New insights into cerium anomalies and mechanisms of trace metal enrichment in authigenic carbonate from hydrocarbon seeps
文献类型：期刊论文
| 作者 | Hu, Y ; Feng, D ; Peckmann, J ; Roberts, HH ; Chen, DF |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2014 |
| 卷号 | 381页码:55-66 |
| 关键词 | Hydrocarbon seeps Authigenic carbonates Rare earth elements Trace metals Redox conditions Trace metal enrichments |
| ISSN号 | 0009-2541 |
| 通讯作者 | feng@scsio.ac.cn ; cdf@gig.ac.cn |
| 中文摘要 | Authigenic 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. |
| 学科主题 | Geochemistry & Geophysics |
| 收录类别 | SCI |
| 资助信息 | BOEM; NOAA; NSF of China [91228206, 41373085]; "Hundred Talents Program" of CAS; LSU Boyd Professionship |
| 原文出处 | ELSEVIER SCIENCE BV |
| WOS记录号 | WOS:000340208500006 |
| 公开日期 | 2014-12-11 |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/10607]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 推荐引用方式 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.(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. |
入库方式： OAI收割
来源：南海海洋研究所
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