墨西哥湾GC238区冷泉碳酸盐岩的微结构与石化微生物特征

永颉同心

摘　要：采于墨西哥湾GC238海底天然气渗漏区浅表层的冷泉碳酸盐岩呈结核状产出,由方解石微晶和胶结物及少量的黄铁矿构成.胶结物由直径为0.1～0.5 m的方解石化的球体、卵形体、棒状体组成,充填于方解石晶体之间.冷泉碳酸盐岩结核下表面发育有由方解石化的球体、卵形体、棒状体组成的薄层,其中的一些球状集合体(约5 m)断面显示发育有核和外壳的层圈结构.黄铁矿呈草莓状,也具有相似的层圈结构.这种层状结构与活体古细菌被硫酸盐还原细菌包裹的层圈结构相似.样品中所保存的球体、卵形体、棒状体及其所组成的层圈结构可能是石化的甲烷氧化古细菌和硫酸盐还原细菌.
关键词：冷泉碳酸盐岩;微结构;甲烷氧化古细菌;硫酸盐还原细菌;墨西哥湾

基金项目：中国科学院知识创新工程重要方向项目(KZCX2-YW-108和KZCX3-SW-224);国家自然科学基金项目(批准号:40472059);中国科学院知识创新工程前沿领域项目(GIGCX-04-03)资助.
作者简介：管红香 女 1981年出生 硕士研究生 冷泉沉积和生物标志化合物研究
作者简介：陈多福,通讯作者
作者单位：管红香（中国科学院广州地球化学研究所边缘海地质重点实验室,广州,510640;中国科学院研究生院,北京,100049）　
　　　　　陈多福（中国科学院广州地球化学研究所边缘海地质重点实验室,广州,510640）　
　　　　　Cathles L M（Department of Earth & Atmospheric Sciences, Cornell University, Ithaca, New York 14853, USA）　
　　　　　Roberts H H（Coastal Studies Institute, Louisiana State University, Batton Rouge, LA 70803, USA）　
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