Sediments of the Lomonosov Ridge and Makarov Basin: A Pleistocene stratigraphy for the North Pole

Abstract

Research Article| July 01, 1985 Sediments of the Lomonosov Ridge and Makarov Basin: A Pleistocene stratigraphy for the North Pole THOMAS H. MORRIS; THOMAS H. MORRIS 1Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706 Search for other works by this author on: GSW Google Scholar DAVID L. CLARK; DAVID L. CLARK 1Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706 Search for other works by this author on: GSW Google Scholar STEVEN M. BLASCO STEVEN M. BLASCO 2Bedford Institute of Oceanography, Dartmouth, Nova Scotia B2Y 4A2 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1985) 96 (7): 901–910. https://doi.org/10.1130/0016-7606(1985)96<901:SOTLRA>2.0.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 THOMAS H. MORRIS, DAVID L. CLARK, STEVEN M. BLASCO; Sediments of the Lomonosov Ridge and Makarov Basin: A Pleistocene stratigraphy for the North Pole. GSA Bulletin 1985;; 96 (7): 901–910. doi: https://doi.org/10.1130/0016-7606(1985)96<901:SOTLRA>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 Sediments of 16 short cores taken as part of the Lomonosov Ridge Experiment (LOREX) can be organized into the first Pleistocene stratigraphy for the North Polar region. This stratigraphy can be correlated with stratigraphic units described from the Alpha-Chukchi areas, ∼300 km distant.The LOREX cores include at least 12 sedimentary subunits differentiated by texture, color, and carbonate content. The units are silty and arenaceous lutites and are principally glacial-marine. Benthic and planktonic foraminifera, degree of bioturbation, and Fe-Mn micro-nodule abundance generally are positively correlated. Foraminifera in core B-8, from 3,956 m in the Makarov Basin, may have been affected by CCD fluctuations that did not affect fossils in core B-24, from 1,600 m on the crest of the Lomonosov Ridge.The 12 stratigraphic units were deposited during the late Pleistocene and represent the same major sedimentary events as those of stratigraphic units K, L, and M of the Amerasian Basin. This correlation is excellent evidence for the remarkable and widespread uniform depositional style of glacial-marine sediment. Times of major glacial ice transport reflect deglaciation events in the central Arctic Ocean. Surface currents during deglaciation transport glacial ice in a more or less uniform pattern over at least 50% of the Arctic Ocean. Even thin sedimentary units deposited during relatively long time intervals are correlated over >500,000 km2. 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.