甘肃礼县白家沟一带金矿土壤地球化学异常特征及评价

Characteristics and evaluation of soil geochemistry anomalies of gold deposits in Baijiagou area,Lixian County,Gansu Province

礼县白家沟一带横跨中秦岭陆缘盆地Ⅲ级构造单元,地处临潭-徽县Pb-Zn-Cu(Fe)-Au-Hg-Sb-Ag-Mo-W-SnⅣ成矿亚带。本文通过1:10000土壤地球化学测量,统计了研究区Au、As、Sb等12种元素的含量特征、分布特征、组合特征及等,并圈定了3处以Au、As、Sb为主的综合异常。初步认为研究区Au、As、Sb等元素找矿潜力较大;根据异常特征和成矿地质条件分析,可知异常分布在区域金主要赋矿地层-中上泥盆统西汉水群双狼沟组内,主要受地层和构造控制,其成矿类型主要为低温热液型;通过初步异常检查发现Au异常主要为矿致异常,发现2条金矿体3条金矿(化)体。

The Baijiagou area in Lixian County straddles the Grade III tectonic unit of the epicontinental basin in central Qinling Mountains and is located in Lintan-Huixian Pb-Zn-Cu (Fe)-Au-Hg-Sb-Ag-Mo-W-SnⅣ metallogenic subzone.In this paper,the content characteristics,distribution characteristics,combination characteristics,etc.of 12 elements such as Au,As,and Sb in the study area are calculated through 1:10000 soil geochemical measurements.Three comprehensive anomalies dominated by Au,As,and Sb are delineated..It is preliminarily considered that the prospecting potential of elements such as Au,As,and Sb in the study area is large;according to the analysis of anomalous characteristics and ore-forming geological conditions,it can be seen that the anomalous distribution in the regional gold-bearing strata-the Middle-Upper Devonian Xihanshui Shuanglanggou Formation It is mainly controlled by stratum and structure,and its metallogenic type is mainly low-temperature hydrothermal type.Through preliminary anomaly inspection,it is found that Au anomaly is mainly ore-induced anomaly,and 2 gold ore bodies and 3 gold ore (chemical) bodies were found.