羊拉铜多金属矿深部地质特征及找矿方向

Deep Geological Characteristics and Prospecting Direction of Yangla Copper Polymetallic Deposit

羊拉铜多金属矿位于金沙江断裂与羊拉断裂带SN向的狭长区域内,区内因复杂的地壳结构、强烈的构造活动及频繁的岩浆活动和多期次的围岩蚀变及叠加改造,形成丰富的矿种类型。通过区域地质特征、矿床地质特征的分析,认为矿床经历了晚泥盆纪—石炭纪喷流沉积成矿作用和印支岩浆热液、岩浆期后热液的叠加改造作用,里农组一段透辉石矽卡岩及石榴石矽卡岩为主要的含矿岩性;印支中晚期—燕山早期的断裂构造对矿区成岩成矿作用具有重要意义,矿体受构造、地层及岩浆岩的控制作用较为明显,为典型的层控型复合成因矿床。结合矿区地质特征,里农矿段首采区西侧深部具有寻找矽卡岩型铜矿、大脉状铜矿的良好找矿潜力,里农矿段与路农矿段结合部位的构造转折端也是有利的成矿部位。根据上述分析,对矿区找矿方向进行了讨论,为矿区深部地质找矿提供可靠依据。

Yangla Copper Polymetallic Deposit is located in the SN-trending long and narrow area of Jinshajiang Fault and Yangla Fault zone.Due to the complex crustal structure,intense tectonic activity,frequent magmatic activity and multiple periods of surrounding rock alteration and superposition transformation,the area has formed rich ore types.Based on the analysis of regional geological characteristics and geological characteristics of the deposit,it is concluded that the deposit has undergone late Devonian-Carboniferous jet sedimentary mineralization,Indosinian magmatic hydrothermal and post-magmatic hydrothermal superimposition,and diopside skarn and garnet skarn of the first member of Linong Formation are the main ore-bearing lithology.The fault structure of middle and late Indosinian to Early Yanshanian is of great significance to the diagenesis and mineralization of the mining area,and the orebody is obviously controlled by structure,stratigraphy and magmatic rocks,which is a typical laminated composite deposit.Combined with the geological characteristics of the mining area,the deep west of the first mining area of Linong ore segment has a good prospecting potential for skarn type copper deposit and large vein copper deposit,and the structural transition end of the joint part of Linong ore segment and Lunong ore segment are also a favorable metallogenic location. Based on the above analysis,the prospecting direction of the mining area is discussed,which provides a reliable basis for deep geological prospecting of the mining area.