摘要
云南哀牢山岩群的中深变质岩系中产有蓝晶石、红柱石及矽线石等特征变质矿物。发现红柱石包绕蓝晶石边缘的反应冠状体等非平衡反应结构，结合其它低压变质矿物特征研究后认为：哀牢山岩群在元古变质旋回经历了中压区域变质向低压区域变质作用的动态转变。在元古变质旋回晚期，由于地壳隆升降压，相应发生了低压角闪岩相的区域变质，从而形成了红柱石、针状矽线石、硅灰石及堇青石等低压变质矿物。
AbstractThere are characteristic metamorphic minerals of kyanite, andalusite and sillimanite, etc, occurredin in the medium kata-metamorphic rock series of the Ailao Mountains rock group in Yunnan. The discovery of unequilibrated reaction structure, reaction corona of andalusite around kyanite, etc ,and the stydy of characteristics of other low P metamorphic minerals show that the Ailao Mts rock group experienced a dynamic transition from medium P regional metamorphism to high P one in the Proterozoic metamorphic cycle. In the late stage of the Proterozoic metamorphic cycle,the regional metamorphism of low P amphibolite facies took place because of the crust rising and depressurization, which formed the low P metamorphic minerals of andalusite, needle-like sillimanite, wollastonite and cordierite, etc.
出处
《云南地质》
1998年第2期168-174,共7页
Yunnan Geology
