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Faculty of Education Science education |
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KUMA Ryusei
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Degree 【 display / non-display 】
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博士（理学） ( 2021.3 名古屋大学 )
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修士（理学） ( 2018.3 名古屋大学 )
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学士（理学） ( 2016.3 九州大学 )
Research Interests 【 display / non-display 】
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炭酸塩コンクリーション
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湖成層
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温室期の地球環境
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化石化プロセス
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チャート
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シリカコンクリーション
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化石
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コンクリーション
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堆積学
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古気候学
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古環境学
Research Areas 【 display / non-display 】
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Natural Science / Solid earth sciences
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Natural Science / Biogeosciences
Education 【 display / non-display 】
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Nagoya University
- 2021.3
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Nagoya University
- 2018.3
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Kyushu University
- 2016.3
External Career 【 display / non-display 】
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Nihon University Research Assistant
2023.4 - 2024.3
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Waseda University
2022.4 - 2022.9
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Nagoya University Researcher
2021.4 - 2023.3
Papers 【 display / non-display 】
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Ammonite concretion formation through organic decomposition in the iron reduction zone Reviewed
Yusuke Muramiya, Hidekazu Yoshida, Nagayoshi Katsuta, Ryusei Kuma, Tomoyuki Mikami
Journal of Sedimentary Research 2023.11
Publishing type：Research paper (scientific journal) Publisher：Society for Sedimentary Geology
The ammonites in spherical carbonate concretions often preserve their original three-dimensional (3D) shell shapes and detailed fragile structures. However, the formation process of spherical ammonite concretion is not fully understood. Herein, the ammonite concretions identified in the Cretaceous (Campanian) Osoushinai Formation, Yezo Group, Japan, are examined to understand their formation process during the soft tissue decomposition after burial in marine sediments. In the Osoushinai Formation, almost all observed ammonites in concretions preserve their 3D form without phragmocone deformation. The calcite filling in the remaining body chamber of ammonites (BC1) shows that shells were buried with soft tissues. These occurrences, negative delta13C values, and the near-zero delta18O values of BC1 as well as the concretions indicate that both BC1 and concretions rapidly formed from dissolved inorganic carbon derived from organic matter, including the soft tissue of dead organisms, in the shallow part of the sediments. The increasing Fe concentration in BC1 shows that BC1 formed in the iron reduction (FeR) zone, where organic matter was decomposed owing to the activity of iron-reducing microorganisms. The similarity of the elemental and isotopic compositions of BC1 and concretions show that they concurrently formed in the FeR zone. In the Osoushinai Formation, an abundant influx of Fe(III) and intense bioturbation during the deposition of the formation promoted organic decomposition in the FeR zone, causing rapid formation of BC1 and concretions. Such rapidly formed calcite fillings and concretions protected fossils from deformation and dissolution during diagenesis to preserve their 3D form. Overall, the findings of this study provide a new insight into the relation between sedimentary environments and the fossil preservation process via rapid concretion formation.
DOI： 10.2110/jsr.2023.078
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愛知県南知多町先苅貝塚における貝形虫化石 Reviewed
佐々木聡史, 隈隆成
名古屋大学年代測定研究 7 32 - 35 2023.3
Publishing type：Research paper (scientific journal)
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Large ammonoid shellbed and huge calcareous concretion bed in shallow-marine fine sandstone of the lower Coniacian Ashizawa Formation, Futaba Group, Northeast Japan Reviewed
Omori Hikaru, Ando Hisao, Muramiya Yusuke, Utagawa Fumiaki, Kuma Ryusei, Yoshida Hidekazu
The Journal of the Geological Society of Japan 129 ( 1 ) 105 - 124 2023.2
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Geological Society of Japan
A bed containing large ammonoids (mostly <i>Mesopuzosia yubarensis</i>, 40-60 cm in diameter) and an underlying bed containing huge calcareous concretions in the middle part of the Obisagawa Member (lower Coniacian), Ashizawa Formation, Futaba Group, are exposed in the Iwaki City Ammonite Center. This study investigated these beds to reconstruct their formation on the basis of sedimentary facies and taphonomy, as well as geochemical analyses of the concretions, including major elements, mineral components, and carbon and oxygen isotopic compositions. Numerous shells of <i>M. yubarensis</i> lacking soft tissues may have been transported into the littoral region through postmortem drift from the initial offshore habitat. Subsequently, these shells were partially destroyed (especially body chambers and umbilical whorls), sorted in size, accumulated, and transported offshore by a series of storm waves and storm-induced currents. Finally, the remains were scattered on mounds of hummocky cross-stratification and rapidly buried within amalgamated hummocky cross-stratified very fine sandstone on the offshore side of a lower-shoreface sedimentary environment. Abundant calcareous concretions of 15-194 cm in diameter and with prolate to oblate spheroid shapes are densely and uniformly distributed under the ammonoid bed. Considering the spatial positioning of the ammonoid shells and concretions within the beds, and isotopic values of δ<sup>13</sup>C = −6‰ to −1‰ and δ<sup>18</sup>O = −11‰ to −6‰ for 21 concretion samples, the concretions are interpreted to have begun to form in association with the decomposition of organic matter that had accumulated under the influence of storm waves and storm-induced currents, and carcasses of prolific meiobenthos organisms within shallow substrata. Subsequently, the concretions were buried more deeply and enlarged through further filling of calcium carbonate involving bicarbonate ions generated by the methanogenetic decomposition of organic matter.
