南岭东段典型矿区岩浆岩物性特征研究

Physical parameter features of magmatic rocks in typical mining area of eastern Nanling region

选取了南岭东段骑田岭、银坑、盘古山、九龙脑等几个较为典型的矿(集)区,对区内不同类型的岩浆岩进行了样品的采集,开展了密度、视极化率、视电阻率、磁化率、声波速度等物性参数测定,对测定结果进行了统计、分析和研究。绘制了岩浆岩物性参数变化规律直方图,对比分析了不同类型矿(集)区岩浆岩各种物性参数的差异,同时利用交会图分析技术对几个矿集区岩浆岩的密度与电阻率、密度与声波速度、电阻率与声波速度参数之间的相关性进行了分析与讨论。论文总结了南岭东段典型矿区岩浆岩物性参数特征:低密度,密度数值变化范围为2.5~2.6g/cm3;中弱磁性,磁化率数值变化范围一般为(2~500)×4π×10-6SI(个别磁性岩体如银坑高山角岩体除外);低极化率,视极化率数值变化范围为0.5%~2%;中高电阻率,视电阻率数值变化范围为2 000~3 500Ω·m;中低速度,横波速度的数值变化范围为2 300~3 000m/s,纵波速度的数值变化范围为3 500~4 500m/s。总体上看,南岭东段岩浆岩物性特征可归纳总结为低密度、中弱磁性、低极化、中高阻和中低速度特征。

In this study, samples were collected from different types of magmatic rocks in Qitianling, Yinkeng, Pangushan in eastern Nanling region, and the density, apparent polarizability, apparent resistivity, magnetic susceptibility, sound wave velocity and other physical parameters were measured. The results of the test were analyzed and investigated. The histograms of the variation of the physical parameters of the magmatic rock were drawn, and the differences of various physical parameters of magmatic rocks in different types of ore deposits were compared and analyzed. At the same time, the correlation between the density and resistivity, density and sound wave velocity, resistivity and acoustic velocity parameters of magmatic rocks in several ore concentration areas were analyzed and discussed. The characteristics of the physical parameters eastern Nanling magrnatite are summarized as follows： low density （2. 5 - 2.6 g/cma） ; Weak magnetic, the numerical range of magnetic susceptibility is generally （2- 500） × 4π ×10^-6 SI （except individual magnetic bodies, such as the silver pit and the high mountain angle rock mass） ; low polarizability, the range of polarizability is 0. 5%- 2%; medium and high resistivity, the range of apparent resistivity is 2000 - 3500 Ω· m; medium and low velocity, the range of shear wave velocity is between 2300 - 3000 m/s, the variation range of the P-wave velocity is between 3500 - 4500 m/s. Overall, the physical feature of magmatite in eastern Nanling region can be summarized as low density, medium and weak magnetism, low polarization, high resistance, and medium and low velocity.