东天山镜儿泉地区地壳电性结构特征及其地质含义
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中国地质科学院地球物理地球化学勘查研究所

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新疆东天山等重点成矿区带浅覆盖区铜镍多金属矿调查(DD20230309);科技基础资源调查专项资助(No.2022FY101800);国家重点研发计划项目(2018YFE0208300);国家自然科学(41504063,42202106);重点地区地球物理调查(No.DD20221639)资助.


Electrical Structure of the Crust in the Jingerquan Region, Eastern Tianshan and Its Geological Implications
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Institute of Geophysical and Geochemical Exploration,CAGS

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    摘要:

    为了研究东天山镜儿泉成矿区深部电性结构及其构造特征,并为其成矿机制提供电性依据,在东天山镜儿泉成矿区完成了一条大地电磁测深剖面。通过大地电磁三维反演,获得了可靠的的电性结构模型。研究表明:(1)康古尔-黄山韧性剪切带浅部存在低阻薄层,在强烈的韧性剪切变形作用下,浅地表岩层可能比较破碎松散,容易赋存流体。(2)雅满苏断裂为流体向深部运移提供了通道,使断裂下方表现为低阻异常。(3)葫芦铜镍硫化物矿床成矿模式符合岩浆通道成矿模型,康古尔断裂为幔源岩浆提供了向上侵入的通道,携带铜镍硫化物的岩浆在通道转折、岩浆房或膨大部位发生重力沉降和聚集成矿;推测在2 km深的地方可能存在富含硫化物的基性岩体,暗示深部可能存在铜镍成矿潜力。

    Abstract:

    To understand the electrical structure and geological structural characteristics of the Jingerquan region, eastern Tianshan, and to provide electrical evidence for its metallogenic mechanism, a magnetotelluric sounding profile was completed in the Jingerquan region, eastern Tianshan. A reliable electrical structure model was obtained by three-dimensional inversion. The results revealed that:(1)The shallow part of Kangur-Huangshan ductile shear zone has a high conductivity thin layer, under the strong ductile shear deformation, the shallow surface rock layer may be relatively broken and loose, thus endowed with fluids.(2)The Yamansu Fault provides a channel for fluid transport to depth, causing the fracture to exhibit high conductivity anomalies below it.(3)The mineralization model of the Hulu copper-nickel sulfide deposit is consistent with the magma channel mineralization model, where the Kangur Fault provides a channel for upward intrusion of the mantle-derived magma, and the magma carrying copper-nickel sulfides undergoes gravitational subsidence and aggregation mineralization at the channel turn, magma house or dilatation site; It is speculated that there may be basic rocks rich in sulfide at the depth of 2 km, suggesting that there may be Cu-Ni metallogenic potential in the depth.

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  • 收稿日期:2023-03-16
  • 最后修改日期:2023-08-01
  • 录用日期:2023-10-07
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