| 南海北部深海甲烷冷泉自生碳酸盐岩显微结构特征与流体活动关系初探 |
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| 引用本文： | 苏新,陈芳,陆红锋,黄永样.南海北部深海甲烷冷泉自生碳酸盐岩显微结构特征与流体活动关系初探[J].现代地质,2008,22(3):376-381. |
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| 作者姓名： | 苏新 陈芳 陆红锋 黄永样 |
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| 作者单位： | 1. 中国地质大学海洋学院,北京,100083
2. 广州海洋地质调查局,广东广州,510760 |
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| 摘 要： | 对2002年"海洋四号"在南海北部深水冷泉活动区水深约3000m海底获得的1块自生碳酸盐岩展开了岩石学、地球化学和显微结构的分析研究。结果表明,该HD-83站位岩石样品为有多孔不规则块体,属于与扩散流有关的冷泉自生碳酸盐岩。其自生碳酸盐矿物成分为镁方解石或文石,含量达全岩的17%。全岩碳同位素值δ13C为-61.403‰,氧同位素值δ18O为3.5606‰,属于甲烷冷泉喷口成因自生碳酸盐岩,甲烷来源以微生物成因为主。该岩石显微结构有泡孔状、充填通道、不规则裂隙、虫孔边缘加厚4种主要类型。通过对比,推知这些显微结构可能与甲烷分解排气释放或流体逃逸通道有关。本研究注意到在岩石的裂隙或孔道中菌丝体普遍存在,可能属于菌席的组成份子,依靠通道内流体进行化能合成。
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| 关 键 词： | 甲烷冷泉自生碳酸盐岩 显微结构 流体 菌丝 南海 |
Micro-textures of Methane Seep Carbonates from the Northern South China Sea in Correlation with Fluid Flow |
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| SU Xin,CHEN Fang,LU Hong-feng,HUANG Yong-Yang.Micro-textures of Methane Seep Carbonates from the Northern South China Sea in Correlation with Fluid Flow[J].Geoscience——Journal of Graduate School,China University of Geosciences,2008,22(3):376-381. |
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| Authors: | SU Xin CHEN Fang LU Hong-feng HUANG Yong-Yang |
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| Abstract: | A small piece of carbonate concretion collected by research vessel "Haiyang 4" from about 3,000 m seafloor of northern South China Sea was analyzed.The piece of carbonates was identified as methane seep carbonate with 17% magnesium calcites and δ13C value of-61.403‰ and δ18O value of 3.560,6‰.The carbonate shows four micro-textures derived by methane degassing,fluid flow and organisms activities.Calcite rings occur commonly along the walls of vesicles.Inner walls of burrow(worm tubes)are also coated by carbonate rims.Bacterial filaments were found in the fractures or conduits of carbonate,which depended on the methane-rich fluid to survive.Fluid conduits and fractures were often filled by coarser sands,which resulted from fluid flow escaping along these conduits. |
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| Keywords: | methane seep carbonate micro-texture fluid bacterial filament South China Sea |
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