Abstract: Paleocene lavas of the Dianzhong Formation preserved in the Linzhou Basin of South Tibet provide a unique opportunity to constrain the initial geometry of the India-Asia collision; however, earlier studies argued a complex magnetic signature resulting from thermal and/or chemical remagnetizations.To better characterize the remanences obtained from the Dianzhong lavas, we carried out an intraformational conglomerate test on a previously-studied section in the Linzhou Basin. The positive conglomerate test suggests that the characteristic remanences reported from the Dianzhong Formation are primary. The updated Paleocene pole confirms a paleolatitude of 6.7° ± 4.4°N for the Lhasa terrane and positions the southern margin of Asia in the equatorial humid belt. An initial collision, between India, Asia and an intra-oceanic arc in the equatorial humid belt, may have intensified silicate weathering and resulted in an extra consummation of carbon dioxide, which contributes to a long-term cooling of the
Earth during the Cenozoic.