柳树底矽卡岩型铜多金属矿找矿模式探讨

Discussion of prospecting models for Skarn copper polymetallic deposit in Liushudi

柳树底铜多金属矿床地处胶辽隆起带的太子河-浑江坳陷西部,是典型的矽卡岩铜矿床。在结合前人资料研究成果的基础上从其矿床地质特征、地球化学特征、矿床的成因等方面分析矿床的形成过程。从其铅、硫-氢氧稳定同位素组成反映成矿物质来源于岩浆,流体包裹体数据反映了该矿床为中高温热液矿床,成矿流体以岩浆水为主。在岩浆及构造作用下矿床经历了三次构造热蚀变及矿化作用,建立了该矿床为花岗斑岩与灰岩接触带矽卡岩型矿床的成矿模式,结合矿区内的低阻、高激化体地球物理电性特征进而建立了找矿模式。矿床地质环境为灰岩及侵入其中的花岗斑岩,加上近东西向构造岩浆活动带,矿床内高激化的物性特征,其指示矿体的分布,为寻找盲矿体提供了方向。

Liushudi copper polymetallic deposit is a typical skarn copper deposit,which is located in the western Taiz river-HunJiang depression,Jiaoliao uplift belt.Based on the combination of previous data,the paper analysed the process of forming deposit from its geological features of ore deposit,geochemical characteristics and the genesis of ore deposit etc.Stable isotope composition of lead,sulfur,hydrogen and oxygen refect the ore-forming material is derived from magma,fluid inclusion data reflects the deposit is a meso-hypothermal deposit,ore-forming fluid mainly from magmatic water.The deposit had experienced three times of tectonic thermal alteration and mineralization by the influence of magmatism and tectonism.We established skarn deposit metallogenic model,which is in the contact zone between the granite porphyry and limestone.The author establish the prospecting model for the kind of deposits,which is based on the geophysical electrical features of the geological bodies with lowr resistivity and higher activation.