Hydrothermal alteration zoning and kinetic process of mineral-water;interactions

	Hydrothermal alteration zoning and kinetic process of mineral-water;interactions
	Zhang, RH; Hu, SM; Su, YF
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2002
卷号	76 期号:3 页码:351-366
关键词	albite dissolution reaction rate incongruent dissolution critical point
ISSN号	1000-9515
英文摘要	This study reports the kinetic experimental results of albite in water and in KCl solution at 22 MPa in the temperature range of 25 to 400degreesC. Kinetic experiments have been carried out in an open flow-through reaction system (packed bed reactor). Albite dissolution is always incongruent in water at most temperatures, but becomes congruent at 300degreesC (close to the critical point 374degreesC). At temperatures from 25 to 300degreesC, the incongruent dissolution of albite is reflected by the fact that sodium and aluminum are easily dissolved into water; from 300 to 400degreesC it is reflected by silicon being more easily dissolved in water than Al and Na. Maximum albite dissolution rates in the flow hydrothermal. systems have been repeatedly observed at 300degreesC, independent of flow rates.;The kinetic experiments of albite dissolution in a KCl aqueous solution (0.1 mol KC) indicate that the dissolution rate of albite increases with increasing temperature. Maximum silicon release rates of albite have been observed at 4000degreesC, while maximum aluminum release rates of albite at 374degreesC. The reaction rates of albite also depend on the potassium concentration in the aqueous solution.;These results can be used to interpret the mechanism for forming hydrothermal alteration. The kinetic experiments of mineral-aqueous solutions interactions in the hydrothermal system from 25 to 400degreesC and at 22 MPa indicate that the formation of the feldspar-mica-kaolinite zoning occurring in some ore deposits may depend not only on the mineral stability but also on the kinetics of feldspar hydration, which is affected by the water property variation when crossing the critical point.
学科主题	岩矿鉴定与测试
WOS关键词	AQUEOUS-SOLUTIONS ; REACTION-RATES ; SUPERCRITICAL WATER ; DISSOLUTION ; RATES ; RATE CONSTANTS ; SURFACE-AREA ; FLOW SYSTEMS ; CONSTRAINTS ; FELDSPAR ; HYDROLYSIS
WOS研究方向	Geology
语种	英语
出版者	WILEY-BLACKWELL
WOS记录号	WOS:000179589700010
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37514]
专题	中国地质科学院地质研究所
作者单位	Chinese Acad Geol Sci, Inst Mineral Resources, Open Res Lab Geochem Kinet, Beijing 100037, Peoples R China.
推荐引用方式 GB/T 7714	Zhang, RH,Hu, SM,Su, YF. Hydrothermal alteration zoning and kinetic process of mineral-water;interactions[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2002,76(3):351-366.
APA	Zhang, RH,Hu, SM,&Su, YF.(2002).Hydrothermal alteration zoning and kinetic process of mineral-water;interactions.ACTA GEOLOGICA SINICA-ENGLISH EDITION,76(3),351-366.
MLA	Zhang, RH,et al."Hydrothermal alteration zoning and kinetic process of mineral-water;interactions".ACTA GEOLOGICA SINICA-ENGLISH EDITION 76.3(2002):351-366.