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Transfer of Nazca Ridge Pelagic Sediments to the Peru Continental Margin
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1974
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Sedimentary RecordEngineeringPaleoceanographyContinental TectonicsSedimentary GeologyTectonic EvolutionOceanographyEarth ScienceRegional GeologySocial SciencesContinental MarginPeru Continental MarginMarine GeologyGeographyGeologyPeru TrenchSedimentologyTectonicsEarth SciencesPaleoecologyOrogenyGsa Bulletin 1974
Research Article| May 01, 1974 Transfer of Nazca Ridge Pelagic Sediments to the Peru Continental Margin L. D. KULM; L. D. KULM 1School of Oceanography, Oregon State University, Corvallis, Oregon 97331 Search for other works by this author on: GSW Google Scholar JOHANNA M. RESIG; JOHANNA M. RESIG 2Hawaii Institute of Geophysics, University of Hawaii, Honolulu, Hawaii 96822 Search for other works by this author on: GSW Google Scholar TED C. MOORE, JR.; TED C. MOORE, JR. 3School of Oceanography, Oregon State University, Corvallis, Oregon 97331 Search for other works by this author on: GSW Google Scholar VICTOR J. ROSATO VICTOR J. ROSATO 3School of Oceanography, Oregon State University, Corvallis, Oregon 97331 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1974) 85 (5): 769–780. https://doi.org/10.1130/0016-7606(1974)85<769:TONRPS>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation L. D. KULM, JOHANNA M. RESIG, TED C. MOORE, VICTOR J. ROSATO; Transfer of Nazca Ridge Pelagic Sediments to the Peru Continental Margin. GSA Bulletin 1974;; 85 (5): 769–780. doi: https://doi.org/10.1130/0016-7606(1974)85<769:TONRPS>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 A complex set of lithologies, including calcareous oozes, hemipelagites, and turbidites, was recovered from the landward wall of the Peru Trench at its intersection with the Nazca Ridge. The sequence occurs at a water depth of 4,900 m and overlies an acoustic basement in the lowermost continental slope. Early Pliocene calcareous ooze overlies Pliocene to Quaternary ooze; both of these deposits are sandwiched between late Pleistocene (⩽ 400,000 yr), organic-rich turbidites and hemipelagic deposits typical of the Peru Trench and margin.Planktonic and benthic foraminiferal assemblages indicate that the early Pliocene ooze originally was deposited on the Nazca Ridge above the calcium carbonate compensation depth (4,000 m) and to the west of the cool Peru-Chile Current. The Pliocene-Pleistocene ooze contains a temperate fauna associated with the Peru-Chile Current. Block faulting at the terminus of the Nazca Ridge displaced the calcareous ooze 1,900 m from the top of the ridge to the trench below. Apparently these lithologies were then folded against or thrust beneath the lower continental slope within the past 400,000 yr.The stratigraphic sequence and the physiographic setting of the Nazca Ridge–Peru Trench intersection indicate convergence of the Nazca Ridge with the South American block. A minimum convergence rate of 0.8 cm/yr is calculated for the Pleistocene based upon the past and present geographic positions of the calcareous ooze. The best estimate of the rate is 2.8 cm/yr. 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.