权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

The study of Geochemical Processes in the trench Environment using trace constituent and isotopic techniques.

使用痕量成分和同位素技术研究海沟环境中的地球化学过程。

基本信息

批准号：
07404051
负责人：
NOZAKI Yoshiyuki
金额：
$ 5.12万
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 (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07404051/
关键词：
Geochemical cycle Mass spectrometry Japan Trench Izu-Ogasawara Trench Sediment trap Indium Rare earth elements 伊豆小笠原海溝

项目摘要

The purpose of this study is to understand geochemical processes in super-deep trench environment, such as the Japan and Izu-Ogasawara trenches.Trenches exhibit characteristic topographic features of V shaped valley exceeding 7000 m depth, and are important zone for subduction of sedimentary materials. Similarly to isolated basins, the oceanographic environment inside trenches is considered to be different from that of typical ocean floor. However, systematic investigations of oceanography and geochemistry of the trench environment are few to date and largely remains "untouched". We have investigated by collecting samples of seawater, sediments and particulate matter from the deepest parts of the Japan and Izu-Ogasawara trenches for various analysis. For comparison, we have also carried out geochemical study in the Indian Ocean including the Sulu Sea, South China Sea and Andaman Sea. This year, we have further extended our research to the Japan Trench, Sea of Okhotsk and the Japan Sea and published a final report.Summary of the outcomes are ;1) We obtained the data on the vertical distributions of natural and man-made radionuclides and some heavy metals throughout the water column of the Japan and Izu-Ogasawara trenches for the first time, and published a paper in Oceanologica Acta,2) We published the results and their implications of rare earth elements in particulate matter collected by sediment trap in the Japan Trench in Earth and Planetary Science Letters,3) We continued to work on dissolved rare earth elements and In using ICP mass spectrometry and published the results and their implications in two papers in Geochimica et Cosmochimica Acta,4) We have obtained the data on Nd isotopes in surface seawater which can be interpreted by different sources, water circulation. The results will be published shortly.We hope that these results will stimulate further systematic and comprehensive study in near future.

本研究的目的是了解超深海沟环境中的地球化学过程，如日本海沟和伊豆-小川海沟。海沟具有超过7000m深的V形山谷的地貌特征，是沉积物质俯冲的重要地带。与孤立的盆地类似，海沟内的海洋环境被认为不同于典型的海底环境。然而，迄今为止，对海沟环境的海洋学和地球化学的系统研究还很少，基本上仍处于“未被触及”的状态。我们收集了日本和伊豆-小川海沟最深处的海水、沉积物和颗粒物样本进行了调查，以进行各种分析。作为对比，我们还在包括苏鲁海、南中国海和安达曼海在内的印度洋进行了地球化学研究。今年，我们进一步将我们的研究扩展到日本海沟、鄂霍次克海和日本海，并发表了最终报告。1)首次获得了天然和人造放射性核素以及一些重金属在日本水柱和伊豆-小川海沟中的垂直分布数据，并在《海洋学报》上发表了一篇论文；2)我们发表了日本海沟沉积物捕捉器采集的颗粒物中稀土元素的结果及其意义；3)我们继续进行了溶解稀土元素和电感耦合等离子体质谱仪的研究，并在《地球物理与宇宙学报》上发表了两篇论文，4)我们获得了表层海水中可由不同来源解释的稀土元素的数据，水循环。这些结果将在短期内公布，我们希望这些结果将在不久的将来刺激进一步的系统和全面的研究。