华北陆块东北缘张三沟岩组SHRIMP锆石U-Pb年代学研究及其地质意义
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国家自然科学基金项目(面上项目,重点项目,重大项目),中国科学院知识创新项目


Zircon SHRIMP Geochronology of the Zhangsangou Formation-Complex in the Northeastern Margin of North China Block, and its Geological Significance
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    摘要:

    出露于华北陆块东北缘的张三沟岩组为一套变质火山-沉积岩系,前人根据变质程度和地层对比将其划归古元古代。本文通过SHRIMP锆石U-Pb年代学研究,获得2517±9 Ma 、2518±7 Ma 和2534±26Ma原岩年龄,2439±24Ma、2464±73Ma和2433±71Ma变质年龄。这表明该套变质岩层形成于新太古代晚期,变质时代在新太古代末-古元古代初。结合区域资料,其变质年龄可能代表了古龙岗陆块与位于其北东侧的其它陆块(如佳木斯陆块)碰撞造山的时代,表明华北克拉通在新太古代末-古元古代初期经历过一次重要的克拉通化。

    Abstract:

    Zhangsangou Formation-Complex is located in the northeastern margin of North China Block, which has been previously considered to be Paleoproterozoic metamorphic volcanic-sedimentary sequences, mainly according to its metamorphic grade and regional stratigraphic correlation. Based on our filed investigation and SHRIMP dating, three samples from Zhangsangou Formation-Complex have yielded protolith age of 2517±9 Ma, 2518±7 Ma, 2534±26Ma and metamorphic age of 2439±24Ma、2464±73M and 2433±71Ma, respectively, indicating that it formed in late Neoarchean and reworked in late Neoarchean-early Paleoproterozoic by metamorphinism. In combination with regional geological data, we show that its metamorphic time is likely related to a collisional tectonism between ancient Longgang’s continental bolck and other continental bolck,which indicates that North China Block developed a cratonization in late Neoarchean-early Paleoproterozoic.

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李承东,张福勤,苗来成,杜玉林,花艳秋,许雅雯,康淑梅.2009.华北陆块东北缘张三沟岩组SHRIMP锆石U-Pb年代学研究及其地质意义[J].地质学报,83(5):642-650.
LI Chengdong, ZHANG Fuqin, MIAO Laicheng, DU Yulin, HUA Yanqiu, XU Yawen, Kang Shumei.2009. Zircon SHRIMP Geochronology of the Zhangsangou Formation-Complex in the Northeastern Margin of North China Block, and its Geological Significance[J]. Acta Geologica Sinica,83(5):642-650.

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  • 收稿日期:2008-12-23
  • 最后修改日期:2008-12-23
  • 录用日期:2009-03-30
  • 在线发布日期: 2009-05-11
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