地球初期壳幔演化的物理过程  

Physical Process of Mantle-Crust Evolution in the Early Stage of the Earth

作　　者：王守旭[1] 张兴春[1] 陈衍景[1] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学重点实验室

出　　处：《地质论评》2006年第4期442-449,共8页Geological Review

基　　金：国家自然科学基金项目(编号40372049);中科院知识创新工程重要方向项目(编号KZCX3-SW-125)资助的成果

摘　　要：原始地幔处于全球性的高温熔融状态,其上层的冷却演化过程可大致分为3个阶段:高熔点矿物结晶沉降阶段、岩浆不混溶阶段和固化成壳阶段。在此过程中,原始地幔逸出挥发性物质,形成了地球的超临界流体圈。通过岩浆不混溶作用所形成的富Si-Al质岩浆最终固化为原始大陆壳。超临界流体圈的分解,分别形成酸性H2O圈和CO2大气圈。The primitive mantle of the earth was in a high temperature global melt state. The cooling-evolution process of the upper layer of the primitive mantle could be divided into 3 phases： （1） a phase of crystallizationaccumulation of minerals with high melting temperatures, （2） a phase of silicate liquid immiscibility and （3） a phase of melt solidification. During the process of the cooling-evolution ,volatile components were released from the primitive mantle to have formed the supercritical fluid sphere later. The magma rich in Si-Al, which were formed by silicate liquid immiscibility, were solidified to form the primary crust. The supercritical fluid sphere was then decomposed to have formed acidic hydrosphereand CO2 aerosphere respectively.

关 键 词：壳幔演化 原始地幔熔融体 岩浆不混溶作用 超临界流体圈 

分 类 号：P313.4[天文地球—固体地球物理学]