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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。
In this paper, the direct dating of molybdenite Re-Os in ores of the typical Dabaite porphyry Cu-Mo ore deposit in the western Tianshan Mountains is studied. Based on the regional geological evolution and other chronological data, METEOROLOGICAL GEOCHEMICAL BACKGROUND AND ORE - FORMING MECHANISM OF THE PORPHYRY COPPER - POLYMETALLIC ORE BELT IN CHINA. The results show that the Re-Os age of molybdenite in the Da-Baotu deposit is 301 ± 20Ma, indicating that the mineralization took place in the Late Carboniferous. The ore deposit is formed in the Biezhentao-Koguid Carboniferous arch belt. Diagenesis and mineralization are closely related to the subduction southward of the Bayinou oceanic crust in the Carboniferous. The possible metallogenic mechanism is due to the southward crust uplift of the Sailimu uplift Subduction with continental basement and thrusting of basal arc basement faults to the north lead to a series of moderate-acid magmatic activities related to porphyry deposits, and deep faults in the area provide the conditions for the magmatic intrusion.