Archean

Its original rock is sedimented in the environment of active epicontinent-seaboard with basic volcanism, and become khondalite series through the Archean regional high-amphibolite facies metamorphism.

岩形成于具有基火山作用的活动大陆边缘滨海-浅海环境。经过太古宙的区域高角闪岩相变质作用，形成孔兹岩系。