E‐W and S‐N Differences in the Sedimentary Cover and Crystalline Crust in the Cratonic Ordos Basin From Receiver Function Analysis

Abstract

Basins are important units of the Earth's surface and are formed at different geological times and in different tectonic environments. The crust in a basin is generally composed of sedimentary and bedrock layers. The sedimentary layer is generally rich in mineral and petroleum deposits. The low-velocity nature of sedimentary layer often results in false images and errors for the crystalline crust and lithospheric mantle and magnifies seismic-wave amplitude (Aki & Richards, 1980) to impose larger seismic hazards. The crystalline crust mainly consists of igneous and metamorphic rocks and records the characteristics of stress fields, temperature and pressure in the deep crust (Christensen, 1996). In general, basement evolution is closely related to that of the overlying sedimentary cover and controls the deformation of sedimentary units under certain conditions. Therefore, the simultaneous study of the fine structure and rock composition of the sedimentary cover and the underlying bedrock layer can shed light on the tectonic evolution of a basin and the related dynamic mechanism and provide useful information for oil and gas exploration and imaging of the deep crust and mantle.