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
Zircon ages and Hf isotopic composition of gneisses from the Rongcheng ultrahigh-pressure terrain in the Sulu orogenic belt
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摘要: 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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Key words:
- Sulu orogen /
- Gneiss /
- Neoproterozoic /
- Zircon age /
- Nd-Hf isotope /
- Rongcheng
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