Low marine sulfate concentrations and the isolation of the European epicontinental sea during the Early Jurassic
Newton, Robert J.1; Reeves, Eoghan P.1; Kafousia, Nefeli1; Wignall, Paul B.1; Bottrell, Simon H.1; Sha, Jin-Geng (沙金庚)2
2011
发表期刊GEOLOGY
ISSN0091-7613
卷号39期号:1页码:7-10
摘要

Two records of seawater sulfate isotope composition from the Early Jurassic demonstrate that large isotopic gradients existed between the European epicontinental sea and the open Tethys Ocean. These differences can be explained by the modifi cation of open-ocean sulfate isotopic compositions by water-mass isolation, sea-level rise, and the effects of changing regional weathering and pyrite burial fl uxes, during a time of rapid environmental change. Both records contain large positive isotopic excursions. In the section from Europe (Yorkshire, UK), a 6 parts per thousand excursion begins in the early exaratum subzone of the Toarcian in the middle of the organic-rich shale representing a well-known oceanic anoxic event. An open Tethyan margin record from Tibet records a much larger 19 parts per thousand excursion, but the section is less well dated. Two age interpretations are possible: sparse biostrati-graphic evidence places this excursion in the Aalenian, but we suggest that it may correlate with the positive excursion in Yorkshire. Hence these records may document both a Toarcian event and an Aalenian sulfur isotope event, or the early Toarcian anoxic event alone. Conservative estimates of the rate of isotopic change with time based on the Tibetan section suggest that Early Jurassic seawater sulfate concentrations were between 1 and 5 mM, much lower than previously thought.

DOI10.1130/G31326.1
语种英语
关键词[WOS]Oceanic Anoxic Event ; Mass Extinction ; Sulfur ; Isotopes ; Carbonate ; Curves ; Shifts ; Oxygen ; Basin
资助项目Natural Environment Research Council (NERC)[NE/D011558/1] ; Natural Environment Research Council (NERC)[NE/C000854/1] ; University of Leeds Bursary ; Royal Society ; Chinese National Natural Science Foundation (Academia Sinica)[KZCX2-SW-129]
WOS研究方向Geology
WOS类目Geology
WOS记录号WOS:000285696000004
项目资助者Natural Environment Research Council (NERC) ; University of Leeds Bursary ; Royal Society ; Chinese National Natural Science Foundation (Academia Sinica)
出版者GEOLOGICAL SOC AMER, INC
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/490
专题中国科学院南京地质古生物研究所
其他
通讯作者Newton, Robert J.
作者单位1.Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, LPS, Nanjing 210008, Peoples R China
推荐引用方式
GB/T 7714
Newton, Robert J.,Reeves, Eoghan P.,Kafousia, Nefeli,et al. Low marine sulfate concentrations and the isolation of the European epicontinental sea during the Early Jurassic[J]. GEOLOGY,2011,39(1):7-10.
APA Newton, Robert J.,Reeves, Eoghan P.,Kafousia, Nefeli,Wignall, Paul B.,Bottrell, Simon H.,&Sha, Jin-Geng .(2011).Low marine sulfate concentrations and the isolation of the European epicontinental sea during the Early Jurassic.GEOLOGY,39(1),7-10.
MLA Newton, Robert J.,et al."Low marine sulfate concentrations and the isolation of the European epicontinental sea during the Early Jurassic".GEOLOGY 39.1(2011):7-10.
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