墨西哥湾北部上陆坡Green Canyon 140冷泉活动在自生碳酸盐岩中的地球化学记录
Cold seep activities recorded by geochemical characteristics of authigenic carbonates from Green Canyon 140, Gulf of Mexico
查看参考文献48篇
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文摘
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墨西哥湾北部上陆坡Green Canyon 140产出的冷泉碳酸盐岩可以分为结核结壳、生物碎屑结壳和块状结壳三类。三类结壳均以高镁方解石和文石为主要矿物,另外,结核结壳含少量白云石,生物碎屑结壳含少量低镁方解石。团粒、凝块、草莓状黄铁矿和生物钻孔等生物成因沉积组构发育,且含有以有孔虫和双壳类为主的生物碎屑。三类结壳的碳同位素值变化较大δ~(13)C值为-36.1‰~5.1‰,指示了产甲烷残余CO_2、海水源碳或热成因甲烷的混合碳源特征。结核结壳胶结的生物壳~(14)C年龄为46.5~25.8 ka BP,生物碎屑结壳为17.6~11.7 ka BP,块状结壳为~1.2kaBP,显示了该地区冷泉活动的间歇性特征。 |
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其他语种文摘
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Seep carbonates collected from Green Canyon block 140, Gulf of Mexico, could be divided into three types: nodule-rich carbonates, bioclast-rich carbonates and massive carbonates. XRD investigation shows that high Mg-calcite and aragonite are the dominate minerals. Additionally, nodule-rich carbonates contain minor amounts of dolomite and bioclast-rich carbonates include some low Mg-calcite. Peloids, clotted microfabric and pyrite framboids are developed in carbonates and suggest a genesis linked with bacterial activities. The carbonates exhibit a large variation in δ~(13)C values (-36.1‰ to 5.1‰), suggesting multiple carbon sources that include thermogenic methane, seawater and residual CO_2 from methanogenesis. Shells cemented in nodule-rich carbonates show 14C ages between 46.5 ka and 25.8 ka BP, bioclast-rich carbonates formed from 17.6 ka to 11.7 ka BP, and massive carbonates have ~(14)C ages of 1.2 ka BP, suggesting that seep activity was discontinuous. |
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来源
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地球化学
,2013,42(3):212-220 【核心库】
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关键词
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冷泉碳酸盐岩
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碳同位素
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氧同位素
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~(14)C定年
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冷泉活动
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墨西哥湾
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地址
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广州地球化学研究所, 中国科学院边缘海地质重点实验室, 广东, 广州, 510640
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0379-1726 |
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学科
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地质学;海洋学 |
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基金
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中国科学院知识创新工程重要方向项目
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国家自然科学基金
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中国科学院广州地球化学研究所135项目
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广东省科技计划项目
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文献收藏号
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CSCD:4864965
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