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学科主题: Geology
题名: Formation of low-magnesium calcite at cold seeps in an aragonite sea
作者: Feng, D ; Roberts, HH ; Joye, SB ; Heydari, E
通讯作者: feng@scsio.ac.cn
刊名: TERRA NOVA
发表日期: 2014
卷: 26, 期:2, 页:150-156
收录类别: sci
部门归属: [Feng, Dong] Chinese Acad Sci, Key Lab Marginal Sea Geol, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China ; [Roberts, Harry H.] Louisiana State Univ, Inst Coastal Studies, Dept Oceanog & Coastal Sci, Baton Rouge, LA 70803 USA ; [Joye, Samantha B.] Univ Georgia, Dept Marine Sci, Athens, GA 30602 USA ; [Heydari, Ezat] Jackson State Univ, Dept Phys Atmospher Sci & Geosci, Jackson, MS 39217 USA
项目归属: 海洋地质
资助者: Hundred Talents Program of CAS, NSFC [91228206, 41373085]; GIGCAS 135 project [Y234021001]; NSF Emerging Frontiers program [EF-0801741]; LSU Boyd Professorship
摘要: This study investigates the conditions of occurrence and petrographic characteristics of low-Mg calcite (LMC) from cold seeps of the Gulf of Mexico at a water depth of 2340m. Such LMC mineral phases should precipitate in calcite seas rather than today's aragonite sea. The C-13-depleted carbonates formed as a consequence of anaerobic oxidation of hydrocarbons in shallow subsurface cold seep environments. The occurrence of LMC may result from brine fluid flows. Brines are relatively Ca2+-enriched and Mg2+-depleted (Mg/Ca mole ratio <0.7) relative to seawater, where the Mg/Ca mole ratio is ~5, which drives high-Mg calcite and aragonite precipitation. The dissolution of aragonitic mollusk shells, grains and cements was observed. Aerobic oxidation of hydrocarbons and H2S is the most likely mechanism to explain carbonate dissolution. These findings have important implications for understanding the occurrence of LMC in deep water marine settings and consequently their counterparts in the geological record.
原文出处: 查看原文
WOS记录号: WOS:000332700800008
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10632
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, D; Roberts, HH; Joye, SB; Heydari, E.Formation of low-magnesium calcite at cold seeps in an aragonite sea,TERRA NOVA,2014,26(2):150-156
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