Location and shape of the Lhasa Terrane prior to India-Asia collision

The precollisional location and shape of the Lhasa terrane are crucial for constraining the closure of the Neo-Tethys Ocean and the ensuing India-Asia collision; however, estimation of these features of the Lhasa terrane remains highly controversial. Here, we carried out a new paleomagnetic investigation on the Lower Cretaceous Duoni Formation red beds in the central-eastern Lhasa terrane. The tilt-corrected site-mean direction is declination (D (sub s) ) = 339.0 degrees , inclination (I (sub s) ) = 26.8 degrees , k (sub s) = 78.4, and alpha 95 = 2.3 degrees (k-precision parameter; alpha 95-the radius that the mean direction lies within 95% confidence; s-stratigraphic coordinates) (N = 50), corresponding to a paleopole at 64.2 degrees N, 324.2 degrees E, with A95 = 1.9 degrees (A95-the radius that the mean pole lies within 95% confidence). These new paleomagnetic data pass a positive fold test and indicate that the studied area was located at 14.3 + or - 1.9 degrees N during the Early Cretaceous. No significant inclination shallowing is present in the Lower Cretaceous Duoni Formation red beds. Our new results, combined with previously published reliable Cretaceous paleomagnetic results, show that the Lhasa terrane was located at a paleolatitude of approximately 22.9 degrees N to 10.1 degrees N from west to east and was oriented at approximately 298 degrees -296 degrees prior to India-Asia collision.