＜正＞青藏高原东南缘三江地区位于特提斯构造域东段,冈瓦纳大陆与劳亚大陆的结合部位,由特提斯洋的闭合以及随后裂解自冈瓦纳大陆的微陆块和古生代岛弧地体拼合而成（Deng et al.,2014）,在东南缘形成昌宁-孟连和金沙江-哀牢山两条主要的古特提斯缝合带。哀牢山构造带位于三江构造带东南部,经历了晚古生代-中生代古特提斯洋扩张、消减与闭合等演化过程（刘俊来等,2011）,

＜正＞青藏高原是一个多洋盆、多岛弧、多地体组成的特提斯体系,高原的形成与特提斯洋的演化具有密切关系,起源于冈瓦纳大陆的羌塘地块、拉萨地块、喜马拉雅地块随着特提斯洋的俯冲消减闭合而逐渐拼贴到亚洲大陆南缘,形成一系列狭长地块拼合而成的高原。新生代以来,雅鲁藏布江洋俯冲消减闭合、印度-亚洲大陆碰撞及印度大陆岩石圈俯冲导致了壳幔结构、物质组成及深部热状态的显著改变,伴随着一系列碰撞造山、岩浆活动及成矿事件。

＜正＞东特提斯三江构造带位于青藏高原东南缘,是班公湖-怒江缝合带与印度-雅鲁藏布江缝合带南部巨型转弯的关键地带,三江构造带经历了复杂多期次特提斯演化过程,保存了较完整的特提斯裂解-聚合多阶段构造演化记录。因此,三江构造带是研究特提斯洋俯冲消亡以及古、新特提斯洋构造转换的

A three-dimensional crust-mantle electrical structure of the Lushan earthquake area in the southern section of Longmenshan (LMS) is studied. The 3D inversion results of 108 MT array data showed that high-conductor layers (HCL) in the Songpan-Ganzi terrane (SGT) middle crust, Sichuan Basin (SCB) shallow surface, western Sichuan foreland depression (WSCFD) and LMS Moho. The Lushan earthquake area is subject to compressional deformation horizontally as the eastwards migration of Qinghai-Tibet Plateau material is blocked by the SCB and vertically by the upwards extension of high-conductor plastic material at depth. The aftershocks of the Lushan earthquake area are mainly confined within the Baoxing-Zhonglin-Daxing-Lushan high-conductor region, which has noticeable electrical structural differences compared to the overall high-resistivity structure of the LMS southern section; these differences explain why the aftershocks of the two earthquakes did not expand in the northeast and southwest directions of LMS. Because the 2022 and 2013 Lushan earthquakes both occurred in the same high-conductor region in the deep part of the Dachuan-ShuangShi fault to the Danyi blind fault, the 2022 Lushan earthquake was a strong aftershock of the 2013 Lushan earthquake in terms of electrical structural characteristics. © 2023 IEEE.

＜正＞1前言大地电磁测深方法（MT）是由上个世纪50年代初A.N.Tikhonov和L.Cagnird分别提出来的一种以天然交变电磁场为场源的电磁勘探方法,该方法成本较低、使用方便、操作简单、不受高阻层影响且具有很宽的频率范围,勘探深度可达几十公里甚至上百公里。在油气、地热田与矿产勘探开发,

在大地电磁数据处理中常对单剖面大地电磁数据进行三维反演获取地下电性结构信息,该方式存在对目标体边界刻画不清、受旁侧异常导致剖面存在假异常等问题。为在有限成本约束下得到更真实的三维反演结果,因此提出三维廊带式观测方式,通过采集少量廊带辅助测点与剖面测点共建廊带式测点观测系统,通过合成数据的三维反演结果分析可发现,基于该观测方式的三维反演结果,可有效约束剖面假异常区域,提升反演剖面可靠性,实现剖面三维精细化处理与解释。

For the mining of ionic rare earth ore (IREO) by in-situ leaching, the fracture structure, underground river and karst cave developed beneath the ore body, will become leakage pathways for the leaching liquors to escape and seriously reduce the recovery rate of IREO, in addition, the leach liquor along leakage pathways will also cause environmental pollution. Therefore, it is of great significance to study the deep structures and identify the leakage pathways. Our study area situates in Chang Ting county of Fujian province, which is an important rare earth deposit of China, in order to obtain high resolution deep electrical model, the electrical resistivity tomography based on multi-electrode resistivity method was used in this paper. First, we carried out multi-electrode resistivity method parameter experiment and select appropriate exploration parameters; Then, the Multi-electrode resistivity method data acquisition of 11 lines is completed by using ws-2 device mode; After that, the deep electrical structure model of the study area is obtained by inversion calculation and the thickness of the granite weathering layer (the layer containing rare earth ore) and the spatial distribution characteristics of the deep fracture structure are delineated by the deep electrical structure model of the study area. The interpretation results are consistent with the drilling results laid out in the study area. The exploration results provide important reference for the reserve evaluation of ion type rare earth mine, the sealing of leakage pathways and the layout of recovery pathways.
© Published under licence by IOP Publishing Ltd.

＜正＞1.引言川西前陆盆地沉积厚度大,具备形成大中型气田的成藏条件,勘探潜力大,是四川盆地重要的天然气勘探接替领域。然而,山前推覆带复杂地质构造制约了地球物理勘探工作精度,直接影响了对川西前陆盆地形成的认识,也影响了川西前陆盆地的油气地质评价。围绕对川西前陆盆地及邻区深部结构特征与油气富集规律的研究,以大地电磁测深为主建立研究区三维电性结构,结合区域重磁、地震背景异常特征,建立川西前陆盆地及邻区综合地球物理模型,探讨青藏高原东缘盆山体系与大型油气

＜正＞东特提斯三江构造带位于青藏高原东南缘,是班公湖-怒江缝合带与印度-雅鲁藏布江缝合带南部巨型转弯的关键地带,三江构造带经历了复杂多期次特提斯演化过程,保存了较完整的特提斯裂解-聚合多阶段构造演化记录。因此,三江构造带是研究特提斯洋俯冲消亡以及古、新特提斯洋构造转换的