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.
出处
《地质论评》
CAS
CSCD
北大核心
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
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
mantle-crust evolution
primitive mantle melts
liquid immiscibility
supercritical fluid sphere