| GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS |
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In Situ Observation of Gypsum-Anhydrite Transition at High Pressure and High Temperature |
| LIU Chuan-Jiang1,ZHENG Hai-Fei2** |
1Key Laboratory of Orogenic Belts and Crustal Evolution (Ministry of Education), Peking University, Beijing 100871
2Institute of Geochemistry, Peking University, Beijing 100871 |
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| Cite this article: |
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LIU Chuan-Jiang, ZHENG Hai-Fei 2012 Chin. Phys. Lett. 29 049101 |
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Abstract An in-situ Raman spectroscopic study of gypsum-anhydrite transition under a saturated water condition at high pressure and high temperature is performed using a hydrothermal diamond anvil cell (HDAC). The experimental results show that gypsum dissolvs in water at ambient temperature and above 496 MPa. With increasing temperature, the anhydrite (CaSO4) phase precipitates at 250–320°C in the pressure range of 1.0–1.5 GPa, indicating that under a saturated water condition, both stable conditions of pressure and temperature and high levels of Ca and SO4 ion concentrations in aqueous solution are essential for the formation of anhydrite. A linear relationship between the pressure and temperature for the precipitation of anhydrite is established as P(GPa)=0.0068T−0.7126 (250°C≤T≤320°C). Anhydrite remained stable during rapid cooling of the sample chamber, showing that the gypsum-anhydrite transition involving both dissolution and precipitation processes is irreversible at high pressure and high temperature.
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Received: 09 December 2011
Published: 04 April 2012
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