西藏马扎拉矿区综合信息找矿模型建立与应用

Establishment of the comprehensive information prospecting model and application in Mazhala

马扎拉金锑矿是西藏藏南地区特提斯喜马拉雅成矿带上典型的受构造控制的蚀变岩型矿床.为了查明工作区控矿构造的空间展布以及为找矿评价提供依据,在前人总结的区域成矿模式的指导下,以物性为桥梁,将成矿模式转化为地质-地球物理模型,并以此模型为指导思想,综合分析了工作区地质资料和面积性的地球物理和地球化学资料,圈定了找矿有利的靶区,然后在靶区开展大比例尺的音频大地电磁测深和联合剖面测量工作.对音频大地电磁反演解译的断层进行了评价,推测与容矿相关的构造主要为F7、F12、Ft1、Ft2、Ft3.最后通过钻探对Ft1进行验证,成功发现了矿化破碎带.从而证明了综合信息找矿的合理性,为区内相似地质背景下的找矿工作提供了成功的经验.

The Mazhala gold antimony deposit, located in the Tethyan Himalaya metallogenic belt,is a typical altered rock type deposit controlled by faults. In order to find out the spatial distribution of the ore controlling structure and to provide the basis for prospecting evaluation, First of all, according to regional metallogenic model as a guide,With the characteristics of rock physical properties, metallogenic model was transformed into a geophysical model. By comprehensively analyzing the data of the working area, the favorable target areas for mineralization are delineated, Then, magnetotelluric sounding and the resistivity combined profiles meth are carried out in the target area. The faults of interpretation by audio magnetotelluric inversion are evaluated,speculated that F7,F12,Ft1,Ft2 and Ft3 are the main ore hosting structures. Finally, the Ft1 was verified by drilling, and the mineralized fracture zone was found successfully. It proves the rationality of comprehensive information prospecting,and provides successful experience for prospecting in similar geological background.