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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
Source PublicationSEDIMENTARY GEOLOGY
ISSN0037-0738
Volume376Pages:60-71
Abstract

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.

KeywordCarbonate Crystals Turbidites Carbonate Supersaturation Oceanic Anoxia Deep Sea
DOI10.1016/j.sedgeo.2018.08.004
Language英语
WOS KeywordPermian Mass Extinction ; Photic-zone Euxinia ; Environmental-change ; Turbidity Currents ; Framboidal Pyrite ; Weathering Rates ; Redox Conditions ; Biotic Recovery ; Climate-change ; United-states
Funding ProjectNational 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 Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000449135400005
Funding OrganizationNational Natural Science Foundation of China ; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences) ; 111 Project
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/16823
Collection中国科学院南京地质古生物研究所
Corresponding AuthorSong, Haijun; Tian, Li
Affiliation1.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
Corresponding Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
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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