New constraints on the formation of hydrocarbon-derived low magnesium calcite at brine seeps in the Gulf of Mexico
文献类型：期刊论文
| 作者 | Huang, Huiwen1,3,4; Wang, Xudong3,4; Gong, Shanggui3,4; Krake, Nicola6; Jin, Meng1; Li, Niu; Birgel, Daniel6; Peckmann, Joern6; Cheng, Ming; Roberts, Harry H. |
| 刊名 | SEDIMENTARY GEOLOGY
 |
| 出版日期 | 2020 |
| 卷号 | 398页码:UNSP 105572 |
| 关键词 | Low magnesium calcite Methane Brine seep Gulf of Mexico |
| ISSN号 | 1879-0968 |
| DOI | 10.1016/j.sedgeo.2019.105572 |
| 英文摘要 | Hydrocarbon-rich brine seeps - representing extreme environments typified by halophilic and chemotrophic organisms - may provide insight into the ecology of microorganisms on an early Earth and possibly other planetary bodies. Authigenic low magnesium calcite (LMC) is common at brine seeps and represents an archive of fluid compositions, fluid origin, and the conditions under which this carbonate mineral formed. Here we present the analysis of authigenic LMC from three hydrocarbon-rich brine seeps (GB260, similar to 460 m; GB697, similar to 1280 m; AC601, similar to 2340 m) from the Gulf of Mexico. The formation of LMC was favored by brine fluids with extremely low Mg/Ca mole ratios (e.g. <2) relative to seawater (Mg/Ca mole ratio of similar to 5.2). Petrographic observations reveal that the studied LMC is of primary origin. Its delta C-13 values vary from -53.5 parts per thousand to 14.0 parts per thousand, indicating variable carbon sources that include C-13-depleted methane, crude oil, seawater dissolved inorganic carbon, and C-13-enriched residual carbonate species reflecting methanogenesis. In contrast, LMC shows predominantly relatively high delta C-13(org) values (from -39.0 parts per thousand to -25.7 parts per thousand), suggesting an unrecognized local source of nutrients fueling the local production of biomass. The delta O-18 values of LMC (as high as 6.0 parts per thousand) are too high for precipitation in equilibrium with seawater. probably reflecting the involvement of deep formation fluids. The wide range of Sr-87/Sr-88 ratios and the enrichment of Sr and Ba in LMC is in accordance with pore fluids deriving from the dissolution of the Louann salt or alteration of silicates in deep sediments. Given the stability of LMC, its petrographic and geochemical characterization achieved in this study can be used to better constrain brine seep activities throughout the geological record. (C) 2019 Elsevier B.V. All rights reserved. |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18566]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 作者单位 | 1.Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai 201306, Peoples R China 2.Univ Hamburg, Ctr Earth Syst Res & Sustainabil, Inst Geol, D-20146 Hamburg, Germany 3.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China 4.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266061, Peoples R China 5.Roberts, Harry H.] Louisiana State Univ, Coll Coastal & Environm, Coastal Studies Inst, Baton Rouge, LA 70803 USA 6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Huang, Huiwen,Wang, Xudong,Gong, Shanggui,et al. New constraints on the formation of hydrocarbon-derived low magnesium calcite at brine seeps in the Gulf of Mexico[J]. SEDIMENTARY GEOLOGY,2020,398:UNSP 105572. |
| APA | Huang, Huiwen.,Wang, Xudong.,Gong, Shanggui.,Krake, Nicola.,Jin, Meng.,...&Feng, Dong.(2020).New constraints on the formation of hydrocarbon-derived low magnesium calcite at brine seeps in the Gulf of Mexico.SEDIMENTARY GEOLOGY,398,UNSP 105572. |
| MLA | Huang, Huiwen,et al."New constraints on the formation of hydrocarbon-derived low magnesium calcite at brine seeps in the Gulf of Mexico".SEDIMENTARY GEOLOGY 398(2020):UNSP 105572. |
入库方式： OAI收割
来源：南海海洋研究所
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