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首页> 外文期刊>Journal of Asian earth sciences >Electrical resistivity variations of lithospheric mantle beneath the northern Tibetan Plateau with tectonic implications
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Electrical resistivity variations of lithospheric mantle beneath the northern Tibetan Plateau with tectonic implications

机译：北北藏高原下岩石地幔的电阻率变化，构造构造

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The northern Tibetan Plateau, including the areas north of Kunlun Shan, is characterised by a strapped basin-range system and major strike-slip faults; however, the surficial deformation, differs laterally. The collection of magnetotelluric (MT) data covering the northern Tibetan Plateau has made it possible to apply a three-dimensional isotropic inversion of these data for the entire study area. The plane area covered by MT sites is more than 700 x 700 km(2) and the longest periods of most of these sites approximate or exceed 10,000 s. All of these aid in distinguishing the weak responses generated by deep anomalies in the lithospheric mantle. The three-dimensional inversion is applied to a subset of MT data, and it is observed that the full impedance data of most MT sites well-fit the responses of the final three-dimensional model. Two modes of relationship among the lithospheric mantles in the northern Tibetan Plateau are proposed. The moderate-low resistivity corridor indicates that the lithospheric mantle has a low viscosity, which is favourable for shortening at shallow crustal levels under a regional compression environment. Furthermore, the low-resistivity anomalies in the west Qaidam Basin and southwest Qilian Shan form a passage that may connect with weak materials in the lower crust of Songpan-Ganzi terrane through the Qiman Tagh range. The high-resistivity lithospheric mantle of east Kunlun Shan, east Qaidam Basin, and Alashan is dislocated according to the surface boundaries, indicating a face-to-face subduction below Qilian Shan. This represents the major dynamic model in the northern Tibetan Plateau.
机译：北藏高原包括昆仑山北北部的地区，其特点是霸区流域系统和主要的防滑断层;然而，表观变形，横向不同。覆盖着北藏高原北部的磁通科（MT）数据的集合使得可以为整个研究区域应用这些数据的三维各向同性反演。 MT网站覆盖的平面区域超过700 x 700公里（2），最大的这些位点的最长时期近似或超过10,000秒。所有这些都有助于区分岩石树木地幔中深异常产生的弱响应。三维反转应用于MT数据的子集，并且观察到大多数MT站点的完全阻抗数据适合最终三维模型的响应。提出了北部北部岩石罩之间的两种关系。中等低电阻率走廊表明岩性地幔具有低粘度，这有利于在区域压缩环境下在浅地壳水平下缩短。此外，西柴达木盆地和西南祁连山的低电阻率异常形成了一条可以通过Qiman Tagh系列与松潘 - 甘孜地板下壳体的弱材料连接。 East Kunlun Shan，East Qaidam Basin和Alashan的高电阻率型材型披风根据表面界限脱位，表明祁连山以下面对面俯冲。这代表了北藏高原北部的主要动态模型。

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