Oligocene and Early Miocene floras in Japan and paleoclimatic analysis based on leaf physiognomy
| Project/Area Number |
17540446
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | National Museum of Nature and Science, Tokyo |
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Principal Investigator |
UEMURA Kazuhiko National Museum of Nature and Science, Tokyo, National Museum of Nature and Science, Department of Geology and Paleontology, Head (50000138)
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| Co-Investigator(Kenkyū-buntansha) |
YAMADA Toshihiro Kanazawa University, Graduate School of Natural Science and Technology, Lecturer (70392537)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥2,910,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥210,000)
Fiscal Year 2007: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2006: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2005: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Keywords | Stratigraphy-Paleontology / Fossil flora / Paleoclimate / Oligocene / Miocene / Paleogeography / Japan Sea origin |
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| Research Abstract |
Oligocene to Early Miocene floras prior to the tectonic episode of the Japan Sea opening are studied in their compositional and chronostratigraphical changes, together with paleoclimatic analysis of these floras based on leaf physiognomic characters. Field surveys and fossil collections are made in Akita, Fukushima, Gifu, Inland region and northern Kyushu, in addition of re-examination of plant megafossil collections and three radiometric datings in Fukushima area. Brief results are as follows:
1) "Oligocene" floras are divided into two types, Late Eocene to Early Oligocene and Late Oligocne floras. Although climatic fluctuation are evident in each floral type, these floras represent a modernized, warm-temperate flora since the Middle Eocene thermal maximum.
2) Early Miocene floras are divided into the older, temperate Aniai-type and younger, warmer Daijima-type floras. The shift from the Aniai-type to Daijima-type occurs ca. 20 Ma. Among the Daijima-type floras, those in 20 Ma to 17 Ma are characterized by Fagus and many other deciduous dicots, accompanied by many deciduous elements of Daijima type, such as Comptonia, Liquidambar, Parrotia and Quercus miovariabilis, differing the typical Daijima-type around 16 Ma.
3) Latitudinal and longitudinal (from inland to maritime areas) change in each Early Miocene flora is analyzed on the basis of the floral composition and leaf physiognomic character. Apart from latitudinal changes in the Aniai-and Daijima-type floras, the longitudinal change is apparent in the Aniai-type floras. The evidence reveals the paleogeographic changes prior to the tectonic episode of the opening of the Japan Sea in ca. 16 Ma.
4) Although these floral and climatic shifts involve the local tectonic episode, they also represent a global paleoclimatic evolution.
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Report
(4 results)
Research Products
(27 results)
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[Journal Article] Middle Miocene plants from marine sediments in Tatsugoroshi of Hitachiota, Ibaraki Prefecture, Japan.2006
Author(s)
Umeura, K., Kikuchi, Y., Natago, H., Nikaido, A.
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Journal Title
Bulletin of the National Science Museum, Tokyo 32
Pages: 1-11
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[Presentation] 秋田県阿仁合地域新第三系の植物化石2007
Author(s)
廣部嘉祥・小笠原件四郎・植村和彦・鹿野和彦
Organizer
日本古生物学会第156回例会
Place of Presentation
徳島
Year and Date
2007-02-03
Description
「研究成果報告書概要(和文)」より
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[Book] 日本列島の自然史2006
Author(s)
植村和彦ほか(編)
Total Pages
339
Publisher
東海大学出版会
Description
「研究成果報告書概要(和文)」より
Related Report
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