滇西云县红豆山铜矿构造地球化学特征及找矿预测

Tectonic geochemical characteristics and ore prediction in Hongdoushan copper deposit,Yunxian area,Western Yunnan

文章系统总结了南澜沧江火山弧成矿带成矿条件和红豆山矿区地质特征,以1272、1220中段为研究对象,开展了构造地球化学研究。依据构造岩样品采集分析数据,应用R型聚类分析、因子分析圈定矿化元素组合异常,发现该异常分布在矿区NE向F1断裂和NWW—近EW向F3断裂控制的蚀变岩中,由断裂→围岩依次出现高温→低温的异常分带现象,指示成矿流体的运移方向、矿体产状信息,为深部找矿预测提供了重要依据;通过构造控矿规律和构造地球化学研究,预测了NE向矿体产状及其深部延伸情况,在1272中段圈定了NWW—近EW向断裂控制的矿体,预测了矿体的产状及深部延伸情况,经工程验证在异常分布区及深部预测靶区取得较好找矿效果:圈定预测铜矿体且向深部延伸稳定,资源量约5万t,受构造控制的岩浆热液型矿体有达中型铜矿的前景。

This paper systematically summarizes the mineralization conditions of the volcanic arc metallogenic belt in southern Lancang River and the geological features of the Hongdoushan ore district. The authors studied the tectonic geochemistry at 1272 and 1220 level. On the basis of the analysis of the data collected from tectonic rock samples and by means of R- type cluster analysis and factor analysis, the authors delineated combinational anomalies of mineralization elements. The authors found that the distribution of anomalies in the altered rock is controlled by NE-trending F1 fracture and NWW-EW-trending F3 fracture in the mining area. The zonation of high temperature and low temperature anomalies occur successively from fracture to surrounding rock, indicating the direction of fluid migration as well as the information of orebodies and provided evidence for deep ore prediction. Through the researches on structural ore- controlling regularity and tectonic geochemistry, the authors found the occurrence and deep extension of the NE-trending orebody, delineated the orebodies controlled by NWW- and nearly EW-trending fractures at the 1272 level. Field work demonstrated favorable ore- prospecting areas in the anomaly distribution zone and deep prediction target area, the copper orebody was delineated and predicted, which extends stably to the depth. The authors estimate that the resource reserves are about 50,000 tons. The magmatic hydrothermal orebody controlled by tectonics has the prospect of reaching the medium copper deposit.