The petrophysical characteristics of the Heishan copper-nickel sulfide ore district in the Beishan metallogenic belt and their prospecting significance
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摘要: 161件采自地面、1 134件采自钻孔岩芯的主要岩石、矿石标本物理性质参数测量结果表明,北山成矿带黑山铜镍矿区的矿化岩体、岩体、围岩地层具有显著的密度、磁化率、剩磁强度、极化率差异,具备良好的地球物理勘查前提;按矿化岩体、岩体、围岩间物性差异大小及形成异常的能力,对于北山地区寻找岩浆熔离型铜镍硫化物矿床具有如下意义:大比例尺、高精度重磁扫面圈定的块状高磁异常、高重力异常,可能是基性-超基性岩体存在的标志;在此可能指示基性-超基性岩体赋存的块状重磁异常区开展大比例尺的激发极化法、电阻率、磁力测量,若获得块状或筒状极化率高于10%的异常和高阻中的低阻异常、较高或者更高的磁异常、重力异常,它们可作为岩体可能已矿化的标志.Abstract: Based on physical property parameter measurements of main rock and ore specimens from 161 surface samples and 1 134 drilling core samples in the Heishan copper-nickel ore district, the authors found that the mineralized rock body, rock body and wall rock strata all exhibit obvious differences in density, magnetic susceptibility, residual magnetization and polarizability, thus possessing favorable prerequisite for geophysical exploration.The study based on physical property difference degrees of mineralized rock body, rock body and wall rock strata and capability for forming anomalies has the following meaning: Massive high magnetic anomaly and high gravity anomaly delineated by large-scale high-precision gravity-magnetic regional sweeping survey might indicate the existence of mafic-ultramafic rock body;If large-scale IP, resistivity and magnetic survey is carried out in such a massive gravity and magnetic area and massive or pipe-like anomaly whose polarizability is higher than 10%, low resistivity anomaly in the high resistivity anomaly, relatively high or higher magnetic anomaly and gravity anomaly, the rock body in this area might have been mineralized.
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