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Electron microprobe monazite Th-Pb dating and its constraints on multi-stage metamorphism of low-pressure pelitic granulite from the Jingshan Group in the Jiaobei terrane

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Chinese Science Bulletin

Abstract

Monazites from low-pressure pelitic granulite of the Jingshan Group in the Jiaobei terrane were dated by the electron microprobe method. Three stages of metamorphic age at 1720±15 Ma, 1687±16 Ma and 1568±15 Ma were yielded by constructing age mapping for zoned monazites and PbO-ThO2* isochron diagram for unzoned monazites, respectively. The first age was interpreted as the age of an early amphibolite-facies metamorphism, the second age as the peak granulite-facies, and the last age as uplifting of the granulite unit. These ages are the first geochronologic data for the low-pressure pelitic granulites in the Jingshan Group, and thus are of important significance when discussing the tectono-metamorphic evolution of the Jiaobei terrane.

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Authors and Affiliations

  1. Institute of Geology, Chinese Academy of Geological Sciences, 100037, Beijing, China

    Zhou Xiwen & Geng Yuansheng

  2. The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, 100871, Beijing, China

    Zhou Xiwen, Wei Chunjing & Zhang Lifei

Authors
  1. Zhou Xiwen
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  2. Wei Chunjing
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  3. Geng Yuansheng
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  4. Zhang Lifei
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Correspondence to Zhou Xiwen.

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Xiwen, Z., Chunjing, W., Yuansheng, G. et al. Electron microprobe monazite Th-Pb dating and its constraints on multi-stage metamorphism of low-pressure pelitic granulite from the Jingshan Group in the Jiaobei terrane. Chin.Sci.Bull. 50, 1009–1015 (2005). https://doi.org/10.1360/982004-135

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  • DOI: https://doi.org/10.1360/982004-135

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