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DOI10.1016/j.palaeo.2019.109393
Lower Triassic carbonate δ238U record demonstrates expanded oceanic anoxia during Smithian Thermal Maximum and improved ventilation during Smithian-Spathian boundary cooling event
Zhao H.; Algeo T.J.; Liu Y.; Chen Z.-Q.; Zhang L.; Hu Z.; Li Z.
发表日期2020
ISSN0031-0182
卷号539
英文摘要The Smithian-Spathian boundary (SSB) transition was recently identified as a major biocrisis on the road to marine ecosystem recovery following the end-Permian mass extinction. Marine anoxia is hypothesized to have played an important role in the SSB biocrisis. However, an understanding of the relationship of this biocrisis to contemporaneous marine redox conditions has been hampered by limited knowledge of the timing, duration, and extent of anoxia during the Smithian-Spathian (S-S) transition. Here, we present a high-resolution carbonate U-isotope record from the Jiarong section of South China that spans the mid-Smithian to mid-Spathian interval. This record shows persistent negativeδ238U values (averaging −0.56‰) in the late Smithian, followed by a rapid positive shift (from −0.78‰ to −0.10‰) across the SSB, and then a more gradual shift back to lower δ238U values in the early to mid-Spathian. U isotope mass balance modeling suggests that the global area of anoxic seafloor expanded strongly during the late Smithian and the early to mid-Spathian but contracted sharply during the S-S transition. This redox pattern shows an excellent correspondence to previously published tropical sea-surface temperature (SST) records, with peak oceanic anoxia coinciding with the Smithian Thermal Maximum (STM) and diminished anoxia during a pronounced global cooling event at the SSB. Although paleontological records commonly do not distinguish between terminations during the late Smithian and SSB, we hypothesize that the SSB biocrisis, which was marked by sharp diversity losses among conodonts, ammonoids, and other marine invertebrates, was primarily associated with the STM, in which case oceanic anoxia is likely to have been a major stressor of mid-Olenekian marine biotas. © 2019 Elsevier B.V.
英文关键词Early Triassic; Hyperthermal; Jiarong; Marine anoxia; Olenekian; U isotopes
语种英语
scopus关键词carbonate; isotopic composition; marine ecosystem; mass balance; mass extinction; redox conditions; sea surface temperature; Triassic; uranium isotope; China; Ammonoidea; Invertebrata
来源期刊Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/150636
作者单位State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China; Department of Geology, University of Cincinnati, Cincinnati, OH, 45221-0013, United States
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Zhao H.,Algeo T.J.,Liu Y.,et al. Lower Triassic carbonate δ238U record demonstrates expanded oceanic anoxia during Smithian Thermal Maximum and improved ventilation during Smithian-Spathian boundary cooling event[J],2020,539.
APA Zhao H..,Algeo T.J..,Liu Y..,Chen Z.-Q..,Zhang L..,...&Li Z..(2020).Lower Triassic carbonate δ238U record demonstrates expanded oceanic anoxia during Smithian Thermal Maximum and improved ventilation during Smithian-Spathian boundary cooling event.Palaeogeography, Palaeoclimatology, Palaeoecology,539.
MLA Zhao H.,et al."Lower Triassic carbonate δ238U record demonstrates expanded oceanic anoxia during Smithian Thermal Maximum and improved ventilation during Smithian-Spathian boundary cooling event".Palaeogeography, Palaeoclimatology, Palaeoecology 539(2020).
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