陕西洛南马河钼矿地质特征及找矿远景分析

Geological Characteristics and Metallogenic Prospect of the Mahe Molybdenum Depositin Luonan County, Shaanxi Province

洛南马河钼矿位于北秦岭加里东褶皱带之纸房-永丰褶皱束中。矿区出露地层主要为元古代一套经多期变质作用和岩浆侵入活动影响的变质岩系，不同方向的断裂构造极为发育，构造活动强烈，燕山期花岗岩体广为出露。矿体主要分布于岩体外接触带附近北宽坪群长英质片岩中，明显受赋矿地层、构造及岩浆活动的影响，并与桃官坪穹隆构造有密切关系。从矿区地质特征和矿床成因分析，该钼矿属岩浆期后高—中温热液矿床，经进一步工作，有望形成中型矿床规模。

The Mahe molybdenum deposit in Luonan county is located in the Caledonian Zhifang-Yongfeng folds belt in the Northern Qinling Orogenic Belt. There are a series of metamorphic rocks developed in the region. The rocks were subjected to multi-phased deformations and metamorphisms, and also intruded by magmatic intrusions as well. Faults in different striking are developed well. The Yanshan granitic plutons can be seen everywhere. Orebodies mainly occur in feldspathic schists of the Beikuanping group near the exocontact of magmatic intrusions. Besides the ore deposits are obviously controlled by strata, structures and magmatic bodies, they are also related to the Taoguanping dome structure. Based on geological characteristics, the molybdenum deposit probably belongs to post-magmatic hydrothermal deposit in high-middle temperature. It can be predicted that the deposit would be developed into a middle scale through further prospecting and exploration work.