| 福建紫金山矿田晚中生代英安玢岩形成时代及其成矿意义 |
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| 引用本文： | 胡春杰,黄文婷,包志伟,梁华英,王春龙.福建紫金山矿田晚中生代英安玢岩形成时代及其成矿意义[J].大地构造与成矿学,2012,36(2):284-292. |
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| 作者姓名： | 胡春杰 黄文婷 包志伟 梁华英 王春龙 |
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| 作者单位： | 1. 中国科学院广州地球化学研究所,广东广州510640;中国科学院研究生院,北京100049
2. 中国科学院广州地球化学研究所,广东广州,510640 |
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| 基金项目： | 国土资源部深部，中国科学院重大项目，国家自然科学基金 |
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| 摘 要： | 福建紫金山Cu-Mo-Au-Ag多金属矿田是一个完整的斑岩-浅成低温热液矿床成矿体系。英安玢岩主要分布在紫金山Au-Cu矿床内火山机构及其附近,与高品位Au-Cu矿体空间上联系密切,是矿田内火山-侵入岩浆过程的一个重要环节。采自矿区的两个英安玢岩样品LA-ICP-MS锆石U-Pb定年结果分别为(105.0±0.7)Ma(MSWD=0.83)和(105.0±2.2)Ma(MSWD=1.70),其形成时代与区内Mo-Cu矿化的萝卜岭和四方岩体形成时代相近。三个岩体形成时代及地球化学特征的相似性表明它们应为同源岩浆演化的产物,它们均具有较高的锆石Ce4+/Ce3+值,即岩浆体系具有较高的氧逸度,与区内斑岩成矿体系巨量金属堆积的地质事实相一致。英安玢岩的精确定年表明,紫金山Cu-Au矿与萝卜岭Mo-Cu矿及四方岩体有关的Mo矿床为同一斑岩成矿体系的产物。
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| 关 键 词： | 年代学 英安玢岩 锆石Ce4+/Ce3+ 氧逸度 紫金山矿田 |
LA-ICP-MS Zircon U-Pb Dating of the Dacite Porphyry from Zijinshan Cu-Au Deposit and its Metallogenetic Implications |
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| HU Chunjie
,
HUANG Wenting
,
BAO Zhiwei
,
LIANG Huaying
,
WANG Chunlong.LA-ICP-MS Zircon U-Pb Dating of the Dacite Porphyry from Zijinshan Cu-Au Deposit and its Metallogenetic Implications[J].Geotectonica et Metallogenia,2012,36(2):284-292. |
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| Authors: | HU Chunjie HUANG Wenting BAO Zhiwei LIANG Huaying WANG Chunlong |
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| Institution: | 1,2 (1.CAS Key Laboratory for Mineralogy and Metallogeney, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China; 2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China) |
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| Abstract: | The dacite porphyry occurs in the volcanic caldera of Zijinshan ore field and closely associates with the Cu-Au mineralization. The LA-ICP-MS zircon U-Pb dating of two dacite porphyry samples yields weighted mean ages of (105.0±0.7)Ma and (105.0±2.2)Ma, respectively. These results suggest that the dacite porphyry was formed proximately contemporarily with the other two Mo and Cu mineralized granite porphyries, i.e., the Sifang and Luoboling granite porphyries. The dacite and granite intrusives are characterized by high Ce4+/Ce3+ ratios, which indicates that the magmatic system was of oxidative and therefore consistent with the huge Cu-Mo-Au ore-forming potential of the dacite and granite porphyries. Moreover, the similarities of age, geochemical characteristics and mineralization demonstrate that the Cu-Mo-Au mineralization in the Zijinshan ore field is most likely a unified porphyry ore-forming system. |
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| Keywords: | dacite porphyry chronology zircon Ce4+/Ce3+ oxygen fugacity Zijinshan |
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