Reconstruction of paleoinsolation and paleoenvironmental changes during the Middle Holocene

• Project/Area Number: 26887005
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Stratigraphy/Paleontology
• Research Institution: Tohoku University
• Principal Investigator: Takayanagi Hideko 東北大学, 理学(系)研究科(研究院), 助教 (40729208)
• Project Period (FY): 2014-08-29 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: シャコガイ / 炭素同位体比 / 酸素同位体比 / 微量金属元素濃度 / 日射量変化 / 炭素・酸素同位体比 / 微量元素濃度 / 中期完新世 / 琉球列島

Outline of Final Research Achievements

The sclerochronology and geochemistry of a giant clam Tridacna gigas shell collected from the South Ryukyus, Japan has been investigated for reconstructing paleoinsolation and paleoenvironmental changes during the Middle Holocene. Black and light growth bands were clearly confirmed in the T. gigs shell. Since growth variation in the Tridacna shell showed the seasonality, we inferred that such growth bands are probably daily increments. Oxygen isotope composition of the Tridacna shell showed secular changes in sea surface temperature (SST) during the Middle Holocene. Seasonal amplitude of the SST in the Middle Holocene was close to that of recent SST variation. The oxygen isotope profile indicate long-lasting warming during the Middle Holocene.

Research Products

• [Journal Article] Carbonate sedimentationin seagrass beds in Ishigaki-jima, Ryukyu Islands, southwestern Japan (2015)
  • Author(s): Fujita, K., Asami, R., Takayanagi, H., and Iryu, Y
  • Journal Title: Island Arc Volume: 印刷中
  • Peer Reviewed
• [Journal Article] Reply to the comment by Granier on ‘‘Early Aptian paleoenvironmental evolution of the Bab Basin at the southern Neo-Tethys margin: Response to global carbon-cycle perturbations across Ocean Anoxic Event 1a’’. (2014)
  • Author(s): Yamamoto, K., Ishibashi, M., Takayanagi, H., Asahara, Y., Sato, T., Nishi, H. and Iryu, Y.
  • Journal Title: Geochemistry, Geophysics, Geosystems Volume: 15 Issue: 5 Pages: 2091-2094
  • DOI: 10.1002/2014gc005390
  • Peer Reviewed
• [Presentation] Origin and Development of a stratiform dolomite in Barremian oil field carbonates, offshore Abu Dhabi, United Arab Emirates (2015)
  • Author(s): Yamamoto, K., Ottinger, G., Al-Zinati, O., Takayanagi, H., Yamamoto, K., and Iryu, Y.
  • Organizer: AAPG Anual Convention & Exhibition 2015
  • Place of Presentation: Denver, Colorado
  • Year and Date: 2015-05-31 – 2015-06-03
• [Presentation] 喜界島の上部更新統より産するKikaithyris hanzawaiの炭素・酸素同位体組成および微量金属濃度の個体差 (2015)
  • Author(s): 滝澤護・髙栁栄子・山本鋼志・佐々木圭一・井龍康文
  • Organizer: 日本地球惑星科学連合連合大会2015年大会
  • Place of Presentation: 幕張
  • Year and Date: 2015-05-24 – 2015-05-28
• [Presentation] Within- and inter-shell variations in carbon and oxygen isotope composition of modern brachiopods (2015)
  • Author(s): Takayanagi, H., Asami, R., Otake, T., Abe, O., Miyajima, T., Sasaki, K., Kitagawa, H., and Iryu, Y.
  • Organizer: The 7th International Brachiopod Congress
  • Place of Presentation: Nanjing, China
  • Year and Date: 2015-05-22 – 2015-05-25
• [Presentation] 喜界島湾層産のKikaithyris hanzawai（約70 ka）の炭素・酸素同位体組成による古海洋環境復元 (2015)
  • Author(s): 滝澤 護・高柳栄子・山本鋼志・佐々木圭一・井龍康文
  • Organizer: 日本地質学会東北支部2014年度総会
  • Place of Presentation: 盛岡
  • Year and Date: 2015-03-07 – 2015-03-08
• [Presentation] 「カンブリア紀の農耕革命」はエディアカラ紀に始まっていた (2015)
  • Author(s): 大路樹生・Stephen Q. Dornbos・矢田圭吾・長谷川精・Sersmaa Gonchigdorj・望月貴史・高柳栄子・井龍康文
  • Organizer: 日本古生物学会第164回例会
  • Place of Presentation: 豊橋
  • Year and Date: 2015-01-30 – 2015-02-01
• [Presentation] 腕足動物の同位体記録を歪める原因 (2015)
  • Author(s): 高柳栄子・浅海竜司・大竹二雄・阿部 理・宮島利宏・北川浩之・井龍康文
  • Organizer: 日本古生物学会第164回例会
  • Place of Presentation: 豊橋
  • Year and Date: 2015-01-30 – 2015-02-01
• [Presentation] 石垣島の現生サンゴ骨格から復元された過去約500年間の海洋環境変動 (2015)
  • Author(s): 福留綾里紗・浅海竜司・阿部理・高柳栄子・平井 彰・井龍康文
  • Organizer: 日本古生物学会第164回例会
  • Place of Presentation: 豊橋
  • Year and Date: 2015-01-30 – 2015-02-01
• [Presentation] 鉄同位体を利用した古海洋環境復元の試み (2014)
  • Author(s): 田中啓・安田友紀・鈴木和博・久保貴志・申 基澈・高柳栄子・井龍康文・淺原良浩
  • Organizer: 第4回同位体環境学シンポジウム
  • Place of Presentation: 京都
  • Year and Date: 2014-12-22
• [Presentation] アラビア湾南岸地域におけるアプチアン階石油根源岩の形成要因と海洋無酸素事変（OAE1a）との関連性 (2014)
  • Author(s): 山本和幸・石橋正敏・高柳栄子・浅原良浩・佐藤時幸・西 弘嗣・井龍康文
  • Organizer: 日本地質学会第121年学術大会
  • Place of Presentation: 鹿児島
  • Year and Date: 2014-09-14 – 2014-09-16
• [Presentation] 琉球列島多良間島に分布する琉球層群の層序および年代 (2014)
  • Author(s): 大関 萌・今井 遼・高柳栄子・井龍康文
  • Organizer: 日本地質学会第121年学術大会
  • Place of Presentation: 鹿児島
  • Year and Date: 2014-09-14 – 2014-09-16
• [Presentation] Preservation of ichnocoenosis in present-day macroid, algal nodule and rhodolith beds (S. Japan, E. Australia, S. Spain): Palaeoecological inferences (2014)
  • Author(s): Bassi, D., Braga, J. C., Iryu, Y., and Takayanagi, H.
  • Organizer: The 7th International Meeting on Taphonomy and Fossilization
  • Place of Presentation: Ferara, Italy
  • Year and Date: 2014-09-10 – 2014-09-13