volcanism

1.The formation of auriferous stratawas controlled by volcanism and eustacy.

火山作用和平面变化对含金地层的形成起到了控制作用。

2.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火山作用的活动大陆边缘-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。