Experimental study on the flow-through interaction between andesine and   alkali-chloride hydrothermal solutions

CORC > 北京大学 > 地球与空间科学学院

	Experimental study on the flow-through interaction between andesine and alkali-chloride hydrothermal solutions
	Zeng, YS ; Ai, RY ; Ai, YF
刊名	neues jahrbuch fur mineralogie monatshefte
	1998
关键词	NaCl and KCl+NaCl aqueous solutions andesine solution-mineral interaction flow-through experiment titanium-gold hydrothermal apparatus alkali-metamorphism DISSOLUTION KINETICS ALBITE PH
英文摘要	The interactions between andesine grains (0.25-0.45 mm) and NaCl and KCl+NaCl solutions were experimentally studied under flow-through conditions (flow rates of solution: 7 ml/h and 1 ml/h) at 300 degrees C and 50 MPa. For comparison, corresponding static runs were performed at the same pressure and temperature. All these experiments were carried out in a flexible gold cell hydrothermal apparatus. The emphasis of the present study was laid on the changes in the composition of solid surface and solution chemistry at the early stage of the interaction. After the reaction an appreciable amount of etch pits and crystallites of alkali-rich feldspar appeared on the surface of the andesine. The statistical treatment of the SEM/EDAX data for the surface of the mineral reacted showed an increase in the atomic ratio of Si/Al, (K+Na)/Ca and (K+Na)/Al and a decrease in the ratio of Ca/Al, compared with the starting andesine. During the interactions, pH of solutions increased and considerable amounts of Si and Ca were transferred into the aqueous phase. In the NaCl solution experiment at a flow rate of 7 ml/h, the variations of the Si, Al, Ca and K concentration with time were very distinct. The static or "low" flow rate (1 ml/h) reaction conditions and the presence of KCl in solution seemed to hinder the release of Si in andesine to aqueous solution. It is concluded that alkali-metasomatism of andesine at flow-through condition involves the dissolution of the mineral, and the formation of alkali-rich feldspar.; Mineralogy; SCI(E); 1; ARTICLE; 5; 193-207
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/311007]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zeng, YS,Ai, RY,Ai, YF. Experimental study on the flow-through interaction between andesine and alkali-chloride hydrothermal solutions[J]. neues jahrbuch fur mineralogie monatshefte,1998.
APA	Zeng, YS,Ai, RY,&Ai, YF.(1998).Experimental study on the flow-through interaction between andesine and alkali-chloride hydrothermal solutions.neues jahrbuch fur mineralogie monatshefte.
MLA	Zeng, YS,et al."Experimental study on the flow-through interaction between andesine and alkali-chloride hydrothermal solutions".neues jahrbuch fur mineralogie monatshefte (1998).