山西省耿庄金银矿区隐爆角砾岩研究

晋东北地区出露一系列与燕山期富碱的酸性、中酸性浅成相-次火山相有成因联系的爆破角砾岩筒。耿庄金银矿区隐爆角砾岩筒是其中较典型且研究较详的实例之一。它位于两条断裂交叉处,平面上呈似椭圆状,纵剖面上呈不对称的漏斗状,岩筒中心直径约为150m,延深600m以上。该岩筒由四种成因类型包括七种不同成分的角砾岩组成,它们在水平上大致呈环状分布。角砾岩筒的隐蔽爆破作用至少发生过两次。主要的矿化作用产生在第二次爆破作用之后,形成了一个含Pb、Zn、Cu等的多金属金银矿床。

A STUDY OF THE HIDDEN EXPLOSIVE BRECCIAS AT GENGZHUANG GOLD-SILVER DISTRICT OF SHANXI PROVINCE

A series of explosive breccia pipes, related to acid rich-alkaline subvolcanic rocks of Yanshan period in origin, occur in the Northeast Shanxi Province. Gengzhuang breccia pipe is one of them as a well studied and a typical pipe. It is elliptic in plan and unsymmetrical funnel-shaped in vertical section, with a diameter up to 150m and a depth more than 600m at centre. The zoning pipe consists of seven types of breccias. There is a certain affiliation between some breccias and host rocks, and mosaic texture among the breccias. At least two explosion related to the pipe formation raked place. The main mineralization was followed by the secondary explosion, forming a medium gold-silver deposit with Pb, Zn, Cu, and controlled by the secondary annular-liked fractures within the breccia pipe and by the breccias.