| 皖南蛇绿岩套辉长岩锆石U-Pb定年以及元素和氧同位素研究 |
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| 关键词:gabbro zircon O isotope Neoproterozoic hydrothermal alteration |
| 基金项目:本文为国家自然科学基金项目（编号：40334036)和中国科学院知识创新工程项目（编号:KZCX3-SW-141)资助成果。 |
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| Zircon U-Pb Dating and Element and Oxygen Isotope Geochemistry of Gabbro from Ophiolites in South Anhui |
| Zircon U-Pb dating, whole-rock major and trace elements, Sr-Nd isotopes, and mineral O isotopes were determined for samples from ophiolites in south Anhui. LA-ICPMS and SHRIMP zircon U-Pb analysis reveals three age phases of magmatic zircons formed at 891±13 Ma, 826±4 Ma and 764±10 Ma respectively. The features of elements and isotopes display apparent signatures of island-arc magmatic rocks, suggesting that they were derived from partial melting of mantle lithosphere of the supra-subduction zone (SSZ)．O isotope analyses suggest that they experienced different degrees of subsolidus hydrothermal alt eration. Based on element and isotope analyses in combination with the records of Neoproterozoic magmatism in this area, the authors interpret 891±13 Ma and the age of ophiolite emplacement. It is also thought that at 826±4 Ma the rocks were rebuilt by pre-rift magmatic activities, and at 764±10 Ma they were affected by syn-rift magmatism and subsolidus hydrothermal alteration. |
| WU Rongxin,ZHENG Yongfei,WU Yuanbao.2005.Zircon U-Pb Dating and Element and Oxygen Isotope Geochemistry of Gabbro from Ophiolites in South Anhui[J].Acta Geoscientica Sinica,26(z1):70-73. |
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