粤西福湖岭混合岩及其原岩的地质年代学研究
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国家自然科学基金重点项目(41430208)


Geochronology of Fuhuling migmatite and its protolith in western Guangdong
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    摘要:

    为了深入认识华夏地块早古生代陆内造山作用相应的地壳再造过程,本文选取粤西福湖岭混合岩进行了详细的岩相学以及锆石U-Pb年代学研究。根据混合岩化程度,粤西福湖岭混合岩剖面由上而下可以分为3部分:混合岩化沉积变质岩、条带状混合岩和混合花岗岩。根据岩性与岩相学特征,福湖岭混合岩又可分为古成体、暗色体和浅色体。LA-ICP-MS 锆石U-Pb定年结果及与区域上基底变质岩资料的对比研究表明,福湖岭混合岩的原岩(古成体)是形成于新元古代的变质沉积岩。粤西福湖岭混合岩的形成时代为441~435 Ma,是华夏地块早古生代陆内造山事件的重要产物。

    Abstract:

    In order to further understand the crust reworking process related to the early Paleozoic intracontinental orogeny in the Cathaysia Block, this paper presents detailed studies of lithology, petrography and zircon U-Pb dating of the Fuhuling migmatites in western Guangdong Province. With the increasing migmatization, these rocks can be divided into three rock types: migmatized para-metamorphic rock, stromatic migmatite and migmatitic granite (diatexite). According to lithological and petrographic characteristics, the Fuhuling migmatites can be divided into three suites: paleosomes, melanosomes, and leucosomes. LA-ICP-MS zircon U-Pb dating results together with a comparison with the data of metamorphic basements from this region suggest that the protolith (paleosome) was meta-sedimentary rocks deposited in the Neoproterozoic, and the migmatization occurred at 441~435 Ma, related to the early Paleozoic intracontinental orogeny in South China.

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周登赟,徐夕生, 2017. 粤西福湖岭混合岩及其原岩的地质年代学研究[J]. 岩石矿物学杂志, 36(4):473~487.
ZHOU Deng-yun, XU Xi-sheng, 2017. Geochronology of Fuhuling migmatite and its protolith in western Guangdong[J]. Acta Petrologica et Mineralogica, 36(4): 473~487.

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  • 收稿日期:2017-03-01
  • 最后修改日期:2017-06-04
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  • 在线发布日期: 2017-07-27
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