豫西洛宁县铁炉坪Ag多金属矿床的CSAMT剖面及找矿意义

CSAMT Profile Through the Tieluping Ag-Polymetallic Deposit in Luoning County,Western Henan Province and its Implications for Deep Ore Prospecting

为获得新的深部找矿靶区,在铁炉坪Ag多金属矿床实施了CSAMT法测深。CSAMT剖面中,高、中、低电阻率异常体边界清晰、形态各异,高阻异常体具有上、下双层结构,低阻异常体出露较小,多呈孤立形态产出,主要有400m低阻异常体和1400m低阻异常体。高阻异常体被解释为浅部和深部两层岩浆和深部流体活动的产物,推测深部高阻异常体以岩浆体系为主,浅部高阻异常体应是岩浆体系、深部流体体系及围岩硅化蚀变等的综合反映。400m低阻异常体对应于于地表剖面线400m^600m之间的主矿脉,表明它是深部成矿流体的显示,提出1400m低阻异常体为新的深部找矿靶区。

In order to find new deep geologic exploration targets, a CSAMT profile was deployed through the Tieluping Ag-polymetallic deposit. On this survey profile, resistivity anomaly bodies show sharp boundaries, different scales and complex shapes. High-resistivity anomalies have an obvious double-layered structure. According to elevations of the localities, low-resistivity anomlies with small sizes and isolated shapes are named 400m and 1400m anomlies, respectively. The high-resistivity anomalies are considered to be the results of active double-layered magma and/or deep fluids reaching the shallower subsurface. The high-resistivity anomalies at depth are likely the product of magma, while the shallower ones should be the compositive product of magma, deep fluids and wallrock alteration. The 400m low-resistivity anormlies correspond to occurrence of main veins between surface lines 400m and 600m in the Tielluping Ag-polymetallic deposit, which may be indicative of deep fluids activity. The 1400m low-resistivity anormly bodies are considered as new deep targets for ore-search.