新疆西天山达巴特铜矿床地质特征和成矿时代研究  

Geology and Metallogenetic Epoch of the Dabate Porphyry Copper Deposit in West Tianshan Mountains,Xinjiang

作　　者：张作衡[1] 毛景文[1] 王志良[1] 杜安道[2] 左国朝[3] 王龙生[1] 王见蓶 屈文俊[2] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]国家地质实验测试中心,北京100037 [3]甘肃省地质调查院,兰州730000 [4]新疆有色地勘局七○三地质队,伊宁835100

出　　处：《地质论评》2006年第5期683-689,共7页Geological Review

基　　金：国家自然科学基金资助项目(编号40573028;40402012);地质调查项目(编号1212010561603-3)的成果。

摘　　要：本文通过对西天山地区比较典型的达巴特斑岩铜钼矿床矿石中辉钼矿Re-Os的直接定年研究,结合区域地质演化和其他年代学资料,探讨了西天山赛里木和博罗科努地区斑岩铜多金属成矿带的成矿地球动力学背景和成矿机制。结果显示达巴特矿床中辉钼矿Re-Os年龄为301±20Ma,表明成矿作用发生于晚石炭世。矿床形成于别珍套—科古琴石炭纪岛弧带,成岩成矿与石炭纪巴音沟洋壳向南的俯冲作用密切相关,可能的成矿机制是由于洋壳向南对赛里木隆起带陆壳基底的俯冲,岛弧基底断裂系向北逆冲,导致一系列与斑岩矿床有关的中酸性岩浆活动,区域深大断裂为岩浆的上侵提供了条件。This paper carried out Re-Os dating from the Dabate deposit, deposit in western Tianshan Mountains, Xinjiang. Combining a typical porphyry copper molybdenum regional geological evolution and other dating data, we attempt to discuss the metallogenetic dynamic setting and ore-forming mechanism of the copper-poly-metallic ore belt in Sayram--Boluokenu. As a result, the mineralization age of the Dabate deposit is 301±20Ma. This data may reveal that the mineralization occurred in the late Carboniferous. The related magmatic activities were simultaneous with the porphyry mineralization or a little earlier than mineralization. The deposit formed in the＇Biezhentaw-Kokirqin Late Paleozoic inland arc and the mineralization is originated from the subduction of Carboniferous Bayingou oceanic crust to south to Sayram-Boluokenu lift. During the subduction, the inland arc continental crust basement faults thrust to north and a series of porphyry copper ore related middle-acid magma formed and migrated from low to up along the regional deep fault.

关 键 词：达巴特 斑岩铜矿床 Re—Os同位素测年 西天山 新疆 

分 类 号：P618.41[天文地球—矿床学]