Comprehensive Study on Ocean Floor Dynamics

洋底动力学综合研究

• 批准号: 11204101
• 负责人: TOKUYAMA Hidekazu
• 金额: $ 81.28万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11204101/
• 关键词: Subduction Zone; Mantle Plume and Oceanic Plateau; Methane Hydrate; Deep Biosphere and its Evolution; Environmental Changes of Earth Surface; ホットスポット; プリューム活動; 海洋無酸素事変; 炭素同位体比の負のシフト; 海底地圏微生物; 変形フロント; デコルマ面; マニヒキ海台; 孔内長期地震観測ステーション; 南海トラフ; 孔内

Ocean floor controls an emission of heat and mass from the interior part of the Earth, in particular from mantle. And, ocean acts as a reservoir of mass flux in earth system in a sense, suggesting that the Earth is related to the circulation of mass in the upper part of the Earth.It is well known that history of dynamic earth system has been recorded in deep ocean floor sediments since last 150Ma. Therefore, decoding of the record will provide us new information that creates new paradigm of earth science.In order to develop deep ocean floor science, we need core drilling samples recovered from deep sea as the first step. The second step is characterized by geochemical and geophysical analysis including age determination. The third is in situ geophysical and geochemical measurement in borehole. Finally, we set up long-term borehole observatory in order to monitor ongoing dynamic change of the Earth interior.Our research group is composed following five subgroups such as comprehensive ocean floor dynamics subgroup, subduction zone subgroup, oceanic plateau and mantle plume subgroup, methane hydrate subgroup, and deep biosphere /evolution of life group.The results of our research are listed as follows.1) New scenario regarding to the process of methane hydrate formation, dissociation, and concentration is proposed2) Extremely warm climate and mass extinction of life are closely related to dissociation of methane hydrate3) Millennium scale environmental change is induced by thermal and dynamic impact resulting from outside of globe4) Surface global environmental change is associated with plate dynamics5) Global seismic network using borehole is constructed6) New findings are acquired in both fields of ecosystem of bacteria in deep crust and circulation of surface mass of the Earth

海底控制着地球内部，特别是地幔的热量和质量的排放。而且，从某种意义上说，海洋充当地球系统中质量通量的储层，这表明地球与地球上部的质量循环有关。众所周知，自上次150ma以来，在深海地板沉积物中已经记录了动态地球系统的历史。因此，对记录的解码将为我们提供新的信息，从而创建新的地球科学范式。为了开发深海科学，我们需要从深海中回收的核心钻探样品作为第一步。第二步的特征是地球化学和地球物理分析，包括年龄确定。第三个是钻孔的原位地球物理和地球化学测量。最后，我们建立了长期的井眼观测站，以监视地球内部正在进行的动态变化。我们的研究小组遵循五个亚组，例如综合的海底动态亚组，俯冲区亚组，海洋高原和披风羽状亚组，甲烷水合物亚组和深度生物层的研究。提出了甲烷水合物形成，解离和浓度2））气候极温暖，生命的质量灭绝与甲烷水合物的解离密切相关。3）千年尺度的环境变化是由全球范围内的热和动态影响引起的。在深层地壳和地面质量的循环中

项目成果

Drilling contamination tests during ODP Leg 201 using chemical and particulate tracers

• DOI: 10.2973/odp.proc.ir.201.102.2003
• 发表时间: 2003-01-01
• 期刊: Proceedings of the Ocean Drilling Program, Initial Reports

Drilling reveals climatic consequences of Tasmanian Gateway Opening

• DOI: 10.1029/2002eo000176
• 发表时间: 2002-06
• 期刊: Eos, Transactions American Geophysical Union
• 作者: N. Exon;J. Kennett;M. Malone;H. Brinkhuis;G. Chaproniere;A. Ennyu;P. Fothergill;M. Fuller;M. Grauert;P. Hill;T. Janecek;C. Kelly;J. Latimer;K. Mcgonigal;Stefan Nees;U. Ninnemann;D. Nuernberg;S. Pekar;Caroline Pellaton;H. Pfuhl;C. Robert;U. Röhl;S. Schellenberg;A. Shevenell;C. Stickley;N. Suzuki;Y. Touchard;Wuchang Wei;T. White

Late Mesozoic and Cenozoic rifting and its dynamic setting in Eastern China and adjacent areas

• DOI: 10.1016/s0040-1951(01)00271-2
• 发表时间: 2002-02
• 期刊: Tectonophysics
• 影响因子: 2.9
• 作者: Jianye Ren;K. Tamaki;Sitian Li;Junxia Zhang

Proceedings of the Ocean Drilling Program

• 发表时间: 2002
• 作者: Focused Resistivity;David A. Falvey Director;R. Duce;Curator and Manager Information Services Russell B. Merrill-Curator-and-Manager-Information-Services-Russell-B.-227080

Seismic structure of western end of the Nankai trough seismogenic zone

• DOI: 10.1029/2000jb000121
• 发表时间: 2002-10
• 期刊: Journal of Geophysical Research
• 作者: N. Takahashi;S. Kodaira;A. Nakanishi;Jin-Oh Park;S. Miura;T. Tsuru;Y. Kaneda;K. Suyehiro;H. Kinoshita;N. Hirata;T. Iwasaki