Three-Dimensional Electrical and Deep Structure Features in Baogutu Area of Western Junggar
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摘要: 为探明西准噶尔包古图地区地下电性特征及两块露头岩体深部结构关系，采用音频大地电磁测深对该地区进行了三维性质的地质填图勘探.将二维OCCAM反演得到的电性结构结果以三维形式成图，从多角度展示了该地区地下电性特征，并发现两块目标岩体在深部构造上由通道相连.经推断是在石炭系希贝库拉斯组、包古图组、泰勒古拉组等地层组成的背斜形成后，由于岩浆运动上侵在与斑岩体对流时冷却产生热机械能，从而导致破裂裂隙在岩体、围岩之中产生裂隙构造组合，热液通过这些通道而形成包古图岩体.Abstract: Audio magnetotelluric sounding is used in this study for geological mapping exploration of three-dimensional nature to determine the underground electrical characteristics and relationship of deep structure of two outcrops of rock mass in Baogutu area of Western Junggar The two-dimensional OCCAM inversion electric structure results in the form of three-dimensional mapping, displaying the underground electrical characteristics from various angles. Two pieces of rock mass in the deep structure are found to be connected by channels. It is concluded that the mechanical energy generated in the cooling process of magma intrusion and porphyry convection led to fissures in the rock mass, which in turn led to structural fissures after the formation of anticline in Carboniferous Siebel Kuras Group, Baogutu Group, and Tailegula Group, because of the movement of cooling thermal and, thus causing, rock combination of cracks, Baogutu rock formed eventually when hydrothemal moved through these channels.
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图 1 西准噶尔区域地质
1.研究区域；2.包古图含矿斑岩及编号；3.花岗岩；4.断层
Fig. 1. The Western Junggar regional geological sketch
图 2 SN07-05测点(a)和SN08-06测点(b)原始数据
Fig. 2. The original data of SN07-05 point(a) and SN08-06 point(b)
图 3 观测点布置及研究区域
注：视角1：从测区的西南角沿NE向；视角2：从测区西侧沿WE向；视角3：从测区北侧沿SN向；视角4：从测区的东侧沿EW向
Fig. 3. Observation layout and the study area
图 6 深度(a)、WE向(b)、SN向(c)、三方向(d)、NW对角(e)和NE对角(f)切片
Fig. 6. Depth (a), WE (b), SN (c), three direction (d), NW diagonal (e) NE diagonal (f) slices
图 7 推测地下岩体的电性结构(视角1~4)(a~d)
Fig. 7. The electrical structure of underground rock mass speculation
表 1 西准噶尔包古图地区实测物性
Table 1. The measured property table of Baogutu area in Western Junggar
岩性 标本块数 磁化率 电阻率(Ω·m) 极化率(%) 常见值 变化范围 常见值 变化范围 常见值 变化范围 硅质岩 21 27 2.9~484.3 2 983 1 236.6~214 482.0 0.78 0.45~2.30 花岗斑岩 6 87.7 82.4~91.4 5 162 4 374.6~8 631.2 1.00 0.90~1.10 泥质砂岩 19 193 59.2~325.2 3 862 819.7~72 097.7 1.60 0.70~8.10 凝灰质泥质砂岩 39 157 102.4~370.5 2 585 326.0~253 070.0 0.97 0.40~7.10 凝灰质砂岩 174 125.6 19.0~918.4 2 930 739.0~801 593.0 1.10 0.48~9.30 闪长玢岩 4 1 298 1 289.0~1 364.0 206 429 166 386.0~283 725.0 2.50 2.30~3.40 注：测试单位：中国地质大学(武汉)地球物理与空间信息学院实验中心；测试日期：2013年1月17日；测试者：李永涛. 
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