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New insights into cerium anomalies and mechanisms of trace metal enrichment in authigenic carbonate from hydrocarbon seeps
Hu, Y; Feng, D; Peckmann, J; Roberts, HH; Chen, DF; feng@scsio.ac.cn; cdf@gig.ac.cn
2014
Source PublicationCHEMICAL GEOLOGY
ISSN0009-2541
Volume381Pages:55-66
AbstractAuthigenic carbonates that form at marine hydrocarbon seeps provide a unique geological archive of past local environmental conditions and pore fluid geochemistry. Recent work on such carbonates revealed variable cerium (Ce) anomalies and anomalous enrichments of certain trace metals. However, the mechanisms accounting for such anomalies remain poorly constrained. Here, we characterize the rare earth element (REE) patterns of carbonate phases and the trace metal patterns of bulk carbonate rocks sampled at three hydrocarbon seeps located at Congo Fan pockmarks (CF) and the Gulf of Mexico sites AC645 and GB425. The analyzed CF, GB425, and AC645 carbonates yielded different REE patterns, displaying positive, no, as well as negative Ce anomalies. The covariation of molybdenum (Mo) with uranium (U), including authigenic Mo (Mo-auth) and U (U-auth) enrichments as well as (Mo/U)(auth) ratios proved useful to obtain new insight into the applicability of Ce anomalies to constrain past redox conditions. Trace element patterns suggest that (1) CF carbonates formed in a restricted sulfidic environment, while (2) the AC645 site experienced intermittent oxygenation causing negative Ce anomalies, and (3) environmental conditions were variable at the GB425 mud volcano site. Interestingly, GB425 carbonates show significant Mo, arsenic (As), and antimony (Sb) enrichments with the enrichment factor of As (As-EF) correlating well with the authigenic Fe fraction. These results suggest that iron oxyhydroxides played an important role in the adsorption of Mo, As, and Sb in the water column and their transfer to the sediment. The combination of trace metal and REE geochemistry of authigenic carbonates used here is a promising tool to better assess past variability of redox conditions and biogeochemical processes at marine hydrocarbon seeps. (C) 2014 Elsevier B. V. All rights reserved.
Department[Hu, Yu ; Chen, Duofu] Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Marginal Sea Geol, Guangzhou 510640, Guangdong, Peoples R China ; [Feng, Dong ; Chen, Duofu] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China ; [Peckmann, Joern] Univ Vienna, Ctr Earth Sci, Dept Geodynam & Sedimentol, A-1090 Vienna, Austria ; [Roberts, Harry H.] Louisiana State Univ, Dept Oceanog & Coastal Sci, Inst Coastal Studies, Baton Rouge, LA 70803 USA ; [Hu, Yu] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
KeywordHydrocarbon Seeps Authigenic Carbonates Rare Earth Elements Trace Metals Redox Conditions Trace Metal Enrichments
Subject AreaGeochemistry & Geophysics
Funding OrganizationBOEM; NOAA; NSF of China [91228206, 41373085]; "Hundred Talents Program" of CAS; LSU Boyd Professionship ; BOEM; NOAA; NSF of China [91228206, 41373085]; "Hundred Talents Program" of CAS; LSU Boyd Professionship ; BOEM; NOAA; NSF of China [91228206, 41373085]; "Hundred Talents Program" of CAS; LSU Boyd Professionship ; BOEM; NOAA; NSF of China [91228206, 41373085]; "Hundred Talents Program" of CAS; LSU Boyd Professionship
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Indexed Bysci
Funding Project海洋地质
Funding OrganizationBOEM; NOAA; NSF of China [91228206, 41373085]; "Hundred Talents Program" of CAS; LSU Boyd Professionship ; BOEM; NOAA; NSF of China [91228206, 41373085]; "Hundred Talents Program" of CAS; LSU Boyd Professionship ; BOEM; NOAA; NSF of China [91228206, 41373085]; "Hundred Talents Program" of CAS; LSU Boyd Professionship ; BOEM; NOAA; NSF of China [91228206, 41373085]; "Hundred Talents Program" of CAS; LSU Boyd Professionship
WOS IDWOS:000340208500006
Citation statistics
Cited Times:58[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/10607
Collection中科院边缘海地质重点实验室
Corresponding Authorfeng@scsio.ac.cn; cdf@gig.ac.cn
Recommended Citation
GB/T 7714
Hu, Y,Feng, D,Peckmann, J,et al. New insights into cerium anomalies and mechanisms of trace metal enrichment in authigenic carbonate from hydrocarbon seeps[J]. CHEMICAL GEOLOGY,2014,381:55-66.
APA Hu, Y.,Feng, D.,Peckmann, J.,Roberts, HH.,Chen, DF.,...&cdf@gig.ac.cn.(2014).New insights into cerium anomalies and mechanisms of trace metal enrichment in authigenic carbonate from hydrocarbon seeps.CHEMICAL GEOLOGY,381,55-66.
MLA Hu, Y,et al."New insights into cerium anomalies and mechanisms of trace metal enrichment in authigenic carbonate from hydrocarbon seeps".CHEMICAL GEOLOGY 381(2014):55-66.
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