香山地区泥盆系沉积性砂岩铜矿成因研究分析

Analysis on the genesis of devonian sedimentary sandstone copper deposit in Xiangshan area

宁夏中西部香山地区,构造位置属北祁连加里东造山带中卫-中宁前陆盆地,在上泥盆统老君山组以及下伏下石炭统前黑山组赋存着不连续沉积-沉积改造型砂岩型铜矿。其中,狼嘴子铜矿、腰岘子铜银矿、峡子沟铜矿均为沉积型砂岩型铜矿。矿岩系属河流相沉积,具磨拉石建造特征。根据矿床基本特征、成矿条件及空矿因素等,将香山地区砂岩型铜矿分为沉积型、沉积改造型:沉积型铜矿以狼嘴子铜矿为代表,含矿地层为上泥盆统老君山组,矿体呈透镜体状,产状与地层产状一致,物质来源于下伏老地层及加里东期辉绿岩。该类型铜矿体规模小,铜品位低;沉积改造型以腰岘子铜矿为代表,该类型铜矿具有一定规模,铜品位高,并伴生银。

In the Xiangshan area of central and western Ningxia,the structural location belongs to the ZhongweiZhongning foreland basin in the Caledonian orogenic belt of the North Qilian Mountains. Discontinuity deposits occur in the Upper Devonian Laojunshan Formation and the Lower Carboniferous Pre-Montenegro Formation. Among them,the Luzuizi Copper Mine,the Yaotuzi Copper Silver Mine,and the Xiazigou Copper Mine are sedimentary sandstone-type copper deposits. The ore rock series is a fluvial deposit with the characteristics of rubble stone construction. According to the basic characteristics of ore deposits,metallogenic conditions,and empty ore factors,the sandstone-type copper deposits in the Xiangshan area are classified into sedimentary type and sedimentary type： the depositional type copper deposit is represented by Langzuizi copper deposit,and the ore-bearing strata are Upper Devonian. In the Laojunshan Formation,the orebodies are lens-shaped,their occurrence is consistent with the occurrence of strata,and the material is derived from the underlying old strata and the Caledonian diabase. This type of copper ore body is small in scale and low in copper grade. The deposition and reformation type is represented by waistline copper mine. This type of copper mine has a certain scale,high copper grade and associated silver.