Detrital Zircon U-Pb Ages of the Late Carboniferous-Early Triassic sedimentary strata of Puyang Area
Description
To reveal the stratigraphic age of the Shiqianfeng Formation in the eastern continental basin of the North China Craton and the provenance of its sediments from the Late Carboniferous to the Early Triassic, six sandstone samples from the Puyang area were selected for zircon U-Pb dating. Two sandstone samples from the Shiqianfeng Formation give the youngest peak zircon ages of 243 Ma and 247 Ma respectively, indicating that the Shiqianfeng Formation in the eastern North China Craton belongs to the Early Triassic. The six samples exhibit four age clusters, among which the two Archean-Proterozoic age clusters of 1600-2200 Ma and 2233-3100 Ma correspond to the tectonic-thermal events in the Precambrian North China Craton basement. The Late Paleozoic age cluster, ranging from 253 Ma to 409 Ma, may record two rapid subduction events of the Paleo-Asian Ocean to the northern margin of the North China Craton during the Early Carboniferous to the Late Permian. Furthermore, the Early Mesozoic age cluster, ranging from 229 Ma to 250 Ma, may record the extensional process on the North China margin after its collision with the Southern Mongolia block.