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The formation conditions of gigantic dolomite concretions including whale bones exposed in Unosaki coast, Oga peninsula, Japan Reviewed
Kuma Ryusei, Nishimoto Shoji, Muramiya Yusuke, Yoshida Hidekazu
The Journal of the Geological Society of Japan 129 ( 1 ) 145 - 151 2023.2
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Geological Society of Japan
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Hitoshi Hasegawa, Nagayoshi Katsuta, Yasushi Muraki, Ulrich Heimhofer, Niiden Ichinnorov, Hirofumi Asahi, Hisao Ando, Koshi Yamamoto, Masafumi Murayama, Tohru Ohta, Masanobu Yamamoto, Masayuki Ikeda, Kohki Ishikawa, Ryusei Kuma, Takashi Hasegawa, Noriko Hasebe, Shoji Nishimoto, Koichi Yamaguchi, Fumio Abe, Ryuji Tada, Takeshi Nakagawa
Scientific Reports 12 ( 1 ) 2022.12
Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC
Abstract
Understanding climate variability and stability under extremely warm ‘greenhouse’ conditions in the past is essential for future climate predictions. However, information on millennial-scale (and shorter) climate variability during such periods is scarce, owing to a lack of suitable high-resolution, deep-time archives. Here we present a continuous record of decadal- to orbital-scale continental climate variability from annually laminated lacustrine deposits formed during the late Early Cretaceous (123–120 Ma: late Barremian–early Aptian) in southeastern Mongolia. Inter-annual changes in lake algal productivity for a 1091-year interval reveal a pronounced solar influence on decadal- to centennial-scale climatic variations (including the ~ 11-year Schwabe cycle). Decadally-resolved Ca/Ti ratios (proxy for evaporation/precipitation changes) for a ~ 355-kyr long interval further indicate millennial-scale (~ 1000–2000-yr) extreme drought events in inner-continental areas of mid-latitude palaeo-Asia during the Cretaceous. Millennial-scale oscillations in Ca/Ti ratio show distinct amplitude modulation (AM) induced by the precession, obliquity and short eccentricity cycles. Similar millennial-scale AM by Milankovitch cycle band was also previously observed in the abrupt climatic oscillations (known as Dansgaard–Oeschger events) in the ‘intermediate glacial’ state of the late Pleistocene, and in their potential analogues in the Jurassic ‘greenhouse’. Our findings indicate that external solar activity forcing was effective on decadal–centennial timescales, whilst the millennial-scale variations were likely amplified by internal process such as changes in deep-water formation strength, even during the Cretaceous ‘greenhouse’ period.DOI： 10.1038/s41598-022-25815-w
Other Link： https://www.nature.com/articles/s41598-022-25815-w
Presentations 【 display / non-display 】
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Paleomagnetic stratigraphy of the Eocene lacustrine deposits (Green River Fm) in Utah for reconstructing the terrestrial environment changes in the Eocene “hothouse” period (Preliminary results)
2025.3
Event date： 2025.3
Presentation type：Oral presentation (general)
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始新世“温室期”の陸域気候復元に向けたグリーンリバー湖成層の古地磁気層序の構築
松本裕貴，穴井千里，長谷川精，佐久間杏樹，泉奏，隈隆成
日本地質学会中国支部会 2024.12
Event date： 2024.12
Presentation type：Oral presentation (general)
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メゾンクリークの菱鉄鉱質コンクリーション群におけるコンクリーション中の炭素量と化石サイズの関係
村宮悠介, 三上智之, 吉田英一, 勝田長貴, 隈 隆成
日本古生物学会第172回例会 2023.2
Event date： 2023.2
Presentation type：Poster presentation
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Ammonite concretion formation in the iron reduction zone during early diagenesis
村宮悠介, 吉田英一, 勝田長貴, 隈隆成, 三上智之
日本地質学会学術大会(Web) 2023
Event date： 2023
Presentation type：Oral presentation (general)
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Unraveling the formation process of Holocene carbonate concretions through <sup>14</sup>C analysis.
