川西丹巴地区变质岩的Rb—Sr年代学研究

川西丹巴地区变质岩的Rb—Sr年代学研究

沈渭洲徐士进王汝成钟宏林雨萍骆耀南侯立玮

[1]南京大学地球科学系 [2]四川省地质矿产局

收稿日期:1997-12-20 修回日期:1997-12-20 出版日期:1997-12-20 发布日期:1997-12-20

Rb-Sr CHRONOLOGICAL STUDY OF METAMORPHIC ROCKS IN DANBA AREA, WESTERN SICHUAN PROVINCE

Shen Wei-zhou1, Xu Shi-jin1, Wang Ru-cheng1, Zhong Hong1, Lin Yu-ping1, Luo Yao-nan2, Hou Li-wei2

1. Department of Earth Sciences, Nanjing University, Nanjing 210093; 2. Sichuan Bureau of Geology and Mineral Resources, Chengdu 610082

Received:1997-12-20 Revised:1997-12-20 Online:1997-12-20 Published:1997-12-20

摘要/Abstract

摘要： 丹巴地区自中生代以来经历了多期的变形、变质和岩浆作用。根据变质程度差异划分出6个变质带：矽线石带、蓝晶石带、十字石带、石榴子石带、黒云母带和绢云母－绿泥石带。蓝晶石带十字石片岩和石榴石带斜长角闪岩与变玄武岩的矿物Rb－Sr等时线年龄分别为149.0±7.1Ma，160.0±13.0Ma和150.2±2.4Ma，它们代表该区最主要的一次区域动热变质事件年龄。本文还结合已有的年代学资料，讨论了丹巴地区变质作用演化史

Abstract: Danba area has undergone multiperiod deformation, metamorphism and magmatism since Mesozoic time. Six belts of metamorphic facies have been established, i.e., the sillimanite, kyanite, staurolite, garnet, biotite and sericite-chlorite belts. Rb-Sr isochron ages for staurolite schist in kyanitc belt and plagio-amphibolite and metabasalt in garnet belt are 149.0±7.1 Ma, 160.0±13.0 Ma and 150.2± 2.4 Ma respectively. They are considered to represent the most principal ages of reginal dynamothermal metamorphic event in Danba area. With reference to available Re0chr0n0i0gical data, the metamorphic history in Danba area is also discussed.

沈渭洲徐士进王汝成钟宏林雨萍骆耀南侯立玮. 川西丹巴地区变质岩的Rb—Sr年代学研究[J]. J4.

Shen Wei-zhou1, Xu Shi-jin1, Wang Ru-cheng1, Zhong Hong1, Lin Yu-ping1, Luo Yao-nan2, Hou Li-wei2. Rb-Sr CHRONOLOGICAL STUDY OF METAMORPHIC ROCKS IN DANBA AREA, WESTERN SICHUAN PROVINCE[J]. J4.