| 郑 杰.新疆小红山铜矿黄铁矿微量和稀土元素地球化学特征[J].地质与勘探,2015,51(6):1096-1106 |
| 新疆小红山铜矿黄铁矿微量和稀土元素地球化学特征 |
| REE composition and trace element features of pyrite in the Xihaohongshan copper deposit, Xinjiang |
| 投稿时间：2015-06-30 修订日期：2015-10-15 |
| DOI： |
| 中文关键词: 地球化学 黄铁矿 微量元素 成矿流体 阿勒泰南缘 |
| 英文关键词: geochemistry, pyrite, trace element, ore-forming fluid, Altai south edge |
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| 中文摘要: |
| 小红山铜矿位于阿勒泰塔拉特-大东沟-莫尤勒特金属成矿带中，是与英安质-流纹质火山活动相关的铜矿床。文章利用黄铁矿中的稀土元素、微量元素组成示踪了该矿床成矿物质及成矿流体的来源和性质。研究结果表明小红山铜矿黄铁矿和霏细岩稀土元素总量较高，黄铁矿ΣREE总量均值为168.81×l0-6，霏细岩略低，ΣREE总量均值为154.10×l0-6；黄铁矿和霏细岩样品稀土配分模式均为明显右倾的轻稀土富集模式，轻稀土分异较强、而重稀土元素分异较弱；黄铁矿具明显δEu负异常、而δCe无明显异常，表明该矿床产出于具还原性的活动大陆边缘环境，并在后期遭受变质热液的叠加改造。矿床黄铁矿富集LREE,亏损HFSE，Hf/Sm、Nb/La和Th/La比值小于1，推断小红山铜矿床成矿流体为富Cl流体。黄铁矿杂质元素Co/Ni比值表明，矿床成因以变质热液为主，矿床形成于中温。Y/Ho比值示踪成矿流体表明，矿床成矿流体与弧后盆地的成矿热液相似，黄铁矿与霏细岩Y/Ho比值的高度相似性也为围岩（霏细岩）提供了部分成矿物质或两者都受到了相同成矿热液的影响提供了新的证据。 |
| 英文摘要: |
| The Xiaohongshan copper deposit is located in the Talate-Dadonggou-Moyoulete metallogenic belt in the Altay region. This deposit is related with dacite-rhyolitic volcanic activity. The ore-forming materials and metallogenic fluid resources have been traced by REEs and trace elements in this study. The results show that the REE contents of pyrite and felsite in the Xionghongshan deposit is high;ΣREE average value of pyrite is 168.81×l0-6, and that of felsite is 154.10×l0-6 which is slightly lower. REE distribution patterns of pyrite and felsite samples show characters of an obviously right declined curve, strong LREE differentiation, and weak HREE differentiation. Pyrite has obvious negative anomalies of δEu, and unapparentδCe anomalies. The above characters indicate that the Xiaohongshan deposits is produced in a reducing active continental margin, and then suffered metamorphic hydrothermal transformation. The pyrite of this deposit is rich in LREE, deficit of HFSRE, and less than 1 of Hf/Sm, Nb/La and Th/La ratios, so metallogenic fluid is rich in chloride fluid. Co/Ni ratio of pyrite indicates that the genesis of this deposit is metamorphic hydrothermal, and the deposit was formed at middle-low temperature. Y/Ho ratio shows that the metallogenic fluid of deposit is similar to that of back-arc basin; Y/Ho ratio of both pyrite and felsite has similar values, which provides new evidence that the surrounding rock of felsite provided partial ore-forming materials, or both pyrite and felsite are affected by the same metallogenic hydrothermal fluid. |
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