Determination of isotopic ratios, abundances and chemical species (chemical state) on platinum group elements and its application to the study of geochemical cycle and environmental change on the surface of the Earth

铂族元素同位素比、丰度和化学形态（化学态）的测定及其在地球化学循环和地球表面环境变化研究中的应用

• 批准号: 15204051
• 负责人: SHIMIZU Hiroshi
• 金额: $ 25.04万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15204051/
• 关键词: platinum group elements; Re-Os isotopic system; chemical species; XAFS; continental crust; iron meteorite; chert; mass extinction; XAFS; マルチトレーサ; 海水; Os同位体比; 海洋環境; ペルム紀-三畳紀境界; チャート; 白金鉱石; EXAFS; 地殻物質

Isotopic ratios, abundances and chemical species (chemical state) on platinum group elements were determined to study geochemical cycle and environmental change on the surface of the Earth.1. Rhenium-osmium systematics on continental crust : The first Re-Os isotopic data were reported for the Taklimakan Desert sands and glacial moraines from the Kunlun Mountains. The Taklimakan Desert sands from various regions show surprisingly homogeneous Os isotopic data. It is supported that the Taklimakan Desert sands are derived from moraines and river sediments around the desert or from Tibetan soils and are homogenized by aeolian activity in the deserts. Our Re-Os data for the Taklimakan Desert sands were compared with those of loess from the Loess Plateuau, and it was concluded that the Re-Os data for the loess can be used and as proxy for the upper continental crust.2. Speciation of osmium in an iron meteorite and a platinum ore specimen based on X-ray absorption fine-structure spectroscopy : … More We reported the first synchrotron radiation-based X-ray absorption fine structure (XAFS) spectra for Os in geo- and cosmo-chemical materials and showed that Os in the iron meteorite and the platinum ore chiefly exist as a metallic species. It is expected that further application of the XAFS technique to the Os speciation in natural samples will be help to elucidate Re/Os fractionation processes in the Re-Os isotopic system.3. Evolution of Os isotope ratios in the ocean (Osmium isotope ratio at P-T boundary) : Osmium isotopic compositions deduced from cherts from the outer zone in the southwest Japan show the higher contribution of mantle material to seawater from early Permian to Triassic, suggesting the mass extinction event at P-T boundary is more likely caused by large igneous province activity.4. Removal mechanism of Re and Os from seawater to sediments : In seawater-sediment system, it was shown that Re was removed from seawater only under reducing environment and Os was readily removed from seawater to sediments under various redox conditions. Less

确定地球表面的同位素比例，化学状态（化学状态）。 Neous OS同位素数据受到支持，taklimakan沙漠是从沙漠周围或藏族中衍生的，并通过沙漠中的Aeolian活动匀浆。对于上大陆的地壳。2。 XAFS）在地理上的OS光谱显示出刺的Tateorite，铂矿主要作为金属物种存在。 3。ARY）：从日本西南部的外带推导的osmium同位素组合，从早期二叠纪到三叠纪对海水的贡献更高，P-T边界的主题灭绝事件更大，是由大量的eodeos proving Active Attivation引起的。4从海水到沉积物的RE和OS：在海水沉积系统中，Re RealdiDy Remodilyter从Seawater Onvironmeng OS中恢复了RE，在各种catox onditions下的沉积物进行了重塑

项目成果

Geochemical study of the sediments at Site 1179, ODP Leg 191- direct observation of the oxidation states of Mn and Ce-

对 1179 号站点沉积物进行地球化学研究，ODP 第 191 段 - 直接观察锰和铈的氧化态 -

• 发表时间: 2004
• 期刊: Proceedings of Ocean Drilling Program, Sci. Results 191SR-007
• 作者: Yusa;H.;M.Fukukawa et al.
• 通讯作者: M.Fukukawa et al.

Characterization of aeolian dust in east China and Japan from 2001 to 2003

2001-2003年中国东部和日本风沙特征

• 发表时间: 2005
• 期刊: Journal of the Meteorological Society of Japan 83A
• 作者: T.Fujisawa;D.G.Austing;Y.Tokura;Y.Hirayama;S.Tarucha;Y.Kanai et al.
• 通讯作者: Y.Kanai et al.

Geochemistry of mantle and crust

地幔和地壳的地球化学

• 发表时间: 2003
• 作者: K.Notsu;H.Shimizu
• 通讯作者: H.Shimizu

M.Ito, et al.: "The study on Re and Os removal from seawaterto sediments using multitracer technique and XANES"Geochimica et Cosmochimica Acta. 67. A178 (2003)

M.Ito 等人：“使用多重示踪剂技术和 XANES 从海水到沉积物中去除 Re 和 Os 的研究”Geochimica et Cosmochimica Acta。

Determination of the Eu(II)/Eu(III) ratios in minerals by X-ray absorption near-edge structure (XANES) and its application to hydrothermal deposits

• DOI: 10.1180/0026461056920245
• 发表时间: 2005-04-01
• 期刊: MINERALOGICAL MAGAZINE
• 影响因子: 2.7
• 作者: Takahashi, Y;Kolonin, GR;Shimizu, H
• 通讯作者: Shimizu, H