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Intensive ocean anoxia and large d(13)C(carb )perturbations during the Carnian Humid Episode (Late Triassic) in Southwest China
Zhang, Z. T.1,2,3; Joachimski, M. M.4; Grasby, S. E.5; Sun, Y. D.2,4
2022-10-01
发表期刊GLOBAL AND PLANETARY CHANGE
ISSN0921-8181
卷号217页码:11
摘要

The Carnian Humid Episode (CHE) represents a dramatic dry to wet climate transition in the Late Triassic. Manifestations of this climate shift and its associated biological and environmental responses are not fully understood. Here, we carried out carbonate carbon isotope, trace metal, and pyrite framboid analyses at Wolonggang in southwest China to trace palaeoenvironmental changes during this critical interval. The CHE at Wolonggang is marked by the development of fine laminated carbonaceous siltstones and black shales overlying the intensely bioturbated Zhuganpo limestone deposited in the latest Julian 1. This lithological change is accompanied by two negative delta C-13(carb) excursions, a strong enrichment of redox-sensitive trace metals U and Mo, and the development of abundant small pyrite framboids with an average diameter < 5 mu m. The sedimentary and geochemical evidence collectively suggest a sharp decrease in carbonate production and a major carbon cycle disturbance, coinciding with the onset of intense ocean anoxia and the mass mortality of burrowing faunas. Unlike other areas in the western Tethys, the aftermath of the CHE at Wolonggang is characterized by longlasting ocean anoxia, with weak carbonate production persisting at least to the late Tuvalian. This is evidenced by the deposition of finely laminated silty carbonates, marls, and carbonaceous siltstones with rare benthic fossils in the Wayao Formation. Our study suggests that anoxic-euxinic environments widely developed along the southwest margins of the Yangtze Platform and in the Nanpanjiang Basin, probably contributing to the loss of marine faunas during the CHE.

关键词Ocean anoxia Pyrite framboid Carbonate carbon isotope Carnian Humid Episode South China
DOI10.1016/j.gloplacha.2022.103942
收录类别SCI
语种英语
关键词[WOS]CARBON-ISOTOPE RECORDS ; PLUVIAL EPISODE ; GUIZHOU PROVINCE ; WESTERN TETHYS ; YANGTZE BLOCK ; EVENT ; DELTA-C-13 ; DIVERSITY ; PYRITE ; PERTURBATIONS
资助项目Natural Science Foundation of China[41830320] ; Natural Science Foundation of China[41821001] ; Natural Science Foundation of China[42272022] ; German Science Foundation Research Unit TERSANE[Jo 219/15] ; China Postdoctoral Science Foundation[2018M642947] ; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS)[203123]
WOS研究方向Physical Geography ; Geology
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号WOS:000864457300003
项目资助者Natural Science Foundation of China ; German Science Foundation Research Unit TERSANE ; China Postdoctoral Science Foundation ; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS)
出版者ELSEVIER
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/41287
专题中国科学院南京地质古生物研究所
通讯作者Sun, Y. D.
作者单位1.China Geol Survey, Wuhan Ctr, Wuhan 430205, Peoples R China
2.China Univ Geosci Wuhan, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
4.Friedrich Alexander Univ Erlangen Nurnberg FAU, Geozent Nordbayern, Schlossgarten 5, D-91054 Erlangen, Germany
5.Geol Survey Canada, 3303 33rd St NW, Calgary, AB T2L 2A7, Canada
第一作者单位中国科学院南京地质古生物研究所
推荐引用方式
GB/T 7714
Zhang, Z. T.,Joachimski, M. M.,Grasby, S. E.,et al. Intensive ocean anoxia and large d(13)C(carb )perturbations during the Carnian Humid Episode (Late Triassic) in Southwest China[J]. GLOBAL AND PLANETARY CHANGE,2022,217:11.
APA Zhang, Z. T.,Joachimski, M. M.,Grasby, S. E.,&Sun, Y. D..(2022).Intensive ocean anoxia and large d(13)C(carb )perturbations during the Carnian Humid Episode (Late Triassic) in Southwest China.GLOBAL AND PLANETARY CHANGE,217,11.
MLA Zhang, Z. T.,et al."Intensive ocean anoxia and large d(13)C(carb )perturbations during the Carnian Humid Episode (Late Triassic) in Southwest China".GLOBAL AND PLANETARY CHANGE 217(2022):11.
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