超基性岩的蛇纹石化和碳酸盐化耦合关系  

A Review of the Coupling Relationship Between Serpentinization and Carbonization of Ultrabasic Rocks

作　　者：孙泽祥 张明峰 王先彬 卓胜广[3] 宋董军 SUN Ze-xiang;ZHANG Ming-feng;WANG Xian-bin;ZHUO Sheng-guang;SONG Dong-jun(Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Key Laboratory of Petroleum Resources,Chinese Academy of Sciences/Key Laboratory of Petroleum Resources of Gansu Province,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;Northeastern University at Qinhuangdao,Qinhuangdao Hebei 066004,China)

机构地区：[1]中国科学院西北生态环境资源研究院,中国科学院/甘肃省油气资源研究重点实验室,兰州730000 [2]中国科学院大学,北京100049 [3]东北大学秦皇岛分校,河北秦皇岛066004

出　　处：《矿物岩石地球化学通报》2018年第6期1190-1197,共8页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金项目(41103022,41272146);中国科学院西部青年学者项目

摘　　要：大洋中脊超基性岩的蛇纹石化是普遍的地质过程,反应产生了蛇纹石、水镁石、磁铁矿等并释放氢,该过程可为洋中脊化能自养型微生物提供能量和生命物质,是生命起源主要的水岩变质反应。然而,在生命起源初期全球高浓度的CO2使超基性岩(包括科马提岩)同时发生蛇纹石化和碳酸盐化,这种情况下初始生命物质的产生机制与在洋中脊热液环境中截然不同。本文结合近年来有关超基性岩蛇纹石化和碳酸盐化的研究成果,系统介绍了贫CO2和富CO2条件下,超基性岩的蚀变机制、化学反应、蛇纹石化和碳酸盐化的耦合关系,以及氢气释放的有效途径及其制约因素,以增进对初始生命物质来源和生命起源演化的理解。Serpentinization of ultrabasic rocks in the mid-ocean ridge(MOR)is a common geological process during which serpentine,brucite,magnetite and other minerals are formed,and hydrogen is released.This process can provide energy and life matter for chemosynthetic microbial communities.It is main metamorphic hydration reaction in the origin of life. However,in the early stage of the life,high concentration of CO2 in global scale caused both serpentinization and carbonation of ultrabasic rocks (including komatiite).Thus,production mechanism of life matter under such condition is quite different from the MOR hydrothermal environment.Based on the recent studies on serpentinization and carbonation of ultrabasic rocks,the following aspects are introduced systematically in this paper:alteration and chemical reactions of ultraba- sic rocks under CO2-poor and CO2-rich,coupling of serpentinization and carbonation,and pathway and controlling factors of hydrogen release,which would enhance understanding of the generation of life matter and origin and evolution of life.

关 键 词：超基性岩 蛇纹石化 碳酸盐化 生命起源 

分 类 号：P588.125[天文地球—岩石学]