阿尔金-东昆仑造山带铜镍矿成矿地质条件与找矿前景  

Metallogenic Geological Conditions and Regularity of Magmatic Cu-Ni Sulfide Deposits in the Altyn-East Kunlun Orogenic Belt,Xinjiang

作　　者：陈建中[1] 夏昭德[2] 王驰源 丁海波 张朋[1] 王厚方 Chen Jianzhong;Xia Zhaode;Wang Chiyuan;Ding Haibo;Zhang Peng;Wang Houfang(The Third Geological Branch,Xinjiang Geological and Mineral Bureau,Kuerle,841000,Xinjiang,China;School of Earth Science and Resources,Chang’an University,Xi’an,710054,Shaanxi,China;Xinjiang Uygur Autonomous Region Natural Resources Reform and Development Research Center,Urumqi,830002,Xinjiang,China)

机构地区：[1]新疆维吾尔自治区地质矿产勘查开发局第三地质大队,新疆库尔勒841000 [2]长安大学地球科学与资源学院,陕西西安710054 [3]新疆维吾尔自治区自然资源改革发展研究中心,新疆乌鲁木齐830002

出　　处：《新疆地质》2024年第2期238-243,共6页Xinjiang Geology

基　　金：新疆维吾尔自治区重点研发任务专项(2023B03006-5);新疆维吾尔自治区自然科学基金资助项目(2022D01B81)联合资助。

摘　　要：基于阿尔金-东昆仑造山带基性-超基性岩分布和铜镍矿找矿勘查进展,梳理该区铜镍矿产特征和成矿规律,指出下一步找矿方向。研究显示,阿尔金-东昆仑造山带铜镍矿成矿期分为4期:元古代(1 118 Ma)、奥陶—泥盆纪(465~405 Ma)、二叠纪(270 Ma)、三叠纪(244 Ma),元古代铜镍成矿作用主要与热液作用有关,后3期主要与岩浆熔离作用有关,并有热液作用的叠加。奥陶—泥盆纪幔源岩浆活动强烈,多分布于阿尔金南缘断裂及次级断裂附近,岩体岩相分带清楚,岩浆分异充分,成矿前景大,是阿尔金-东昆仑地区寻找铜镍硫化物矿床的优选方向。受构造作用影响,该期基性-超基性岩与蛇绿岩套镁质橄榄岩共存同一空间,需加强对该时期铁质基性-超基性岩体的综合评价。二叠—三叠系岩体多以辉长岩为主,已发现的超镁铁质岩石赋存有铜镍矿化体,为该区寻找铜镍矿的次要方向。Based on the distribution of basic-ultrabasic rocks and the progress of Cu-Ni ore prospecting in Altun and East Kunlun orogenic belt,Xinjiang,the paper reviews the characteristics and metallogenic regularity of Cu-Ni deposits in this area,and points out the future prospecting direction.The results show that the mineralization periods of the Cu-Ni deposits in the Aljin-East Kunlun orogenic belt can be divided into four periods:Proterozoic(1118 Ma),Ordovician-Devonian(465-405 Ma),Permian(~270 Ma)and Triassic(~244 Ma).The Proterozoic Cu-Ni mineralization is mainly related to hydrothermal processes.The latter three stages are mainly related to magmatic dissociation and superposed with hydrothermal mineralizaiton.The Ordovician and Devonian mantle-derived magmatic activity is widespread near the Altun southern margin fault and its secondary fault,with clear lithofacies zonation,sufficient magmatic differentiation,and they are of great metallogenic prospects.It is the preferred direction to search for Cu-Ni sulfide deposits in the Altun East Kunlun area,but due to the influence of tectonic processes,the ferric basic-ultrabasic rocks coexist with the magnesia peridotite of the ophiolite suite in this period in the same space,so it is necessary to strengthen the comprehensive evaluation of the ferric-ultrabasic rock mass in this period.At the same time,the Permian-Triassic intrusions is dominated by gabbro,but the ultramafic rocks have been found to contain copper-nickel mineralized bodies,so the Permian-Triassic intrusions has certain prospecting prospects,and is the secondary direction of searching for copper-nickel ore in this area.

关 键 词：东昆仑 阿尔金 铜镍硫化物矿床 奥陶纪-泥盆纪岩体 成矿期次 找矿前景 

分 类 号：P618.41[天文地球—矿床学] P618.63[天文地球—地质学]