NIGPAS OpenIR
Lower Triassic deep sea carbonate precipitates from South Tibet, China
Li, Mingtao1; Song, Haijun1; Tian, Li1,3; Woods, Adam D.2; Dai, Xu1; Song, Huyue1
2018-11-15
发表期刊SEDIMENTARY GEOLOGY
ISSN0037-0738
卷号376页码:60-71
摘要

Sea-floor carbonate precipitates (SCPs), commonly seen in pre-Cambrian strata, were widely developed during the Permian-Triassic mass extinction and the Early Triassic recovery interval. Most SCPs are found in shallow water facies, with few SCPs reported from deep sea settings. Here, we document Lower Triassic deep sea SCPs from turbidite deposits exposed at the Xiukang section, South Tibet, China. The SCPs only occur within thin-bedded, silty limestones that are embedded in dark grey shale. Parallel-aligned mud cobbles, rounded micritic intraclasts and micro-erosional surfaces are commonly seen in these planar laminated limestones that contain abundant radiolarians and thin-shelled bivalves, indicating deposition in a deep basin via turbidity currents. The deep sea SCPs, which are comprised of bladed calcite crystals, display a weak vertical delta C-13 variation with the overlying matrix, and a uniform element distribution and consequently have a homogenous cathodoluminescence pattern, suggesting rapid precipitation in the open ocean, followed by a quick burial, which led to minimal diagenetic effects on the SCPs. We propose a new hypothesis that rapid carbonate precipitation resulted from mixing, driven by the turbidity current that introduced shallow seawater to the deep seawaters with a high alkalinity. Based on this model, the turbidity currents during the Early Triassic might serve as a potential role in the connection between the oxic surface oceans and the euxinic, deep oceans. (C) 2018 Elsevier B.V. All rights reserved.

关键词Carbonate Crystals Turbidites Carbonate Supersaturation Oceanic Anoxia Deep Sea
DOI10.1016/j.sedgeo.2018.08.004
语种英语
关键词[WOS]Permian Mass Extinction ; Photic-zone Euxinia ; Environmental-change ; Turbidity Currents ; Framboidal Pyrite ; Weathering Rates ; Redox Conditions ; Biotic Recovery ; Climate-change ; United-states
资助项目National Natural Science Foundation of China[41622207] ; National Natural Science Foundation of China[41602024] ; National Natural Science Foundation of China[41530104] ; National Natural Science Foundation of China[41661134047] ; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences)[163113] ; 111 Project[B08030]
WOS研究方向Geology
WOS类目Geology
WOS记录号WOS:000449135400005
项目资助者National Natural Science Foundation of China ; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences) ; 111 Project
出版者ELSEVIER SCIENCE BV
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/16823
专题中国科学院南京地质古生物研究所
通讯作者Song, Haijun; Tian, Li
作者单位1.China Univ Geosci, Sch Earth Sci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Hubei, Peoples R China
2.Calif State Univ Fullerton, Dept Geol Sci, 800N State Coll Blvd, Fullerton, CA 92834 USA
3.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China
通讯作者单位中国科学院南京地质古生物研究所
推荐引用方式
GB/T 7714
Li, Mingtao,Song, Haijun,Tian, Li,et al. Lower Triassic deep sea carbonate precipitates from South Tibet, China[J]. SEDIMENTARY GEOLOGY,2018,376:60-71.
APA Li, Mingtao,Song, Haijun,Tian, Li,Woods, Adam D.,Dai, Xu,&Song, Huyue.(2018).Lower Triassic deep sea carbonate precipitates from South Tibet, China.SEDIMENTARY GEOLOGY,376,60-71.
MLA Li, Mingtao,et al."Lower Triassic deep sea carbonate precipitates from South Tibet, China".SEDIMENTARY GEOLOGY 376(2018):60-71.
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