We
conducted an integrated paleomagnetic and stratigraphic
study on a 5,500 meter thick sedimentary sequence of red
beds in the Hoh Xil basin in order to obtain a chronostratigraphic
framework. On the basis of distinct intervals of magnetic
polarity and biostratigraphic datums, 13 magnetozones can
be recognized that range from Chrons C11 to C23 (30.1 -
51.0 Ma). A sharp increase in the sedimentation rate derived
from the magnetic stratigraphy suggests that basin subsidence
quickened near 40 Ma. We interpret this as a response to
crustal deformation caused by the final stage of India-Asia
collision during the middle Eocene (Chron C18).
