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- W2364499390 abstract "Granitoids occurred in Demingding region,east of middle Gangdise volcanic magma arc in Tibet,was composed of quartz diorite,quartz monzodiorite,leucotonalite,biotite granodiorite and porphyrite biotite adamellite with alkaline calcium-calcium characteristics.SiO2 content of the rocks ranged from 57.19% to 71.78%,the ratio of K2O/Na2O equals 0.39～0.98,with relatively rich sodium,and A/CNK was equals to 0.80 ～1.02.The content of Al2O3 of 13.64%～18.74% indicated that the rocks were of the aluminium type.Granite aggregate ΣREE for rare earth elements ranges from 95.11×10-6 to 187.21×10-6 with enrichment of light REE.Negative Eu anomaly changed from no obviousness to obviousness.The rocks were rich in K,Rb,Ba,Th and other large-ion stone elements and poor in high field strength elements of Nb,Y,Yb.Study of petrology and geochemistry showed that the granite subjected a magma evolution from acid to neutral and was of characters of I type granite.They formed in the island arc environment during the plate subduction.SHRIMP U-Pb age of the granodiorite in the eastern section of Gangdise was 70.4 Ma±2.2 Ma,implying that the magmatism in Gangdise acted throughout Cretaceous and the magmatic activity was the product of northward subduction of new Tethys." @default.
- W2364499390 created "2016-06-24" @default.
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- W2364499390 date "2010-01-01" @default.
- W2364499390 modified "2023-09-25" @default.
- W2364499390 title "SUBDUCTION-RELATED LATE CRETACEOUS GRANITOIDS IN DEMINGDING,AREA,EAST OF MIDDLE GANGDISE,TIBET:EVIDENCES FROM ZIRCON U-Pb GEOCHRONOLOGY AND GEOCHEMISTRY" @default.
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