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The Longshan–Tianshui area is located in the southeast corner of the Qilian orogenic belt. Three intrusions (the Yanjiadian diorite, the Caochuanpu and the Guanshan granites) in this area provide insights into regional tectono-magmatic events, petrogenesis and tectonic evolution. Based on U–Pb zircon SHRIMP dating, the magma emplacement ages of the Yanjiadian diorite, the Caochuanpu and the Guanshan...