Diatom biostratigraphy and datum levels of sediments from ODP Leg 167 sites, supplement to: Maruyama, Toshiaki (2000): Middle Miocene to Pleistocene diatom stratigraphy of Leg 167. In: Lyle, M; Koizumi, I; Richter, C; Moore, TC Jr (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 167, 1-48
Ocean Drilling Program Leg 167 represents the first time since 1978 that the North American Pacific margin was drilled to study ocean history. More than 7500 m of Quaternary to middle Miocene (14 Ma) sediments were recovered from 13 sites, representing the most complete stratigraphic sequence on the...
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ftdatacite:10.1594/pangaea.793330 2023-05-15T18:28:19+02:00 Diatom biostratigraphy and datum levels of sediments from ODP Leg 167 sites, supplement to: Maruyama, Toshiaki (2000): Middle Miocene to Pleistocene diatom stratigraphy of Leg 167. In: Lyle, M; Koizumi, I; Richter, C; Moore, TC Jr (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 167, 1-48 Maruyama, Toshiaki 2000 application/zip https://dx.doi.org/10.1594/pangaea.793330 https://doi.pangaea.de/10.1594/PANGAEA.793330 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.2973/odp.proc.sr.167.217.2000 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Ocean Drilling Program ODP Supplementary Collection of Datasets Collection article 2000 ftdatacite https://doi.org/10.1594/pangaea.793330 https://doi.org/10.2973/odp.proc.sr.167.217.2000 2022-02-08T16:24:46Z Ocean Drilling Program Leg 167 represents the first time since 1978 that the North American Pacific margin was drilled to study ocean history. More than 7500 m of Quaternary to middle Miocene (14 Ma) sediments were recovered from 13 sites, representing the most complete stratigraphic sequence on the California margin. Diatoms are found in most samples in variable abundance and in a moderately well-preserved state throughout the sequence, and they are often dominated by robust, dissolution-resistant species. The Neogene North Pacific diatom zonation of Yanagisawa and Akiba (1998, doi:10.5575/geosoc.104.395) best divides the Miocene to Quaternary sequences, and updated ages of diatom biohorizons estimated based on the geomagnetic polarity time scale of Cande and Kent (1995, doi:10.1029/94JB03098) are slightly revised to adjust the differences between the other zonations. Most of the early middle Miocene through Pleistocene diatom datum levels that have been proven to be of stratigraphic utility in the North Pacific appear to be nearly isochronous within the level of resolution constrained by sample spacing. The assemblages are characterized by species typical of middle-to-high latitudes and regions of high surface-water productivity, predominantly by Coscinodiscus marginatus, Stephanopyxis species, Proboscia barboi, and Thalassiothrix longissima. Latest Miocene through Pliocene assemblages in the region of the California Current, however, are intermediate between those of subarctic and subtropical areas. As a result, neither the existing tropical nor the subarctic (high latitude) zonal schemes were applicable for this region. An interval of pronounced diatom dissolution detected throughout the Pliocene sequence apparently correspond to a relatively warmer paleoceanographic condition resulting in a slackening of the southward flow of the California Current. Article in Journal/Newspaper Subarctic DataCite Metadata Store (German National Library of Science and Technology) Pacific |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Ocean Drilling Program ODP |
spellingShingle |
Ocean Drilling Program ODP Maruyama, Toshiaki Diatom biostratigraphy and datum levels of sediments from ODP Leg 167 sites, supplement to: Maruyama, Toshiaki (2000): Middle Miocene to Pleistocene diatom stratigraphy of Leg 167. In: Lyle, M; Koizumi, I; Richter, C; Moore, TC Jr (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 167, 1-48 |
topic_facet |
Ocean Drilling Program ODP |
description |
