辽宁小汪沟铁矿床地质特征及找矿前景分析

GEOLOGIC CHARACTERISTICS AND PROSPECTIVE POTENTIAL OF THE XIAOWANGGOU IRON DEPOSIT IN LIAONING PROVINCE

小汪沟铁矿位于寒岭断裂、灯塔弧形断裂及石桥子断裂控制的近三角形构造框架内,区内构造发育,岩浆岩分布极广.由于深变质作用程度的不均一性,太古宇鞍山群茨沟组地层呈残留体形式分布在混合花岗岩中,矿体赋存在残留体中.区内主要有两条较大的矿体,大部分隐伏在混合花岗岩中,少量露出地表.围岩及矿体内部绿泥石化、阳起石化、白云母化、绢云母化等蚀变较为常见.通过对铁矿床区域地质背景、矿床地质特征以及矿床成因类型研究,分析矿(化)体形态、分布、延伸、成因等特征,认为该区仍具有较大的找矿潜力.

The Xiaowanggou iron deposit is located in a nearly triangular area controlled by Hanling fault,arcuate Dengta fault and Shiqiaozi fault,with developed structure and broad distribution of magmatic rocks.Due to the inhomogeneity of the hypometamorphism,the Archean Anshan group Cigou formation is distributed in the migmatitic granite in the form of residues,in which ore bodies occur.There are two large ore bodies,most of which are buried in the migmatitic granite,less exposed in the surface.Chloritization,actinolitization,muscovitization and sericitization are common in the wallrocks and the orebodies.Study of the regional geology,deposit geology and genetic types of the deposit and analysis on the characteristics of the form,distribution,extension and genesis of the ore（mineralized） body show a great prospective potential of exploration in this area.