新疆谢米斯台地区小岩体型矿化遥感探测

Remote Sensing Detection of Mineralization Related to Small Intermediate-acid Intrusions in Xiemisitai Area,Xinjiang

中酸性小岩体易被地质填图遗漏,严重制约了该类型矿化的发现。在新疆西准噶尔谢米斯台地区找矿工作中,首先利用ETM+数据进行小岩体扫面,进而选取重点区采用ETM+和中巴资源卫星02B HR数据进行分辨率融合后解译、识别中酸性小岩体,并利用主成分分析法提取蚀变遥感异常,结合地质、化探信息综合分析后确定重点检查区域。利用此方法共解译出14个钾质花岗岩和3个黑云母花岗岩小岩体,这些小岩体大多被野外检查所证实。经野外检查发现了5处铜、金矿化点,证实了该方法的有效性。本研究中采用的方法可以为西部地区地质填图和中酸性小岩体型矿产资源勘查提供借鉴。

The small acid-intermediate intrusion is often ignored because of its small size and the large distance between two adjacent survey routes for geological mapping. This has seriously restricted the discovery of the relevant mineralization. During the mineral exploration in Xiemisitai area of west Junggar Basin,Xinjiang,a remote sensing-dominated method was used for targeting of small intrusion-related deposits. First,ETM＋ data were used for reconnaissance of small intrusions. In the selected area,ETM＋ data and CBERS-02 B HR were fused to identify small intrusions. Then,remote sensing anomalies were delineated by using the principal component analysis. The targets were selected based on synthetic analysis of remote sensing results,geological data and geochemical anomalies. Fourteen small potash-feldspar granites and three hornblende biotite granites were interpreted and most of these small intrusions were confirmed in the field. Five Cu and Au mineralization spots were discovered for the first time,which confirmed the validity of this method. These methods are recommended for lithologic mapping and small intrusion-related mineral resources targeting in the sparse vegetation arid regions of northwestern China.