2013 Fiscal Year Final Research Report
Precise reconstruction of variation in paleovegetation during Cretaceous hot period by analyses of terrestrial plant-derived organic molecules in sediments
| Project/Area Number |
23540542
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | Hokkaido University |
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Principal Investigator |
SAWADA Ken 北海道大学, 理学(系)研究科(研究院), 准教授 (20333594)
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| Co-Investigator(Kenkyū-buntansha) |
TAKASHIMA Reishi 東北大学, 学術資源研究公開センター, 准教授 (00374207)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 古植生解析 / 陸域環境変動 / 植物バイオマーカー / ケロジェン / 抵抗性高分子 / 白亜紀 / 植物化石 / 熱化学分解分析 |
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| Research Abstract |
The objective of this study is to reconstruct long time scale variations in paleovegetation and terrestrial paleoenvironment by analyses of terrestrial plant-derived biomarkers and kerogens in sedimentary rocks from the Cretaceous Yezo Group, Hokkaido, Japan. In particular, we found rapid changes in angiosperm / gymnosperm vegetation ratio and coniferous vegetation evaluated by analysis of terrestrial plant terpenoid biomarkers. Moreover, we suggest that composition of long chain n-alkanols released from resistant macromolecule in kerogen can be useful as an indicator of deciduous broad leaf plant vegetation. Variation in the paleovegetation using the long chain n-alkanols released from kerogen is almost synchronous to that in angiosperm / gymnosperm vegetation using terrestrial plant biomarkers, confirming high applicability of the released n-alkanol proxy for reconstructing paleovegetation from ancient sediment.
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