This paper presents petrological, geochemical, zircon U- Pb, and Hf isotope analyses of widely exposed granitoids from the Yuka ultra- high pressure metamorphic terrane in the northern Qaidam basin. LA- ICP- MS zircon U- Pb dating yields metamorphic ages of 929±6 Ma, magmatic crystallization ages ranging from 915±6 Ma to 904±5 Ma, and melting/fluid events between 420±3 Ma and 402±4 Ma. The Yukahe and Kaipinggou gneissic monzogranites belong to the high- K calc- alkaline series, with K2O/Na2O ratios of 1. 53~2. 60. Their low zircon εHf(t) values (12. 86 to 0. 76) suggest a metasedimentary or greywacke source. In contrast, the Caishigou and West Asbestos Mine granitic gneisses are medium- K calc- alkaline, with K2O/Na2O＜1. They exhibit weak Eu anomalies and Sr positive anomalies, indicative of an amphibolite or quartz diorite source. The West Asbestos Mine granitic gneiss has εHf(t) value ranging from 5. 21 to +15. 52, reflecting source heterogeneity involving basic crustal material mixed with ancient crustal components. Geochemical signatures suggest magma generation primarily through dehydrated melting of muscovite and hornblende, potentially with some contribution from water- present melting. Collectively, we interpret the ca. 915~904 Ma granitoids as having formed in a post- collisional tectonic setting. The ca. 420~400 Ma features recorded in the granitic gneisses probably represent metamorphic melt/fluid events related to the exhumation of deeply subducted continental crust, which overprinted the early Neoproterozoic crust. The granitoids from the Yuka ultra- high pressure terrane thus preserve evidence of multiple melting and metamorphic fluid events during Neoproterozoic and Early Paleozoic orogenesis.