Provenance of Triassic Xiazijie Fan-Delta in Junggar Basin, Northwestern China: Insights from U-Pb Dating of Detrital Zircons

Abundant hydrocarbon resources were discovered in the Xiazijie fan-delta Triassic Baikouquan Formation Mahu sag, Junggar Basin. However, maximum depositional age of and provenance this are still unclear, which would be unfavourable for further exploration. In study, we used detrital zircon U-Pb dating composition statistics conglomerate clast sandstone grain from to constrain fan-delta. The results showed that (1) compositions mainly consisted tuff intermediate-felsic magmatic rocks, samples could classified as litharenite type with lithic fragments almost entirely volcanic fragments; (2) average Qt:F:L values (M152-S1 M152-S2) 26:7:67 21:8:71, respectively, they plotted arc domain Qt-F-L ternary diagram, indicating tectonic setting source area was arc; (3) M152-S1 yielded ages ranging 417 Ma 253 Ma, a dominant peak at 313 two secondary peaks 411 268 while M152-S2 467 256 307 date 405 262 Ma; (4) mean youngest grains 254.8 ± 4.7 257.6 3.8 suggesting might deposited after Changhsingian Olenekian; (5) rock central West distributed mostly between 450–260 Ma. distribution WJ zircons similar, should major fan-delta; (6) Hakedun–Hongguleleng Central characterized by 305 consistent M152-S2, Hakedun-Hongguleleng likely their area; (7) one minor another obtained Middle Ordovician Late Silurian–Early Devonian Chagankule pluton Saier Mountain Honggleleng ophiolite mélange Sharburt mountain areas. This research has significant implications stratigraphic correlation Basin exploration reservoir.