Detrital Zircon U-Pb Dating of Early Cretaceous Yingzuilazi Formation in Liuhe Basin,Northern Margin of North China Plate and Its Geological Significance
The Late Mesozoic westward subduction of the Paleo-Pacific Plate impacted the northern border of the North China Plate,causing significant tectonic deformation and large-scale magmatic activity.The Liuhe basin is situated on the North China Plate's northern border.The study of the Liuhe basin can be used to constrain the Late Mesozoic tectonic development of the North China Plate's northern border.The mineral composition of the basin samples is characterized by low quartz content and high rock debris and feldspar content,indicating that the sediment provenance primarily comes from the magmatic arc provenance area,according to mineral composition characteristics,sedimentary facies evolution,and detrital zircon U-Pb chronological characteristics of the basin samples.The age composition of detrital zircons from the two groups of samples from the Early Cretaceous Yingzuilazi Formation in the research area is similar,mainly in Late Mesozoic,supplemented by Paleoproterozoic.The major peak of the detrital zircons in L1-B178 samples is around 127 Ma,and the secondary peak is around 2 553 Ma.The Mesozoic sediment provenance may come from the igneous rocks of the basin,as the P303-B3 sample contains a major peak of around 126 Ma and a secondary peak of about 2 545 Ma.The maximum sedimentary age of the strata is(125±4)Ma,which is between the Early Cretaceous Barremian and Aptian stages and is compatible with the weighted average zircon age of(124.3±0.7)Ma for the rhyolite samples.The Liuhe basin,located on the northern boundary of the North China Plate,obtained its provenance from the ancient Pacific Plate subduction about(125±4)Ma,according to mineral composition features,sedimentary facies history,and detrital zircon U-Pb dating characteristics of basin samples.
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