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德兴花岗闪长斑岩SHRIMP锆石U-Pb年代学和Nd-Sr同位素地球化学

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王强,赵振华,简平,许继峰,包志伟,马金龙. 德兴花岗闪长斑岩SHRIMP锆石U-Pb年代学和Nd-Sr同位素地球化学[J]. 岩石学报, 2004, 20(2): 315-324.
引用本文: 王强,赵振华,简平,许继峰,包志伟,马金龙. 德兴花岗闪长斑岩SHRIMP锆石U-Pb年代学和Nd-Sr同位素地球化学[J]. 岩石学报, 2004, 20(2): 315-324.
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WANG Qiang,ZHAO ZhenHua,JIAN Ping,XU JiFeng,BAO ZhiWei and MA JinLong Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China. SHRIMP zircon geochronology and Nd-Sr isotopic eochemistry of the Dexinggranodiorite porphyries[J]. Acta Petrologica Sinica, 2004, 20(2): 315-324.
Citation: WANG Qiang,ZHAO ZhenHua,JIAN Ping,XU JiFeng,BAO ZhiWei and MA JinLong Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China. SHRIMP zircon geochronology and Nd-Sr isotopic eochemistry of the Dexinggranodiorite porphyries[J]. Acta Petrologica Sinica, 2004, 20(2): 315-324.
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德兴花岗闪长斑岩SHRIMP锆石U-Pb年代学和Nd-Sr同位素地球化学

    • 中国科学院广州地球化学研究所，中国科学院广州地球化学研究所，中国地质科学院地质研究所，中国科学院广州地球化学研究所，中国科学院广州地球化学研究所，中国科学院广州地球化学研究所 广州 510640，广州 510640，北京 100037，广州 510640，广州 510640，广州 510640

  • 基金项目:

    国家自然科学基金项目(40273019、40172028)，中国科学院知识创新项目(KZCX3-SW-122,KZCX2-SW-117,KZCX2-102)，国家重点基础研究发展规划项目(G1999043202)的资助。

SHRIMP zircon geochronology and Nd-Sr isotopic eochemistry of the Dexinggranodiorite porphyries

    摘要
  • 德兴斑岩铜矿区的成矿斑岩的形成时代一直存在争议。本文对铜厂、富家钨花岗闪长斑岩进行了SHRIMP锆石U-Pb年代学研究。研究结果显示:(1)铜厂花岗闪长斑岩样品中锆石15个分析点的206Pb/238U年龄为165～177Ma.206Pb/238U年龄的加权平均值为171±3 Ma;(2)富家钨花岗闪长斑岩样品中锆石15个分析点的206Pb/238U年龄为166-177Ma,206Pb/238U年龄的加权平均值也为171±3 Ma。因此,德兴花岗闪长斑岩形成于中侏罗世(171±3 Ma)。该年龄与德兴斑岩铜矿区辉钼矿的Re-Os同位素年龄(173 Ma)在误差范围内一致,暗示了成岩成矿的一致性。德兴花岗闪长斑岩的形成时代与华南地区许多A型花岗岩,双峰式或板内火成岩和矿床的形成时代也大致一致,同时也与赣-杭裂谷带的活动时间一致,表 明德兴斑岩铜矿和花岗闪长斑岩形成于一个伸展的动力学背景下。另外,德兴花岗闪长斑岩很少有老的继承锆石以及其高的εNd(t)(-1.14- 1.80)和极低的初始87St/86Sr比值(0.7044-0.7047),暗示古老的地壳物质对其贡献并不明显,地幔物质可能在德兴花岗闪长斑岩的成因中发挥了重要作用。再结合其具有的埃达克质岩的元素地球化学特征。本文认为德兴花岗闪长斑岩很可能由拆沉下地壳物质的熔融形成。
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