相山火山盆地主要地质单元物性特征分析

相山铀矿田为我国主要铀矿资源基地之一。对相山火山盆地主要地质单元的密度、磁化率、电阻率、极化率与波速物性进行了测试分析,测试样本覆盖地质单元包括鹅湖岭组一段、鹅湖岭组二段、沙洲单元、打鼓顶组一段、打鼓顶组二段、青白口系等。对测试数据采用3倍均方差法剔除异常值后进行数据统计,得到了常见值、平均值、变化范围等参数,结果表明变质岩与火山岩之间存在良好的物性界面,为深部找矿物探方法的开展提供了物性基础。通过逆质量磁化率(密度/磁化率)与密度交会分析,可较为明显的将物性交会区域划分为四个区,分别对应4类填图单元。该研究全面认识了相山火山盆地主要地质体的物性特征,对在该区开展重磁联合反演提供了新的思路,对该区深部探矿很有意义。

Analysis of characteristics of Xiangshan volcano basin geological units

Xiangshan uranium ore field is one of the main uranium resources base in china. On major geological units in Xiangshan volcanic basin density, magnetic susceptibility, resistivity, polarizability and wave velocity of material were test and analysis, test sample covering geological units include: ehuling group A and ehuling group second segment, sand unit and daguding group A, drum top group second segment and Qingbaikou system etc.. The test data by 3 times the mean variance method to eliminate the abnormal value of statistical data, the common value, average value, range and other parameters. The results show that the metamorphic rocks and volcanic rocks are good physical interface and provides the foundation for the deep looking for minerals prospecting methods of development of. Through the inverse magnetizing quality rate (density / susceptibility and density crossplot analysis, more obvious the physical rendezvous regions divided for four areas, corresponding to four kinds of mapping units. The study provides a new idea for the joint inversion of gravity and magnetic field in this region. Through the research of this paper, the comprehensive understanding of the physical properties of the main geological bodies in Xiangshan volcanic basin, which is of guiding significance for the deep exploration.