volcanism

The formation of auriferous stratawas controlled by volcanism and eustacy.

火山作用和海平面变化对含金层形了控制作用。

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.

原岩形于具有基性火山作用活动大陆边缘滨海-浅海环境。经过太古宙区域高角闪岩相变作用，形孔兹岩系。