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.
出处
《长春科技大学学报》
CSCD
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
关键词
榴辉岩
矿物特征
温压条件
甘肃北山
eclogite
mineral characteristics
temperature--pressure condition
Beishan area of Gansu Province
