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The granodiorite-tonalite rock occurred in ophiolitic melange was discovered in Buqingshan area, Qinghai Province. Its Rb-Sr isochron age is 578.15±54.4 Ma which belongs to Early Paleozoic. The rock, belonging to calcic-alkaline series, has the features of island-arc granite, which hints-that oceanic crust subduction and island-arc magmatism occurred in this area in Early Paleozoic. This discovery is of great significance to recognize the tectonic framework and evolution of this area even as far as the Central Orogenic Belt.
The granodiorite-tonalite rock occurred in ophiolitic melange was discovered in Buqingshan area, Qinghai Province. Its Rb-Sr isochron age is 578.15 ± 54.4 Ma which belongs to Early Paleozoic. The rock, belonging to calcic-alkaline series, has the features of island -arc granite, which hints-that oceanic crust subduction and island-arc magmatism occurred in this area in Early Paleozoic. This discovery is of great significance to recognize the tectonic framework and evolution of this area even as far as the Central Orogenic Belt.