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- W2365851663 abstract "The late Triassic potash-rich volcanic rocks in the southern Lancangjiang belt are characterized by low-Si(SiO2 50.47%-52.99%),high-alkali(K2O+Na2O 5.66%-9.39%) and high-K(K2O 2.8% on average),and belong to potassium-high calc-alkali basalt-shoshonite series.The rocks are also enriched in large ion lithophile element(LILE),light rare earth elements(LREE),and depleted in high field strength elements(HFES),non or slightly negative Eu anomaly(δ(Eu)=0.85-1.09) in the abundance.The results show that the rocks have relatively low 143Nd/144Nd ratios(0.512 511-0.512 569) and relatively high initial 87Sr/86Sr ratios(0.707 01-0.710 56),as well as negative e(Nd) values of -2.48--1.27(-1.94 on average).Their characteristics of trace elements and Sr-Nd isotopic composition are consistent with EMⅡ,indicating that the source consists of crust-mantle mixed material,which is inevitably related to the subduction eastward of Tethyan Lancangjiang oceanic plate.Based on the geochemistry,it is suggested that the primary magma was likely generated from partial melting of spinel harzburgitic source metasomatized by Paleo-Tethyan subduction-related fluids." @default.
- W2365851663 created "2016-06-24" @default.
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- W2365851663 date "2012-01-01" @default.
- W2365851663 modified "2023-09-25" @default.
- W2365851663 title "Geochemistry characteristics of late Triassic potash-rich volcanic rocks and their origins in southern Lancangjiang belt,western Yunnan Province, China" @default.
- W2365851663 hasPublicationYear "2012" @default.
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