新疆西昆仑钼矿床类型与成矿时代
首发时间:2015-11-10
摘要:西昆仑地区发育完整的研究热液矿床钼矿床,其类型包含斑岩型、矽卡岩型、石英脉型钼矿。对库克西力克矽卡岩型钼矿床开展了成矿成矿年代学研究,获得了成矿岩体花岗岩锆石LA-ICPMS年代学为203.8±4.2Ma,以及矿石中辉钼矿Re-Os年龄为212.0± 2.2Ma,显示成矿成矿年代一致,代表了早中生代陆缘弧岩浆岩成矿事件。结合目前所获的成岩成矿年代学资料,将西昆仑地区钼矿成矿划分为两个重要成矿时期,同时分别代表了不同的成矿环境:早古生代产于多岛洋格局中岛弧环境的石英脉型-矽卡岩-斑岩型钼矿床和晚古生代-早中生代产于大陆边缘弧环境的斑岩型-矽卡岩型钼矿床。
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The ore types and ages of molybdenum deposits in Western Kunlun, Xinjiang
Abstract:Complete series of hydrothermal ore-forming systems have found in Western Kunlun, including porphyry, skarn and vein ore types. The U-Pb LA-ICP-MS dating of the zircon from gneissic granite of Kukexilike skarn molybdenum deposit yields an age of 203.8±4.2Ma. Re-Os dating of molybdenite separated from the skarn ores gives a model age of 212.0±2.2Ma. These ages suggest that the mineralization in the Kukexilike skarn molybdenum deposit is a product of early Mesozoic hydrothermal ore-forming events. According ages of magmatism and mineralization, two periods of molybdenum mineralization are recognized in Western Kunlun: one period is early Paleozoic, which porphyry-skarn-vein ore type molybdenum deposits are formed in island arc environment; another period is late Paleozoic to early Mesozoic, which porphyry-skarn type molybdenum deposits are formed in continental arc environment.
Keywords: Economic geology molybdenum deposits ore types mineralization ages Western Kunlun
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No.4660135107684914****
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