南雅代, 隈隆成, 吉田英一
日本地球化学会年会要旨集(Web) 2023
Event date： 2023
Presentation type：Poster presentation
Awards 【 display / non-display 】
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最優秀発表賞
2021.3 令和2年度高知大学海洋コア総合研究センター共同利用・共同研究成果発表会 米国グリーンリバー湖成層に記録された始新世前期～中期“温室期”の古環境変動
隈隆成, 長谷川精, 大島有希子, 石川航輝
Award type：International academic award (Japan or overseas)
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学生優秀発表賞
2019.5 日本地球惑星科学連合大会2019年 米国グリーンリバー層に見られる湖成チャートの堆積リズムと湖生物生産との関係性
隈隆成, 長谷川精, 山本鋼志, 吉田英一, 池田昌之, 勝田長貴, Whiteside J.
Award type：Award from Japanese society, conference, symposium, etc.
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最優秀講演賞（SSJ Best Talk Award）
2018 日本堆積学会秋田大会 「北米グリーンリバー湖成層に見られるチャート層の成因と始新世前期“温室期”の湖生物生産量変動」
隈隆成, 長谷川精, 山本鋼志
Award type：Award from Japanese society, conference, symposium, etc.
Grant-in-Aid for Scientific Research 【 display / non-display 】
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Deciphering climate variability in the Early Eocene "hothouse" beyond the tipping point from annually laminated lacustrine record in Utah, USA
Grant number：23KK0193 2023.09 - 2026.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (International Collaborative Research)
Authorship：Coinvestigator(s)
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生物起源炭酸塩コンクリーションの初期続成メカニズムの解明
Grant number：21K20381 2021.08 - 2023.03
日本学術振興会 科学研究費助成事業 研究活動スタート支援 研究活動スタート支援
隈 隆成
Authorship：Principal investigator
これまでに名古屋港海底未固結堆積泥中から産出したウニ，カニ，貝などを核として形成された炭酸塩コンクリーションを対象に，顕微鏡観察，X線を用いた元素マッピングを行った．また，コンクリーション外殻部・内殻部・化石本体部に分けて，安定炭素同位体比分析，元素組成分析，鉱物組成分析，放射性炭素年代測定を行い，炭酸塩コンクリーションの成因とコンクリーションの形成年代を検討した．産状として，名古屋港のコンクリーションはサイズが数mm～数cmであった．また，コンクリーションは沖積層から産出しており，未固結な堆積物中で形成されたと考えられる．特にカニ類は，骨格が維持されていることから，死後，急速にコンクリーション化したことが示唆された．
顕微鏡観察及び元素マッピングの結果，すべてのコンクリーション部に，1 mm程度のペレットが観察された．主要鉱物組成はドロマイトであり，ドロマイトが沈殿するような嫌気的な堆積環境下でコンクリーションが形成されたことが示唆された．安定炭素同位体比は，化石本体部よりコンクリーション部の方が重い値を示し，放射性炭素年代はおおよそ8000年前という結果が得られたが，総じて化石本体部よりコンクリーション部の方が数百年ほど古い値を示した．これは，コンクリーション部には，ペレットともに土壌有機物に由来する古い炭素が含まれているからだと考えられる．約8000年前は縄文海進の時期に相当し，浅海域に生息していた生物が環境変化によって死滅し，化石化したと考えられる． -
Grant number：16K21095 2016.04 - 2018.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B) Grant-in-Aid for Young Scientists (B)
Hasegawa Hitoshi, KUMA Ryusei
Authorship：Principal investigator
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.
Social Activities 【 display / non-display 】
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令和６年度 第１１回 宮崎県高等学校課題研究発表大会 審査委員
宮崎県教育委員会 2025.3.13
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みやだいwakuwaku体験「何が出るかな？化石発掘体験！」
Role(s)： Lecturer, Advisor, Planner, Demonstrator
宮崎大学 大学開放事業 2024.11.16
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宮崎県サイエンスコンクール・プレゼンテーション審査委員長（小学生の部）
翔け！未来の科学者育成推進委員会 2024.11.9
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宮崎県サイエンスコンクール中央審査 審査委員長（小学生の部）
翔け！未来の科学者育成推進委員会 2024.10.8
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宮崎県立都城泉ヶ丘高等学校附属中学校「総合的な学習の時間」における出前授業
Role(s)： Lecturer
宮崎県立都城泉ヶ丘高等学校附属中学校 2024.7.10