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Exact timing of granulite metamorphism in the Namche-Barwa, eastern Himalayan syntaxis: new constrains from SIMS U-Pb zircon age
作者: W. Su, M. Zhang, X. H. Liu, J. F. Lin, K. Ye and X. Liu
期刊名称: International Journal of Earth Sciences
发表年度: 2012
卷: 101
期: 1
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页码: 239-252
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全文链接: http://dx.doi.org/10.1016/j.epsl.2011.02.055
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摘要: Zircon grains separated from 2 granulites from the eastern Himalaya were investigated by Raman spectroscopy, cathodoluminescence imaging, and secondary ion mass spectrometry. These grains have a thin homogeneous rim and an oscillatory inner zone domain with or without a relict inherited core. Garnet, kyanite, and rutile inclusions were identified within only the rim domain of zircon grains, indicating that the rim had formed during peak granulite-facies metamorphism. U-Pb zircon data record three distinct age populations: 1,805 Ma (for the inherited core), ca. 500 Ma (oscillatory inner zone), as well as 24-25 Ma and ca. 18 Ma (for the metamorphic rim). These new precision ages suggest that the peak metamorphic age for the HP granulite is at ca. 24-25 Ma, and subsequent amphibolite-facies retrograde metamorphism occurred at ca. 18 Ma.
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