EarthRef.org Digital Archive (ERDA) -- Magnetostratigraphy study of a Late Cretaceous-Paleogene succession in the east Xining bas

Description
A bright point of this research work concerns a complete Late Cretaceous to Paleogene sedimentary succession with two distinct unconformities in the foreland Xining basin, which may best record the far field response to the transition from the Neo-Tethys oceanic subduction to the initial India-Eurasia collision. This has been a hot topic in southern Tibet but its far-field effect has been paid little attention. We documented this event occurring in latest Cretaceous (69-65Ma) by a sedimentary hiatus of about 3.7 Ma duration, through an integrated study of the magnetostratigraphy, AMS (anisotropy of the magnetic susceptibility) measurement and detrital zircon U-Pb and paleocurrent provenance analysis of a Late-Cretaceous to Paleogene succession in the eastern Xining Basin. We also documented two other events, one occurring in Eocene at 53-47 Ma, another in Oligocene at about 30 Ma, which reflect increasing effects of the India-Asia collision in Paleogene.