Stratigraphy and chronology of Upper Cretaceous–lower Paleogene strata in Bolivia and northwest Argentina

Abstract

Research Article| June 01, 1997 Stratigraphy and chronology of Upper Cretaceous–lower Paleogene strata in Bolivia and northwest Argentina T. Sempere; T. Sempere 1Département T.O.A., Orstom, 213 rue Lafayette, 75010 Paris, France Search for other works by this author on: GSW Google Scholar R. F. Butler; R. F. Butler 2Department of Geosciences, University of Arizona, Tucson, Arizona 85721 Search for other works by this author on: GSW Google Scholar D. R. Richards; D. R. Richards 2Department of Geosciences, University of Arizona, Tucson, Arizona 85721 Search for other works by this author on: GSW Google Scholar L. G. Marshall; L. G. Marshall 3Institute of Human Origins, 1288 9th Street, Berkeley, California 94710 Search for other works by this author on: GSW Google Scholar W. Sharp; W. Sharp 4Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709 Search for other works by this author on: GSW Google Scholar C. C. Swisher, III C. C. Swisher, III 4Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709 Search for other works by this author on: GSW Google Scholar Author and Article Information T. Sempere 1Département T.O.A., Orstom, 213 rue Lafayette, 75010 Paris, France R. F. Butler 2Department of Geosciences, University of Arizona, Tucson, Arizona 85721 D. R. Richards 2Department of Geosciences, University of Arizona, Tucson, Arizona 85721 L. G. Marshall 3Institute of Human Origins, 1288 9th Street, Berkeley, California 94710 W. Sharp 4Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709 C. C. Swisher, III 4Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1997) 109 (6): 709–727. https://doi.org/10.1130/0016-7606(1997)109<0709:SACOUC>2.3.CO;2 Article history First Online: 01 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 T. Sempere, R. F. Butler, D. R. Richards, L. G. Marshall, W. Sharp, C. C. Swisher; Stratigraphy and chronology of Upper Cretaceous–lower Paleogene strata in Bolivia and northwest Argentina. GSA Bulletin 1997;; 109 (6): 709–727. doi: https://doi.org/10.1130/0016-7606(1997)109<0709:SACOUC>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 SocietyGSA Bulletin Search Advanced Search Abstract Integration of sequence stratigraphy, magnetostratigraphy, Ar/Ar dating, and paleontology considerably advances knowledge of the Late Cretaceous–early Paleogene chronostratigraphy and tectonic evolution of Bolivia and adjacent areas. The partly restricted marine El Molino Formation spans the Maastrichtian and Danian (°73–60.0 Ma). Deposition of the alluvial to lacustrine Santa Lucia Formation occurred between 60.0 and 58.2 Ma. The widespread erosional unconformity at the base of the Cayara Formation is 58.2 Ma. This unconformity separates the Upper Puca and Corocoro supersequences in Bolivia, and is thus coeval with the Zuni-Tejas sequence boundary of North America. The thick overlying Potoco and Camargo formations represent a late Paleocene–Oligocene foreland fill.The onset of shortening along the Pacific margin at °89 Ma initially produced rifting in the distal foreland. Santonian–Campanian eastward-onlapping deposits indicate subsequent waning of tectonic activity along the margin. Significant tectonism and magmatism resumed along the margin at °73 Ma and produced an abrupt increase in subsidence rate and other related phenomena in the basin. Subsidence was maximum between °71 and °66 Ma. Due to the early Maastrichtian global sea-level high, marine waters ingressed from the northwest into this underfilled basin. Subsidence decreased during the Late Maastrichtian and was low during the Danian. It increased again in the latest Danian, for which a slight transgression is recorded, and peaked in the early Selandian. Tectonism between 59.5 and 58.2 Ma produced a variety of deformational and sedimentary effects in the basin and correlates with the end of emplacement of the Coastal batholith. The subsequent 58.2 Ma major unconformity marks the onset of continental foreland basin development, which extended into Andean Bolivia during the late Paleocene–Oligocene interval. This basin underwent internal deformation as early as Eocene time in the Altiplano and Cordillera Oriental. These early structures, previously assigned to the late Oligocene–early Miocene orogeny, probably accommodated observed tectonic rotations in the Eocene–Oligocene. 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.