摘要
During Early Cretaceous,NNE-trending extensional basins filling with various volcanic-sedimentary formations developed in the northeastern Da Hinggan Ling(Mts.),northeastern China.This study investigates the formation age and geological background of Jiufengshan Formation,providing insights into its tectonic setting and formation mechanisms.Detrital zircons from four sandstone samples of Jiufengshan Formation in Nenjiang area indicate a maximum depositional age of 116±1 Ma,corresponding to late Early Cretaceous.Petrographic analysis and zircon age peak comparisons suggest these sandstones originated from proximal deposits with nearby provenances of earlier and contemporaneous volcanic rocks.Further research on the sandstone framework and trace elements in detrital zircons indicates that the formation process of Jiufengshan Formation was likely related to the low-angle subduction of the Paleo-Pacific plate.
基金
Supported by the National Key R&D Program(No.2017YFC0601401-03).
