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学科主题: Oceanography
题名: A comparative study of authigenic carbonates from mussel and tubeworm environments: Implications for discriminating the effects of tubeworms
作者: [Feng, Dong] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China ; [Feng, Dong ; Roberts, Harry H.] Louisiana State Univ, Sch Coast & Environm, Dept Oceanog & Coastal Sci, Inst Coastal Studies, Baton Rouge, LA 70803 USA ; [Cordes, Erik E.] Temple Univ, Dept Biol, Philadelphia, PA 19122 USA ; [Fisher, Charles R.] Penn State Univ, Dept Biol, University Pk, PA 16802 USA
通讯作者: feng@scsio.ac.cn
关键词: Authigenic carbonate ; Mussel ; Tubeworm ; Hydrocarbon seep ; Gulf of Mexico
刊名: DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
发表日期: 2013
卷: 75, 页:110-118
部门归属: 海洋地质
资助者: The authors thank the Bureau of Ocean Energy Management (BOEM; formerly the MMS) and the National Oceanic and Atmospheric Administration (NOAA) for support of the 2006 Alvin and 2007 Jason II dives. We express our sincere appreciation to the crews of the DSV Alvin, R/V Atlantis, ROV Jason II and R/V RON BROWN for their professionalism and friendship in helping us meet our scientific objectives during the cruises. We thank D. Chen, F. Wang, and W. Deng (all GIG, CAS) for technical assistance. This study was partially supported by the Knowledge Innovation Program of CAS (KZCX2-YW-GJ03), NSF of China (Grants: 40906031 and 91228206), "Hundred Talents Program" of CAS, and the LSU Boyd Professionship. Furthermore, we thank Dr. M. Bacon, Dr. R. Francois and two anonymous reviewers for their helpful comments that greatly improved an earlier version of this manuscript.
摘要: The Gulf of Mexico hydrocarbon seeps are often populated by dense mussel beds and tubeworm aggregations, as well as exposed authigenic carbonate outcrops. Previous studies suggest the activity of mussels and tubeworms could influence the sediment geochemistry of their habitats, resulting in variations in the stable carbon isotopes of the associated carbonates. However, this conclusion was based on the analyses of samples from a single site. To better understand whether there are consistent differences in the geochemical environments of mussels and tubeworms, mineralogical and stable isotopic compositions of authigenic carbonates from mussel and tubeworm environments from four seep sites were analyzed. The studied sites span a depth range of 1200 m to 2800 m on the northern Gulf of Mexico continental slope. We found that carbonate samples from tubeworm environments were more prone to contain aragonite whereas carbonates from mussel environments were more likely to have calcite. This finding supports the hypothesis that vestimentiferans release sulfate across their roots into the pore waters of the surrounding sediments, a process that could generate a locally sulfate-enriched environment that favors the precipitation of aragonite instead of calcite. Moreover, the delta C-13 values of tubeworm carbonates are generally lighter than that of mussel carbonates from the same site, which is consistent with the fact that tubeworms are fueling extra subsurface methane oxidation through the release of sulfate into the sediment. Such a process, consequently, enriches the subsurface dissolved inorganic carbon pool with light carbon derived from the seeping hydrocarbons. Taken together, our data suggest that tubeworms could produce a carbon isotope shift that is sufficient to influence the sediment geochemistry of their immediate area, and that this impact is reflected in the associated authigenic carbonates. (C) 2013 Elsevier Ltd. All rights reserved.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000317888800009
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/11132
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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[Feng, Dong] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Feng, Dong; Roberts, Harry H.] Louisiana State Univ, Sch Coast & Environm, Dept Oceanog & Coastal Sci, Inst Coastal Studies, Baton Rouge, LA 70803 USA; [Cordes, Erik E.] Temple Univ, Dept Biol, Philadelphia, PA 19122 USA; [Fisher, Charles R.] Penn State Univ, Dept Biol, University Pk, PA 16802 USA.A comparative study of authigenic carbonates from mussel and tubeworm environments: Implications for discriminating the effects of tubeworms,DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,2013,75():110-118
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