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- W2036835705 abstract "Late Paleoproterozoic (1.84‒1.62 Ga) magmatic rocks including dykes/sills/intrusions and volcanic rocks occur throughout the North China Craton (NCC), which is considered to be part of the Columbia supercontinent by ca. 1.9–1.85 Ga. On the basis of petrogeochemical data, these magmatic rocks can be classified into three major magma types: HN (Nb/La > 0.8, Ce/Nb = 1.7‒3, (Th/Nb)N = 0.6‒1.2), MN (Nb/La = 0.8–0.5, Ce/Nb = 3‒5, (Th/Nb)N = 0.9‒3.5) and LN (Nb/La < 0.5, Ce/Nb = 5‒80, (Th/Nb)N = 1‒60). The geochemical variation of the MN and LN rocks can be explained by lithospheric contamination of asthenosphere- (or plume-) derived magmas, whereas the parental magmas of the HN rocks did not undergo, during their ascent, pronounced lithospheric contamination. These magmatic rocks exhibit at least two characteristics: (1) most displaying a spectrum of compositions from mafic to silicic; (2) forming in an intracontinental rift setting. This Late Paleoproterozoic rift-related magmatism is the most distinguishing feature of the rifting of the Columbia supercontinent." @default.
- W2036835705 created "2016-06-24" @default.
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- W2036835705 creator A5045767657 @default.
- W2036835705 creator A5057609149 @default.
- W2036835705 creator A5068795660 @default.
- W2036835705 date "2013-10-01" @default.
- W2036835705 modified "2023-09-27" @default.
- W2036835705 title "Late Paleoproterozoic rift-related magmatic rocks in the North China Craton: Geological records of rifting in the Columbia supercontinent" @default.
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