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Pyrite sulfur isotopes constrained by sedimentation rates: Evidence from sediments on the East China Sea inner shelf since the late Pleistocene
Liu, Xiting1,2; Fike, David3; Li, Anchun4; Dong, Jiang4,5; Xu, Fangjian6; Zhuang, Guangchao7; Rendle-Buehring, Rebecca8; Wan, Shiming4
Source PublicationCHEMICAL GEOLOGY
Corresponding AuthorLiu, Xiting( ; Li, Anchun(
AbstractIsotopic compositions of coeval sulfide and sulfate have been widely employed to reconstruct the seawater chemistry evolution over geologic time; however, these signals can be modulated by other factors, such as the sedimentation rate. Here, we present a data set of pyrite sulfur isotopes (delta S-34(py)) derived from 60-m drilled core sediments deposited on the inner shelf of the East China Sea since 16.5 ka. The resulting delta S-34(py) values range from -38.2 to 15.0 parts per thousand (Vienna Canyon Diablo Troilite; V-CDT), representing a range of 53.2 parts per thousand. Freshwater deposition before 12.3 ka produced a limited pyrite abundance and delta S-34(py) values that fall within the typical range of freshwater environments. After the marine incursion in the study area at 12.3 ka, variations in the delta S-34(py) values become significantly correlated with sedimentation rates (SRs; r = 0.78, p < 0.01), which were controlled by the intensity of coastal currents in response to the East Asian winter monsoon. Specifically, pyrite sulfur is markedly depleted in S-34 during the intervals with low SRs (delta S-34(py) < -30 parts per thousand) relative to that observed during the intervals with high SRs (delta S-34(py) > 0 parts per thousand), suggesting that SRs exert controls on delta S-34(py) values. We propose that these sedimentary controls are expressed by modulating the connectivity between porewaters and the overlying seawater. Low SRs tend to form an open diagenetic system, in which the pyrites are able to preserve the large biological fractionations associated with microbial sulfate reduction (and disproportionation). In contrast, high SRs favour a restricted diagenetic system, in which the distillation of porewater sulfate produces pyrites enriched in S-34, masking the magnitude of biological fractionation during microbial sulfur cycling. These findings highlight the critical effect of the local sedimentation regime on pyrite sulfur isotopic compositions, especially within shallow depositional environments, over geologic time.
KeywordPyrite Sulfur isotope Microbial sulfate reduction Mud depocenter East China Sea
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[41430965] ; National Natural Science Foundation of China[41606062] ; State Key Laboratory of Marine Geology, Tongji University[MGK1824] ; Senior User Project of RV KEXUE[KEXUE2017G1]
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000456707400007
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorLiu, Xiting; Li, Anchun
Affiliation1.Ocean Univ China, Key Lab Submarine Geosci & Prospecting Technol, Coll Marine Geosci, Qingdao 266100, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
3.Washington Univ, Dept Earth & Planetary Sci, St Louis, MO 63130 USA
4.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
6.China Univ Petr, Sch Geosci, Qingdao 266580, Peoples R China
7.Univ Georgia, Dept Marine Sci, Athens, GA 30602 USA
8.Univ Bremen, MARUM Ctr Marine Environm Sci, D-28359 Bremen, Germany
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Liu, Xiting,Fike, David,Li, Anchun,et al. Pyrite sulfur isotopes constrained by sedimentation rates: Evidence from sediments on the East China Sea inner shelf since the late Pleistocene[J]. CHEMICAL GEOLOGY,2019,505:66-75.
APA Liu, Xiting.,Fike, David.,Li, Anchun.,Dong, Jiang.,Xu, Fangjian.,...&Wan, Shiming.(2019).Pyrite sulfur isotopes constrained by sedimentation rates: Evidence from sediments on the East China Sea inner shelf since the late Pleistocene.CHEMICAL GEOLOGY,505,66-75.
MLA Liu, Xiting,et al."Pyrite sulfur isotopes constrained by sedimentation rates: Evidence from sediments on the East China Sea inner shelf since the late Pleistocene".CHEMICAL GEOLOGY 505(2019):66-75.
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