globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.03.038
论文题名:
High amplitude redox changes in the late Early Triassic of South China and the Smithian-Spathian extinction
作者: Sun Y.D.; Wignall P.B.; Joachimski M.M.; Bond D.P.G.; Grasby S.E.; Sun S.; Yan C.B.; Wang L.N.; Chen Y.L.; Lai X.L.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 427
起始页码: 62
结束页码: 78
语种: 英语
英文关键词: Carbon isotopes ; Early Triassic ; Redox changes ; Smithian-Spathian extinction
英文摘要: The Early Triassic was a time of remarkably high temperatures, large carbon cycle perturbations and episodes of widespread ocean anoxia. The sediments in the Nanpanjiang Basin of South China provide superb opportunities to examine the sedimentary response to these extreme conditions especially during the crisis interval at the Smithian-Spathian (S-S) boundary. We have investigated a deep water section at Jiarong and a shallower water section at Mingtang. These contain a range of facies including black shales, micritic limestone units and rudaceous carbonate event beds that include flat pebble conglomerates and breccia debrites that bear similarities to the hybrid event beds seen in clastic turbidite successions.Redox proxies (pyrite framboids and trace metals) reveal that widespread anoxia in the late Smithian persisted into the Novispathodus pingdingshanensis Zone of the early Spathian before a sharp transition to highly oxygenated "griotte facies" (red marine strata) in the Icriospathodus collinsoni Zone that records an "oxic rebound". Benthic faunas are locally common but of low diversity and dominated by thin-shelled bivalves and ostracodes with small foraminifers and exceptionally rare fish remains. Bioturbation was intense only in the early-middle Spathian (I. collinsoni conodont zone) Griotte facies. Anoxia and extremely high temperatures probably played a role in severely restricting the abundance of fish and the small sizes of marine invertebrates at this time. The presence of ooids and seafloor fan cements in our study sections indicates highly saturated conditions rather than acidification at the end of the Smithian. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68947
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作者单位: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan, China; GeoZentrum Nordbayern, Universität Erlangen-Nürnberg, Schlossgarten 5, Erlangen, Germany; School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Department of Geography, Environment and Earth Sciences, University of Hull, Hull, United Kingdom; Geological Survey of Canada, 3303 33rd Street N.W., Calgary, AB, Canada; Department of Geoscience, University of Calgary, 2500 University Dr. N.W., Calgary, AB, Canada; Department of Earth Sciences, University of Hong Kong, Pokfulam Road, Hong Kong; Wuhan Center of Geological Survey, Guanggu Road 69, Wuhan, China; Institute of Earth Sciences, University of Graz, Heinrichstrasse 26, Graz, Austria

Recommended Citation:
Sun Y.D.,Wignall P.B.,Joachimski M.M.,et al. High amplitude redox changes in the late Early Triassic of South China and the Smithian-Spathian extinction[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,427
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