辽宁宏达-李家堡子金矿床地质特征及找矿标志

宏达-李家堡子金矿床是产于清原太古宙早期混合花岗岩破碎蚀变带中的中低温岩浆期后热液金矿床.矿床赋存于北东向大断裂的次级构造中，赋矿围岩为太古宙混合花岗岩，围岩蚀变为一套中低温热液蚀变组合，主要有硅化、高岭土化、绿泥石化、绢云母化、方解石化.矿体的形成与太古宙混合花岗岩以及印支期花岗岩的多期次“脉动式”侵入有关，尤其与印支期花岗岩关系密切.通过总结矿床地质特征、分析控矿因素、确定找矿标志，认为断裂构造、太古宙混合花岗岩及中生代印支期花岗岩是该矿床的重要控矿因素，可以利用构造特征、表生氧化特征和蚀变特征等找矿标志对研究区及外围进行找矿预测.

GEOLOGICAL CHARACTERISTICS AND PROSPECTING INDICATORS OF THE HONGDA-LIJIAPUZI GOLD DEPOSIT IN LIAONING PROVINCE

The Hongda-Lijiapuzi gold deposit, occurring in the altered fracture zones in the early Archean migmatitic granite in Qingyuan, Liaoning province, belongs to post-magmatic epi-mesothermal type. The deposit is hosted in the secondary structures of NE-trending faults, with wall rock of Archean migmatitic granite. The wallrock alteration is a suit of epimesothermal alteration assemblage, including mainly silicification, kaolinization, chloritization, sericitization and calcitization. The formation of ore bodies is related to the multiple pulsating invasions of Archean migmatitic granite and Indosinian granite, especially closely with the latter. Study on the geological characteristics, ore-controlling factors and prospecting indicators shows that the fault structures, Archean migmatitic granite and Indosinian granite should be the main controlling factors for this deposit. The structural features, supergene oxidation and alterations can be used as prospecting indicators in the studied area and peripheral district.