五龙沟金矿集中区化探异常与遥感蚀变异常的综合分析

Comprehensive analysis of geochemical anomaly and remote sensing alteration of gold mineralized concentrate district in Wulonggou area

五龙沟地区位于东昆仑造山带的中部,元古界富金地层广泛分布,脆韧性剪切带发育,具有较好的成矿地质背景,是青海省最具资源潜力的金矿集中区之一。本文通过水系沉积物地球化学数据处理,优选出Au-As-Sb组合异常作为化探异常参数;利用ETM+遥感影像,采用波段比值和主成分分析等方法,提取了羟基异常和铁染异常;提出了遥感综合蚀变异常的概念,并把遥感综合蚀变异常作为遥感异常参数;最后,对工作区化探异常与遥感蚀变异常进行了综合分析。

Wulonggou area locates in middle part of orogenic belt in East Kunlun Mountains.It is one of the most important gold mineralized concentrate districts with a better metallogenetic geological background,in which the aurum-rich stratum of Proterozoic Eonothem and the brittle-ductile shear zone are distributing abroad.Composite anomaly of Au-As-Sb is selected as a geochemical anomaly parameter by data processing about stream sediment geochemistry.Using ETM image data as the information data,Hydroxylate Anomaly and Ferric Contamination Anomaly are extracted by remote sensing data processing,some methods,such as band ratio,principal component analysis etc.,are applied to enhance the alteration information on the image.Remote sensing integrate alteration is proposed and selected as the parameter of remote sensing alteration.Finally,based on integrated studies of geochemical anomaly and remote sensing alteration,several conclusions are drew.