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J4 ›› 2010, Vol. 16 ›› Issue (2): 218-225.

• 矿床岩石地球化学及年代学专栏 • 上一篇    下一篇

赣东北鹅湖岩体SHRIMP 锆石U-Pb 年龄、Sr-Nd-Hf 同位素地球化学与岩石成因

赵 鹏, 姜耀辉, 廖世勇, 周 清, 靳国栋   

  1. 南京大学 地球科学与工程学院;内生金属矿床成矿机制研究国家重点实验室 (南京大学),南京 210093
  • 收稿日期:2010-04-21 修回日期:2010-05-13 出版日期:2010-06-20 发布日期:2010-06-20
  • 作者简介:赵鹏,1984年生,硕士研究生,矿物学、岩石学、矿床学专业,E-mial:pengzhao925@126.com
  • 基金资助:

    国家自然科学基金重点项目(40730313)

SHRIMP Zircon U-Pb Age, Sr-Nd-Hf Isotopic Geochemistry and Petrogenesisof the Ehu Pluton in Northeastern Jiangxi Province

ZHAO  Peng, JIANG Yao-hui, LIAO Shi-yong, ZHOU Qing, JIN Guo-dong   

  1. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China
  • Received:2010-04-21 Revised:2010-05-13 Online:2010-06-20 Published:2010-06-20

摘要:

对赣东北鹅湖岩体进行了SHRIMP 锆石U-Pb 年代学、元素和Sr-Nd-Hf 同位素地球化学及岩石成因研究。SHRIMP 锆石U-Pb 定年结果表明,鹅湖岩体形成于早白垩世的(121.7±2.9) Ma;岩相学及元素和Sr-Nd-Hf 同位素特征表明鹅湖花岗岩属于S 型,主要是由地壳深处(至少40 km)的古元古代变质沉积岩发生部分熔融形成的,成岩过程中并没有发生强烈的分离结晶作用和幔源岩浆混合作用,赣东北地区早白垩世伸展构造背景造成的软流圈地幔上涌可能是下地壳岩石发生部分熔融的诱因。

关键词: 鹅湖花岗岩, 赣东北, SHRIMP锆石U-Pb年龄, Sr-Nd-Hf同位素

Abstract:

In this study, we present detailed SHRIMP zircon U-Pb chronology, major and trace elements, and Sr-Nd-Hf isotope data for the Ehu pluton in northeastern Jiangxi province, in an attempt to better constrain its petrogenesis. SHRIMP zircon U-Pb dating shows that the Ehu pluton was emplaced in the Early Cretaceous (121.7 Ma±2.9 Ma). Petrographic, elemental and Sr-Nd-Hf isotopic characteristics suggest that the Ehu granites are of S-type, generated by partial melting of Paleoproterozoic metasedimentary basement in the deep (>40 km) crust, with no fractional crystallization and mantle-derived magma mixing in their evolution. The upwelling of asthenosphere during the Early Cretaceous extensional tectonic regime in the region induced partial melting of the lower crust.

Key words: Ehu granite, northeastern Jiangxi province, SHRIMP zircon U-Pb age, Sr-Nd-Hf isotope

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