南海北部冷泉碳酸盐岩矿物微形貌及其意义探讨  

Minerals' Micro-Shape and Its Significance of Seep Carbonates in the North of the South China Sea

作　　者：杨克红[1,2] 初凤友[1] 赵建如[1] 雷吉江[1] 方银霞[1] 

机构地区：[1]国家海洋局第二海洋研究所海底科学重点实验室,浙江杭州310012 [2]中国科学院边缘海地质重点实验室,中国科学院南海海洋研究所,广东广州510301

出　　处：《矿物学报》2009年第3期345-352,共8页Acta Mineralogica Sinica

基　　金：国家海洋局青年基金(2008313);国家海洋局第二海洋研究所基本科研业务专项(JG0708);中国科学院边缘海地质重点实验室(MSGL0708)

摘　　要：主要通过南海北部冷泉碳酸盐岩的扫描电子显微镜观察,发现该区结核状碳酸盐岩具有微孔结构,这些微孔可能是甲烷渗漏的通道,并且结核状碳酸盐岩矿物堆积较为紧密;碳酸盐矿物的微形态呈近菱形、菱形、球状、丝状、短柱状、卵状等形态或集合体,其中球状碳酸盐具有微生物结构,由蠕虫状或丝状矿物组成,其他几种微形貌的碳酸盐矿物由纳米级的微晶颗粒组成。碳酸盐集合体微形貌和微晶颗粒在形态和大小上与甲烷氧化古细菌和硫酸盐还原菌差别较大,由此推测在其沉淀过程中这两种细菌可能只是提供了物质基础,而其沉淀作用则与纳米细菌密切相关。在南海北部冷泉碳酸盐岩中还发现了结晶程度不同的碳酸盐矿物连续生长的现象,以及一些未知的蘑菇状和管状矿物。The seep carbonates were studied mainly by SEM and some characteristics were described. The nodule carbonates have micro-cavity structures, which may be the channels for seep methane. Minerals in the nodule carbonates were deposited closely as compared with other types of carbonates. The minerals are variable in micro-shape, for instance rhombus-like, rhombus, spheroid, filament, rod-shaped and spawn. The spheroid carbonates exhibit microbial structure, which were formed by some minerals like warms or filament. The other types of carbonates are composed of nanometer-sized microlite grains. The carbonate aggregates and microlite grains are different from the methane-oxidizing Archaea（MOA） and the sulfate-reducing bacteria（SRB） in shape and size, so it is speculated that perhaps the methane-oxidizing Archaea（MOA） and the sulfate-reducing bacteria（SRB） only offer the matter and that the nanobacteria play an important role during the carbonate precipitating. In the seep carbonates in the north of the South China Sea we have found the phenomenon of continuous growth of minerals differing in crystalinity and some minerals mushroom- or tube-shaped minerals.

关 键 词：冷泉碳酸盐岩 矿物 微形貌 南海 

分 类 号：P571[天文地球—矿物学] P578.4[天文地球—地质学]