Determination of the Os isotopic compositions of primary arc magma using chromite and estimation of slab components contribution

使用铬铁矿测定原生弧岩浆的锇同位素组成并估计板片成分的贡献

• 批准号: 20340158
• 负责人: SUZUKI Katsuhiko
• 金额: $ 10.9万
• 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 Scientific Research (B)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20340158/
• 关键词: 地殻・マントル化学; 沈み込み帯; 島弧火山岩; オスミウム同位体; 始源的マグマ; クロマイト; マントル; 地殻の同化; リサイクル

Significant contrast in Os isotopic compositions between mantle and crust allow us to estimate recycled component from subducted slab quantitatively based on the Os isotopic compositions of arc volcanic rocks. However, crustal assimilation during magma ascent possibly masks the original Os isotopic compositions of primary magma. Here we analyze Os in chromites separated from beach sands or whole rocks themselves to determine the Os isotopic compositions of primary magma. Chromite is crystallized in the early stage of magma evolution, and most likely provides information on the chemical compositions of primary magma. We could clearly distinguish the Os from subducted slab and that assimilated during magma ascent. Also, The obtained results showed the oxidation processes of wedge mantle in arc evolution.

地幔和地壳之间的OS同位素组合物的显着对比，使我们能够根据电弧火山岩的OS同位素组合物定量地从俯冲平板中估算回收分量。但是，岩浆上升期间的地壳同化可能会掩盖原发性岩浆的原始OS同位素组成。在这里，我们分析与海滩沙或整个岩石分离的铬铁矿中的OS，以确定原代岩浆的OS同位素组成。铬铁矿在岩浆进化的早期阶段结晶，很可能提供有关原代岩浆化学成分的信息。我们可以清楚地将OS与俯冲平板区分开，并在岩浆上升期间被吸收。此外，获得的结果显示了弧度进化中楔形地幔的氧化过程。

项目成果

Ontong Java Plateau eruption as a trigger for the early Aptian oceanic anoxic event

• DOI: 10.1130/g25763a.1
• 发表时间: 2009-09
• 期刊: Geology
• 影响因子: 5.8
• 作者: M. Tejada;Katsuhiko Suzuki;J. Kuroda;R. Coccioni;J. Mahoney;N. Ohkouchi;T. Sakamoto;Y. Tatsumi

Re-Os ages of the Shimokawa and Makimine Besshi-type massive sulfide deposits : New age constraints for a timing of the Kula Ridge subduction into the paleo-Japanese Island

下川和牧峰别子型块状硫化物矿床的铼年龄：库拉海岭俯冲到古日本岛时间的新年龄限制

• 发表时间: 2011
• 作者: T.Nozaki.;Y.Kato.;K.Suzuki.;Y.Takaya.;K.Nakayama
• 通讯作者: K.Nakayama

Volcanism of the Ontong Java Plateau recorded in the Early Aptian pelagic sediments and its implication as a trigger of Antian Oceanic Anoxic Event

早期阿普第期远洋沉积物中记录的翁通爪哇高原火山活动及其作为安蒂期海洋缺氧事件触发因素的意义

• 发表时间: 2008
• 作者: M.Shiga;K.Suzuki;M.Tachikawa;Junichiro Kuroda
• 通讯作者: Junichiro Kuroda

琉球弧久米島に産出するピクライト玄武岩の起源～全岩・スピネルOs同位体比組成からの考察

琉球岛弧久米岛产苦味玄武岩的成因——从全岩和尖晶石Os同位素组成的思考

• 发表时间: 2009
• 作者: Huo Zhibao;Gridnev Ilya D;Yamamoto Yoshinori;仙田量子
• 通讯作者: 仙田量子

Visualization of geoscience data on Google Earth : development of data converter system for seismic tomography models, geochemical data of rocks, and geomagnetic field models

Google Earth上地球科学数据的可视化：开发地震层析成像模型、岩石地球化学数据和地磁场模型的数据转换系统

• 发表时间: 2008
• 作者: Ichikawa;J.;Yasuko Yamagishi
• 通讯作者: Yasuko Yamagishi