腾冲地区壳幔多尺度三维深部电性结构研究

腾冲地区是我国著名的新生代大陆火山构造活动区，大量关于腾冲火山的研究结果表明，腾冲地区地下岩浆并未停止活动，而且潜伏着再次喷发的危险性。火山活动与其深部岩浆源区有着直接的联系，然而腾冲地区深部岩浆源区的结构和分布目前还尚不清楚。前期的宽频带大地电磁测深(MT)研究发现腾冲火山区存在三个以低电阻率为特征的地壳岩浆囊结构，但腾冲地区是否存在深部地幔岩浆源区或地幔岩浆源区结构特征如何缺乏来自上地幔深部电性结构的信息约束。本课题拟在申请人已有工作基础上在腾冲地区进一步开展长周期大地电磁测深(LMT)研究，最终获得腾冲地区壳幔多尺度三维深部电性结构模型，为腾冲火山深部岩浆源区结构以及火山活动壳幔相互作用的深部动力学过程提供全面的深部电性结构理论依据。本研究对于腾冲地区未来火山活动灾害的预测防治具有重要的科学指导意义。

The Tengchong area is a well-known Cenozoic volcanic tectonic activity area in China. A large number of research results on the Tengchong volcano show that the underground magma activity in the Tengchong area has not ceased, and there is a potential for re-eruption in the future. Volcanic activity is directly related to its deep magmatic sources. However, the deep structure and distribution of the deep magma sources in Tengchong area are still unclear. The applicant’s early broadband magnetotelluric (MT) research found that there are three crustal magma chambers characterized by low resistivity in the Tengchong volcanic area, but whether there is a mantle magmatic source area or what is the structure of the mantle magmatic source in the Tengchong area lacks of information from the deep electrical structure of the upper mantle in Tengchong area. This project intends to further carry out long-period magnetotelluric (LMT) research in the Tengchong area based on the existing work, and finally obtain a multi-scale deep electrical structure model of the crust and mantle in the Tengchong area. This research will provides a comprehensive basis for the electrical resistivity structure of the Tengchong volcano and the dynamic process of volcanic crust-mantle interaction beneath Tengchong. This project will be of great significance for the prediction and prevention of future volcanic disasters in Tengchong area.