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
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摘要
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。
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.
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.
引文
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[4] 解建民,陕西蟒岭地区宽坪群的构造演化[J].西安地质学院学报,1987,9(4):23-32.XIE J M,Tectonic evolution of the Kuanping group in the Yuling area-Shaanxi[J].Journal of Xi'an Institute of Geology,1987,9(4):23-32.(In Chinese)
[5] 罗铭玖,林潜龙,卢欣祥,等.东秦岭含钼花岗岩的地质特征[J].河南地质,1993,11(1):2-8LUO M Q,LIN Q L,LU X X,et al.Geological characteristics of molybdenum-bearing granites in the eastern Qinling Mountains[J].Henan Geology,1993,11(1):2-8.(In Chinese)
[6] 柯昌辉.北秦岭蟒岭岩体西侧钼多金属矿床成矿作用研究[D].北京:中国地质科学院矿产资源研究所,2013:1-90.KE C H.Study on mineralization of molybdenum polymetallic deposits in the west of the Qiling rock mass in the North Qinling Mountains [D].Beijing:Institute of Mineral Resources,Chinese Academy of Geological Sciences,2013:1-90.(In Chinese)
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[8] 黄俊平,徐荣华,姚绍萍.重力勘探法在江西省中酸性岩体圈定中的应用[J].地球物理学进展,2016,31(4):1583-1592.HUANG J P,XU R H,YAO S P.Application of gravitational method of exploration in delineationing of buried intermediat acid granite[J].Progress in Geophysics,2016,31(4):1583-1592.(In Chinese)
[9] 彭聪.中国西部布格重力异常特征和地壳密度结构[J].地球学报,2005,26(5):417-422.PENG C.Bouguer anomalies and crustal density structure in Western China[J]Acta Geoscientica sinica,2005,26( 5) :417-422.(In Chinese)
[10] 王万银,王云鹏,李建国,等.利用重磁资料研究于都赣县矿集_盘古山地区断裂构造及花岗岩体分布[J].物探与化探,2014,38(4):825-834.WANG W Y,WANG Y P,LI J G,et al.Study on the faults structure and granite body distribution in Pangushan area of Yudu-Ganxian ore district using gravity and magnetic data[J].Geophysical and Geochemical Exploration,2014,38(4):825-834.(In Chinese)
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