAS Center for Excellence in Life and paleoenvironment Beijing 100044China University of Chinese Academy of Sciences Beijing 100039China Planning and Natural Resources Bureau of Yangquan YangquanShanxi 045000China Second Institute of Geological and Engineering Exploration of Shanxi YangquanShanxi 045000China

The Petalodontiformes are a small intriguing group of Permo–Carboniferous *** is the longest known petalodont genus generally considered representative of the *** first definite fossil record of seven well-preserved Petalodus teeth has been found in the Qianshi limestone in the Lower Permian(Cisuralian)middle–upper Taiyuan Formation in Yangquan City,Shanxi Province,North *** specimens are characterized by petal-shaped teeth with a spade-like crown,and a long,tongue-shaped root;the crown is circled with a band or cingulum composed of imbricated ridges at the *** seven teeth are assigned to the species *** because of their vertically narrow cingulum and much longer *** is a worldwide genus,with fossil localities mainly concentrated in the Laurussia *** occurrence of Petalodus teeth in Yangquan not only is the first fossil record in China,but also only the second record in *** Yangquan fossil site was part of the paleoequatorial North China Craton during the Early Permian,and was isolated from Laurusia and East Gondwana by the paleo-tethys *** successful dispersal of Petalodus from Laurusia to the North China Block along paleo-tethys may support the possibility that Petalodus taxa were active free-swimmers rather than bottom *** new finding increases the petalodont diversity in eastern Asia,and also sheds new light on the distribution and stratigraphic range.

关键词： vertebrate paleontology Petalodus Petalodontiformes Yangquan Taiyuan Formation paleo-tethys ocean Asselian–Sakmarian Shanxi Province

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