Electrical Anisotropic Structure in the Quaternary Volcanic Region of North Hainan Island and Its Geological Implications
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摘要: 琼北地区广泛发育第四纪火山，然而其稳定性及与长流-仙沟断裂的关系仍存在争议.在琼北第四纪火山区，获得了覆盖雷虎岭火山系统的184个大地电磁测深数据.相位张量分析指示了电各向异性的存在，采用一维各向异性反演获得了地下电各向异性结构.结果显示浅部（~1~5 km）最小电阻率方向近平行于长流-仙沟断裂；而深部（~5~15 km）近南北向，与断裂斜交.研究表明长流-仙沟断裂不是深大断裂，且并不控制深部岩浆路径；深部各向异性可能反映了一个存储含盐流体的高孔隙度区域，其来源于更深位置的部分熔融，而这指示雷虎岭火山系统当前处于休眠状态.Abstract: Quaternary volcanoes are widely distributed in the North Hainan island. However, the stability and the relationship with the Changliu-Xiangou fault remain controversial. 184 magnetotelluric data covering the Lei-Hu-Ling volcanic system were acquired in the Quaternary volcanic region of North Hainan island in this study. The analysis of phase tensors indicates the existence of electrical anisotropy, and consequently the electrical structure was obtained by 1D anisotropic inversion. The inversion results show that the minimum resistivity direction is almost parallel to the Changliu-Xiangou fault in the shallow (~1-5 km) and strikes south-north in the deep (~5-15 km), which is oblique to the fault. It is found that the Changliu-Xiangou fault is not a deep-large fault and does not control the deeper magmas path. We prefer to attribute the deep anisotropy to accumulation of high-salinity fluids in the storage zone with high porosity, which is associated with the transportation of magmatic fluids and volatiles supplied by a partial melting zone at greater depths. It is concluded that the Lei-Hu-Ling volcanic system is dormant at present.
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图 1 研究区地形及测点分布
白色实心点为BBMT测点，浅蓝色实心点为AMT测点.LHL.雷虎岭火山口；RHL.儒黄岭火山口；YML.永茂岭火山口；LJP.罗京盘火山口；C-X Fault.长流-仙沟断裂；Profile 1, 2, 3.穿越火山口的3条剖面
Fig. 1. Research region topography and site distribution
图 2 BBMT测点0.1 s (a)、1.1 s (b)、23.2 s (c)、216 s (d)四个周期的相位张量椭圆平面
图中椭圆长轴归一化为同一常数，填充的颜色表示扭曲角大小，黄色表示|ψ| > 6°
Fig. 2. The phase tensor ellipses of BBMT sites for 0.1 s (a), 1.1 s (b), 23.2 s (c) and 216 s (d)
图 3 AMT测点0.01 s (a)、0.1 s (b)、1.1 s (c)、23.2 s (d)四个周期的相位张量椭圆平面
Fig. 3. The phase tensor ellipses of AMT sites for 0.01 s (a), 0.1 s (b), 1.1 s (c) and 23.2 s (d)
图 4 三维异常体平面示意及测点分布
三维异常体顶面距地表 3 km，且尺寸为7 km×10 km×7.5 km，嵌入在100 Ω·m的半空间
Fig. 4. The plan view of 3D anomaly and site distribution
图 5 模型正演响应的一维各向异性反演结果剖面
a. x=0剖面；b. y=0剖面
Fig. 5. Vertical cross-sections of 1D anisotropic inversion result for the model forward responses
图 6 模型正演响应的一维各向异性反演结果不同深度切片
a. 2.1 km；b. 4.9 km；c. 9.1 km；d. 13.7 km；红色实线为理论模型最小电阻率方向
Fig. 6. Slices at different depths of 1D anisotropic inversion result for the model forward responses
图 8 BBMT测点一维各向异性反演结果不同深度切片
a. 1 km；b. 3 km；c. 5 km；d. 8 km；e. 11 km；f. 15 km
Fig. 8. Different depth slices of 1D anisotropic inversion result for BBMT sites
图 9 AMT测点一维各向异性反演结果不同深度切片
a. 0.2 km；b. 0.5 km；c. 1 km；d. 3 km
Fig. 9. Different depth slices of 1D anisotropic inversion result for AMT sites
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