吉南古元古代集安群泥质变质岩P—T—t轨迹及其地质意义  

ON THE P T t PATH PELITIC METAMORPHIC ROCKS OF PLEAOPROTEROZOLC,JI'AN GROUP IN THE SOUTHERN PART OF JILIN PROVINCE AND ITS GEOLOGLCAL SIGNIFICANCE

作　　者：邵建波 毕守业 关灵芝 

机构地区：[1]吉林省地质科学研究所

出　　处：《吉林地质》1995年第1期50-56,共7页Jilin Geology

摘　　要：吉南古元古代分布区大地构造划分为辽吉裂谷系和浑江裂陷槽。集安群是辽吉裂谷系早期产物。泥质变质岩呈北东向分布于裂谷带内，经历了形成期后的中高级变质作用。本文在岩石建造、地质构造等研究基础上，通过变质作用研究，利用变质石榴石环带分析方法，建立了集安群泥质变质岩Ｐ—Ｔ—ｔ轨迹。该轨迹表明集安群形成以来经历了两次拉张变质作用。在变质作用动态过程中，泥质原岩发生变质变形。Ｐ—Ｔ—ｔ轨迹反映了该区古元古代地质演化历史。he geotectonics of Paleaoproterozoic distributive provhce in the southern part of Jilinprovince can be divided in Liaoji rift system and Hunjiang aulacogen.Ji’an Group is an earlyproduct of the Liaoji rift system. The pelitic metamorphic rocks are distributed within the riftzone with the NE strike and underwent intermediate-high metamorphism. In this paper,onthe basis of researching rock formation ,geological structure,and metamorphism,as well asby using analytic method of metamorphic garnet zoning,the p-T-t path of Ji’an Group peliticmetamorphic rocks is established.The path shows that it has undergone two phases since Ji’an Group was formed.The path reflects Paleaoproterozoic evolutionary history in the southern part of Jilin province.

关 键 词：PT轨迹 石榴石 集安群 变质岩 泥质变质岩 

分 类 号：P588.3[天文地球—岩石学]