鄂东北大别杂岩中条带混合岩的质量平衡研究  

STUDY ON THE MASS-BALANCE OF STRIPPED MIGMATITES IN DABIE COMPLEX, NORTHEASTERN HUBEI

作　　者：王江海[1] 

机构地区：[1]中国科学院地球化学研究所,贵阳550002

出　　处：《岩石学报》1993年第1期20-32,共13页Acta Petrologica Sinica

基　　金：国家自然科学基金85040093;教委博士点基金09220582

摘　　要：采用质量平衡计算研究鄂东北大别杂岩中的条带混合岩的结果表明,浅色体为普通花岗岩和石英正长岩等的富钾混合岩是在开放体系中形成的;浅色体为石英闪长岩和英云闪长岩等的富钠混合岩可形成于封闭体系或开放体系,即本区不是所有的富钠条带混合岩都可由毗邻的古成体衍生而来。过剩质量计算表明,开放体系混合岩的形成是一个岩石中FeO和MgO降低,而SiO_2和K_2O升高的过程。The result of mass-balance calculation of the stripped migmatites indicates that the migmatite with high-potassium leucosomes was formed in a open system, and that the migmatite with high sodium leucosomes may equally be formed in both closed and open systems. The calculation of excess mass indicates that during the migmatization MgO and FeO were reduced and SiO_2 and K_2O were concentrated in the open system.

关 键 词：混合岩 质量 平衡计算 杂岩 

分 类 号：P583[天文地球—岩石学]