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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。
Metamorphic minerals such as kyanite, andalusite, and sillimanite are intermediately produced in the middle-deep metamorphic rocks of the Ailao Mountain Group in Yunnan Province. It is found that the non-equilibrium reaction structure such as corolla of the andalusite encircling the edge of kyanite combined with the characteristics of other low-pressure metamorphic minerals suggests that the metamorphic cycle of the Ailao Mountain metamorphic to the metamorphism in the low-pressure area The dynamic change. In the Late Proterozoic metamorphic cycle, due to the uplift and depressurization of the crust, the regional metamorphism of the low-pressure amphibolite facies occurred correspondingly, and low-pressure metamorphic minerals such as andalus, acicular sillimanite, wollastonite and cordierite were formed.