气候变化领域集成服务门户(CCPortal): Redox conditions and nitrogen cycling during the Triassic-Jurassic transition: A new perspective from the mid-Panthalassa

CCPortal

DOI	10.1016/j.earscirev.2020.103173
	Redox conditions and nitrogen cycling during the Triassic-Jurassic transition: A new perspective from the mid-Panthalassa
	Fujisaki W.; Fukami Y.; Matsui Y.; Sato T.; Sawaki Y.; Suzuki K.
发表日期	2020
ISSN	0012-8707
卷号	204
英文摘要	We determined redox-sensitive element concentrations along with δ15NTN values from the Triassic-Jurassic shales interbedded within deep-sea cherts at the Katsuyama section, SW Japan, to clarify the redox and related nitrogen cycle conditions in mid-Panthalassa during the TJB biotic crisis, focusing particularly on the linkages with CAMP volcanism. Slight enrichments of Mn and Mo across the TJB suggest a vertically expanded mid-Panthalassic OMZ above a well‑oxygenated deep ocean. Moreover, high-resolution δ15NTN records during the Triassic-Jurassic transition exhibit a negative nitrogen isotope excursion (NNIE) just above the TJB. Relative to the previously reported negative carbon isotope excursion (NCIE) across the TJB, the NNIE can be divided into two intervals: negative interval 1 (NI-1) during the NCIE and NI-2 after the NCIE. The NNIE can be explained as an interval of nitrate-rich conditions, reflecting an oxic Panthalassic Ocean during the Triassic-Jurassic transition. Our geochemical dataset provides new insights into environmental perturbations in mid-Panthalassia during the TJB biotic crisis: (1) a vertically expanded OMZ and decreased primary productivity owing to global warming caused by CAMP volcanism across the TJB resulted in an increased nitrate concentration during the NI-1, and (2) eutrophic, nitrate-rich conditions developed in mid-Panthalassa during the NI-2 due to the enhanced continental weathering and deep-water upwelling. Significantly, our results are the first to demonstrate that the OMZs were expanded not only in the shallow-marine regions, but also in pelagic sites across the TJB, suggesting that the globally expanded OMZs can be regarded as a crucial driver for the TJB biotic crisis. © 2020 Elsevier B.V.
英文关键词	Bedded cherts; Central Atlantic Magmatic Provinces (CAMP); Japan; Manganese; Mass extinction; Molybdenum
语种	英语
scopus关键词	chemostratigraphy; concentration (composition); isotopic composition; Jurassic; nitrogen cycle; nitrogen isotope; paleoenvironment; redox conditions; Triassic
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209636
作者单位	Research Institute for Marine Resources Utilization (MRU), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15, Natsushima-cho, Yokosuka-city, Kanagawa 237-0061, Japan; Department of Chemistry, Faculty of Science, Gakushuin University, Mejiro, 1-5-1, Toshima, Tokyo, 171-8588, Japan; Institute for Extra-cutting-edge Science and Technology Avant-grade Research (X-star), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15, Natsushima-cho, Yokosuka-city, Kanagawa 237-0061, Japan; Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8564, Japan; Research Institute for Marine Geodynamics (IMG), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15, Natsushima-cho, Yokosuka-city, Kanagawa 237-0061, Japan; Department of Earth Science and Astronomy, The University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo, 153-8902, Japan
推荐引用方式 GB/T 7714	Fujisaki W.,Fukami Y.,Matsui Y.,et al. Redox conditions and nitrogen cycling during the Triassic-Jurassic transition: A new perspective from the mid-Panthalassa[J],2020,204.
APA	Fujisaki W.,Fukami Y.,Matsui Y.,Sato T.,Sawaki Y.,&Suzuki K..(2020).Redox conditions and nitrogen cycling during the Triassic-Jurassic transition: A new perspective from the mid-Panthalassa.EARTH-SCIENCE REVIEWS,204.
MLA	Fujisaki W.,et al."Redox conditions and nitrogen cycling during the Triassic-Jurassic transition: A new perspective from the mid-Panthalassa".EARTH-SCIENCE REVIEWS 204(2020).