新疆东戈壁地区成矿有利地质单元地面高光谱蚀变矿物分析及找矿应用

Analysis of ground hyperspectral alteration minerals in the favorable mineralization unit and prospecting application in the East gobi region,Xinjiang

东戈壁地区分布的成矿有利地质单元为下石炭统雅满苏组(C1y)安山岩、砂岩、灰岩、凝灰熔岩、凝灰岩,和北东向、近东西向断裂构造,以及闪长玢岩等。使用FieldSpec Pro FR地面光谱测试仪,对地面高光谱蚀变矿物进行识别,同时结合野外实地观测和化学分析测试,分析和总结了各成矿有利地质单元的蚀变矿物组合特征。在雅满苏组凝灰熔岩区地面高光谱蚀变矿物组合分布地段圈定了找矿预测区,经查证,发现钨钼等多金属矿化线索,地表云英岩化、褐铁矿化、绿泥石化等蚀变发育,表明石英+绢云母+褐铁矿+黄钾铁矾+绿泥石等地面高光谱蚀变矿物组合可为钨钼等多金属矿化线索的找寻提供重要指示性矿物标志。

The favorable mineralization unit in the eastern Gobi region, is Yamansu formation Lower Carboniferous System, which consists of andesite, sandstone, limestone, tuff lava, tuff, and the north-east trending, near east-west tredning fractures and diorite porphyry, etc. occur in the geological unit. By using FicldSpec Pro FR ground spectrum instrument the surface hypcrspectral al- teration minerals were identified. In combination with the field investigation and chemical analysis results, the characteristics of altera- tion mineral assemblages were analyzed and summarized in the various favorable geological units. The prospecting targets were outlined in the tuff lava layer of Yamansu formation where the ground hyperspcctra] alteration mineral assemblages occur. The tungsten-molybde- num polymetallic mineralization was found by the test engineering and the surface alteration assemblages such as greisenization, limoni- zation and chloritization occur, which indicates that the alteration mineral association of quartz, sericite, limonite, jarosite, chlorite and other ground hyperspectral alteration mineral can be used as key alteration mineral indicator for prospecting tungsten-molybdenum polymetallic mineralization in the region.