秘鲁南部斑岩铜矿典型蚀变带矿物信息提取及找矿远景区圈定

Information Extraction of Typical Alteration Zone of Porphyry Copper Deposit and Delineation of Prospective Areas in Southern Peru

不同斑岩铜矿的构造地质、成矿时代和控矿因素具有其特殊性,所以需要针对具体的矿区开展地质调查以获取矿区标志性蚀变矿物组合信息,从而利用遥感技术手段提取矿区蚀变信息,确定找矿远景区.通过综合分析秘鲁南部斑岩铜矿地质特征、控矿因素,确立了以泥化-绢英岩化和青磐岩化组合蚀变矿物带为遥感找矿指示标志,并以ASTER数据为遥感数据源开展蚀变矿物信息提取技术研究,结合已有矿区地质资料、高光谱影像和实地勘查结果,验证了典型蚀变带矿物信息提取结果的可靠性,另圈定了2处找矿远景区.在综合分析、梳理已有研究基础上,构建了多光谱遥感找矿模式,并在智利、阿根廷等其他多个斑岩铜矿区取得了较好的应用效果.

Every porphyry copper deposit has different geological structure,metallogenic epoch and ore controlling factors.Therefore,it is necessary to carry out geological investigation to obtain the information of the iconic alteration mineral assemblage to extract the alteration information by using remote sensing technology and determine prospective areas.A comprehensive analysis of geological characteristics and ore controlling factors of porphyry copper deposit in southern Peru is carried out in this study.The combined information of argillic-and phyllic-alteration and propylitic alteration is established as the ore prospecting indicator and the technology of alteration information extraction is explored with ASTER data.Combined with existing mining geological data,hyperspectral image and field survey results,alteration extraction results are confirmed as reliable and effective and the other two prospective areas are delineated.The multi-spectral remote sensing prospecting model is constructed and its application proves successful in other porphyry copper districts such as Chile,Argentina.