COMPREHENSIVE GEOPHYSICAL INTERPRETATION FOR THE GEOLOGICAL AND MINERAL SURVEY IN BASALT-COVERED REGION OF CHANGBAI MOUNTAIN: A Case Study of Kaifeng Forest Farm Area
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摘要:
结合长白山玄武岩覆盖区的7条综合物探剖面，利用重力、高精度磁法、可控源音频大地电磁测深、浅层地震勘探等多种物探工作方法，研究和探讨了玄武岩覆盖之下地质体的空间展布、岩性和构造特征，进行了地质填图和找矿方法的有效性试验，并结合工程钻孔加以验证.绘制了玄武岩覆盖区基底推断图和玄武岩厚度等值线图，总结了新生代玄武岩覆盖区区域地质矿产调查的有效工作方法手段.
Abstract:Combined with 7 comprehensive geophysical sections in the basalt-covered area of Changbai Mountains, multiple geophysical exploration methods such as gravity, high-precision magnetic survey, controlled source audio-frequency magnetotellurics (CSAMT) and shallow seismic exploration are used to study the spatial distribution, lithology and structural characteristics of basalt-covered geological bodies. Through geological mapping and validity test of prospecting methods, the results are verified with engineering drilling. Furthermore, the paper draws the inferred map of basement in the basalt covered area and contour map of basalt thickness, and summarizes the effective methods of geological and mineral survey in Cenozoic basalt-covered region.
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Key words:
- basalt-covered area /
- gravity survey /
- high-precision magnetic survey /
- CSAMT /
- shallow seismic /
- Changbai Mountains
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表 1 研究区典型岩石物性参数统计表
Table 1. Physical parameters of typical rocks in the study area
填图单位名称 岩性 样品数 密度/（kg/m3） 磁化率/4π×10-6 电阻率/Ωm 极化率/% 青白口系钓鱼台组石英砂岩 石英砂岩 31 2.91 53 677 0.9 中震旦统八道江组叠层石灰岩 叠层石灰岩 33 2.67 78 3095 0.6 寒武系第二-第三统馒头组粉砂岩 粉砂岩 31 2.34 45 574 0.8 寒武系芙蓉统-下奥陶统冶里组灰岩 灰岩 37 2.57 98 3896 0.7 中-下二叠统山西组砂岩 砂岩 30 2.01 170 479 0.9 上三叠统小河口组粉砂岩 粉砂岩 29 2.1 120 423 0.8 古元古代花岗片麻岩 花岗片麻岩 30 2.72 59 1589 0.9 新太古代英云闪长质片麻岩 英云闪长片麻岩 32 2.65 18330 1793 1.5 古元古界花山组绿泥片岩 绿泥片岩 31 2.98 210 497 1.2 古元古界珍珠门岩组大理岩 大理岩 30 2.83 67 3407 0.7 上三叠统小河口组球状风化火山岩 球状风化火山岩 30 2.78 170 1093 1.6 下白垩统果松组安山岩 安山岩 30 2.61 11690 994 1.8 下白垩统林子头组凝灰质砂砾岩 凝灰质砂砾岩 27 2.34 180 407 0.9 新近系-第四系玄武岩 玄武岩 30 2.94 15960 514 1.1 早白垩世花岗斑岩 花岗斑岩 29 2.79 11520 2876 1.2 早白垩世流纹斑岩 流纹斑岩 30 2.94 110 1198 0.9 注：各参数为该类岩石样品的平均值. 
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