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- W2364241911 abstract "Foliated garnet bearing granites, distributed in the high pressure (HP) unit and ultrahigh pressure (UHP) unit, are one of the major surrounding rocks of the eclogites in the Tongbai Dabie orogenic belt. The geochemicalcharacteristics of the foliated garnet bearing granites in the HP unit are reported in this paper. They have SiO2 71.96%～77.99%, K2O+Na2O 7.59%～8.66%, Al2O3 11.15%～14.50%, CaO 0.10%～0.91%, MgO 0.04%～0.73%,Sr 27.3～269 μg/g and A/CNK 0.97～1.10. They have the geochemical characteristics of A type granites relative to I and S type granites. They are rich in Si, alkali and HFSE (such as Zr, Hf, Nb, Ta, Y) and depleted in Ca, Mg, Aland Sr. They have high Ga/Al ratios. The REE patterns of most samples show obvious negative Eu anomaly with Eu/Eu 0.06～0.60, (La/Yb)N 2.34～7.87. In the discrimi nation diagrams for the petrogenesis interpretation they belong to A type granites. The studies of tectonic interpretation, tectonics and petrology show that they formed in the post COLG environment. The geochemical characteristics as a whole show that they are A type granites and the magma of foliated garnet bearing granites formed in the extensional tectonic setting postdating the HP and UHP metamorphism. The formation of foliated garnet bearing granites is related to the process of the UHP and HP metamorphic rocks exhumation frommantle to middle lower crust." @default.
- W2364241911 created "2016-06-24" @default.
- W2364241911 creator A5030053034 @default.
- W2364241911 date "2004-01-01" @default.
- W2364241911 modified "2023-09-25" @default.
- W2364241911 title "Geochemistry and petrogenesis of foliated garnet bearing granites in the high pressure metamorphic unit of the Tongbai Dabie orogenic belt" @default.
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