Contrast Experiment about Dissolution of Feldspar in Different Freshwater Diagenetic Systems

Abstract

Abstract: In the same conditions of temperature and pressure(25 ℃,101,325 kPa), the interaction of atmospheric water-sandstone by comparative experiment of feldspar dissolution under different systems is explored in this paper, and it is confirmed that atmospheric water can eluviate aluminosilicate minerals. Feldspar dissolution by natural fresh water is simulated by comparative experiments among open system with sludge, open system without sludge and closed system without sludge. After the reaction, the change in the concentrations of Al3+,Si4+,Ca2+,K+ and HCO-3 ions in solution and scanning electron microscopy (SEM) observation showed that feldspar in the three systems have different levels of dissolution. Dissolution of different degree is open system with sludge＞open system without sludge＞closed system without sludge. Not only feldspar dissolution but also the quartz micro-dissolution phenomena are observed in open system without sludge and closed system without sludge. Degree of feldspar dissolution has relation with organic matter content and pH value. The phenomenon of feldspar dissolution in open system is more obvious than in the closed system.

Key words: feldspar, dissolution, SEM, secondary pore

CLC Number:

TE122.2

XU Mei-gui1,2,ZHANG Shao-nan1,3,FU Mei-yan1,2,FAN Xiao-cong1,2,.

Contrast Experiment about Dissolution of Feldspar in Different Freshwater Diagenetic Systems

[J]. Geoscience, 2013, 27(4): 925-933.

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