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Carbon, sulfur, and oxygen isotope evidence for a strong depth gradient and oceanic oxidation after the Ediacaran Hankalchough glaciation
Shen, Bing1; Xiao, Shuhai2; Bao, Huiming3; Kaufman, Alan J.4; Zhou, Chuanming (周传明)5; Yuan, Xunlai (袁训来)5
2011-03-01
Source PublicationGEOCHIMICA ET COSMOCHIMICA ACTA
ISSN0016-7037
Volume75Issue:5Pages:1357-1373
Abstract

In order to understand spatial variations of stable isotope geochemistry in the Quruqtagh basin (northwestern China) in the aftermath of an Ediacaran glaciation, we analyzed carbonate carbon isotopes (delta(13)C(carb)), carbonate oxygen isotopes (delta(18)C(carb)), carbonate associated sulfate sulfur (delta(34)S(CAS)) and oxygen isotopes (delta(18)O(CAS)), and pyrite sulfur isotopes (delta(34)S(py)) of a cap dolostone atop the Ediacaran Hankalchough glacial diamictite at four sections. The four studied sections (YKG, MK, H and ZBS) represent an onshore offshore transect in the Quruqtagh basin. Our data show a strong paleobathymetry-dependent isotopic gradient. From the onshore to offshore sections, delta(13)C(carb) values decrease from -2 parts per thousand to -16 parts per thousand (VPDB), whereas delta(18)C(carb) values increase from -4 parts per thousand to -1 parts per thousand (VPDB). Both delta(34)S(CAS) and delta(34)S(py) show stratigraphic variations in the two onshore sections (MK and YKG), but are more stable in the two offshore sections (H and ZBS). delta(18)O(CAs) values of onshore samples are consistent with terrestrial oxidative weathering of pyrite. We propose that following the Hankalchough glaciation seawater in the Quruqtagh basin was characterized by a strong isotopic gradient. The isotopic data may be interpreted using a three-component mixing model that involves three reservoirs: deep-basin water, surface water, and terrestrial weathering input. In this model, the negative delta(13)C(carb) values in the offshore sections are related to the upwelling of deep-basin water (where anaerobic oxidation of dissolved organic carbon resulted in (13)C-depleted DIC), whereas sulfur isotope variations are strongly controlled by surface water sulfate and terrestrial weathering input derived from oxidative weathering of pyrite. The new data provide evidence for the oceanic oxidation following the Hankalchough glaciation. (C) 2010 Elsevier Ltd. All rights reserved.

DOI10.1016/j.gca.2010.12.015
Language英语
WOS KeywordNeoproterozoic Snowball Earth ; Basal Cambrian Microfossils ; South China ; Yangtze Platform ; Doushantuo Formation ; Proterozoic Ocean ; Abiotic Oxidation ; Northwest China ; Cap Carbonates ; Marine Sulfate
Funding ProjectNational Science Foundation ; NASA ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Ministry of Science and Technology
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000287289200011
Funding OrganizationNational Science Foundation ; NASA ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Ministry of Science and Technology
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:25[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/467
Collection中国科学院南京地质古生物研究所
其他
Corresponding AuthorShen, Bing
Affiliation1.Rice Univ, Dept Earth Sci, Houston, TX 77005 USA
2.Virginia Polytech Inst & State Univ, Dept Geosci, Blacksburg, VA 24061 USA
3.Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA
4.Univ Maryland, Dept Geol, College Pk, MD 20742 USA
5.Chinese Acad Sci, State Key Lab Paleobiol & Stratig, Nanjing Inst Geol & Paleontol, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Shen, Bing,Xiao, Shuhai,Bao, Huiming,et al. Carbon, sulfur, and oxygen isotope evidence for a strong depth gradient and oceanic oxidation after the Ediacaran Hankalchough glaciation[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2011,75(5):1357-1373.
APA Shen, Bing,Xiao, Shuhai,Bao, Huiming,Kaufman, Alan J.,Zhou, Chuanming ,&Yuan, Xunlai .(2011).Carbon, sulfur, and oxygen isotope evidence for a strong depth gradient and oceanic oxidation after the Ediacaran Hankalchough glaciation.GEOCHIMICA ET COSMOCHIMICA ACTA,75(5),1357-1373.
MLA Shen, Bing,et al."Carbon, sulfur, and oxygen isotope evidence for a strong depth gradient and oceanic oxidation after the Ediacaran Hankalchough glaciation".GEOCHIMICA ET COSMOCHIMICA ACTA 75.5(2011):1357-1373.
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