东海超高压变质带花岗质片麻岩的岩石学及其成因特征  

Petrology and Genetic Mechanism of Granitic Gneiss in Donghai Ultrahigh-pressure Metamorphic Belt

作　　者：刘福来[1] 许志琴[1] 徐惠芬[1] 

机构地区：[1]中国地质科学院地质研究所,北京100037

出　　处：《地质论评》1999年第S1期636-644,共9页Geological Review

基　　金：原地质矿产部"九五"科技攻关项目"大别造山带形成与演化及有关成矿作用"部分成果

摘　　要：东海地区的花岗质岩石主要由二长花岗质片麻岩、角闪碱长花岗质片麻岩和霓石二长花岗质片麻岩组成。根据该类岩石区域产状、化学成分、稀土和微量元素特征,结合前人理论和实验资料,确定研究区花岗质片麻岩是由云母片麻岩类岩石,在超高压变质作用峰期(M_2)及近等温减压初期阶段(M_3),于相对富水流体体系中经深熔作用而成。该项研究对于深入探讨苏鲁超高压变质带变质作用-岩浆作用相互间的成因关系及其动力学过程有着重要的科学意义。The granitic gneiss mainly consists of monzogranitic gneiss, amphibole alkali granitic gneiss and aegirine-bearing monzogranitic gneiss in the Donghai area. According to their characteristics of occurrence, chemical composition, trace elements and rare earth elements ,and combined with previous theoretical and experimental data, the granitic gneiss was formed by anatexis of mica gneiss at the ultrahigh pressure metamorphic peak stage(M_2) and the isothermal decompressional stage (M_3) under the relative H_2O-rich fluid system. This research may have an important significance to an in-depth study of the genetic relationship between metamorphism and granitic magma generation and its geological dynamics in the Su-Lu (Jiangsu and Shandong Province) ultrahigh pressure metamorphic belt.

关 键 词：花岗质岩石 深熔作用 成因 超高压变质带 东海 

分 类 号：P588.3[天文地球—岩石学]