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。根据变质程度差异可划分出6个变质带：矽线石带．蓝晶石带，十字石带，石榴子石带，黑云母带和绢云母一绿泥石带。蓝晶石带十字石片岩和石榴子石带斜长角门岩与变玄武岩的矿物Rb一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。
Danba area has undergone multiperiod deformation, metamorphism and magmatism since Mesozoic time. Six belts of metamorphic factes have been established, i.e., the silllmanite, kyanitc, staurolite, garnet, biotite and sericite-chlorite belts. Rb -Sr isochron ages for staurolitc schist in kyanite belt and plagio-amphibolite and metabasalt in garnet belt arc 149. 0±7. 1 Ma, 160. 0±13. 0 Ma and 150.2±2. 4 Ma, respectively. They arc considered to represent the most principal ages of reginal dynamothermal metamorphic event in Danba area. With reference to available geochronological data, the metamorphic history in Danba area is also discussed.
出处
《高校地质学报》
CAS
CSCD
1997年第4期379-383,共5页
Geological Journal of China Universities
基金
国家自然科学基金!49573171
国家教委博士点基金!9528405
关键词
变质岩
年代学
铷
锶
年代学
同位测年
Rb-Sr isochron, regional dynamothermal metamorphism, Danba area
