volcanism

The formation of auriferous stratawas controlled by volcanism and eustacy.

用和海平面变化对含金地层的形成起到了控制用。

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.

原岩形成于具有基性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用，形成孔兹岩系。