| 浙西大铜坑斑岩型钨钼矿床成岩成矿年代学 |
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| 引用本文： | 胡开明,唐增才,孟祥随,周汉文,董学发,杜雄,陈忠大.浙西大铜坑斑岩型钨钼矿床成岩成矿年代学[J].地球科学,2016,41(9):1435-1450. |
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| 作者姓名： | 胡开明 唐增才 孟祥随 周汉文 董学发 杜雄 陈忠大 |
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| 作者单位： | 1.浙江省地质调查院，浙江杭州 311203 |
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| 基金项目： | 浙江省国土资源厅地勘资金项目200702浙江省国土资源厅地勘资金项目201400中国地质调查局地质调查项目12120114068901 |
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| 摘 要： | 浙西淳安大铜坑斑岩型钨钼矿位于扬子陆块东南缘，矿体主要产于花岗岩体与南华系休宁组变质砂岩内外接触带上，是揭示浙皖赣相邻区域成矿规律的重要组成.成矿花岗岩为高钾钙碱性系列准过铝质Ⅰ型花岗岩，岩石富集Rb、K，亏损Sr、Ba等大离子亲石元素，富集Th、U，相对亏损Nb、Ta、Ti等高场强元素，稀土元素含量较低(ΣREE=106.2×10-6~211.5×10-6)，轻重稀土分异明显(ΣLREE/ΣHREE=6.4~12.2)，中等的Eu负异常(δEu=0.50~0.63)，具有类似岛弧岩浆岩的特征.锆石SHRIMP U-Pb定年结果表明花岗岩侵位时间为148.3±1.9 Ma，辉钼矿Re-Os等时线年龄显示成矿作用发生于146.47±0.81 Ma，成岩年龄与成矿时代高度耦合，进一步证实钨钼成矿作用与花岗岩体的形成有着密切的成因联系，二者在时间上是一个连续的过程，形成于晚侏罗世古太平洋板块俯冲挤压的构造环境，也是华南地区中生代第2次大规模钨钼成矿作用延续到浙西的响应.
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| 关 键 词： | 锆石SHRIMP U-Pb年龄 辉钼矿Re-Os年龄 地球化学 年代学 大铜坑钨钼矿 花岗岩 浙西 |
| 收稿时间： | 2016-01-11 |
Chronology of Petrogenesis and Mineralization of Datongkeng Porphyry W-Mo Deposit in West Zhejiang |
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| Abstract: | As an important component to reveal the metallogenic regularity in the Zhejiang-Anhui-Jiangxi border region, the Datongkeng porphyry W-Mo deposit in Chun'an County is located in the southeastern margin of the Yangtze block, and the W-Mo ore bodies are mainly located in the internal or external contact zones between granite and sandstone of Xiuning Formation. The Datongkeng granite is characterized by quasi-aluminous, showing the nature of Ⅰ-type granite and high-K calc-alkalic series rock. The granite is rich in Rb, K, Th, U, and relatively depleted in Sr, Ba, Nb, Ta, Ti. The total REE contents are relatively low (ΣREE=106.2×10-6-211.5×10-6), and the rocks show obvious LREE and HREE fractionation (ΣLREE/ΣHREE=6.4-12.2), moderately negative Eu anomalies (δEu=0.50-0.63), suggesting that these rocks have the characters of typical volcanic arc rocks. The SHRIMP U-Pb zircon age of 148.3±1.9 Ma for granite is close to the Re-Os isochron age of 146.47±0.81 Ma for five molybdenite samples from the Datongkeng W-Mo deposit, indicating magmatism and mineralization are a continuous process, which took place in the compression tectonic environment related to the subduction of pacific plate at Late Jurassic, and corresponds to the second large-scale W-Mo mineralization in South China. |
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