Backscattered electron imagery analysis of early Pliocene laminated Ethmodiscus ooze, Site 1010

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doi: 10.2973/odp.proc.sr.167.233.2000
Author(s): Pike, Jennifer
Author Affiliation(s): Primary:
University of Wales, Department of Earth Sciences, Cardiff, United Kingdom
Other:
Hokkaido University, Japan
Ocean Drilling Program, United States
California State University at Long Beach, United States
Stockholm University, Sweden
Museum National d'Histoire Naturelle, France
University of California at Santa Cruz, United States
Lamont-Doherty Earth Observatory, United States
Université Louis Pasteur, France
Universita di Padova, Italy
Universität München, Federal Republic of Germany
Rosenstiel School of Marine and Atmospheric Science, United States
Indiana University of Pennsylvania, United States
Florida State University, United States
Oregon State University, United States
Universidad Nacional Autónoma de Mexico, United States
Yamagata University, Japan
Mount Allison University, Canada
University of Southampton, United Kingdom
Universidad de Sonora, Mexico
University of Erlangen, Federal Republic of Germany
University of Tokyo, Japan
University College London, United Kingdom
Geological Survey of Japan, Japan
Volume Title: Proceedings of the Ocean Drilling Program, scientific results, California margin; covering Leg 167 of the cruises of the drilling vessel JOIDES Resolution, Acapulco, Mexico, to San Francisco, California, sites 1010-1022, 20 April-16 June 1996
Volume Author(s): Lyle, Mitchell; Koizumi, Itaru; Richter, Carl; Behl, Richard J.; Bodén, Per; Caulet, Jean-Pierre; Delaney, Margaret L.; deMenocal, Peter; Desmet, Marc; Fornaciari, Eliana; Hayashida, Akira; Heider, Franz; Hood, Julie A.; Hovan, Steven A.; Janecek, Thomas R.; Janik, Aleksandra G.; Kennett, James P.; Lund, David; Machain Castillo, Maria L.; Maruyama, Toshiaki; Merrill, Russell B.; Mossman, David J.; Pike, Jennifer; Ravelo, A. Christina; Rozo Vera, Gloria A.; Stax, Rainer; Tada, Ryuji; Thurow, Jürgen W.; Yamamoto, Masanobu; Nessler, Susan; Miller, Christine M.; Peters, Lorri L.
Source: Proceedings of the Ocean Drilling Program, scientific results, California margin; covering Leg 167 of the cruises of the drilling vessel JOIDES Resolution, Acapulco, Mexico, to San Francisco, California, sites 1010-1022, 20 April-16 June 1996, Mitchell Lyle, Itaru Koizumi, Carl Richter, Richard J. Behl, Per Bodén, Jean-Pierre Caulet, Margaret L. Delaney, Peter deMenocal, Marc Desmet, Eliana Fornaciari, Akira Hayashida, Franz Heider, Julie A. Hood, Steven A. Hovan, Thomas R. Janecek, Aleksandra G. Janik, James P. Kennett, David Lund, Maria L. Machain Castillo, Toshiaki Maruyama, Russell B. Merrill, David J. Mossman, Jennifer Pike, A. Christina Ravelo, Gloria A. Rozo Vera, Rainer Stax, Ryuji Tada, Jürgen W. Thurow, Masanobu Yamamoto, Susan Nessler, Christine M. Miller and Lorri L. Peters. Proceedings of the Ocean Drilling Program, Scientific Results, Vol.167, p.207-212. Publisher: Texas A & M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 0884-5891
Note: In English. Data report. 26 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; all chapters are also available on the included CD-ROM and on the Web in PDF format; illus.
Summary: Giant diatoms from the genus Ethmodiscus Castracane are a ubiquitous but relatively rare component of the warm-surface ocean plankton. Ethmodiscus oozes have been documented as occurring during the geological past; however, the debate over the mechanism of formation of these oozes is still unresolved. This report documents the nature and occurrence of early Pliocene Ethmodiscus ooze from Ocean Drilling Program Site 1010. The sediment fabric of the ooze interval has been analyzed using scanning electron microscopy, specifically backscattered electron imagery. This has shown that the sediment consists of an irregular alternation between laminae rich in Ethmodiscus fragments; mixed-sediment laminae comprising silt grains, clays, and nannofossils; and horizontal to subhorizontal burrows filled with nannofossil clay that is similar to sediment deposited above and below the diatom-rich interval. The short stratigraphic occurrence of Ethmodiscus ooze at Site 1010 precludes any substantial contribution to the debate over the mechanism of formation of these deep-sea oozes; it is suggested, however, that further studies should consider the concentration (and subsequent deposition) of these giant diatoms along convergent oceanic frontal zones.
Year of Publication: 2000
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Backscattering; California; Cenozoic; Clastic sediments; Continental margin; Cores; Diatoms; Discoasteridae; East Pacific; Ethmodiscus; Image analysis; Laminations; Leg 167; Lower Pliocene; Microfossils; Nannofossils; Neogene; North Pacific; Northeast Pacific; ODP Site 1010; Ocean Drilling Program; Ooze; Pacific Ocean; Planar bedding structures; Plantae; Pliocene; SEM data; Sedimentary structures; Sediments; Tertiary; United States
Coordinates: N295754 N295754 W1180602 W1180602
Record ID: 2000080031
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