High times on the Tibetan Plateau: Paleoelevation of the Thakkhola graben, Nepal

Abstract

Research Article| April 01, 2000 High times on the Tibetan Plateau: Paleoelevation of the Thakkhola graben, Nepal Carmala N. Garzione; Carmala N. Garzione 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar David L. Dettman; David L. Dettman 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Jay Quade; Jay Quade 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Peter G. DeCelles; Peter G. DeCelles 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Robert F. Butler Robert F. Butler 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Geology (2000) 28 (4): 339–342. https://doi.org/10.1130/0091-7613(2000)28<339:HTOTTP>2.0.CO;2 Article history received: 07 Sep 1999 rev-recd: 22 Dec 1999 accepted: 05 Jan 2000 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Carmala N. Garzione, David L. Dettman, Jay Quade, Peter G. DeCelles, Robert F. Butler; High times on the Tibetan Plateau: Paleoelevation of the Thakkhola graben, Nepal. Geology 2000;; 28 (4): 339–342. doi: https://doi.org/10.1130/0091-7613(2000)28<339:HTOTTP>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract East-west extension in the Tibetan Plateau is generally assumed to have resulted from gravitational collapse following thickening and uplift. On the basis of this assumption, several studies have dated east-west extensional structures to determine when the plateau attained its current high elevation. However, independent estimates of elevation are needed to determine whether extension occurred before, during, or after the plateau achieved its current elevation. Because the isotopic composition of meteoric water decreases with increasing elevation, significant change in local elevation throughout the Thakkhola graben depositional history should be recorded by change in δ18O values of fluvial and lacustrine carbonates. The δ18O values of −16‰ to −23‰ of Thakkhola graben carbonates reflect meteoric water values similar to modern values and suggest that the southern Tibetan Plateau attained its current elevation prior to east-west extension. Initiation of Thakkhola graben extension is constrained between 10 and 11 Ma, based on magnetostratigraphy of the older Tetang Formation. The δ13C values of soil carbonates suggest an age younger than 8 Ma for the base of the Thakkhola Formation. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.