To constrain the Late Paleozoic tectonic evolution of Taiyuan Formation, we conducted detrital zircon U-Pb dating and Hf isotopes analysis. The U-Pb age spectra from ten sandstone samples (taken from both the top and bottom of the formation) display four major age groups of 2.6–2.4 Ga, 2.2–1.8 Ga, 496–421 Ma and 350–270 Ma with highest peaks at ca. 323 Ma and 443 Ma. Moreover, on the basis of the weighted mean age of the five youngest detrital zircons (293.0 ± 4.1 Ma), combined with published results, we propose that the Taiyuan Formation formed during the Early Permian. Comparison of detrital zircon U-Pb age spectra and Hf isotopic compositions with potential source regions indicates that the early Paleozoic zircons were largely derived from the North Qinling orogenic belt, whereas the late Paleozoic zircons originated from the Inner Mongolia uplift. This shift reveals a significant provenance change recorded in the Taiyuan Formation. The uplift of the northern North China Craton (Inner Mongolia uplift) is interpreted as a response to the resubduction of the Paleo-Asian Ocean during the Late Paleozoic. The resulting paleogeographic pattern—higher in the north and lower in the south—redirected sediment supply for the uppermost sandstone and overlying strata of the Taiyuan Formation in the Qinshui Basin from the earlier North Qinling orogenic belt to the Inner Mongolia uplift.
Hou et al. (Sat,) studied this question.