北京密云环斑花岗岩锆石U-Pb年龄和Hf同位素及其地质意义

杨进辉 吴福元 柳小明 谢烈文. 北京密云环斑花岗岩锆石U-Pb年龄和Hf同位素及其地质意义[J]. 岩石学报, 2005, 21(6): 1633-1644.
引用本文: 杨进辉 吴福元 柳小明 谢烈文. 北京密云环斑花岗岩锆石U-Pb年龄和Hf同位素及其地质意义[J]. 岩石学报, 2005, 21(6): 1633-1644.
YANG JinHui WL FuYuan LIU XiaoMing XIE LieWen 1.State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Acudemy of Sciences.Beijing 100029,China2.Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi''an 710069,China. Zircon U-Pb ages and Hf isotopes and their geological significance of the Miyun rapakivi granites from Beijing, China[J]. Acta Petrologica Sinica, 2005, 21(6): 1633-1644.
Citation: YANG JinHui WL FuYuan LIU XiaoMing XIE LieWen 1.State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Acudemy of Sciences.Beijing 100029,China2.Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi''an 710069,China. Zircon U-Pb ages and Hf isotopes and their geological significance of the Miyun rapakivi granites from Beijing, China[J]. Acta Petrologica Sinica, 2005, 21(6): 1633-1644.

北京密云环斑花岗岩锆石U-Pb年龄和Hf同位素及其地质意义

  • 基金项目:

    本文由国家自然科学基金(40203005,40325006)、中国科学院“百人计划”和大陆动力学重点实验室资助.致谢 感谢西北大学地质系教育部大陆动力学重点实验室袁洪林、第五春容等人在锆石LA-ICPMS分析过程中给予的帮助和指导;感谢马玉光、毛骞在完成锆石CL图像过程中给予的帮助.杨岳衡、张吉衡、程瑞玉参加了部分U-Pb和Hf同位素分析测试,在此表示感谢.

  • 密云岩体位于华北克拉通东部,由环斑花岗岩和斑状黑云母花岗岩组成,是典型 A 型环斑花岗岩岩体之一。锆石的 LA-ICPMS U-Pb 年代学研究表明,密云环斑花岗岩形成于1681±10Ma 和1679±10Ma,而围岩片麻岩的原岩形成于2521±14Ma。锆石的 LA-MC-ICPMS Hf 同位素研究表明,太古代片麻岩来源于亏损地幔物质的部分熔融,从而表明2.5 Ca 是华北克拉通地壳重要的生长期;环斑花岗岩中锆石 Hf 同位素组成为δ_(Hf)(t)=~-5,两阶段模式年龄为 T_(DM2)=2.6~2.8Ga,表明它们来源于太古代新生地壳的部分熔融,密云环斑花岗岩侵位于华北克拉通大陆裂解、伸展环境,可能与全球古元古代未期Columbia 超大陆的裂解有关。
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收稿日期:  2005-05-11
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