Global Warming in the Proterozoic; extensive decarbonation event in the lower crust and its implications to the surface environment

元古代全球变暖；

• 批准号: 20606002
• 负责人: OMORI Soichi
• 金额: $ 2.91万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20606002/
• 关键词: 原生代; 温室効果; 脱炭酸反応; 下部地殻; 環境変動; 地質学; 二酸化炭素; 地殻流体; 流体包有物; ジルコン; グラニュライト; 超高温変成岩

Field works in Kerala, southern India and Adirondack Mountains, NY were done. Petrographic observations of samples from these localities were done. It has been confirmed that CO_2 fluid inclusions in garnet and zircon were common in these lower-crust rocks. A numerical model of the CO_2 cycle connecting the solid Earth and the surface environment was constructed. It has been demonstrated that an expected decarbonation event in the Proterozoic had extensive effect to the Earth's surface temperature. A new method to estimate a thermal structure of the subduction zone was developed. These results were presented in 6 talks and published as 13 papers in academic journals.

在印度南部的喀拉拉邦和纽约州的阿迪朗达克山脉进行了实地考察。对这些地区的样品进行了岩相学观察。证实了这些下地壳岩石中普遍存在石榴石和锆石中的CO_2流体包裹体。建立了一个连接固体地球与地表环境的CO_2循环数值模式。已有研究表明，元古代的一次预期的脱碳酸事件对地球表面温度有着广泛的影响。提出了一种估算俯冲带热结构的新方法。这些结果在6次演讲中发表，并在学术期刊上发表了13篇论文。

项目成果

A new perspective on metamorphism and metamorphic belts

• DOI: 10.1016/j.gr.2010.03.007
• 发表时间: 2010-07
• 期刊: Gondwana Research
• 影响因子: 6.1
• 作者: S. Maruyama;H. Masago;I. Katayama;Y. Iwase;M. Toriumi;S. Omori;K. Aoki

Metamorphic decarbonation in the Proterozoic ultrahigh-temperature metamorphism and its environmental implication

元古代超高温变质作用中的变质脱碳作用及其环境意义

• 发表时间: 2008
• 作者: Omori S.;Santosh M.
• 通讯作者: Santosh M.

Counter-clockwise prograde P–T path in collisional orogeny and water subduction at the Precambrian–Cambrian boundary: The ultrahigh-pressure pelitic schist in the Kokchetav massif, northern Kazakhstan

• DOI: 10.1016/j.gr.2008.07.001
• 发表时间: 2009-04
• 期刊: Gondwana Research
• 影响因子: 6.1
• 作者: H. Masago;S. Omori;S. Maruyama

CO2 windows from mantle to atmosphere: Models on ultrahigh-temperature metamorphism and speculations on the link with melting of snowball Earth

• DOI: 10.1016/j.gr.2007.11.001
• 发表时间: 2008-08
• 期刊: Gondwana Research
• 影响因子: 6.1
• 作者: M. Santosh;S. Omori

Metamorphic P-T-time history of the Sanbagawa belt in central Shikoku, Japan and implications for retrograde metamorphism during exhumation

日本四国中部三波川带变质作用的P-T时间历史及其对折返过程中逆变质作用的意义

• 发表时间: 2009
• 期刊: Lithos 113
• 作者: K.Aoki;K.Kitajima;H.Masago;M.Nishizawa;M.Terabayashi;S.Omori;T.Yokoyama;N.Takahata;Y.Sano;S.Maruyama
• 通讯作者: S.Maruyama