桓仁地区金属矿床特征及其找矿方向初步探讨

Preliminary study of metal deposit characteristics and prospecting direction in Huanren area,Liaoning Province

桓仁地区位于辽宁省东部,大地构造位置处于辽东台背斜太子河浑江古坳陷的东端,北邻铁岭―靖宇古隆起,南部与营口―宽甸古隆起毗邻。区内构造异常复杂,各期构造活动均有不同程度的表现,有吕梁期、加里东期、海西期、燕山期等,其中燕山期构造活动尤为突出。区内矿产主要为铜铅锌多金属矿床,类型分为矽卡岩型及热液型两类。矽卡岩矿床呈EW向分布于燕山期侵入岩体周围;热液型矿床主要分布于酸性-碱性侵入体的两侧,呈NE向分布;钼矿不仅呈NE向分布于酸-碱性岩脉两侧,还充填于节理裂隙中。

Huanren area is located in the east part of Liaoning Province. The tectonic position is in the east end of Taizi River Hunjiang ancient depression of Liaodong anticline. Tieling - Jingyu ancient uplift is in the north, whereas the Yingkou - Kuandian paleouplift adjacent is in the south. The regional structure feature is very complex, with tectonic activity of varying degrees in different periods, such as Lvliang period, Caledonian period, Hercynian period and Yanshan period. The tectonic activity is particularly prominent among Yanshan period. The major mineral resources in the area are Cu-Pb-Zn polymetallic deposits, divided into skarn and hydrothermal types. Skarn type deposits are distributed around Yanshan intrusive rocks in east-west direction. Hydrother- mal type deposits are located in the both sides of acidic or alkaline intrusive body in northeast-trending distri- bution. The molybdenum deposit is not only distributed in both sides of acid - alkaline dike, but also filling within the joint fractures.