阿斯哈—按纳格地区线-环构造与有利成矿关系分析

Analysis of line-ring structure and favorable relationships to mineraliztion in area from Asiha to Annage

地处东昆仑造山带的青海省都兰县阿斯哈—按纳格地区是我国著名的成矿带之一,区内地质构造复杂,金属成矿作用极为发育,成矿潜力巨大。为了对该地区金矿整装勘查建立一套矿产快速评价方法组合体系,在研究阿斯哈—按纳格地区的区域地质特征与成矿地质条件基础上,结合矿床地质理论,建立以遥感地质矿产信息提取为中心的找矿技术方案,对整个研究区的Quick Bird,ASTER和ETM+等不同分辨率的卫星遥感图像进行了线-环构造解译和遥感矿化色调异常提取;在综合分析区内典型金矿床的遥感影像特征和筛选有利于成矿的线-环构造基础上,圈定出20个找矿有利部位。遥感矿化色调异常与化探异常的对比分析结果表明,两者的吻合度较高,对高效找矿勘查提供了重要依据。

Located in the East Kunlun orogenic belt of Qinghai Province, Asiha - Annage area is one of China＇ s famous metallogenic belts. The geological structure in the area is complex, and the metal mineralization is also extremely rich. In addition, the metallogenic potential is tremendous. In order to establish a system of mineral combination evaluation method for gold exploration in the region, the authors established the metallogenic geological remote sensing information extraction scheme as the center of prospecting technology according to regional geological characteristics and metallogenic geological conditions in area from Asiha to Annage and in combination with the theory of deposit geological remote sensing. On such a basis, different resolution images such as QuickBird, ASTER and ETM ~ were interpreted for the line - ring structure and tone anomaly in the whole study area. Furthermore, the authors analyzed the image characteristics of regional typical gold deposits, found the line - ring structure favorable for mineralization and delineated 20 prospective ore - search areas. A comparative analysis of the tone anomalies and geochemical anomalies shows that the degree of the coincidence between the two kinds of anomalies is high and significant to the high efficient ore prospecting.