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	In Situ Observation of Gypsum-Anhydrite Transition at High Pressure and High Temperature
	Liu Chuan-Jiang ; Zheng Hai-Fei
刊名	chinese physics letters
	2012
关键词	DIAMOND-ANVIL CELL PHASE-TRANSITIONS
DOI	10.1088/0256-307X/29/4/049101
英文摘要	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 496MPa. With increasing temperature, the anhydrite (CaSO4) phase precipitates at 250-320 degrees C in the pressure range of 1.0-1.5GPa, 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 degrees C <= T <= 320 degrees 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.; Physics, Multidisciplinary; SCI(E); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 0; ARTICLE; 4; 29
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/393512]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Liu Chuan-Jiang,Zheng Hai-Fei. In Situ Observation of Gypsum-Anhydrite Transition at High Pressure and High Temperature[J]. chinese physics letters,2012.
APA	Liu Chuan-Jiang,&Zheng Hai-Fei.(2012).In Situ Observation of Gypsum-Anhydrite Transition at High Pressure and High Temperature.chinese physics letters.
MLA	Liu Chuan-Jiang,et al."In Situ Observation of Gypsum-Anhydrite Transition at High Pressure and High Temperature".chinese physics letters (2012).

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