综合物探法在小秦岭地区中酸性岩体圈定及空间解析中的应用

蟒岭地区西部地处秦岭腹心,位于不同构造单位结合处,构造变动剧烈,岩浆活动频繁,多数矿产与中酸性岩体息息相关。综合物探工作通过地面高精度磁测、激发极化法和高精度重力测量三种地球物理综合测量方法,开展了研究区的磁场、重力场、极化率和电阻率的分布特征研究。深入分析了地质和地球物理特征的异同,并结合物性工作总结了中酸性岩体与地层的差异,了解了深部隐伏岩体的信息,圈定了岩体在地表的位置,推断出地下深层空间的地质结构,为进一步查找岩体以及其他与之有关的工程勘查活动提供借鉴,为该地区及类似地质背景下隐伏岩体定位预测提供了可靠的方法。

Application of integrated geophysical exploration method in delineation of intermediate acidic rock mass in the Xiaoqinling area and its spatial resolution

The western part of the Guling area is located in the abdomen of the Qinling mountains. It is located at the junction of different tectonic units. The tectonic changes are severe and the magmatic activity is frequent. Most of the minerals are closely related to the medium-acid rock mass. The integrated geophysical exploration work carried out three geophysical comprehensive measurement methods on the ground,such as high-precision magnetic survey,induced polarization and high-precision gravity survey. The distribution characteristics of magnetic field,gravity field,polarizability and resistivity in the study area were studied. In-depth analysis of the similarities and differences between geological and geophysical characteristics,combined with physical work to summarize the differences between the medium-acid rock mass and the stratum,understand the information of the deep concealed rock mass,delineate the position of the rock mass on the surface,and infer the depth of the underground deep space. The geological structure provides a strong basis for further searching for rock mass and other related engineering exploration activities,and provides a reliable method for the location prediction of concealed rock mass in the region and similar geological background.