中亚成矿域西部巴尔喀什—准噶尔成矿带晚古生代成矿作用大爆发  

Late Paleozoic Concentrated Mineralization of Balkhash-Junggar Metallogenic Belt in the Western Part of the Central Asian Metallogenic Domain

作　　者：陈宣华[1] 陈正乐[2] 白彦飞[3] 韩淑琴[2] 丁伟翠[1] 李江瑜 施炜[2] 叶宝莹[4] 

机构地区：[1]中国地质科学院地球深部探测中心,北京100037 [2]中国地质科学院地质力学研究所,北京100081 [3]山西省水利水电勘测设计研究院,山西太原030024 [4]中国地质大学(北京)地质调查研究院,北京100083

出　　处：《地球科学与环境学报》2016年第3期285-305,共21页Journal of Earth Sciences and Environment

基　　金：中国地质调查局地质大调查项目(12120113079400;1212011120184);"十一五"国家科技支撑计划项目暨国家305项目(2007BAB25B02);深部探测技术与实验研究专项项目(SinoProbe-08)

摘　　要：巴尔喀什—准噶尔成矿带主要由巴尔喀什成矿带、西准噶尔成矿带和东准噶尔成矿带组成,是中亚成矿域西部重要的晚古生代成矿带。巴尔喀什—准噶尔成矿带产出有大量著名的大型—超大型斑岩型铜钼矿床(科翁腊德、阿克斗卡、博尔雷和包古图)、大型矽卡岩型铜矿床(萨亚克)、大型稀有金属矿床(东科翁腊德、扎涅特和阿克沙套)和大型造山带型金矿床(哈图)等。锆石U-Pb测年,辉钼矿Re-Os测年,角闪石、白云母、黑云母和钾长石40 Ar/39 Ar热年代学,锆石和磷灰石裂变径迹、(U-Th)/He测年和热历史模拟,限定了金属矿床从深部形成到地表剥露的全过程热演化历史。热年代学研究揭示该地区晚古生代与岛弧/大陆弧有关的深成岩浆侵入活动和同时代的金属成矿作用、晚古生代—早中生代的中温区域冷却历史以及中生代以来金属矿床的剥露作用。综合花岗岩类地球化学和年代学研究结果,该地区经历了从晚石炭世大洋板块的俯冲到早二叠世陆内伸展作用的构造环境转换;在此构造转换时期,发生了金属铜、钼、稀有金属和金成矿作用的大爆发,可称之为中亚成矿域西部"晚古生代成矿作用大爆发"。矽卡岩型铜矿、斑岩型铜(钼)矿、云英岩-石英脉型钼钨矿和造山带(石英脉)型金矿构成了巴尔喀什—准噶尔成矿带晚古生代成矿作用大爆发完整的区域成矿系列。The Balkhash-Junggar metallogenic belt consists of Balkhash,West Junggar and East Junggar metallogenic belts in the western part of the Central Asian metallogenic domain.It is animportant metallogenic belt with occurrence of many well-known super-large and large porphyry Cu-Mo deposits（such as Kounrad,Aktogai,Borly and Baogutu）,large skarn Cu deposits（such as Sayak）,large rare metal deposits（such as East Kounrad,Zhanet and Akshatau）and large orogenic Au deposits（such as Hatu）.Zircon U-Pb dating,Re-Os dating of molybdenite,40 Ar/39 Ar thermochronology of hornblende,muscovite,biotite and K-feldspar,and fission track and（U-Th）/He dating of zircon and apatite and thermal history modeling,provide a multidisciplinary approach to constrain the whole thermo-history of metallic deposits from their formation in the deep to the exhumation in the surface.It reveals the arc-related granitic magmatism and the metallogenesis of skarn Cu,porphyry Cu-Mo,quartz-vein/greisen W-Mo and orogenic Au in Late Paleozoic,the medium-temperature regional cooling history in Late Paleozoic-Early Mesozoic,and the low-temperature exhumation of the deposits in Mesozoic.The timing combined with geochemistry of granitoids suggests a transition of tectonic environment from subduction and volcanic arc in Late Carboniferous to post-orogenic extension in Early Permian,and the concentrated mineralization of Cu,Mo,rare metals and Au during this tectonic transition.The complete metallogenic series for Late Paleozoic concentrated mineralization of Balkhash-Junggar metallogenic belt in the western part of the Central Asian metallogenic domain are skarn Cu,porphyry Cu-Mo,quartz-vein/greisen Mo-W,and orogenic（quartz-vein）Au deposits.

关 键 词：晚古生代 地壳生长 成矿带划分 成矿系列 成矿作用 热年代学 巴尔喀什—准噶尔成矿带 中亚成矿域 

分 类 号：P612[天文地球—矿床学]