| 西藏驱龙斑岩铜矿铜同位素研究 |
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| 引用本文： | 李振清,杨志明,朱祥坤,侯增谦,李世珍,李志红,王跃.西藏驱龙斑岩铜矿铜同位素研究[J].地质学报,2009,83(12):1985-1996. |
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| 作者姓名： | 李振清 杨志明 朱祥坤 侯增谦 李世珍 李志红 王跃 |
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| 作者单位： | 1. 中国地质科学院矿产资源研究所,北京,100037;中国地质大学地质过程与矿产资源国家重点实验室,北京,100083
2. 中国地质科学院地质研究所,北京,100037 |
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| 基金项目： | 国家自然科学基金重点项目，国家杰出青年科学基金项目(编号 40425014)资助的成果 |
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| 摘 要： | 本文通过Cu的同位素组成示踪斑岩型铜矿床Cu的来源,探讨岩浆-热液过程中Cu同位素的分馏.选择驱龙矿区从早到晚的三期热液脉以及早期钾硅酸盐化蚀变同期的样品,挑选新鲜的黄铜矿,测定其Cu同位素组成.早期A脉:为不规则石英-钾长石脉、石英-硬石膏脉及黑云母脉,δ~(65)Cu的范围为-0.44‰～-0.09‰,集中在-0.44‰～-0.31‰,平均值-0.29‰;B脉,为石英+硬石膏+黄铜矿±辉钼矿±黄铁矿脉和绿帘石-石英脉,δ~(65)Cu的范围为-0.42‰～+0.14‰,集中在-0.25‰～-0.18‰,平均值-0.18‰;晚期D脉,为板状黄铜矿-黄铁矿及黄铁矿脉,δ~(65)Cu的范围为-0.27‰～+0.47‰,集中在-0.27‰～-0.05‰,平均值-0.02‰;早期钾硅酸盐蚀变带,δ~(65)Cu的范围为-0.47‰～-0. 1‰,平均值-0.29‰.矿区铜同位素组成基本同岩浆岩一致(Zhu et al.,2000,2002;Maréchal et al.,1999,2002),表明Cu主要来自斑岩岩浆.不同期次热液的Cu同位素具有明显的分馏,早期相对富集~(63)Cu,晚期相对亏损~(63)Cu,A脉与B脉的同位素组成的差异可能与岩浆-热液演化过程有关,D脉的同位素组成差异可能是大气降水大量混入的结果.
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| 关 键 词： | 铜同位素 斑岩铜矿 驱龙 西藏 |
| 收稿时间： | 2009/8/22 0:00:00 |
| 修稿时间： | 2009/10/20 0:00:00 |
Cu isotope Composition of Qulong porphyry Cu deposit,Tibet |
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| LI Zhenqing,YANG Zhiming,ZHU Xiangkun,HOU Zengqian,LI Shizhen,LI Zhihong,and WANG Yue.Cu isotope Composition of Qulong porphyry Cu deposit,Tibet[J].Acta Geologica Sinica,2009,83(12):1985-1996. |
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| Authors: | LI Zhenqing YANG Zhiming ZHU Xiangkun HOU Zengqian LI Shizhen LI Zhihong and WANG Yue |
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| Abstract: | This paper tries to trace the source of Cu using the Cu isotope ratio of copper sulphides. According to form sequence, four types chalcopyrite from early potassic alteration, A vein, B vein and D vein were chosen separately. A vein mainly included irregular Quartz-K feldspar vein, Quartz-Anhydrite vein and Biotite vein, but the B vein were mainly composed by Quartz-Anhydrite-chalopyrite ± molybdenite ± pyrite vein and sericite-chlorite vein, and the D vein were mainly plate chalcopyrite-pyrite vein and pyrite vein. The range of δ65Cu of early potassic alteration is -0.47‰ to -0. 1‰, and the average value is -0.29‰. The δ~(65)Cu ratio of A vein is similar to potassic alteration in range and average value, and cluster from -0.44‰ to -0.31‰. The δ~(65)Cu of B vein is a little higher than A vein, with the range of -0.42‰ to +0.14‰ and the average value of -0.18‰, and cluster between -0.25‰ and -0.18‰. D vein, having the highest δ~(65)Cu range (-0.27‰ to +0.47‰) and average value (-0.02‰), cluster -0.27‰ to -0.05‰. The δ~(65)Cu ratio is consistent with that of which suggest that the Cu is mainly come from magma. Various type samples have significant Cu isotope fractionation, compare to early stage, later fluid relative enriched ~(65)Cu. The isotope fractionation between A vein and B vein maybe related to exsolution of the magma-fluid, while the distinction of D vein is more probable result from the mixing of rainwater. |
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| Keywords: | Cu isotope porphyry Cu deposit Qulong Tibet |
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