globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.01.039
论文题名:
Tracking the redox history and nitrogen cycle in the pelagic Panthalassic deep ocean in the Middle Triassic to Early Jurassic: Insights from redox-sensitive elements and nitrogen isotopes
作者: Fujisaki W.; Sawaki Y.; Yamamoto S.; Sato T.; Nishizawa M.; Windley B.F.; Maruyama S.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 449
起始页码: 397
结束页码: 420
语种: 英语
英文关键词: Japan ; Mass extinction ; Oceanic anoxic event ; Sediment geochemistry ; Shales
英文摘要: In order to clarify the redox history of the central Panthalassic Ocean in the Middle Triassic (Anisian) to Early Jurassic (Toarcian), we determined the abundances of major, trace and rare earth elements, and organic carbon and total nitrogen isotopes from well-exposed shales interbedded with deep-sea cherts from Inuyama, southwest Japan. A distinct positive Ce anomaly accompanying high Mn and weak Mo enrichments was detected in the transitional sequence across the Tr-J boundary, which indicates deposition under a more oxic condition than at any other period in the study section. The oxic period lasted for 130-170 kyr, and coincided with a faunal turnover at the end of the Triassic. On the other hand, strong enrichments of U, V, Mo, TOC and TN in Anisian and Toarcian black shales suggest deep ocean anoxia in both intervals. Highly concentrated Mo contents in some black shales indicate euxinia in the pelagic Panthalassic deep ocean. δ15NTN values are low, down to -2.0 ‰, in such black shales enriched in redox-sensitive elements, compared with other shales. This low δ15NTN values during recurrent oceanic euxinic events in the Anisian may indicate strong assimilation of ammonium, but the possibility of enhanced nitrogen fixation cannot be ruled out especially for the Toarcian anoxic event. This work provides the first documentation of the long-term redox history in the pelagic Panthalassic deep ocean, from the Middle Triassic to the Early Jurassic, based on redox-sensitive elements in shales, and it reveals probable links between oceanic redox changes and biological activity. © 2016 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/68476
Appears in Collections:过去全球变化的重建

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作者单位: Department of Earth and Planetary Science, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo, Japan; Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama, Japan; Earth-Life Science Institute, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo, Japan; Laboratory of Ocean-Earth Life Evolution Research (OELE), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, Japan; Department of Geology, The University of Leicester, Leicester, United Kingdom

Recommended Citation:
Fujisaki W.,Sawaki Y.,Yamamoto S.,et al. Tracking the redox history and nitrogen cycle in the pelagic Panthalassic deep ocean in the Middle Triassic to Early Jurassic: Insights from redox-sensitive elements and nitrogen isotopes[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,449
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