南海北部冷泉碳酸盐岩层状结构及其地质意义

THE LAYER STRUCTURE AND ITS GEOLOGICAL SIGNIFICANCE OF SEEP CARBONATES IN THE NORTH OF SOUTH CHINA SEA

  • 摘要: 通过对南海北部冷泉碳酸盐岩的结构进行研究,发现了3种不同的层状结构:结核状碳酸盐岩的微纹层和烟囱状碳酸盐岩平行及垂直烟囱壁的层。不同层的微结构、化学成分、矿物等方面的研究结果表明:结核状碳酸盐岩层的各个微纹层在结晶程度、矿物形态、孔隙度等方面不同,但化学成分变化不大;对于烟囱状碳酸盐岩,与烟囱壁平行的内外层之间矿物、成岩程度等不同,垂直烟囱壁的不同层之间碳酸盐矿物含量不同。碳酸盐岩不同的层状结构是其形成时地质、物理、化学和生物等信息的反映,对于恢复其形成时的古环境具有重要意义。

     

    Abstract: From studies on the methane seep carbonates, three different layer structures among them are found. Micro-structure, chemical components and minerals have been researched. The results show that the carbonate nodules have different microstructures, but the chemical components have no great changes. The carbonate chimneys have two layer types.one is parallel to the chimney wall, which has different min-erals and lithification, and the other is perpendicular to the chimney wall, which has different carbonate mineral contents. The different layers reflect the changes of geology, geophysics, geochemistry and biology when the carbonate formed, so it is helpful to reconstruct the paleoenvironment.

     

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