云南大姚六苴铜矿地质特征及找矿方向

发布时间：2018-11-09 14:24

【摘要】：六苴铜矿为位于滇中楚雄盆地的典型砂岩型铜矿床,具有显著的浅色岩层与紫色岩层过渡带及金属矿物的分带性,长石石英砂岩粒间隙为金属矿物的有利赋存空间。结合矿区相关地质工作成果,对矿区及矿床地质特征、控矿因素、矿床成因进行了分析,研究表明:(1)矿床的主要赋矿层位为白垩系上统马头山组六苴下亚段(K1ml1)浅色层与紫色层交互带,矿体呈层状、似层状产出;(2)矿床金属矿物主要为辉铜矿、斑铜矿、黄铜矿,次生氧化物有(硅)孔雀石、赤铜矿、铜蓝等,矿床内原生金属矿物在水平、垂向上的分带性较明显;(3)矿床矿化主要受NW向断裂控制,NE向、近EW向及SN向断裂控制着矿体的形态及产状,矿化主要产于白垩系上统马头山组下部六苴下亚段(K_2ml~1)的长石石英砂岩内,矿体严格受地层、岩性控制,矿化富集于强氧化地带向强还原地带转化的过渡带的碱性介质环境中;(4)矿床成因属典型沉积成岩-后生改造型"红层"砂岩型铜矿床。在上述分析的基础上,提出矿区小河—石门坎、界牌—火箭山深部为矿区下一步的重点找矿靶区。
[Abstract]:Liuju copper deposit is a typical sandstone-type copper deposit located in Chuxiong basin in central Yunnan. It has obvious transitional zone of light-colored rock and purple rock and the zonation of metallic minerals. The intergranular space of feldspar quartz sandstone is favorable for the occurrence of metal minerals. The geological characteristics, ore-controlling factors and the genesis of ore deposits are analyzed based on the results of relevant geological work in mining areas. The results show that: (1) the main ore-bearing horizon of the deposit is the interaction zone between the light-colored layer and the purple layer of the Lower Liuju submember (K1ml1) of the Upper Cretaceous Matoushan formation of the Cretaceous, and the orebody is stratiform and bedded; (2) the main metallic minerals of the deposit are chalcopyrite, porphyrite, chalcopyrite, secondary oxides such as (silicon) malachite, hematite, copper blue and so on. (3) the mineralization of the deposit is mainly controlled by the NW trending fault, the NE direction, the near EW direction and the SN direction fault controlling the shape and occurrence of the orebody. The mineralization mainly occurs in the feldspar quartz sandstone (K_2ml~1) in the lower Liuju submember of the Upper Cretaceous Maitoushan formation. The orebody is strictly controlled by strata and lithology and is enriched in the alkaline medium environment of the transition zone from strong oxidation zone to strong reduction zone. (4) the origin of the deposit is typical sedimentary diagenetic-metamorphic "red bed" sandstone copper deposit. On the basis of the above analysis, it is proposed that the river-Shimenkan and the deep boundary-rocket mountain are the next important ore-prospecting targets in the mining area.
【作者单位】：云南省有色地质局地质勘查院;中国有色金属工业昆明勘察设计研究院;
【分类号】：P618.41

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