相模層群長沼層（中部更新統）産の介形虫化石群に基づく古環境解析
本研究は，神奈川県に分布する相模層群長沼層産の海生介形虫化石群に基づき，海洋酸素同位体ステージ15（MIS 15）の約60万年前の古環境（水深，水温）を現生アナログ法（MAT）を用いて推定した．その結果，長沼層の古環境は，現在の瀬戸内海などの西南日本沿岸の水深25～41 mの海域に，最も類似することが明らかになった．これらの西南日本沿岸域の水温値 （夏：16～28℃，冬：6～11℃）を，現在の相模湾の水温データと比較したところ，夏の水温は水深30 m以浅では少なくとも2℃ほど高いが，40 m付近では現在とほぼ同じか2℃ほど低く，冬の水温は40 m以浅で少なくとも2℃ほど低いことが明らかになった...
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| Published in | 地質調査研究報告 Vol. 70; no. 1-2; pp. 5 - 16 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English Japanese |
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国立研究開発法人 産業技術総合研究所 地質調査総合センター
29.03.2019
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| ISSN | 1346-4272 2186-490X |
| DOI | 10.9795/bullgsj.70.5 |
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| Abstract | 本研究は，神奈川県に分布する相模層群長沼層産の海生介形虫化石群に基づき，海洋酸素同位体ステージ15（MIS 15）の約60万年前の古環境（水深，水温）を現生アナログ法（MAT）を用いて推定した．その結果，長沼層の古環境は，現在の瀬戸内海などの西南日本沿岸の水深25～41 mの海域に，最も類似することが明らかになった．これらの西南日本沿岸域の水温値 （夏：16～28℃，冬：6～11℃）を，現在の相模湾の水温データと比較したところ，夏の水温は水深30 m以浅では少なくとも2℃ほど高いが，40 m付近では現在とほぼ同じか2℃ほど低く，冬の水温は40 m以浅で少なくとも2℃ほど低いことが明らかになった．本研究は約60万年前（MIS 15）の日本列島沿岸浅海域における古水温の変動を，定量的に推定した初の研究例である． |
|---|---|
| AbstractList | 本研究は，神奈川県に分布する相模層群長沼層産の海生介形虫化石群に基づき，海洋酸素同位体ステージ15（MIS 15）の約60万年前の古環境（水深，水温）を現生アナログ法（MAT）を用いて推定した．その結果，長沼層の古環境は，現在の瀬戸内海などの西南日本沿岸の水深25～41 mの海域に，最も類似することが明らかになった．これらの西南日本沿岸域の水温値 （夏：16～28℃，冬：6～11℃）を，現在の相模湾の水温データと比較したところ，夏の水温は水深30 m以浅では少なくとも2℃ほど高いが，40 m付近では現在とほぼ同じか2℃ほど低く，冬の水温は40 m以浅で少なくとも2℃ほど低いことが明らかになった．本研究は約60万年前（MIS 15）の日本列島沿岸浅海域における古水温の変動を，定量的に推定した初の研究例である． |
| Author | 田中, 源吾 小沢, 広和 |
| Author_xml | – sequence: 1 fullname: 田中, 源吾 organization: 金沢大学 – sequence: 1 fullname: 小沢, 広和 organization: 日本大学 |
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| Copyright | 2019 産業技術総合研究所 地質調査総合センター |
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| DOI | 10.9795/bullgsj.70.5 |
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| References_xml | – reference: Tanaka, G. (2008) Recent benthonic ostracod assemblages as indicators of the Tsushima warm current in the southwestern Sea of Japan. Hydrobiologia, 598, 271–284. 10.1007/s10750-007-9162-6 – reference: Machida, H., Arai, F. and Sugihara, S. (1980) Tephrochro nological study on the middle Pleistocene deposits in the Kanto and Kinki districts, Japan. Quaternary Res. (Daiyonki-Kenkyu), 19, 233–261. 10.4116/jaqua.19.233 – reference: Hongo, M. and Mizuno, K. (2009) Pollen assemblages of Fukasaku A-1 drilling core, Saitama Prefecture, central Kanto plain, Japan. Bull. Geol. Surv. Japan, 60, 559–579. (in Japanese with English abstract) 10.9795/bullgsj.60.559 – reference: Ozawa, H. and Ishii, T. (2014) Shallow-marine ostracods from the Lower Pleistocene Kazusa Group in the Tama Hills, central Japan, with their biogeographical significance in the Northwest Pacific coast. Paleontol. Res., 18, 189–210. 10.2517/2014PR018 – reference: Berger, W. H. and Jansen, E. (1994) Mid-Pleistocene climate shift: The Nansen Connection. In Johannessen, O. M., Muench, R. D., Overlands, J. E., eds., The Polar Oceans and their role in shaping the global environment. American Geophysical Union, Geophysical Monographs 84, 295–311. – reference: Frydl, P. M. (1982) Holocene ostracods in the southern Boso Peninsula. Bull. Univ. Museum, Univ. Tokyo, 20, 61–140. – reference: Mitsuoka, T., Yonezawa, H. and Yokohama Sub Danken-Group (1977) On the Quaternary System around Yokohama (1): Naganuma and Byoubugaura Formations around Taya City. Bull. Assoc. Kanto Quaternary Res. (Kanto-no-Yonki), no. 4, 44–52. (in Japanese) – reference: Ozawa, H., Ikehara, K. and Katayama, H (1999) Recent ostracode fauna in the northeastern part of the Japan Sea, off northwestern Hokkaido. 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| Title | 相模層群長沼層（中部更新統）産の介形虫化石群に基づく古環境解析 |
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