摘要
新疆西天山博罗科努成矿带东段近年来找矿成果丰硕,相继发现了可克萨拉-艾木斯呆依、哈勒尕提-木祖克、色勒特果勒和肯登高尔4个矽卡岩型多金属矿床,其成矿岩体分别为呼斯特、大瓦布拉克、埃姆劲和纳林果勒岩体。在矿区系统地质调查的基础上,本文对4个成矿岩体开展了岩石地球化学研究,分析了矿床的成矿背景、控矿因素和找矿潜力。研究表明,本区矽卡岩矿床的成矿岩体具有高硅、低镁、准铝-弱过铝质、富碱且富钾的特征,呼斯特和大瓦布拉克岩体形成于北天山洋向南部伊犁地块俯冲背景,埃姆劲和纳林果勒岩体形成于碰撞造山环境;成矿受"中酸性侵入岩-钙质地层-接触带及捕虏体构造"三位一体联合控制。综合分析研究认为,区域上岩体与呼独克达坂组(O3h)和东图津河组(C2dt)钙质地层的接触带、可克萨拉-艾木斯呆依矿区外围的灰岩捕虏体、肯登高尔矿区深部隐伏的花岗闪长岩与东图津河组(C2dt)地层接触带具有较大的找矿潜力。
In recent years,several important skarn-type Fe-Cu polymetallic deposits,including Kekesala-Aimusidaiyi,HalegatiMuzuke,Seleteguole and Kendenggaoer that are related to the plutons of Husite,Dawabulake,Aimujin and Nalinguole,respectively,have been discovered in the eastern segment of the Boluokenu metallogenic belt of the West Tianshan,Xinjiang. The purposes of this paper are to outline geology and geochemistry of the ore-related plutons and to evaluate the metallogenetic setting,ore-controlling factors and exploration potentials in this segment. The ore-related plutons typically have high SiO_2 and low MgO contents and are metaluminous to weakly peraluminous and enriched in K_2O and alkalis（ K_2O ＋ Na_2O）. The Husite and Dawabulake plutons formed in a subduction setting of the North Tianshan Ocean southward under the Yili massif,whereas the Aimujin and Nalinguole plutons originated in a postcollisional setting. Skarn-type Fe-Cu mineralization is jointly controlled by the intermediate to acidic intrusions,calcareous sedimentary rocks,contact zones and xenolith structures. It is suggested that great exploration potentials should exist in the areas including the contact zones between the plutons and calcareous strata of the Hudukedaban（O_3h） and Dongtujinhe（ C_2dt） formations,the limestone xenolith in the periphery of the Kekesala-Aimusidaiyi deposit,and the contact zones of the hidden granodiorite with the Dongtujinhe Formation（ C_2dt） in the Kendenggaoer deposit.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2016年第5期1315-1332,共18页
Acta Petrologica Sinica
基金
国家自然科学基金项目(41572062
U1303292
41302064)
中央返还两权价款资金综合研究项目(Y15-1-LQ04)
国家科技支撑计划项目(2011BAB06B02-02)联合资助
关键词
铁铜多金属矿床
矽卡岩矿床
成矿背景
博罗科努
西天山
Fe-Cu polymetallic deposit
Skarn deposit
Metallogenic setting
Boluokenu
West Tianshan
