Geophysical Investigations in the Submerged Argentine Coastal Plain

Research Article| March 01, 1963 Geophysical Investigations in the Submerged Argentine Coastal Plain: Part 1. Buenos Aires to Peninsula Valdez M EWING; M EWING Lamont Geological Observatory, Columbia University, Palisades, N. Y Search for other works by this author on: GSW Google Scholar W. J LUDWIG; W. J LUDWIG Lamont Geological Observatory, Columbia University, Palisades, N. Y Search for other works by this author on: GSW Google Scholar J. I EWING J. I EWING Lamont Geological Observatory, Columbia University, Palisades, N. Y Search for other works by this author on: GSW Google Scholar Author and Article Information M EWING Lamont Geological Observatory, Columbia University, Palisades, N. Y W. J LUDWIG Lamont Geological Observatory, Columbia University, Palisades, N. Y J. I EWING Lamont Geological Observatory, Columbia University, Palisades, N. Y Publisher: Geological Society of America Received: 22 Mar 1962 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1963, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1963) 74 (3): 275–292. https://doi.org/10.1130/0016-7606(1963)74[275:GIITSA]2.0.CO;2 Article history Received: 22 Mar 1962 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation M EWING, W. J LUDWIG, J. I EWING; Geophysical Investigations in the Submerged Argentine Coastal Plain: Part 1. Buenos Aires to Peninsula Valdez. GSA Bulletin 1963;; 74 (3): 275–292. doi: https://doi.org/10.1130/0016-7606(1963)74[275:GIITSA]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 SocietyGSA Bulletin Search Advanced Search Abstract This report describes the results of seismic-refraction measurements conducted on the submerged coastal plain of the Buenos Aires province. Two elongated asymmetrical sediment-filled depressions in the Precambrian basement complex, the Rio Salado basin and Bahia Blanca basin (which includes the Rio Negro basin), were traced seaward. The two basins, separated by the Tandil high, trend approximately southeast. Each is about 150–200 km wide and at least 700 km long. No indication of closure was observed at the seaward end although both basins were traced well beyond the edge of the continental shelf.Four seismic layers overlying the basement were determined in an unconsolidated layer (A), a semi-consolidated layer (B), and two zones in a consolidated layer (C) and (D). These layers are identified as Quaternary and Pliocene-Miocene, Lower Miocene and Upper Cretaceous, Upper Paleozoic, and Lower Paleozoic to a depth of about 8.0 km based on well logs and seismic-refraction data made available by Yacimientos Petroliferos Fiscales.A sub-basement layer (6.84 km/sec) was measured under the continental rise at an average depth of 10–12 km. The Mohorovicic discontinuity was measured on two profiles at a depth of 26.5 km under the outer portion of the continental shelf.The basement configuration and stratigraphic sequence along several traverses are shown by seismic sections. A 10-km interval basement-contour map of the area shows the outline of the basement as determined by marine seismic data together with the correlation to YPF seismic-refraction measurements on land. 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.