Reconstruction of annually-resolving climatic changes during the mid-Cretaceous and early Eocene "greenhouse" periods
Project/Area Number |
16K21095
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Multi-year Fund |
Research Field |
Geology
Stratigraphy/Paleontology
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Research Institution | Kochi University (2017) Nagoya University (2016) |
Principal Investigator |
Hasegawa Hitoshi 高知大学, 教育研究部自然科学系理学部門, 講師 (80551605)
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Research Collaborator |
KUMA Ryusei 名古屋大学, 環境学研究科
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Project Period (FY) |
2016-04-01 – 2018-03-31
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Project Status |
Completed (Fiscal Year 2017)
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Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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Keywords | 年縞 / 白亜紀 / 始新世 / 温室期 / 気候変動 / 湖成層 / 太陽活動 / 古気候学 |
Outline of Final Research Achievements |
In order to reconstruct annual- to orbital-scale paleoclimatic changes in the mid-Cretaceous and early Eocene “greenhouse” periods, the present study examined two of lacustrine varve records of the Shinekhudag Formation in Mongolia and the Green River Formation in Utah, USA. Based on annually-resolving analyses of lake algal productivity and decadally-resolving analysis of precipitation proxy from the Shinekhudag Formation, we found that solar influence of decadal- to millennial-scale climatic oscillations (ca. 11, 90-125, 210-240, 400-500, 1000-1450, 2000-2300 years cycle) were existed during the mid-Cretaceous “greenhouse” period. Based on the sedimentary facies analysis and major and minor elemental composition analysis from the Green River Formation, we found that the lake productivity changes were controlled by orbital insolation changes during the early Eocene “greenhouse” period.
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Report
(3 results)
Research Products
(21 results)
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[Journal Article] Depositional ages and characteristics of Middle-Upper Jurassic and Lower Cretaceous lacustrine deposits in southeastern Mongolia2018
Author(s)
Hasegawa H., Ando H., Hasebe N., Ichinnorov N., Ohta T., Hasegawa T., Yamamoto M., Li G., Erdenetsogt, B., Heimhofer U., Murata T., Shinya H., Enerel G., Oyunjargal G., Munkhtsetseg O., Suzuki N., Irino T., Yamamoto K.
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Journal Title
Island Arc
Volume: 27
Issue: 3
Pages: 1-17
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] モンゴルの年縞湖成層から読み解く白亜紀中期“超温室期”の十年~千年周期の気候変動と太陽活動の気候影響2018
Author(s)
長谷川精, 安藤寿男, 勝田長貴, 村木綏, Ichinnorov N., 村山雅史, 山本鋼志, 太田亨, 長谷川卓, 山本正伸, 長谷部徳子, Heimhofer U., 池田昌之, 西本昌司, 山口浩一, 阿部文雄, 多田隆治
Organizer
日本地球惑星科学連合2018年大会
Related Report
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[Presentation] モンゴル湖成層から読み解く白亜紀中期“超温室期”の十年スケール~地球軌道要素スケールの気候システム変動2016
Author(s)
長谷川精,,山本鋼志,勝田長貴,三村耕一, 安藤寿男, 太田亨, 山本正伸, 長谷川卓, 長谷部徳子, Ichinnorov N., Heimhofer U., Enerel G., Oyunjargal G., 西本昌司, 山口浩一, 鈴木徳行, 入野智久, 阿部文雄, 村木綏
Organizer
日本地球惑星科学連合2016年大会
Place of Presentation
幕張メッセ
Related Report
Invited
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