Summay
A suite of potassic alkaline volcanites is spatially and temporally associated with rapakivi granites which are related to Proterozoic (1.85 to 1.40 Ga) rifting in the Beijing area. The volcanites are spread along an EW-trending 150 km long sea basin rift and the rapakivi granites were emplaced along a major EW-fault in nn adjacent uplifted region. The alkaline magmatism is comparable to the middle Proterozoic anorogenic magmatism in North America and Fennoscandia and is related to incipient breakup of the craton they intrude. The volcanic rocks and the rapakivi granites show within plate affinities. They also have similar overall REE distribution patterns that are enriched in LREE. The rapakivi granites show larger negative Eu anomalies than the volcanites. The data suggest that the rapakivi granites were crystallised from a more evolved magma than the volcanic rocks.
Zusammenfassung
Eine Serie von K-reichen, alkalischen Vulkaniten ist räumlich und zeitlich mit Rapakivi-Graniten, die mit dem proterozoischen (1.85 bis 1.40 Mia) Rifting in der Peking Region im Zusammenhang stehen, assoziiert. Die Vulkanite treten entlang eines E-W-streichenden, 150 km langen Riftbeckens auf, die Rapakivi-Granite kommen entlang einer EW Hauptstörung in einer angrenzenden Hebungszone vor. Der Alkali-Magmatismus ist mit dem mittelproterozoischen, anorogenen Magmatismus in Nordamerika und Fennoskandien vergleichbar und mit einem beginnenden Aufbrechen des Kratons ver bunden. Sowohl die Vulkanite, wie auch die Rapakivi-Granite zeigen Intraplatten-Affinität. Sie zeigen generell ähnliche SEE Verteilungsmuster, die an LSEE angereichert sind. Die Rapakivi-Granite zeigen weiters eine stärkere, negative Eu-Anomalie als die Vulkanite. Diese Daten weisen darauf hin, daß die Rapakivi-Granite aus einem höher entwickelten Magma als die Vulkanite entstanden sind.
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Yu, J., Fu, H., Zhang, F. et al. Petrogenesis of potassic alkaline volcanics associated with rapakivi granites in the Proterozoic rift of Beijing, China. Mineralogy and Petrology 50, 83–96 (1994). https://doi.org/10.1007/BF01160141
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DOI: https://doi.org/10.1007/BF01160141