Middle Miocene to Pleistocene diatom biostratigraphy of the Northwest Pacific at sites 1150 and 1151

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doi: 10.2973/odp.proc.sr.186.106.2003
Author(s): Maruyama, Toshiaki; Shiono, Masamichi
Ocean Drilling Program, Leg 186, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
Yamagata University, Department of Earth and Environmental Sciences, Yamagata, Japan
Other:
Carnegie Institution of Washington, United States
Ocean Drilling Program, United States
University of Tokyo, Japan
Stockholm University, Sweden
Hokkaido University, Japan
Pukyong National University, South Korea
Florida State University, United States
Indiana State University, United States
University of Edinburgh, United Kingdom
Shizuoka University, Japan
Universität Freiburg, Federal Republic of Germany
Lamont-Doherty Earth Observatory, United States
Volume Title: Proceedings of the Ocean Drilling Program, scientific results, Western Pacific geophysical observatories; covering Leg 186 of the cruises of drilling vessel JOIDES Resolution; Yokohama, Japan, to Yokohama, Japan; sites 1150 and 1151, 14 June-14 August 1999
Volume Author(s): Suyehiro, Kiyoshi; Sacks, I. Selwyn; Acton, Gary D.; Acierno, Michael J.; Araki, Eiichiro; Ask, Maria V. S.; Ikeda, Akihiro; Kanamatsu, Toshiya; Kim, Gil Young; Li, Jingfen; Linde, Alan T.; McWhorter, Paul N.; Mora, Germán; Najman, Yanina M. R.; Niitsuma, Nobuaki; Pandit, Benoy K.; Roller, Sybille; Saito, Saneatsu; Sakamoto, Tatsuhiko; Shinohara, Masanao; Sun, Yue-Feng
Source: Proceedings of the Ocean Drilling Program, scientific results, Western Pacific geophysical observatories; covering Leg 186 of the cruises of drilling vessel JOIDES Resolution; Yokohama, Japan, to Yokohama, Japan; sites 1150 and 1151, 14 June-14 August 1999, Kiyoshi Suyehiro, I. Selwyn Sacks, Gary D. Acton, Michael J. Acierno, Eiichiro Araki, Maria V. S. Ask, Akihiro Ikeda, Toshiya Kanamatsu, Gil Young Kim, Jingfen Li, Alan T. Linde, Paul N. McWhorter, Germán Mora, Yanina M. R. Najman, Nobuaki Niitsuma, Benoy K. Pandit, Sybille Roller, Saneatsu Saito, Tatsuhiko Sakamoto, Masanao Shinohara and Yue-Feng Sun; Ocean Drilling Program, Leg 186, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results (CD ROM), Vol.186, 38p. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 1096-2514
Note: In English. Includes appendix; available only on CD-ROM in PDF format and on the Web in PDF or HTML. 73 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; illus., incl. 6 tables, 4 plates
Summary: Late Neogene biostratigraphy of diatoms has been investigated from two sites occupied during Ocean Drilling Program (ODP) Leg 186 off the coast of northeast Japan. A unique aspect of ODP Leg 186 was the installation of two permanent borehole geophysical observatories at the deep-sea terrace along the Japan Trench. The Neogene subsidence history of the forearc was documented from both Sites 1150 and 1151, and Quaternary to middle Miocene (16 Ma) sediments represent a nearly continuous stratigraphic sequence including numerous ash records, especially during the past 9 m.y. Diatoms are found in most samples in variable abundance and in a moderately well preserved state throughout the sequence. The assemblages are characterized consistently by age-diagnostic species of Denticulopsis and Neodenticula found in regions of high surface water productivity typical of middle to high latitudes. The Neogene North Pacific diatom zonation divides the Miocene to Quaternary sequences fundamentally well, except that the latest Miocene through early Pliocene Thalassiosira oestrupii Subzone is not applicable. Miocene and late Pliocene through Pleistocene diatom datum levels that have been proven to be of great stratigraphic utility in the North Pacific Ocean appear to be nearly isochronous within the level of resolution constrained by core catcher sample spacing. The taxonomy and stratigraphy of previously described species determined to be useful across the Miocene/Pliocene boundary have been investigated on the basis of the evolutionary changes within the Thalassiosira trifulta group. The biostratigraphically important forms belonging to the genus Thalassiosira have been illustrated with scanning electron micrographs.
Year of Publication: 2003
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Assemblages; Biostratigraphy; Biozones; Cenozoic; Diatoms; Japan Trench; Leg 186; Marine sediments; Microfossils; Middle Miocene; Miocene; Neogene; North Pacific; Northwest Pacific; ODP Site 1150; ODP Site 1151; Ocean Drilling Program; Pacific Ocean; Plantae; Pleistocene; Quaternary; SEM data; Sediments; Species diversity; Tertiary; Thalassiosira; West Pacific
Coordinates: N384500 N384500 E1432000 E1432000
N391100 N391100 E1432000 E1432000
Record ID: 2004011512
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