陕西柞水冷水沟地区遥感地质特征及找矿预测

Remote sensing geological features and ore prediction inLengshuigou,Zhashui County,Shaanxi Province

陕西柞水县冷水沟地区中酸性小岩体发育,与之相关的矿产丰富。为加速冷水沟地区找矿工作的突破,应用World View-I,ASTER等多源遥感数据开展大比例尺遥感地质解译。厘定了斜长花岗岩、闪长岩、石英闪长岩和花岗岩等4类不同岩性的侵入体,线性断裂构造、断裂破碎带及构造密集带等3类遥感线性构造以及环形构造的遥感地质特征;通过对区内蚀变矿物的分类及光谱特征的分析,应用主成分分析方法直接提取了区内与矽卡岩化有关的"榴石类矿物-透闪石-透辉石-阳起石"和"绿泥石-绿帘石-阳起石-透闪石-透辉石"2类遥感蚀变矿物组合异常。遥感地质特征揭示,冷水沟岩体深部具有较大的岩浆穹窿,外围存在隐伏岩体,遥感异常信息矿致性明显。通过综合分析,在研究区内预测了阳沟凹—吊庄梁和青定坪2个遥感找矿预测区。

Located in Zhashui County of Shaanxi Province, the Lengshuigou polymetallic concentration area is rich in mineral resources related to intermediate-acid small intrusive bodies. In order to get a breakthrough of mineral exploration, the authors carried out large-scale geological survey of remote sensing based on high resolution and hyperspectral data, such as WorldView -I and ASTER. According to the survey results, four kinds of intrusive bodies with different lithologies and three types of linear structures as well as circular structures were interpreted from remote sensing images. Based on the classification of the altered minerals and analysis of the features of spectra, the authors extracted two kinds of remote sensing anomalies related to skarnization by using principal component analysis. The remote sensing geological features show that there exists a relatively large magmatic dome at the depth of the Lengshuigou body, that hidden rock bodies are distributed around the dome, and that ore -forming information of remote sensing anomalies is very obvious. Through a comprehensive analysis, two prospecting targets of remote sensing were delineated in the study area.