宁芜盆地硫铁矿控矿因素及找矿研究  

ORE-CONTROLLING FACTORS AND PROSPECTING METHEODS OF PYRITE DEPOSITS IN NANJING-WUHU BASIN

作　　者：姚超美[1] 熊先孝[1] 杨更生[1] 杨泽元[1] 雷永良 

机构地区：[1]化学矿产地质研究院

出　　处：《化工矿产地质》2000年第4期222-228,共7页Geology of Chemical Minerals

摘　　要：宁芜盆地产有多处硫铁矿床 ,一些已达到大型矿床规模。火山穹窿、爆发角砾岩筒等火山构造 ,NE向、NW向断裂构造 ,辉石闪长玢岩体 ,“洼中洼”环境等对成矿具有控制作用。碳酸盐岩、安山岩、角砾岩等围岩岩性 ,硅质岩、硬石膏岩等喷气化学沉积岩 ,褐铁矿化黄铁矿化绢云母化高岭土化蚀变组合 ;磁感应强度大于 2 0 0 0nT ,剩余重力异常值在 0 .6× 10 -8～ 1.2×10 -8m/S2 区间 ,激电极化率 ηs 一般大于 15 % ,并伴有低电阻率异常 ;具有S异常 ,并伴有P、Mo元素组合异常等是宁芜盆地硫铁矿的找矿标志。盆地北段皇姑山地区、莺子山地区、濮塘地区、孚而岗地区为今后找矿的重点地段。The Nanjing Wuhu basin has developed many pyrite deposits, some of which have reached scale of a large sized deposit. These deposits were, when being formed, controlled by volcanic structures (volcanic dome and volcanic breccia pipe), fault structures (NE and NW trending), gabbro porphyrite body and “depression in depression”. Mnay aspects may be regarded as ore hunting indicators for the deposits, including such enclosing rocks as carbonatite, andesite and breccia, hot water sediments as silicalite and gypsum, alteration assemblages as limonitization pyritization sericitization kolinization, higher magnetic induction strength (>2000nT), residual gravity anomaly between 0.6x10 -8 m/s 2 and 1.2x10 -8 m/s 2, larger induced polarization rate (generally η s>15%) with lower resistive anomaly, and S anomaly with composite anomaly of P, Mo and the like. Emphasis of the future exploration should be put on the Huanggushan, Yingzishan, Putang and Huergang districts of the northern part of the basin.

关 键 词：宁芜盆地 硫铁矿 控矿因素 找矿方向 火山构造 成矿作用 

分 类 号：P611[天文地球—矿床学] P612[天文地球—地质学]