Experimental magnesitization of calcite at 150℃ and partitioning behavior of REE between magnesite and hydrothermal solution
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- NAKANO Yu
- Department of Earth and Planetary Sciences, Graduate School of Environmental Studies, Nagoya University
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- KAWABE Iwao
- Department of Earth and Planetary Sciences, Graduate School of Environmental Studies, Nagoya University
Bibliographic Information
- Other Title
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- 熱水条件(150℃)におけるカルサイトのマグネサイト化反応の条件とマグネサイトと熱水溶液間の希土類元素分配挙動
- ネッスイ ジョウケン 150ドC ニ オケル カルサイト ノ マグネサイトカ ハンノウ ノ ジョウケン ト マグネサイト ト ネツ スイヨウエキ カン ノ キドルイ ゲンソ ブンパイ キョドウ
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Abstract
Reagent grade calcite was reacted with MgCl2 solutions doped with REE (Mg concentration of 0.089M-1.8M and REE concentration of about 0.3 ppm each) at 150℃ for 10 or 20 days. Solid products were identified by X-ray diffraction. Solid and liquid phases were analyzed for Mg, Ca and REE. The solid phases reacted with MgCl2 solutions (0.89M and 1.8M of Mg2+) were almost magnesite (about 95%). The molar ratios of Mg/(Mg + Ca) in solutions of the run products were consistent with the extrapolation of the reported experimental equations in the high temperature range from 275℃ to 420℃ to lower temperatures. The values of pH at room temperature of the final solutions are ranging from 5-7, and they show a decreasing trend with increasing Mg concentration. This is probably caused by the precipitation reaction of brucite, which is more likely to occur at 150℃ than at 25℃. The REE partition coefficients between solid and liquid phases defined by Kd(REE)={XREE/(XMg+XCa)}solid/{[REE]/([Mg]+[Ca])}liquid have been determined experimentally. The series variation of logKd (REE) in the run in which the solid phases were almost magnesite, shows a decreasing trend in LREE and a convex tetrad effect.
Journal
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- Chikyukagaku
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Chikyukagaku 40 (3), 239-244, 2006
The Geochemical Society of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390282680718364928
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- NII Article ID
- 110008680129
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- NII Book ID
- AN00141280
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- ISSN
- 21885923
- 03864073
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- NDL BIB ID
- 8077448
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed