| 西藏冈底斯斑岩型铜钼矿床的Cu、Mo同位素组成及其意义 |
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| 引用本文： | 胡文峰,张烨恺,刘金华,郭亮,周炼.西藏冈底斯斑岩型铜钼矿床的Cu、Mo同位素组成及其意义[J].地球科学,2019,44(6):1923-1934. |
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| 作者姓名： | 胡文峰 张烨恺 刘金华 郭亮 周炼 |
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| 作者单位： | 中国地质大学地质过程与矿产资源国家重点实验室, 湖北武汉 430074 |
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| 基金项目： | 国家重大研发计划2016YFC0600309国家自然科学基金41473007国家自然科学基金41673013 |
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| 摘 要： | 选取西藏冈底斯成矿带的驱龙、达布斑岩型铜钼矿及鸡公村石英脉型钼矿为研究对象, 分别挑选含矿斑岩和石英脉中的黄铜矿、辉钼矿进行Cu、Mo同位素测定.结果表明, 西藏冈底斯斑岩型黄铜矿的δ65/63Cu介于0.01‰~0.98‰, 辉钼矿的δ97/95Mo介于-0.34‰~-0.15‰, 热液脉型矿床中辉钼矿的δ97/95Mo介于-0.35‰~-0.23‰.形成于陆-陆碰撞造山后的冈底斯斑岩型铜钼矿床的Cu同位素与俯冲带产出的斑岩型矿床中的Cu同位素组成具有一定的相似性, 均表现为单峰分布的特征.驱龙斑岩型矿床中热液脉与含矿斑岩中的δ65/63Cu具有一致性, 可能反映了二者在来源上具有一致性.在冈底斯斑岩型铜钼矿床中, 不同蚀变带具有不同的Cu、Mo同位素组成, 自蚀变中心向外, δ65/63Cu与δ97/95Mo表现出负相关趋势, 可能与成矿流体的性质密切相关.冈底斯石英脉型钼矿较斑岩型铜钼矿δ97/95Mo相对偏负, 结合两类矿床的成矿年代, 可能暗示两类矿床的成矿物质是同一源区连续演化的结果.
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| 关 键 词： | 西藏冈底斯成矿带 铜同位素 钼同位素 蚀变带 矿床 岩石学 |
| 收稿时间： | 2018-08-25 |
The Isotopic Compositions of Copper and Molybdenum from Porphyry Cu-Mo Deposit in the Gangdese,Tibet, and Their Significance |
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| Abstract: | We present Mo and Cu isotope of molybdenite and chalcopyrite from two porphyry deposits (Qulong, Dabu) and one quartz-molybdenite vein -type deposit (Jigongcun) along the Gangdese metallogenic belt in the Tibetan Plateau.The results show that the range of δ65/63Cu in the Gangdese porphyry deposit in Tibet is between +0.01‰-+0.98‰, and the range of δ97/95Mo is between -0.34‰ to -0.15‰.The δ97/95Mo of molybdenum in the quartz-molybdenite vein-type deposit is obviously lighter, and cluster from -0.35 ‰ to -0.23‰. Two types porphyry deposits produced in different tectonic settings from the island arc and collisional orogenic belt, it is found that they have similar range of δ65/63Cu in chalcopyrite, all of which are characterized by unimodal distribution; In contrast, the hydrothermal veins and ore-bearing porphyry from the Qulong porphyry deposit have a similar range of δ65/63Cu in chalcopyrite, which suggest that the origin of Cu is consistent. In addition, in the collisional orogenic belt porphyry deposit, different alteration zones have different Cu, Mo isotopic compositions, and from the center outward of the the alteration zone, Cu-Mo isotopic has a certain negative correlation, and this relationship have close relationship with the property of mineral fluid. Comparing the range of δ97/95Mo of the quartz vein type and porphyry type of deposits in the Gangdese area, it is found that the former has a lower δ97/95Mo, which may suggest that the ore sources of the two types of deposits are consistent. |
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