Sr isotope variation of Permian seawater

• Project/Area Number: 25400490
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geology
• Research Institution: Kumamoto University
• Principal Investigator: Kani Tomomi 熊本大学, 自然科学研究科, 助教 (60332863)
• Co-Investigator(Renkei-kenkyūsha): ISOZAKI Yukio 東京大学, 総合文化研究科, 教授 (90144914)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2013: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: ペルム紀 / ストロンチウム同位体 / 古海洋 / 大量絶滅 / 石灰岩 / 海洋 / 炭酸塩 / 炭酸塩岩

Outline of Final Research Achievements

The Permian minimum as the Phanerozoic lowest value of seawater Sr isotope ratio by and large contemporaneous with the major mass extinction around Middle/Late Permian boundary. We newly reported the continuous Sr isotope record with detailed biostratigraphic data for the Guadalupian (Middle Permian) carbonates deposited at mid-paleolatitude region. Previous geochemical studies are carried out for around low-latitudes because well-reserved strata deposited at particularly middle/high paleolatitude region are limited. The Sr isotope profile of carbonates obtained in this study clarified that the Permian minimum (ca. 5 m.y.-long) had began sometime in Guadalupian Wordian and the collapsed age of a mid-latitude reef is Guadalupian Capitanian. The Permian minimum could be caused by global cooling because the proportion of glacier-covered area regulate erosion/weathering rate of time-integrated highly radiogenic continental silicate. The mass extinction event may arise from the cooling.

Research Products

• [Int'l Joint Research] Russian Academy of Sciences(ロシア連邦)
• [Journal Article] The Capitanian minimum of 87^Sr/86^Sr ratio in the Permian mid-Panthalassan paleo-atoll carbonates and its demise by the deglaciation and continental doming (2013)
  • Author(s): Kani, T., Hisanabe, C, Isozaki, Y.
  • Journal Title: Gondwana Reserach Volume: 24 Issue: 1 Pages: 212-221
  • DOI: 10.1016/j.gr.2012.08.025
  • Peer Reviewed
• [Presentation] Guadalupian (Middle Permian) Sr isotope profile and reef collapse in low/mid-lattitude shelf carbonates in NE Japan and Primorye (Russia) (2016)
  • Author(s): TOMOMI KANI, YUKIO ISOZAKI and YURI ZAKHAROV
  • Organizer: Goldschmidt conference
  • Place of Presentation: 神奈川県，横浜 横浜国際平和会議場
  • Year and Date: 2016-06-25
  • Int'l Joint Research
• [Presentation] The collapse of a Capitanian (Middle Permian) reef: Sr-isotope profile at Iwaizaki, NE Japan (2015)
  • Author(s): 可児智美 磯崎行雄 林隆太郎
  • Organizer: 日本地球惑星科学連合
  • Place of Presentation: 千葉県幕張
  • Year and Date: 2015-05-24 – 2015-05-27
• [Presentation] ペルム紀中期末における陸棚礁の崩壊:北上山地岩井崎石灰岩の Sr 同位体層序 (2015)
  • Author(s): 可児智美, 磯崎行雄, 林隆太郎
  • Organizer: 日本地球惑星科学連合連合大会
  • Place of Presentation: 千葉県，幕張 幕張メッセ
  • Year and Date: 2015-05-24
• [Presentation] ペルム紀中期末の生相・環境変化:中緯度での応答 (2015)
  • Author(s): 磯崎行雄, 可児智美, 林隆太郎
  • Organizer: 日本地球惑星科学連合連合大会
  • Place of Presentation: 千葉県，幕張 幕張メッセ
  • Year and Date: 2015-05-24
• [Presentation] A remarkable sea-level drop and global cooling in the late Middle Permian: record from the mid-superoceanic limestone (2014)
  • Author(s): KOFUKUDA, Daisuke ISOZAKI, Yukio IGO, Hisayoshi KANI, Tomomi ISHIMURA, Toyoho
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 神奈川横浜
• [Presentation] Middle to Late Permian seawater Sr isotope variation linked to the glaciation/deglaciation (2014)
  • Author(s): KANI, Tomomi KOFUKUDA, Daisuke ISOZAKI, Yukio
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 神奈川横浜
• [Presentation] ガダルピアン世（ペルム紀）の海水Sr同位体ミニマム (2013)
  • Author(s): 可児 智美 磯崎行雄 小福田大輔 蓋盛拓海 久鍋千尋
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 千葉県幕張
• [Presentation] 南中国四川省中部の中部ペルム系石灰岩の岩相・生・C-Sr同位体層序 (2013)
  • Author(s): 蓋盛 拓海 磯崎 行雄 可児 智美 鈴木 淳 石村 豊穂
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 千葉県幕張
• [Presentation] パンサラサ海中央部の海山起源ペルム紀石灰岩の岩相・生・C-Sr同位体層序 (2013)
  • Author(s): 西田 昴広 磯崎 行雄 可児 智美 鈴木 淳 石村 豊穂
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 千葉県幕張
• [Presentation] 超海洋中央部起源の石灰岩におけるG-L境界大量絶滅事件周辺の高分解能化学層序 (2013)
  • Author(s): 小福田 大輔 磯崎行雄 猪郷久義 可児智美 石村豊穂
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 千葉県幕張
• [Presentation] A REMARKABLE SEA-LEVEL DROP ACROSS THE GUADALUPIAN-LOPINGIAN BOUNDARY (PERMIAN) IN THE LOW-LATITUDES: UNIQUE HIATUS DETECTED ON A MID-PANTHALASSAN PALEO-ATOLL COMPLEX (2013)
  • Author(s): KOFUKUDA, Daisuke, ISOZAKI, Yukio, KANI, Tomomi, HISANABE, Chihiro, ISHIMURA, Toyoho,
  • Organizer: 2013 GSA Annual Meeting
  • Place of Presentation: 米国デンバー