Deep Conductivity Structure in Middle-East Junggar Basin Using MT
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摘要: 为了解准噶尔盆地深部构造特征，综合利用“深部探测技术与试验研究(SinoProbe)”项目在准噶尔盆地45°N 88°E处建立的大地电磁标准点实测资料，应用非线性共轭梯度法(NLCG)对该测站两条短剖面进行二维反演，结合新疆准噶尔盆地区域地质资料，对该地区地层电性结构进行了初步分析，发现准噶尔盆地中东部地区地下结构具有很好的电性分层.与现有地质资料相结合，分析发现其电性分层与地壳分层具有较好的对应.根据岩石层电导性推断：研究区域莫霍面埋深在46 km附近，岩石圈厚度在100 km左右.研究结果对准噶尔中东部地区深部地壳结构的认识具有一定的参考价值.Abstract: In order to understand the deep structural characteristics of Junggar basin, the conductivity structure of the region is analyzed in the paper using MT data obtained at standard points (45°N 88°E) in Junggar Basin based on SinoProbe project. Employing the method of nonlinear conjugate gradient for a 2D inversion of two short profiles in the study area, and analysis of the regional geological data, it is found that the ground has a good electrical layered structure in the middle-east Junggar Basin. A comparative analysis of the electrical layer and the crustal structure is made on the basis of geological data, finding that they show good consistency. Finally, it is concluded that the Moho depth is about 46 km, and the thickness of the lithosphere is about 100 km. The results can better the understanding of deep crustal structure in Middle-East Junggar Basin.
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图 2 测区各测点阻抗张量的Swift最佳电性主轴分布
Fig. 2. The distribution of best electrical axis with Swift impedance tensor principal of all measuring points of the survey area
图 3 测区两条剖面的二维偏离度平面分布(东西向与南北向)
Fig. 3. The plane distribution of 2D-approximator for the two profiles in survey area
图 4 基于非线性共轭梯度法东西(W-E)方向二维反演剖面
Fig. 4. The latitudinal direction profile(W-E) of 2D inversion based on nonlinear conjugate gradient methods
图 5 基于非线性共轭梯度法南北(S-N)方向二维反演剖面
Fig. 5. The north-south direction profile(S-N) of 2D inversion based on nonlinear conjugate gradient methods
图 6 测区拟三维大地电磁反演剖面图(X指向东，Y指向北)
Fig. 6. Pseudo-Three-Dimensional magnetotelluric inversion profile of the survey area
图 7 准噶尔盆地地层岩性结构与MT反演对比结果
Fig. 7. The comparison result of MT inversion and formation lithology charateristics of Junggar Basin
表 1 准噶尔盆地地壳分层结构对比
Table 1. The comparison of crustal layering structure in Junggar basin
构造层 埋深
(km)波速
(km/s)密度
(g/cm3)磁化强度
(104A/m)地质推断 MT推断 岩性 埋深
(km)电性分层 埋深
(km)沉积盖层
(K+R+Q+J)0~8 Vp：2.00~4.20
Vs：1.00~2.402.35~2.41 60 沉积岩 1~8 低阻层 3~8 沉积盖层
(T+P)8~16 Vp：4.20~5.40
Vs：2.30~3.002.45 80 变质基岩 8~13 低阻向高阻过度层 8~13 古生界褶皱基底 6~16 Vp：4.20~5.50
Vs2.30~2.802.64 80~150 变质基岩 8~13 低阻向高阻过度层 8~13 前寒武系结晶基底
(结晶基底上层)16~28 Vp：6.10~6.70
Vs：3.30~3.802.73~2.80 200 花岗片麻岩 13~26 高阻层 13~28 结晶地壳中层 28~39 Vp：6.90~7.10
Vs：3.90~4.102.8~2.85 190盆地中部上地壳中存在高磁化体强度为290~330 中基性片麻岩 26~35 高阻到低阻过度层 28~35 花岗片麻岩 35~40 低阻层 35~40 结晶地壳下层 39~52 Vp：7.00~7.40
Vs：4.00~4.302.87 100~120 辉长岩 40~48 超低阻层 40~55 上地幔顶部 52~ Vp：7.80~8.10
Vs：4.40~4.572.93~3.32 10 48~ 电阻开始变高 55~ 
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