Seasonal stable isotope evidence for a strong Asian monsoon throughout the past 10.7 m.y

Abstract

Research Article| January 01, 2001 Seasonal stable isotope evidence for a strong Asian monsoon throughout the past 10.7 m.y David L. Dettman; David L. Dettman 1University of Arizona, Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Matthew J. Kohn; Matthew J. Kohn 2University of South Carolina, Department of Geological Sciences, Columbia, South Carolina 29208, USA Search for other works by this author on: GSW Google Scholar Jay Quade; Jay Quade 3University of Arizona, Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar F.J. Ryerson; F.J. Ryerson 4Institute for Geophysics and Planetary Physics, Lawrence Livermore National Laboratory, Livermore, California 94550, USA Search for other works by this author on: GSW Google Scholar Tank P. Ojha; Tank P. Ojha 5University of Arizona, Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Seyd Hamidullah Seyd Hamidullah 6National Center of Excellence in Geology, University of Peshawar, North West Frontier Province, Pakistan Search for other works by this author on: GSW Google Scholar Author and Article Information David L. Dettman 1University of Arizona, Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Matthew J. Kohn 2University of South Carolina, Department of Geological Sciences, Columbia, South Carolina 29208, USA Jay Quade 3University of Arizona, Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA F.J. Ryerson 4Institute for Geophysics and Planetary Physics, Lawrence Livermore National Laboratory, Livermore, California 94550, USA Tank P. Ojha 5University of Arizona, Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Seyd Hamidullah 6National Center of Excellence in Geology, University of Peshawar, North West Frontier Province, Pakistan Publisher: Geological Society of America Received: 31 May 2000 Revision Received: 25 Sep 2000 Accepted: 04 Oct 2000 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2001) 29 (1): 31–34. https://doi.org/10.1130/0091-7613(2001)029<0031:SSIEFA>2.0.CO;2 Article history Received: 31 May 2000 Revision Received: 25 Sep 2000 Accepted: 04 Oct 2000 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation David L. Dettman, Matthew J. Kohn, Jay Quade, F.J. Ryerson, Tank P. Ojha, Seyd Hamidullah; Seasonal stable isotope evidence for a strong Asian monsoon throughout the past 10.7 m.y. Geology 2001;; 29 (1): 31–34. doi: https://doi.org/10.1130/0091-7613(2001)029<0031:SSIEFA>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 Stable isotope profiles of fossil freshwater bivalve shells and mammal teeth provide a record of the seasonal δ18O variation in surface waters of the Himalayan foreland over the past 11 m.y. Between 3.1 and 10.7 Ma the δ18O of surface waters approached or exceeded 0‰ standard mean ocean water (SMOW) in the dry season. Since 9.5 Ma the magnitude of seasonal variability in δ18O has remained essentially unchanged. Both observations imply that the Tibetan Plateau had attained sufficient elevation and area prior to 10.7 Ma to support a strong Asian monsoon. These data also imply that the δ18O of wet-season rainfall was significantly more negative (−9.5‰ SMOW) prior to 7.5 Ma than after (−6.5‰ SMOW). If this change is attributable to a lessening of the amount effect in rainfall, this agrees with floral and soil geochemical data that indicate increasing aridity beginning at 7.5 Ma. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.