Establishing a new method for Cr isotopes to understand redox change of seawater in the geological pasts

建立Cr同位素了解地质过去海水氧化还原变化的新方法

• 批准号: 23740387
• 负责人: KURODA Junichiro
• 金额: $ 3万
• 依托单位: Japan Agency for Marine-Earth Science and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23740387/
• 关键词: 古海洋; クロム同位体; 酸化還元変動; 白亜紀; 海洋無酸素事変; 酸化還元電位

During the two years, I have established a new method to separate Cr from sedimentary rocks deposited in the geological past to measure Cr isotopes which could be a new indicator of oxic-anoxic condition of seawater in the deep time. I measured major, trace and rare earth element concentrations as well as Cr isotopic compositions of carbonate rocks of Lower Cretaceous sediments from Mid-Pacific Mountains. I compared chemical compositions of carbonate between deep pelagic chalk from DSDP Site 463, and shallow water limestone from ODP Site 866 on Resolution Guyot. My data track a stratigraphic interval representing Oceanic Anoxic Event (OAE)-1a of early Aptian time, characterised by an almost synchronous global deposition of organic carbon-rich black shale. The data suggest that seawater chemistry have changed a few hundred of thousand years before OAE-1a.

在两年的时间里，我建立了一种新的方法，从沉积在地质历史的沉积岩中分离铬，测量铬同位素，这可能是一个新的指标，在深部的海水缺氧缺氧条件。我测量了主，微量和稀土元素的浓度以及铬同位素组成的下白垩统沉积物中太平洋山脉的碳酸盐岩。在分辨率盖奥特上，我比较了DSDP 463站深海白垩和ODP 866站浅水石灰岩之间碳酸盐的化学成分。我的数据跟踪地层间隔代表海洋缺氧事件（OAE）-1a早期阿普梯时间，其特征是几乎同步的全球沉积的有机碳丰富的黑色页岩。这些数据表明，在OAE-1a之前的几十万年，海水化学已经发生了变化。

项目成果

掘削試料からみる地中海の歴史

从出土样本看地中海的历史

• 作者: Saito T. Miyoshi H.;Nishio-Hamane D.;栗谷豪;黒田潤一郎
• 通讯作者: 黒田潤一郎

中生代の巨大火成岩区の噴火と古環境変動

中生代巨型火成岩区的喷发与古环境变化

• 作者: T. Felis;Ryuji ASAMI;P. Deschamps;E. C. Hathorne;M. Kolling;N. Durand;G. Cabioch;and E. Bard;黒田潤一郎，堀利栄，鈴木勝彦，大河内直彦
• 通讯作者: 黒田潤一郎，堀利栄，鈴木勝彦，大河内直彦

地球と宇宙の化学事典 1-12 火山活動と地球環境変動

地球与空间化学百科全书1-12 火山活动与全球环境变化

• 发表时间: 2012
• 作者: Ryuji ASAMI;T. Felis;P. Deschamps;K. Hanawa;Y. Iryu;E. Bard;N. Durand;and M. Murayama;黒田潤一郎
• 通讯作者: 黒田潤一郎

Lead isotopic record of Barremian-Aptian marine sediments: Implications for large igneous provinces and the Aptian climatic crisis

• DOI: 10.1016/j.epsl.2011.04.021
• 发表时间: 2011-07
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: J. Kuroda;M. Tanimizu;R. Hori;Katsuhiko Suzuki;N. Ogawa;M. Tejada;M. Coffin;R. Coccioni;E. Erba;N. Ohkouchi

Data report: Volcanic glass shards from Eocene-Oligocene transition interval at Site U1333, In Palike, H., Lyle, M., Nishi, H., Raffi, I., Gamage, K., Klaus, A., and the Expedition 320/321 Scientists

数据报告：U1333 站点始新世-渐新世过渡区间的火山玻璃碎片，In Palike, H.、Lyle, M.、Nishi, H.、Raffi, I.、Gamage, K.、Klaus, A. 和探险队

• 发表时间: 2013
• 期刊: Proceedings of the Integrated Ocean Drilling Program, Tokyo (Integrated Ocean Drilling Program Management International, Inc.)
• 作者: Junichiro Kuroda and Thomas Westerhold;Data report : Volcanic glass shards from Eocene-Oligocene transition interval at Site U1333;In Pälike;H.;Lyle;M.;Nishi;H.;Raffi;I.;Gamage;K.;Klaus;A.;and the Expedition 320/321 Scientists
• 通讯作者: and the Expedition 320/321 Scientists