Crustal structure and magma plumbing system beneath the Puer Basin, southwest China: Insights from three-dimensional magnetotelluric imaging
Crustal structure and magma plumbing system beneath the Puer Basin, southwest China: Insights from three-dimensional magnetotelluric imaging
复制标题
中国西南部普洱盆地地壳结构和岩浆管道系统：三维大地电磁成像的见解
DOI：
10.1016/j.tecto.2019.04.032
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发表时间：
2019-07
期刊：
影响因子：
2.9
通讯作者：
Wang Libo
中科院分区：
文献类型：
--
作者：
Cheng Yuanzhi;Tang Ji;Chen Xiaobin;Dong Zeyi;Wang Libo
普洱盆地是扬子陆块与特提斯造山带的碰撞部位，是研究岩浆演化、陆内地震和热液系统的有利地区。针对这些问题，利用覆盖普洱盆地的沿着8条剖面的320 ~ 0.001 Hz宽频带大地电磁资料，建立了普洱盆地的三维电性模型。复杂的地下模型充满了充满流体的断裂带、部分熔融网络、区域断层和冷岩体。在普洱盆地10 ~ 35 km深处存在两条3-10 Ωm的高导带。估计的熔体分数是在4-26体积%的范围内，这是需要考虑到所观察到的高电导率在地壳的基础上制定的多个导电模型和电阻率从三维大地电磁反演。中、下地壳的部分熔融既可能是地幔源区岩浆侵入的结果，也可能是扬子陆块俯冲到特提斯造山带之下的脱水作用的结果。在三维电性模型的基础上，结合地壳各向异性、热结构、位场和地震勘探成果，对热液系统的形成机制、地震构造和深部孕震背景有了较为全面的认识。
The Puer Basin region, where Yangtze continental block and the Tethyan orogen collide, provides a favorable area for studying the processes of magmatic evolution, intracontinental earthquakes and hydrothermal systems. Focused on these issues, we have acquired a three-dimensional electrical model of the Puer Basin in southern Yunnan, using broadband magnetotelluric data extending from 320 to 0.001 Hz along eight profiles covering the Puer Basin. The complex subsurface model is filled with zones of fluid-filled fracture, partial melt networks, regional faults, and cold plutons. There are two highly conductive zones (3–10 Ωm) beneath the Puer Basin from 10 km to 35 km in depth. The estimated melt fractions are in the range of 4–26 vol%, which is required to account for the observed high conductivities in the crust based on the formulation of the multiple conduction models and resistivity from the three-dimensional magnetotelluric inversion. The partial melt in the middle and lower crust may have been derived from either magma intrusion of the mantle sources or the dehydration processes in the slab subducting of Yangtze continental block beneath the Tethyan orogen in southern Yunnan. Based on the three-dimensional electrical model, integrating with crustal anisotropy, thermal structure, potential field and seismic survey results, we have a more comprehensive understanding of the mechanism of the hydrothermal system, seismotectonics, and deep seismogenic background.
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