Diatom assemblages and sedimentary environments during the mid- to late-Holocene at the Mokoto site along the Okhotsk Sea in Hokkaido, Japan
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- Sato Hiroshi
- Institute of Natural and Environmental Sciences, Himeji Institute of Technology
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- Ihira Masashi
- Chiben Gakuen High School
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- Matsuda Isao
- Shiretoko Museum
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- Kumano Shigeru
- Kobe Shinna Women's College
Bibliographic Information
- Other Title
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- 珪藻遺骸群集からからみた北海道オホーツク海沿岸藻琴における 完新世中期~後期の堆積環境
Abstract
Diatom assemblages in sediments were analyzed to clarify sedimentary environments during the mid- to late-Holocene and to determine the upper limit of marine facies at the Mokoto site along the Okhotsk Sea in Hokkaido.<BR>There was a replacement of marine and brackish-water diatoms by freshwater ones at +1.80 m altitude. Marine and brackish-water diatoms occurred over 40 % at the horizons below +1.80 m altitude, where a marine diatom Cocconeis scutellum and brackish-water diatoms Bacillaria paradoxa, Navicula peregrina and Synedra tabulata occurred. This indicates that sedimentation took place under a lagoon-like environment. Peat accumulation and the dominance of freshwater epiphytic diatoms indicate peat moor environments at the horizons above +1.80 m altitude. At about 5,500 yrs BP, the Mokoto site changed from lagoon littoral to peat moor conditions. Based on the diatom assemblages in sediments, the upper limit of marine facies can be regarded to be +1.80 m altitude, indicating the mid-Holocene sea-level high stand at the Mokoto site.
Journal
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- Diatom
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Diatom 13 (0), 193-199, 1997
The Japanese Society of Diatomology
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Keywords
Details 詳細情報について
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- CRID
- 1390001205420506880
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- NII Article ID
- 130003356344
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- ISSN
- 09119310
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- Text Lang
- ja
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- Data Source
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- JaLC
- CiNii Articles
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- Abstract License Flag
- Disallowed