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Mercury loss and isotope fractionation during thermal maturation of organic-rich mudrocks
Zeyang Liu; Hui Tian; Runsheng Yin; Di Chen; Haifeng Gai
2022
Source PublicationChemical Geology
Volume612Pages:121144
Abstract

Mercury (Hg) concentration and isotopic composition of organic-rich sedimentary rocks have been widely used as proxies to track ancient volcanism and associated environmental perturbations. However, interpretation of the Hg data is based on the assumption that the thermal maturity of the sedimentary rocks has limited effects on Hg abundance and isotopic composition, which is yet to be evaluated. Here we conduct closed-system anhydrous pyrolysis experiments to investigate the changes of Hg concentration and isotope composition during the thermal mature process, using both marine and lacustrine mudrocks. A siliceous shale section (Luocun, China) with heterogeneous thermal maturity caused by dike intrusion was also analyzed for Hg. Significant Hg loss (over 80%), with variations of δ202Hg (by 0.3 to 0.7‰) but small variations of Δ199Hg (by <0.1 to 0.36‰), were observed during the experiment. The Hg isotopic variation may be caused by the release of isotopically distinct Hg in different mineral phases at different temperatures. Samples from the Luocun section have anomalously low Hg and Hg/TOC values, due to thermal maturity. These findings suggest that (1) thermal maturation of organic-rich shales may be an important factor in distribution of Hg in sediments, and (2) the use of Hg, Hg/TOC and Hg isotopes proxies for paleoclimate and paleoceanography reconstruction should be applied in caution in substrates that may have experienced significant thermal alteration, especially if sill/dike intrusions were present that may cause large varieties of thermal maturity within sedimentary sections.

KeywordThermal Maturity Mudrock Volcanism Kerogen Source Rock Correlation Paleoclimate
DOI10.1016/j.chemgeo.2022.121144
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Indexed BySCI
Language英语
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Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/13657
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.CAS Center for Excellence in Deep Earth Science, Guangzhou, 510640, China
3.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Recommended Citation
GB/T 7714
Zeyang Liu,Hui Tian,Runsheng Yin,et al. Mercury loss and isotope fractionation during thermal maturation of organic-rich mudrocks[J]. Chemical Geology,2022,612:121144.
APA Zeyang Liu,Hui Tian,Runsheng Yin,Di Chen,&Haifeng Gai.(2022).Mercury loss and isotope fractionation during thermal maturation of organic-rich mudrocks.Chemical Geology,612,121144.
MLA Zeyang Liu,et al."Mercury loss and isotope fractionation during thermal maturation of organic-rich mudrocks".Chemical Geology 612(2022):121144.
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