Ocean Drilling Program Leg 167 represents the first time since 1978 that the North American Pacific margin was drilled to study ocean history. More than 7500 m of Quaternary to middle Miocene (14 Ma) sediments were recovered from 13 sites, representing the most complete stratigraphic sequence on the California margin. Diatoms are found in most samples in variable abundance and in a moderately well-preserved state throughout the sequence, and they are often dominated by robust, dissolution-resistant species. The Neogene North Pacific diatom zonation of Yanagisawa and Akiba (1998, doi:10.5575/geosoc.104.395) best divides the Miocene to Quaternary sequences, and updated ages of diatom biohorizons estimated based on the geomagnetic polarity time scale of Cande and Kent (1995, doi:10.1029/94JB03098) are slightly revised to adjust the differences between the other zonations. Most of the early middle Miocene through Pleistocene diatom datum levels that have been proven to be of stratigraphic utility in the North Pacific appear to be nearly isochronous within the level of resolution constrained by sample spacing. The assemblages are characterized by species typical of middle-to-high latitudes and regions of high surface-water productivity, predominantly by Coscinodiscus marginatus, Stephanopyxis species, Proboscia barboi, and Thalassiothrix longissima. Latest Miocene through Pliocene assemblages in the region of the California Current, however, are intermediate between those of subarctic and subtropical areas. As a result, neither the existing tropical nor the subarctic (high latitude) zonal schemes were applicable for this region. An interval of pronounced diatom dissolution detected throughout the Pliocene sequence apparently correspond to a relatively warmer paleoceanographic condition resulting in a slackening of the southward flow of the California Current. |
format |
Article in Journal/Newspaper |
author |
Maruyama, Toshiaki |
author_facet |
Maruyama, Toshiaki |
author_sort |
Maruyama, Toshiaki |
title |
Diatom biostratigraphy and datum levels of sediments from ODP Leg 167 sites, supplement to: Maruyama, Toshiaki (2000): Middle Miocene to Pleistocene diatom stratigraphy of Leg 167. In: Lyle, M; Koizumi, I; Richter, C; Moore, TC Jr (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 167, 1-48 |
title_short |
Diatom biostratigraphy and datum levels of sediments from ODP Leg 167 sites, supplement to: Maruyama, Toshiaki (2000): Middle Miocene to Pleistocene diatom stratigraphy of Leg 167. In: Lyle, M; Koizumi, I; Richter, C; Moore, TC Jr (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 167, 1-48 |
title_full |
Diatom biostratigraphy and datum levels of sediments from ODP Leg 167 sites, supplement to: Maruyama, Toshiaki (2000): Middle Miocene to Pleistocene diatom stratigraphy of Leg 167. In: Lyle, M; Koizumi, I; Richter, C; Moore, TC Jr (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 167, 1-48 |
title_fullStr |
Diatom biostratigraphy and datum levels of sediments from ODP Leg 167 sites, supplement to: Maruyama, Toshiaki (2000): Middle Miocene to Pleistocene diatom stratigraphy of Leg 167. In: Lyle, M; Koizumi, I; Richter, C; Moore, TC Jr (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 167, 1-48 |
title_full_unstemmed |
Diatom biostratigraphy and datum levels of sediments from ODP Leg 167 sites, supplement to: Maruyama, Toshiaki (2000): Middle Miocene to Pleistocene diatom stratigraphy of Leg 167. In: Lyle, M; Koizumi, I; Richter, C; Moore, TC Jr (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 167, 1-48 |
title_sort |
diatom biostratigraphy and datum levels of sediments from odp leg 167 sites, supplement to: maruyama, toshiaki (2000): middle miocene to pleistocene diatom stratigraphy of leg 167. in: lyle, m; koizumi, i; richter, c; moore, tc jr (eds.) proceedings of the ocean drilling program, scientific results, college station, tx (ocean drilling program), 167, 1-48 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2000 |
url |
https://dx.doi.org/10.1594/pangaea.793330 https://doi.pangaea.de/10.1594/PANGAEA.793330 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Subarctic |
genre_facet |
Subarctic |
op_relation |
https://dx.doi.org/10.2973/odp.proc.sr.167.217.2000 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.793330 https://doi.org/10.2973/odp.proc.sr.167.217.2000 |
_version_ |
1766210747004616704 |