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Continuity of the Western Qinling and Qaidam‐Qilian blocks: Evidence from Precambrian and Permian–Triassic strata around the Gonghe Basin area, NW China

Tectonic affinity between the Qaidam‐Qilian Block and the Western Qinling Block is an outstanding issue that has not been fully understood. Detrital zircon U–Pb dating and Hf isotope data for the Precambrian and Permian–Triassic strata around the Gonghe Basin area in both the Western Qinling and Qaidam‐Qilian blocks were studied. Detrital zircons from Precambrian strata range in age from Archean to Late Neoproterozoic, with age peaks at ~2.7–2.5, ~1.8–1.6, and ~0.95–0.75 Ga. Except for Precambrian age groups, Early Palaeozoic (550–500 Ma and ~450 Ma) and Late Palaeozoic–Triassic (~250 Ma) age peaks were also detected in the Triassic strata. The juvenile accreted crustal materials were detected at 1.85–1.5 Ga and over ~2.5 Ga based on zircon Hf isotope studies. Different Precambrian and Triassic strata in both the Western Qinling Block and the Qaidam‐Qilian Block show parallel age distribution patterns and Hf isotopes. A Qaidam‐Qilian source contributed to the majority of detritus in Precambrian strata. Besides sources from the Qaidam‐Qilian Block, Late Permian intrusions around the Gonghe Basin area also provided inputs for the Triassic strata. Detrital zircon studies show a strong connection of the Qaidam‐Qilian Block and the majority of detritus in the Gonghe Basin area of the Western Qinling Block. Tectonomagmatic and provenances comparison of the Western Qinling and Qaidam‐Qilian blocks are supportive of their tectonic continuity at least in three stages, that is, in the Precambrian, Middle Palaeozoic, and Permian to Early Triassic.