Pliocene Antarctic bottom water: Implications from reworked diatoms and preservation

• Project/Area Number: 25550015
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis
• Research Institution: Kochi University
• Principal Investigator: IWAI MASAO 高知大学, 自然科学系, 教授 (90274357)
• Research Collaborator: KOBAYASHI Munemasa 高知大学, 大学院総合人間自然科学研究科理学専攻
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 東南極氷床 / 鮮新世温暖期 / 珪藻 / ウィルクスランド / 国際情報交換 / 欧州（英国・スペイン） / 米国 / IODP Exp.318

Outline of Final Research Achievements

We examined diatoms from IODP Site U1361 from continental rise off Wilkes Land, Antarctica, to assess the stability of the East Antarctic Ice Sheet (EAIS) and the Antarctic bottom water (AABW) history during the warm Pliocene. Reworked Miocene diatoms in Pliocene section without any recycling in Quaternary sediment in study area suggests the dynamic behaviour of the EAIS as well as Ne isotope and AMS analysis. In addition, increasing of reworked diatoms in clay rich intervals suggest increasing AABW production during warm Pliocene glacial stages.

Research Products

• [Journal Article] Geology of the Wilkes Land Sub-basin and stability of the East Antarctic Ice Sheet: Insights from rock magnetism at IODP Site U1361. (2015)
  • Author(s): Tauxe, L., sugisaki, S., Jimenez-Espejo, F., Cook, C.P., van de Flierdt, T., Iwai, M., and Escutia, C.
  • Journal Title: Earth and Planetary Science Letters Volume: 412 Pages: 61-69
  • DOI: 10.1016/j.epsl.2014.12.034
  • Peer Reviewed / Open Access
• [Journal Article] Repeated advance and retreat of the East Antarctic Ice Sheet on the continental shelf during the early Pliocene warm period. (2015)
  • Author(s): Reinardy B.T.I., Escutia C., Iwai, M., Jimenez-Espejo F.J., Cook C., van de Flierdt T. and Brinkhuis, H.
  • Journal Title: Palaeogeography, Palaeoclimatology, Palaeoecology Volume: 422 Pages: 65-84
  • DOI: 10.1016/j.palaeo.2015.01.009
  • Peer Reviewed / Open Access
• [Journal Article] 新生代東南極氷床発達史：Exp.318ウィルクスランド航海 (2014)
  • Author(s): 岩井雅夫・香月興太・杉崎彩子・山根雅子・酒井豊三郎・Francisco. J. Jimenez Espejo・Exp..318 Scientists
  • Journal Title: 月刊地球 Volume: 号外No.64 Pages: 111-118
  • Acknowledgement Compliant
• [Journal Article] Orbital forcing of the East Antarctic ice sheet during the Pliocene and Early Pleistocene. (2014)
  • Author(s): Patterson,M. O., McKay,R., Naish, T., Escutia, C., Jimenez-Espejo, F.J., Raymo,M. E., Meyers,S. R., Tauxe, L. H. Brinkhuis& IODP Expedition 318 Scientists (including Iwai, M.)
  • Journal Title: Nature Geoscience Volume: 7 (11) Issue: 11 Pages: 841-847
  • DOI: 10.1038/ngeo2273
  • Peer Reviewed
• [Journal Article] Dynamic Behaviour of the East Antarctic Ice Sheet during Pliocene Warmth (2013)
  • Author(s): Cook, C., van de Flierdt, T., Williams, T., Hemming, S.R., Iwai, M., Kobayashi, M., Jimenez-Espejo, F.J., Escutia, C., Gonzalez, J.J., Khim, B.-K., McKay, R.M., Passchier, S., Bohaty, S.M., Riesselman, C.R., Tauxe, L., Sugisaki, S., Galindo, A.L., Patterson, M.O., Sangiorgi, F., Pierce, E.L., Brinkhuis, H., and IODP Expedition 318 Scientists
  • Journal Title: Nature Geoscience Volume: 6 Issue: 9 Pages: 765-769
  • DOI: 10.1038/ngeo1889
  • Peer Reviewed
• [Journal Article] Provenance of Pleistocene sediments from Site U1359 of the Wilkes Land IODP Leg 318 - evidence for multiple sourcing from the East Antarctic Craton and Ross Orogen (2013)
  • Author(s): Pant, N. C., Biswas, P., Shrivastava, P.K., Bhattacharya, S., Verma, K., Pandey, M., and IODP Expedition 318 Scientific Party
  • Journal Title: The Geological Society of London 2013, Geological Society, London, Special Publications Volume: 381 Issue: 1 Pages: 277-297
  • DOI: 10.1144/sp381.11
  • Peer Reviewed
• [Presentation] 東南極氷床の安定性：ウィルクスランド航海Exp.318の成果 (2015)
  • Author(s): 岩井雅夫・Exp.318乗船研究者
  • Organizer: 第5回掘削科学シンポジウム
  • Place of Presentation: 高知大学（高知県高知市）
  • Year and Date: 2015-03-18
• [Presentation] Geology of the Wilkes Land Sub-basin and Stability of the East Antarctic Ice Sheet: Insights from rock magnetism at IODP Site U1361. (2014)
  • Author(s): Tauxe, L., sugisaki, S., Jimenez-Espejo, F., Cook, C.P., van de Flierdt, T., Iwai, M., and Escutia, C.
  • Organizer: AGU Fall Meeting 2014
  • Place of Presentation: San Francisco (America)
  • Year and Date: 2014-12-15 – 2014-12-19
• [Presentation] 鮮新世温暖期の南極氷床と南大洋：陸棚縁辺深海掘削の成果 (2013)
  • Author(s): 岩井雅夫・小林宗誠・香月幸太・杉崎彩子・山根雅子・酒井豊三郎・IODP Exp.318 Scientists
  • Organizer: 国立極地研究所研究集会「南極海海洋循環を軸とした研究の新展開」
  • Place of Presentation: 国立極地研究所（東京）
• [Presentation] 南大洋珪藻化石層序：氷上掘削と深海掘削をつなぐ上での期待と課題
  • Author(s): 岩井雅夫
  • Organizer: 極地研究所研究集会「ANDRILL参加に向けた国内準備集会」
  • Place of Presentation: 国立極地研究所（東京）
• [Presentation] 再堆積・リサイクル化石の判別とその古海洋学的意義：IODP Site U1361の珪藻化石を例に
  • Author(s): 岩井雅夫・小林宗誠
  • Organizer: 第４回 掘削コア科学シンポジウム
  • Place of Presentation: 高知大学海洋コア総合研究センター
• [Presentation] Diatom age assignment at IODP Site U1358 on the continental shelf off the Adelie Coast, Antarctica
  • Author(s): Iwai, M., Reinardy, B., Escutia, C., and IODP Expedition 318 Scientists
  • Organizer: EGU General Assembly 2014
  • Place of Presentation: Austria Center Vienna (ACV) in Vienna, Austria
• [Presentation] Investigating the dynamics of the East Antarctic Ice Sheet on the continental shelf off the Adelie Coast during the Pliocene
  • Author(s): Reinardy, B., Escutia, C., Iwai, M., Jimenez-Espejo, F., Cook, C., van de Flierdt, T., and Brinkhuis, H.
  • Organizer: EGU General Assembly 2014
  • Place of Presentation: Austria Center Vienna (ACV) in Vienna, Austria