Mesozoic, Not Paleoproterozoic SHRIMP U-Pb Zircon Ages of Two Liaoji Granites, Eastern Block, North China Craton
作者： Sanzhong Li , Guochun Zhao , Min Sun , Wu Fuyuan , Jianzhong Liu
DOI: 10.2747/0020-6814.46.2.162
关键词:
摘要: The Paleoproterozoic Jiao-Liao-Ji orogen in the North China craton is composed mainly of Liaohe Group (and its equivalents) and Liaoji Granites. latter have long been considered to be age, but not precisely constrained by reliable isotopic ages. CL BSE images reveal existence both magmatic xenocrystal/inherited zircons one rock sample each from Dandong Gaoliduntai granites, two major Granite intrusions. occur as either single grains or rims surrounding truncating zircon cores, are characterized euhedral, prismatic with well-developed oscillatory zoning, whereas cores surrounded igneous rims, exhibiting weakly zoned bands. yielded ages 157.4 ± 5.7 Ma 156.3 4.8 for respectively, indicating that these plutons were empla...
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