甘肃北山榴辉岩矿物特征及温压条件  

MINERAL CHARACTERISTICS AND TEMPERATURE-PRESSURE CONDITIONS OF BEISHAN ECLOGITE,GANSU PROVINCE

作　　者：于海峰[1] 梅华林[1] 陆松年[1] 李铨[1] 

机构地区：[1]中国地质科学院天津地质矿产研究所,天津300170

出　　处：《长春科技大学学报》1999年第2期110-115,共6页Journal of Changchun University of Science and Technology

基　　金：原地质矿产部"九五"资源与环境科技攻关项目!950201102

摘　　要：甘肃北山榴辉岩中矿物组合形成于四个不同阶段：（１）以柯石英为代表的早期超高压阶段，（２）以绿辉石＋石榴石平衡共生组合为代表的主期高压阶段，（３）以单斜辉石＋角门石＋斜长石交生组合为代表的晚期较高压退变阶段，（４）以绿泥石＋绿帘石＋科长石为代表的后期叠加阶段。前三个阶段反映了相辉岩相变质作用的主要过程。后一阶段，反映了榴辉岩在地壳浅部层次绿片岩相环境下遭受轻微的叠加改造。The mineral assemblages of the Beishan eclogites, Gansu Province, are formed in fourdifferent stages: (1)the earlier super--high pressure stage represented by the exist of coesite, (2) themain high pressure stage represented by the equilibrium paragenesis of garnet and omphacite, (3)thelater high pressure retrogresive stage represented by the symplectitic assemblage of clinopyroxene +hornblende+plagioclase around the earlier omphacite and garnet, (4)the latest superimposed stage represented by the assemblage of chlorite+episode+plagioclase. The former three stages reflect the majorprocess of eclogite factes metamorphism and the latest stages the light overprinting of greenschist faciesretrometamorphism at the shallow level of crust.

关 键 词：榴辉岩 矿物特征 温压条件 甘肃北山 

分 类 号：P588.3[天文地球—岩石学]