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- W2389341769 abstract "The granite porphyry in southern section of Liupanshan and eastern section of Longxian Guguan Zhen was considered asMesozoic-Cenozoic high-K calc-alkaline granites that record Paleoproterozoic magma activities. The granite porphyry contains high levelof SiO2(71.14%~73.33%), alkaline-rich(Na2O+K2O=7.61~8.70), K-high(K2O/Na2O=1.21~2.52,with an average of 2.03), fallinginto the range of metaluminous to weakly peraluminous(A/CNK=0.93~1.09,with an average of 1.0). The intense enrichment in LREEasymmetrical right-inclined rare earth element pattern, and the obvious negative Eu anomaly(δEu=0.44~0.47) suggest that the rocksare enriched in LILE(K, Rb, Ba, Th) and depleted in the high field strength elements(Ti, Nb, Ta). They are characterized by crustalderived A-type granites in geochemistry. Zircon U-Pb LA-ICP-MS dating of the magmatic genetic zircon yields an age of 1846±32 Ma,which should represent the emplacement age of the granite porphyry, suggesting that the granite porphyry was formed inPaleoproterozoic, not Mesozoic-Cenozoic as previously thought. The calcirudites of Beiguoshan Formation in Upper Ordovician wereactually deposited on the granite porphyry of Paleoproterozoic. This study shows that the southwestern margin of North China Craton inPaleoproterozoic was in an extensional tectonic environment. It may provide direct petrological evidence for Paleoproterozoic aulacogenof Helan mountain that extends southward to the southern section of Liupanshan." @default.
- W2389341769 created "2016-06-24" @default.
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- W2389341769 date "2014-01-01" @default.
- W2389341769 modified "2023-09-23" @default.
- W2389341769 title "Paleoproterozoic Granite Porphyry in Southwestern Margin of North China Craton and its Geological Significance" @default.
- W2389341769 hasPublicationYear "2014" @default.
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