新疆加甫沙尔苏地区中酸性小岩体型矿化蚀变遥感异常提取与找矿

Remote Sensing Extraction of Intermediate-acid Small Intrusions Related Alteration Anomalies and Mineral Exploration in Jiafushaersu Area,Xinjiang

中酸性小岩体的内部及附近的围岩中常形成与岩浆岩体有关的大型、超大型矿床,已成为找矿工作的一个重点方向。由于地质工作程度的限制,中酸性小岩体易被遗漏,严重制约了该类型矿化的发现。在新疆西准噶尔达尔布特断裂带下盘加甫沙尔苏地区找矿工作中,通过综合分析,提出了以遥感手段为主导的中酸性小岩体型矿化找矿模型:利用ASTER数据,通过图像增强处理、图像解译识别中酸性小岩体并提取蚀变遥感异常,结合地质、化探信息综合分析后确定重点检查区域。野外检查发现了加甫沙尔苏斑岩型钼矿化点,证实了该方法的有效性。该方法可以为西部地区中酸性小岩体型矿产资源勘查提供借鉴。

Superlarge and large magmatic deposits have frequently been discovered in the wail rock near the small intermediate-acid intrusions. Therefore, small intermediate-acid intrusion-related deposit is a great di- rection for ore exploration. However, small intermediate-acid intrusions were often omitted because of the low level of geologic research which seriously restricted the discovery of the relevant mineralization. During the mineral exploration at Jiafushaersu area, foot wall of Darbut Suture, West Junggar, Xinjiang, a mineral exploration model dominated by remote sensing technique was constructed for small intermediate-acid in- trusion-related deposits. In this model, through ASTER data-based image processing and interpreting, small intermediate-acid intrusions were identified. Furthermore, remote sensing anomalies were extracted using principal component analysis technique. The ore prospecting targets were shed light on by synthetic analy sis based on remote sensing information, geologic and geochemical data. A porphyry-type mineralization point,Jiafushaersu Mo mineralization point,was discovered during ground inspection which has confirmed the validity of this method. The method can provide a reference for the mineral exploration of small inter mediate-acid intrusion-related deposits in the western regions.