Mg-olivine

Silicates also lead to uptake of CO2. Weathering of a non-aluminum silicate like Mg-olivine may be written... 

Bish D. L. (1981). Cation ordering in synthetic and natural Ni-Mg olivine. Amer. Mineral, 66 770-776. 

Bostrom D. (1988). Experimental studies of (Ni,Mg)—and (Co,Mg)—olivine solid solutions by single crystal X-ray diffraction and solid state emf method. Ph.D. thesis. Department of Inorganic Chemistry, University of Umea, Umea, Sweden. 

Chatteijee N. (1987). Evaluation of thermochemical data on Fe-Mg olivine, orthopyroxene, spinel and Ca-Fe-Mg-Al garnet. Geochim. Cosmochim. Acta, 51 2515-2525. 

Davidson P. M. and Mukhopadhyay D. K. (1984). Ca-Fe-Mg olivines Phase relations and a solution model. Contrib. Mineral Petrol, 86 256-263. 

Ottonello G., Della Giusta A., and Molin G. M. (1989). Cation ordering in Ni-Mg olivines. Amer. Mineral, 74 411 21. 

Other examples discussed later where changes of spectrum profiles across a solid-solution series correlate with cation ordering in the crystal structure include Ni-Mg olivines (Hu et al., 1990), in which Ni2+ ions are strongly ordered in the Ml sites ( 5.4.2.4), and Mg-Fe2+ orthopyroxenes mentioned earlier where strong enrichment of Fe2+ ions occurs in the very distorted M2 sites ( 5.5.4). 

Bostrom, D. (1987) Single-crystal X-ray diffraction studies of synthetic Ni-Mg olivine solid solutions. Amer. Mineral., 72,965-72. 

Ozawa K. and Nagahara H. (2000) Kinetics of diffusion-controlled evaporation of Fe-Mg olivine experimental study and implication for stability of Fe-rich olivine in the solar nebula. Geochim. Cosmochim. Acta 64, 939-955. 

HEN/RED] Henderson, C. M. B., Redfem, S. A. T., Smith, R. 1., Knight, K. S., Chamock, J. M., Composition and temperature dependence of cation ordering in Ni-Mg olivine solid solutions a time-of-flight neutron powder diffraction and EXAFS study. Am. Mineral, 86, (2001), 1170-1187. Cited on pages 239,438. 

Helgeson (1971,1972,1974) applied irreversible thermodynamics using q to the compositional variations in aqueous solution reacting with K-feldspar. Above arguments consider only feldspar dissolution. However, other silicate minerals (olivine, pyroxene etc.) react with ground water. For example, Mg-pyroxene and Mg-olivine dissolve by... 

For example, formations of talc (Mg6Si802o(OH)4) and serpentine (Mg3Si205(0H)4) between quartz and forsterite(Mg-olivine) (Mg2Si04) which initially contact with each other are calculated based on reaction-flow model (Fig. 3.12) (Lichtner et al. 1996). Abundances of talc and serpentine increase but those of quartz and forsterite decrease with time. Between forsterite and serpentine, tremolite and chlorite form (Fig. 3.13) (Nishiyama 1987). 

Bartholomew R. B. 1989. Interpretation of solution properties of Fe-Mg olivines and aqueous Fe-Mg chlorides from ion-exchange experiments American Mineralogist, 1A-, 37-49. 

Nafziger and Muan (1967) used this approach to determine the mixing properties of (Fe-Mg) olivine solid solutions by studying the exchange equilibrium ... 

Knowledge of the thermodynamic properties of (Fe,Mg)0 oxide solution and of the compositions of coexisting (Fe,Mg) oxide and (Fe, Mg) olivine solid solutions enable q to be... 

Before discussing equilibria (2) and (3) any further let us return to a more detailed description of method (a) using the examples of feldspar solid solutions and (Fe,Mg) olivine solid solutions. 

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