滇南丘北亮山金矿成矿地质特征及控矿因素

Metallogenic Geological Characteristics and Ore-controlling Factors of Liangshan Gold Deposit in Qiubei County,South Yunnan Province

亮山金矿位于滇黔桂"金三角"南盘江以南地区,是滇南丘北卡林型金矿的典型矿床。结合矿区以往地质研究成果,在分析区域成矿地质背景的基础上,讨论了矿区及矿床地质特征、控矿因素,并进一步总结了找矿标志。研究表明:(1)矿区有利的成矿层位为中三叠统拖味组上段(T2tb),区内成矿活动与碳酸盐岩(白云质碎屑灰岩)关系密切;(2)矿区深部富含钠质的岩体为成矿提供了热源,F_1、F_2断裂推动了成矿流体发生运移和沉淀富集,矿床成因属低温热(卤)水卡林型金矿床;(3)通过对矿区地球化学、地球物理特征的研究,认为激电异常、土壤化探异常以及岩石化探异常吻合度较高的区域为成矿有利地段,矿化严格受控于地层、构造及岩浆岩,与围岩蚀变一并构成了矿床的重要找矿标志。

Liangshan Gold Deposit is located in the south of Nanpang River of Yunnan-GuizhouGuangxi golden triangle,which belongs to carlin type gold deposit in Qiubei county,south Yunnan Province. Combing with some related geolgoical study results of Liangshan mining area,the regional metallogenic geological background and geological characteristics of the mining area and deposit are analyzed,besides that,the ore-controlling factors and prospecting indicators are summarized. The study results show that：（1）the favorable metallogenic strata of the mining area is the upper of Tuowei Formation of Middle Triassic（ T2 tb）,the metallogenic activities of the mining area is closely related to carbonate rock（ dolomitic clastic limestone）;（2） the hot source of metallogenic activities is provided by the sodium-enriched rock mass in the deep area of the mining area,migration and precipitation-preconcentration of metallogenic hydrothermal fluid are promoted by F_1 and F_2 fractures,the deposit genesis is belongs to epithermalbrine carlin type gold deposit;（3）through comprehensive study of the geophysical and geochemical characteristics of the mining area,the high anastomosis degree area of IP anomaly,soil geochemical anomaly and rock geochemical anomaly can be regarded as the favorable metallogenic position,the mineralization in the mining area is strictly controlled by strata,structures and magmatic rock,besides that,the above ore-controlling factors and surrounding rock alteration can be taken as the prospecting indicators of the mining area.