首页|The Early-Middle Triassic Supervolcano in the Yangtze Block,South China and associated obstacles to biotic recovery

The Early-Middle Triassic Supervolcano in the Yangtze Block,South China and associated obstacles to biotic recovery

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The end-Permian mass extinction was one of the major global crises spanning the entire Early Triassic or longer.Eruptions of volcanos were one of the factors that delayed the biotic recovery after this event.Supervolcano eruptions can cause catastrophic effects on global environment,climate,and life.Here we investigate the tuff layers from Early-Middle Triassic boundary in the Yangtze Block and identify a supervolcano eruption event.The zircon U-Pb ages of the section-Langdai,section-Daijiagou and sec-tion-Longmendong tuff samples are 247.1±1.9 Ma,247.6±2.0 Ma and 247.7±1.7 Ma,respectively.These ages mark the Olenekian-Anisian boundary.The zircon grains from the tuff layers have negativeεHf(t)(-15.3 to-0.8),two-stage Hf model(TDM2)ages(1.7 to 2.2 Ga)and display high-δ18O values(mostly＞10‰).Clay minerals and quartz dominate the rock composition.The whole rock compositions show that the tuff layers were derived from magma of intermediate to felsic composition,which formed by the remelting of Paleoproterozoic materials of continental crust.The volcanic eruption site is located in the Jinshajiang-Ailaoshan-Song Ma suture zone in the southwestern margin of the Yangtze Block.A combination of the closure of the Paleo-Tethys Ocean Basin and the collision of the Indochina Block and South China contributed to the eruption,which was a supervolcano eruption under the active con-tinental margin arc settings.We speculate that this supervolcano eruption might have contributed to the delayed biotic recovery after the end-Permian mass extinction.

Early-Middle TriassicTuff layerSupervolcanoYangtze BlockBiotic recovery

Haifeng Chen、Hao Zou、M.Santosh、Huawen Cao、Franco Pirajno、Changcheng Huang、Mingcai Hou

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State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China

College of Earth Science,Chengdu University of Technology,Chengdu,Sichuan 610059,China

School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China

Department of Earth Science,University of Adelaide,Adelaide,SA 5005,Australia

Yonsei Frontier Lab,Yonsei University,Seoul,South Korea

Centre of Exploration Targeting,The University of Western Australia,35 Stirling Highway,Crawley,WA 6009,Australia

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国家自然科学基金Outstanding Youth Science Fund Project of Sichuan Province,ChinaDepartment of Natural Resources of Sichuan Province,ChinaEverest Scientific Research Program of Chengdu University of Technology

4227212923NSFJQ0162KJ-2023-011

2024

10.1016/j.gsf.2023.101694

地学前缘(英文版)
中国地质大学（北京） 北京大学

地学前缘(英文版)

CSTPCD
影响因子：0.576
ISSN：1674-9871
年,卷(期)：2024.15(1)
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