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DOI10.1016/j.gloplacha.2018.09.015
Redox condition and nitrogen cycle in the Permian deep mid-ocean: A possible contrast between Panthalassa and Tethys
Fujisaki, Wataru1; Sawaki, Yusuke2; Matsui, Yohei1,3,4; Yamamoto, Shinji5; Isozaki, Yukio2; Maruyarna, Shigenori6
发表日期2019
ISSN0921-8181
EISSN1872-6364
卷号172页码:179-199
英文摘要

To constrain the redox conditions and related nitrogen cycles during the Middle Permian (Guadalupian) to latest Late Permian (Lopingian) deep mid-Panthalassa, we determined the abundances of major, trace, and rare earth elements along with the carbon and nitrogen isotope ratios in shales interbedded with deep-sea cherts that are well-exposed at the Gujo-Hachiman section in the Mino-Tanba belt, SW Japan. The positive Ce anomalies together with low Mo and U enrichment factors (Mo-EF < 1.0; 0.7 < U-EF < 2.5) during the Guadalupian and the most of the Lopingian indicate that the deep mid-Panthalassa was under oxic condition. On the other hand, the slightly higher Mo-EF (2.0 < Mo-EF < 9.2) and U-EF (0.9 < U-EF < 2.5) values in some of the middle-late Lopingian shales suggest deposition under intermittent suboxic condition. These new findings indicate that the redox condition in the deep mid-Panthalassa never reached an anoxic condition during the Guadalupian and Lopingian until the Permian-Triassic boundary (P-TB) interval. In view of the redox state from the Guadalupian to latest Lopingian, our newly obtained delta N-15(TN) values ( - 0.12 parts per thousand to + 2.57 parts per thousand) indicate nitrate-rich conditions in the mid-Panthalassa along with large isotopic fractionation during nitrate assimilation. However, unlike the oxic and nitrate-rich deep-Panthalassa, we speculate that oxygen-depleted (i.e., anoxic/euxinic) and bioavailable nitrogen-poor conditions developed in the deep Tethys immediately before the Guadalupian-Lopingian boundary (G-LB). These environmental stresses were potentially driven by a global cooling episode (Kamura event) together with the unique paleogeography, i.e., no contact with polar ice caps in the Tethyan Ocean. Upwelling of the anoxic watermass accumulated in the deep Tethys during the global cooling episode likely triggered oceanic anoxia in the shallow-marine regions around the G-LB, which eventually resulted in the G-LB mass extinction.


WOS研究方向Physical Geography ; Geology
来源期刊GLOBAL AND PLANETARY CHANGE
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/91810
作者单位1.Japan Agcy Marine Earth Sci & Technol JAMSTEC, Res & Dev R&D Ctr Submarine Resources, 2-15 Natsushima Cho, Yokosuka, Kanagawa 2370061, Japan;
2.Univ Tokyo, Dept Earth Sci & Astron, Meguro Ku, 3-8-1 Komaba, Tokyo 1538902, Japan;
3.Japan Agcy Marine Earth Sci & Technol JAMSTEC, Project Team Dev New Generat Res Protocol Submari, 2-15 Natsushima Cho, Yokosuka, Kanagawa 2370061, Japan;
4.Japan Agcy Marine Earth Sci & Technol JAMSTEC, Dept Subsurface Geobiol Anal & Res D SUGAR, 2-15 Natsushima Cho, Yokosuka, Kanagawa 2370061, Japan;
5.Yokohama Natl Univ, Grad Sch Environm & Informat Sci, Hodogaya Ku, 79-7 Tokiwadai, Yokohama, Kanagawa 2408501, Japan;
6.Tokyo Inst Technol, Earth Life Sci Inst, Meguro Ku, 2-12-1 O Okayama, Tokyo 1528550, Japan
推荐引用方式
GB/T 7714
Fujisaki, Wataru,Sawaki, Yusuke,Matsui, Yohei,et al. Redox condition and nitrogen cycle in the Permian deep mid-ocean: A possible contrast between Panthalassa and Tethys[J],2019,172:179-199.
APA Fujisaki, Wataru,Sawaki, Yusuke,Matsui, Yohei,Yamamoto, Shinji,Isozaki, Yukio,&Maruyarna, Shigenori.(2019).Redox condition and nitrogen cycle in the Permian deep mid-ocean: A possible contrast between Panthalassa and Tethys.GLOBAL AND PLANETARY CHANGE,172,179-199.
MLA Fujisaki, Wataru,et al."Redox condition and nitrogen cycle in the Permian deep mid-ocean: A possible contrast between Panthalassa and Tethys".GLOBAL AND PLANETARY CHANGE 172(2019):179-199.
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