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| Study on Temperature-Pressure Conditions of Brucite Formation in Wolsa Marble, North Korea |
| JIN Run-cheng1, LI Guo-wu2, LUO Zhong-lie1, JIN Yin-he1, ZHAO Yong-yan1 |
1. School of Resource Exploration Engineering, KimChaek University of Technology, Pyongyang, Korea;
2. China University of Geosciences(Beijing), Beijing 100083, China |
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Abstract In this study, we attempted to use the mineral composition of the newly discovered brucite-bearing marble from the Wolsa district to constrain the temperature-pressure conditions of brucite formation. Mineral composition was performed by petrography, XRD, chemical, and thermal analyses on brucite-bearing marble. In terms of mineral compositions, the reaction equation forming brucite was established and the thermodynamic model was evaluated. The brucite-bearing marble is composed of 30.33% of brucite, 10.51% of dolomite, 56.66% of calcite and a small amount of periclase. Brucite is a hydration product of periclase and appears as a typical fibrous aggregate. Thermodynamic modeling indicates that the decomposition of dolomite to periclase is gradually formed under low temperature (426-550℃) and low pressure (<2.6 MPa), in the shallow region close to the surface during long-term geological process.
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