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Coupled delta Ca-44/40, delta Sr-88/86, and Sr-87/Sr-86 geochemistry across the end-Permian mass extinction event
Wang, Jiuyuan1; Jacobson, Andrew D.1; Zhang, Hua (张华)2,3; Ramezani, Jahandar4; Sageman, Bradley B.1; Hurtgen, Matthew T.1; Bowring, Samuel A.4; Shen, Shu-zhong (沈树忠)5
2019-10-01
Source PublicationGEOCHIMICA ET COSMOCHIMICA ACTA
ISSN0016-7037
Volume262Pages:143-165
Abstract

We report high-resolution, high-precision delta Ca-44/40, delta Sr-88/86, and Sr-87/Sr-86 records spanning the Permian-Triassic boundary (PTB) from the Meishan and Dajiang carbonate successions in south China. The goal of the study was to understand the behavior of Ca and Sr isotopes during a time period in Earth history characterized by severe biological and environmental perturbations, including a major mass extinction, flood basalt volcanism, ocean acidification, and sea level fluctuations. Dajiang displays negative delta Ca-44/40 and delta Sr-88/86 excursions and invariant Sr-87/Sr-86 ratios in the <60 kyr timeframe between the main extinction horizon and the PTB. The Meishan delta Ca-44/40 and delta Sr-88/86 records are generally shifted to higher values and display both synchronous and asynchronous trends relative to Dajiang. In addition, Sr-87/Sr-86 ratios at Meishan are significantly elevated and do not define a clear secular pattern. We reconcile diverse conceptual models for the dataset with the aid of supporting elemental and isotope measurements (e.g., Sr/Ca, delta C-13, and delta O-18), as well as sequential leaching experiments. The combined body of evidence indicates that Dajiang sediments experienced recrystallization and neomorphism under rock-buffered conditions that preserved primary signals. In contrast, the Meishan records display influences from both primary and secondary processes, including local differences in fractionation, fluid-buffered early marine diagenesis, and late stage diagenetic overprinting. The three isotopic records for Dajiang, and to some extent, the delta Ca-44/40 and delta Sr-88/86 records for Meishan, preserve information about the geochemistry of end-Permian seawater. We find that enhanced weathering of shelf carbonates during sea level fall provides the best explanation for rapidly decreasing seawater delta Ca-44/40 and delta Sr-88/86 values without affecting Sr-87/Sr-86 ratios. (C) 2019 Elsevier Ltd. All rights reserved.

KeywordCalcium isotopes Radiogenic Sr isotopes Stable Sr isotopes end-Permian Chemical weathering Diagenesis
DOI10.1016/j.gca.2019.07.035
Language英语
WOS KeywordCALCIUM ISOTOPE FRACTIONATION ; STABLE SR-ISOTOPE ; MULTICOMPONENT CARBONATE SYSTEM ; EARLY MARINE DIAGENESIS ; PHOTIC-ZONE EUXINIA ; TRIASSIC BOUNDARY ; SOUTH CHINA ; OCEAN ACIDIFICATION ; NANPANJIANG BASIN ; TRACE-ELEMENT
Funding ProjectDavid and Lucile Packard Foundation[200731757] ; National Science Foundation[NSF-EAR 0723151] ; Key Research Program of Frontier Sciences[QYZDY-SSW-DQC023] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB18000000]
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000481616700009
Funding OrganizationDavid and Lucile Packard Foundation ; National Science Foundation ; Key Research Program of Frontier Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/27958
Collection中国科学院南京地质古生物研究所
Corresponding AuthorWang, Jiuyuan
Affiliation1.Northwestern Univ, Dept Earth & Planetary Sci, Evanston, IL 60208 USA
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Paleobiol & Stratig, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
3.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
4.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA
5.Nanjing Univ, Sch Earth Sci & Engn, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Wang, Jiuyuan,Jacobson, Andrew D.,Zhang, Hua ,et al. Coupled delta Ca-44/40, delta Sr-88/86, and Sr-87/Sr-86 geochemistry across the end-Permian mass extinction event[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2019,262:143-165.
APA Wang, Jiuyuan.,Jacobson, Andrew D..,Zhang, Hua .,Ramezani, Jahandar.,Sageman, Bradley B..,...&Shen, Shu-zhong .(2019).Coupled delta Ca-44/40, delta Sr-88/86, and Sr-87/Sr-86 geochemistry across the end-Permian mass extinction event.GEOCHIMICA ET COSMOCHIMICA ACTA,262,143-165.
MLA Wang, Jiuyuan,et al."Coupled delta Ca-44/40, delta Sr-88/86, and Sr-87/Sr-86 geochemistry across the end-Permian mass extinction event".GEOCHIMICA ET COSMOCHIMICA ACTA 262(2019):143-165.
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