Kinetics of Quartz Dissolution in Natural Silicate Melts and Dependence of SiO2 Diffusivity on Melt Composition

2019 ◽  
Vol 3 (4) ◽  
pp. 599-616 ◽  
Author(s):  
Yi Yu ◽  
Youxue Zhang ◽  
Yuping Yang
Keyword(s):  
Silicate Melts ◽  
Quartz Dissolution ◽  
Natural Silicate ◽  
Melt Composition ◽  
Kinetics Of

Annealing experiments on CO2-bearing jadeite glass: an insight into the true temperature dependence of CO2 speciation in silicate melts

2001 ◽  
Vol 65 (6) ◽  
pp. 701-707 ◽  
Author(s):  
Y. Morizet ◽  
S. C. Kohn ◽  
R. A. Brooker
Keyword(s):  
Temperature Dependence ◽  
Rate Constants ◽  
Negative Charge ◽  
Silicate Melts ◽  
True Temperature ◽  
Carbonate Group ◽  
Image Position ◽  
Kinetics Of ◽  
Annealing Experiments ◽  
Insight Into

AbstractThe thermodynamics and kinetics of CO2 speciation in silicate melts have been studied by measuring the concentration of CO2mol and carbonate in jadeite glass annealed at 575, 450 and 400°C. Assuming that the reaction is1where CO2mol..Obr represents a CO2 molecule weakly bonded to a bridging oxygen in the network and CO3 represents a bridging carbonate group with no net negative charge, ΔH for the reaction is –17 (+4/–8) kJ mol−1 and ΔS is –24 (+6/–9) J K−1 mol−1. The rate of equilibration of the species was measured at each temperature and the rate constants were deduced. The temperature dependence of the rate constants was used to determine the activation energy of the forward and reverse reactions which are 68 (+3/–31) kJ mol−1 and 86 (+1/–69) kJ mol−1 respectively. The data suggest that CO2mol may be much more abundant in silicate melts than previously assumed on the basis of studies of CO2-bearing glasses. Models of solubility, diffusion, and isotope fractionation should take this into account.

scholarly journals Effects of F, B2O3 and P2O5 on the solubility of water in haplogranite melts compared to natural silicate melts

1993 ◽  
Vol 113 (4) ◽  
pp. 492-501 ◽  
Author(s):  
Fran�ois Holtz ◽  
Donald B. Dingwell ◽  
Harald Behrens
Keyword(s):  
Silicate Melts ◽  
Natural Silicate

Determination of thermal conductivity of natural silicate melts

2000 ◽  
Vol 77 (12) ◽  
pp. 1810 ◽  
Author(s):  
R. Büttner ◽  
B. Zimanowski ◽  
C. Lenk ◽  
A. Koopmann ◽  
V. Lorenz
Keyword(s):  
Thermal Conductivity ◽  
Silicate Melts ◽  
Natural Silicate
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