Rhenium-Osmium geochemistry for the mantle plume and the Kuroko ore deposits formed at the time of the opening of the Japan Sea

日本海开放时形成的地幔柱和黑子矿床的铼-锇地球化学

• 批准号: 08454141
• 负责人: TERAKADO Yasutaka
• 金额: $ 4.29万
• 依托单位: KOBE UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08454141/
• 关键词: Rhenium-Osmium method; Opening of the Japan Sea; Kuroko ore deposits; Mantle plume

In this study, the mass-spectrometer used was reconstructed and arranged to measure negative ion beams and to improve the stability. Re and Os concentrations and Os isotopic compositions were measured for several rocks and minerals. These data as well as the blank values indicate that at present some rocks and minerals which has relatively high concentrations of these elements can provide usable data for geological discussion, but some rocks and minerals do not contain enough amounts of these elements for analyzes. Much efforts should be necessary for lowering the blank values. Despite such incomplete attainment for analytical methods, some useful information can be drawn from relatively high concentration materials. In the present study, the initial Os isotopic ratio for the Kuroko ore deposits were found to be around the values of the seawater, suggesting that the Kuroko minerals had been precipitated from the seawater. Moreover, some other geological standard rocks and magnetites separated from the granitiv rocks were measured.

本研究对所使用的质谱仪进行了改造和布置，以测量负离子束并提高稳定性。测量了几种岩石和矿物的铼和锇浓度以及锇同位素组成。这些数据以及空白值表明，目前一些岩石和矿物中这些元素含量较高，可以为地质讨论提供可用的数据，但有些岩石和矿物中这些元素的含量不足以进行分析。降低空白值需要付出很大的努力。尽管分析方法尚未完全实现，但可以从相对高浓度的材料中得出一些有用的信息。在本研究中，发现黑子矿床的初始锇同位素比值约为海水值，表明黑子矿物是从海水中沉淀出来的。此外，还测量了其他一些地质标准岩石和从花岗岩岩石中分离出来的磁铁矿。

项目成果

Y.Terakado and T.Fujitani: "Behaviour of the rare earth elements and other trace elements during interactions between acidic hydrothermal solutions and silicic volcanic rocks, southwestern Japan." Geochimica et Cosmochimica Acta. 62(印刷中). (1998)

Y. Terakado 和 T. Fujitani：“酸性热液与硅质火山岩相互作用过程中稀土元素和其他微量元素的行为，日本西南部的 Geochimica et Cosmochimica Acta”（1998 年出版）。

Y.Terakado, T.Fujitani and R.J.Walker: "Nd and Sr isotopic constraints on the origin of igneous rocks resulting from the opening of the Japan Sea, southwestern Japan." Contributions to Mineralogy and Petrology. 129. 75-86 (1997)

Y.Terakado、T.Fujitani 和 R.J.Walker：“Nd 和 Sr 同位素对日本西南部日本海开口形成的火成岩起源的限制。”

Y.Terakado and T.Fujitani: "Behavior of the rare earth elements and other trace elements during interactions between acidic hydrothermal solutions and silicic volcanic rocks, southwestern Japan." Geochimica et Cosmochimica Acta. Vol.62, (in press). (1998)

Y.Terakado 和 T.Fujitani：“日本西南部酸性热液与硅质火山岩相互作用时稀土元素和其他微量元素的行为。”

Y.terakado, T.Fujitani and R.J.Walker: "Nd and Srisotopic constraints on the origin of igneous rocks resulting from the opening of the Japan Sea, southwestem Japan." Contributions to Mineralogy and Petrology. 129. 75-86 (1997)

Y.terakado、T.Fujitani 和 R.J.Walker：“Nd 和同位素对日本西南部日本海开口造成的火成岩起源的限制。”

Y.terakado, T.Fujitani: "Behaviour of the rare earth elements and other trace elements during interactions between acidic hydrothermal solutions and silicic volcanic rocks,southwestern Japan." Geochimica et Cosmochimica Acta. 62(印刷中). (1998)

Y.terakado、T.Fujitani：“日本西南部的酸性热液和硅质火山岩相互作用时稀土元素和其他微量元素的行为”（Geochimica et Cosmochimica Acta）（1998 年）。