Isotopic Ages of the Penglai Group in the Jiaobei Belt and Their Geotectonic Implications |
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作者姓名: | W.R.Fitches C.J.N.Fletcher |
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作者单位: | Institute of Earth Studies,University College of Wales,Aberystwyth,SY23 3D B U K,British Geological Survey,Aberystwyth,SY 23 4BY,U K |
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基金项目: | This study was supported by the National Natural Science Foundation of China,the British Overseas Development Administration and the Royal Society, U. K |
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摘 要: | The Penglai Group in the Jiaobei Belt is the only remaining cover of the Archaean to Early Proterozoic crystalline basement in eastern Shandong. The ages of deposition of the Penglai Group and of its deformation and metamorphism have long been a subject of speculation. Whole-rock Rb-Sr ages, illite-whole-rock pair Rb-Sr ages and illite K-Ar ages recently obtained from the Penglai Group slates are reported and interpreted in this paper. On the basis of structural and metamorphic studies coupled with analyses of illite crystallinity, XRD and SEM , a whole-rock age of 473±32 Ma (Ordovician) is interpreted as the time of termination of burial metamorphism experienced by the Penglai Group. Therefore, the age of the Penghai Group is older than Ordovician. The first-phase folding and syntectonic low greenschist facies metamorphism in the Penglai Group, i.e. the Penglai Movement, took place before 299±4 Ma B.P., i.e in the Late Carboniferous. The Penglai Movement that occurred in the Jiaobei Belt on the south
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Isotopic Ages of the Penglai Group in the Jiaobei Belt and Their Geotectonic Implications |
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Authors: | Zhu Guang Xu Jiawei |
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Institution: | Zhu Guang,Xu Jiawei,Department of Geology,Hefei University of Technology,Hefei,P.R. ChinaW.R. Fitches,Institute of Earth Studies,U niversity College ofW ales,Aberystwyth,SY D B U Kand C. J. N. Fletcher British Geological Survey,Aberystwyth,SY BY,UK |
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Abstract: | |
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Keywords: | illite age Jiaobei Belt North China Plate Yangtze Plate plate collision |
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