苏鲁造山带荣成超高压地体片麻岩锆石年龄和铪同位素组成特征

李向辉 陈福坤 李潮峰 张华锋 郭敬辉 杨岳衡. 苏鲁造山带荣成超高压地体片麻岩锆石年龄和铪同位素组成特征[J]. 岩石学报, 2007, 23(2): 351-368.
引用本文: 李向辉 陈福坤 李潮峰 张华锋 郭敬辉 杨岳衡. 苏鲁造山带荣成超高压地体片麻岩锆石年龄和铪同位素组成特征[J]. 岩石学报, 2007, 23(2): 351-368.
LI XiangHui, CHEN FuKun, LI ChaoFeng, ZHANG HuaFengc, GUO JingHui, YANG YueHeng. Zircon ages and Hf isotopic composition of gneisses from the Rongcheng ultrahigh-pressure terrain in the Sulu orogenic belt[J]. Acta Petrologica Sinica, 2007, 23(2): 351-368.
Citation: LI XiangHui, CHEN FuKun, LI ChaoFeng, ZHANG HuaFengc, GUO JingHui, YANG YueHeng. Zircon ages and Hf isotopic composition of gneisses from the Rongcheng ultrahigh-pressure terrain in the Sulu orogenic belt[J]. Acta Petrologica Sinica, 2007, 23(2): 351-368.

苏鲁造山带荣成超高压地体片麻岩锆石年龄和铪同位素组成特征

  • 基金项目:

    国家自然科学基金委员会(批准号:40525007,40421202)致谢 研究工作由国家自然科学基金委员会资助(项目批准号:40525007和40421202).感谢范宏瑞研究员和一位匿名评审人提供的宝贵意见和建议以及万渝生研究员在SHRIMP分析的帮助.

Zircon ages and Hf isotopic composition of gneisses from the Rongcheng ultrahigh-pressure terrain in the Sulu orogenic belt

  • 本文对苏鲁造山带内荣成超高压地体片麻岩样品进行了锆石U-Pb年龄、Hf同位素和全岩Nd同位素分析,旨于探讨片麻岩的原岩性质及成因.3个片麻岩样品的锆石SHRIMP U-Pb年龄(770 Ma和710 Ma之间)表明原岩形成于晚元古代,与Rodinia超大陆裂解过程的岩浆活动时间相吻合.14个片麻岩的单阶段钕模式年龄变化在1.70 Ga至2.30 Ga(平均~1.93 Ga),表明荣成超高压地体片麻岩平均地壳存留时间为古元古代,与扬子陆块的平均地壳形成年龄相一致,暗示具有扬子陆块属性.其锆石εHf(t)值(t=750 Ma)和模式年龄值变化范围大.2个片麻岩的锆石具有非常负的εHf(t),平均值为-16.4,铪模式年龄为2.70 Ga.6个片麻岩的锆石εHf(t)平均值为-7.7,铪模式年龄为2.15 Ga.这些结果表明荣成超高压地体部分原岩主要由太古代-古元古代地壳物质在晚元古代时重熔形成的,进一步说明荣成地区可能有扬子陆块的太古代地壳残留.另有6个片麻岩的锆石εHf(t)变化范围为-0.56至6,6之间,其中部分锆石的两阶段Hf模式年龄为0.81 Ga至0.94 Ga,表明片麻岩原岩晚元古代形成时,有幔源岩浆活动和新生地壳形成,可能同时存在强烈壳-幔相互作用,上侵的幔源岩浆底侵导致上覆扬子陆块太古代-古元古代地壳物质重熔,形成花岗质岩浆.
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修回日期:  2006-09-29
刊出日期:  2007-02-28

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