Geochemistry and tectonic setting of the Jiarongjiandegongka intrusive rocks in Qumarleb, Qinghai

The intrusive sequences in Jiarongjiandegongka, Qinghai consist of quartz diorite, tonalite, granodiorite and syenogranite. The lithochemical compositions display the evolution from intermediate, basic to acidic rocks, and the magmas are rich in silica and alkali. The geochemical signatures are characterized by the enrichment of LREE, enrichment of large ion lithophile elements such as Rb, K, Ba and Th, slight depletion of Sr, Nb and Ta, and strongly depletion of Ti and P. The tectonic setting of the Jiarongjiandegongka intrusive rocks are assigned to syn-collision granites, and may be traced back to the Early Cretaceous.