辽宁省下峪铁矿床地质特征及找矿标志

Geological characteristics and clues for prospecting of Xiayu iron deposit in Liaoning

下峪铁矿床为沉积变质型铁矿。矿区岩浆活动较强,太古界鞍山群地层呈残留体形式分布在变质深成侵入体中,磁铁矿体赋存于鞍山群地层中,为斜长角闪岩中的夹层—磁铁石英岩。区内共圈出8条磁铁矿体,其中有7条出露地表。矿体普遍具绿泥石化、绢云母化、黄铁矿化及黄铜矿化。文章在详细研究矿床地质特征及地球物理特征的基础上,总结了该矿床的主要控矿因素及找矿标志,为进一步在该区找矿指明了方向。

Xiayu iron deposit is a metamorphosed sedimentary iron deposit.Magmatic activity is relatively in-tense in this area,thus the formation of Archaean Anshan Group distributes in form of residue inside the metamorphic plutonic intrusive body,and magnetite orebodies occur in Anshan Group formation as interlayer magnetite quartzite inside amphibolite.In the area eight magnetite orebodies are blocked,and seven of the orebodies outcrop.The orebodies are pervasively characterized by chloritization,sericitization,pyritization and chalcopyritization.Based on the integrated study of the geological and geophysical characteristics of the deposit,this paper summarizes the maj or ore-controlling factors and clues for prospecting in the deposit,and provides a clear direction for further prospecting works in this area.