遥感技术在阿根廷西北部米纳皮基塔斯地区斑岩型铜金矿找矿调查中的应用

Application of remote sensing technology in prospecting and exploration of porphyry copper-gold deposits in Mina Pirquitas,Northwest Argentina

阿根廷西北部的铜金多金属成矿带是南美安第斯成矿带的主要组成部分。该成矿带主要发育斑岩型铜金矿,是阿根廷最主要的铜金多金属矿产资源分布区,但该区交通差、地形地质构造复杂、岩性多样,极大地影响了地质找矿的进展。以阿根廷西北部胡胡伊省的米纳皮基塔斯地区为研究区,以ETM+卫星影像为数据源,进行环形构造、菱形构造、深大断裂和破碎带的遥感解译;基于Aster遥感影像数据开展了成像光谱法和主成分分析法矿化蚀变异常信息提取分析。结果显示,铝羟基类蚀变矿物组合和铁染蚀变矿物异常区与主要控矿构造较一致,通过分析认为该区域成矿条件优越。在此基础上,结合斑岩型矿床成矿地质条件等资料,建立该地区遥感地质找矿模型,划分出了重要找矿远景区。该方法具有良好的找矿效果,对阿根廷西北部地区的找矿调查工作具有重要指导作用。

The copper-gold polymetallic metallogenic belt in northwestern Argentina is the main component of the Andean metallogenic belt in South America.This metallogenic belt mainly develops porphyry copper-gold deposits and is the main distribution area of copper-gold polymetallic mineral resources in Argentina.This paper focuses on the Minapiquitas region of Jujuy Province in northwestern Argentina,using ETM+satellite images as the data source,to carry out remote sensing interpretation of annular structures,rhombus structures,deep faults and broken zones;based on Aster remote sensing image data information extraction and analysis of mineralization alteration anomalies by imaging spectroscopy and principal component analysis.The results show that the anomalous area of aluminum-hydroxy-type altered minerals and iron-stained altered minerals is relatively consistent with the main ore-controlling structures,and it is considered that this area has favorable metallogenic conditions.On this basis,combined with the metallogenic geological conditions of porphyry deposits,a remote sensing geological prospecting model was established in this area,and important prospecting areas were divided.This method has a good prospecting effect and plays an important guiding role in the prospecting and investigation work in northwestern Argentina.