东天山镜儿泉地区地壳电性结构特征及其地质含义  

Electrical structure of the crust in the Jingerquan region, eastern Tianshan orogenic belt and its geological implications

作　　者：郝泽江 张强[1,2] 龚胜平 赵克强[1,2] 李勇 陆桂福 苏文利[1,2] 付燕刚 段壮[1,2] 高健翁 林鲁军[1,2] 王振亮 HAO Zejiang;ZHANG Qiang;GONG Shengping;ZHAO Keqiang;LI Yong;LU Guifu;SU Wenli;FU Yangang;DUAN Zhuang;GAO Jianweng;LIN Lujun;WANG Zhenliang(Institute of Geophysical and Geochemical Exploration,CAGS,Langfang,Hebei 065000,China;National Center for Geological Exploration Technology,Langfang,Hebei 065000,China)

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [2]国家现代地质勘查工程技术研究中心,河北廊坊065000

出　　处：《地质学报》2025年第2期417-427,共11页Acta Geologica Sinica

基　　金：中国地质调查局项目(编号DD20230309,DD20221639);科技部基础资源调查专项资助(编号2022FY101800);国家重点研发计划项目(编号2018YFE0208300);国家自然科学基金项目(编号41504063,42202106)联合资助的成果。

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。To gain a comprehensive understanding of the electrical structure and geological structural characteristics of the Jingerquan region in eastern Tianshan,and to provide electrical evidence for its metallogenic mechanism,a magnetotelluric sounding profile was completed in the area.By utilizing three-dimensional inversion,a reliable electrical structure model was obtained.The results revealed the following insights:①the shallow part of the Kangur-Huangshan ductile shear zone exhibits a thin layer of high conductivity.This suggests that the shallow surface rock layer may have undergone significant ductile shear deformation,leading to the presence of fractured and loose rock,potentially accompanied by fluids;②the Yamansu fault serves as a channel for fluid transport to greater depths,causing the fractures below it to exhibit high conductivity anomalies;③the mineralization model of the Hulu copper-nickel sulfide deposit is consistent with the magma channel mineralization model.The Kangur Fault serves as a pathway for the upward intrusion of mantle-derived magma.During this process,the magma carries copper-nickel sulfides,which subsequently undergo gravitational subsidence and aggregate mineralization at bends in the channel,magma chambers,or dilation sites.Additionally,it is speculated that there may be sulfide-rich basic rocks at a depth of 2 km,suggesting the potential for Cu-Ni metallogenic at that depth.

关 键 词：东天山镜儿泉地区 大地电磁探测 地壳电性结构 成矿作用 

分 类 号：P61[天文地球—矿床学]