滇西南澜沧江带红豆山铜矿床蚀变分带及其找矿意义

红豆山铜矿床是南澜沧江带新发现的矿床之一。通过野外地质工作和系统构造—|蚀变岩相填图，发现该矿床蚀变类型主要以钾长石化、硅化、绿泥石化、绿帘石化为主，其次为碳酸盐化、绢云母化、黄铁矿化等，且在空间上呈现一定规律，各蚀变带具有明显的叠加现象。依据区内岩石蚀变矿物组合等特点，自断裂带→上盘围岩，共出现4个典型蚀变带，依次为碎裂岩化带→长英岩化—碳酸盐化—绢云母化带→硅化—绿泥石化—绿帘石化带→弱长英岩化安山岩带。矿（化）体主要分布在长英岩化、碳酸盐化、绢云母化带和硅化、绿泥石化、绿帘石化带。由斑岩脉中心至边缘发育钾化带→硅化带→青磐岩化带→绢云母化带，斑岩旁侧围岩中发育放射状石英—方解石—黄铜矿脉。

ALTERATION ZONING AND PROSPECTING SIGNIFICANCE OF THE HONGDOUSHAN COPPER DEPOSIT IN THE SOUTHERN LANCANGJIANG BELT, WESTERN YUNNAN

The Hongdoushan copper deposit is one of the newly discovered in the southern Lancangjiang belt. The alteration characteristics and zoning of the deposit have been studied through field geological work and systematic structural alteration lithofacies mapping. The main altered types for Hongdoushan deposit are as follows: potassic feldspathization, silicification, chloritization, epidotization, and secondary carbonation, sericitization and limonitization. Surrounding rock alteration in the mining area shows a certain regularity in space, and the alteration zones have obvious superposition phenomenon. According to the characteristics of altered rocks in the area, from the fault zone to the hanging wall rock, there are four obvious alteration zones, which are Cataclastic rock zone, felsic lithification-carbonate-sericite zone, silicification-chlorite-epidote zone and weakly felsic lithification andesite zone. The ore-bodies are located mainly in the felsic lithification, carbonate-sericite zone and silicification-chlorite-epidote zone. The concentric alteration zones from the inner outward of the porphyry veins are successively potassic zone, silicide zone, propylitic zone, sericite zone. Radial quartz-calcite-chalcopyrite veins are developed in the surrounding rocks beside the porphyry.