High-level surfaces, plateau uplift, and foreland development, Bolivian central Andes

Abstract

Research Article| August 01, 1993 High-level surfaces, plateau uplift, and foreland development, Bolivian central Andes T. L. Gubbels; T. L. Gubbels 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853-1504 Search for other works by this author on: GSW Google Scholar B. L. Isacks; B. L. Isacks 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853-1504 Search for other works by this author on: GSW Google Scholar E. Farrar E. Farrar 2Department of Geological Sciences, Queen's University, Kingston, Ontario K7L 3N6, Canada Search for other works by this author on: GSW Google Scholar Geology (1993) 21 (8): 695–698. https://doi.org/10.1130/0091-7613(1993)021<0695:HLSPUA>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation T. L. Gubbels, B. L. Isacks, E. Farrar; High-level surfaces, plateau uplift, and foreland development, Bolivian central Andes. Geology 1993;; 21 (8): 695–698. doi: https://doi.org/10.1130/0091-7613(1993)021<0695:HLSPUA>2.3.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 Newly dated Tertiary strata in the Bolivian central Andean plateau and synthesis of the Tertiary record in the adjacent Subandean fold-thrust belt constrain the age of deformation in both regions. Age of deformation within the plateau is determined by dated crosscutting relations associated with a regionally extensive high-level surface known as the San Juan del Oro surface. New 40Ar-39Ar dates on undeformed strata above the high-level surface preclude significant upper-crustal shortening within the Eastern Cordillera after 10 Ma. Tertiary strata within the adjacent Subandean region demonstrate that formation of the fold-thrust belt occurred after 10 Ma. On the basis of these data, we propose a two-stage model of late Cenozoic Andean growth that links plateau uplift to the development of the fold-thrust belt. In the first stage, early plateau uplift occurred in response to widespread compressional deformation of the plateau (Eastern Cordillera and Altiplano). During the second stage, beginning after 10 Ma, upper-crustal deformation within the plateau terminated, and the Subandean fold-thrust belt developed. Crustal-scale eastward thrusting along the eastern margin of the Eastern Cordillera drove Subandean folding and thrusting; the Eastern Cordillera served as the "bulldozer" for the deforming Subandean wedge. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.