FORMATION AND STABILITY OF ENDMEMBER ILLITE: II. SOLID EQUILIBRATION EXPERIMENTS AT 100 TO 250°C AND PV,SOLN
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dc.contributor.author | Yates D.M. | |
dc.contributor.author | Rosenberg P.E. | |
dc.date.accessioned | 2020-12-16T02:21:32Z | |
dc.date.available | 2020-12-16T02:21:32Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=273708 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1997, , 15, 3135-3144 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20863 | |
dc.description.abstract | One of several natural muscovites or illites, kaolinite, and quartz or amorphous silica were equilibrated in 2 M KCl/HCl solutions in hydrothermal experiments designed to investigate the stability, composition, and structure of endmember illite at 100 to 250°C. Equilibrium solution compositions determined in previously conducted low solution-to-solid ratio experiments were used in these experiments. High solution-to-solid ratios (120:1) in the present study served to bring about changes in solids that could be characterized by powder XRD and TEM/ATEM.Average alkali-site occupancies of muscovite starting materials decreased from 0.97 +/- 0.04 to 0.88 +/- 0.05K/O10(OH)2, reflecting an increase in the (Si/Al)iv ratio and a decrease in K for all muscovites, as well as a decrease in Mg for a phengitic muscovite. The illites, with initial alkali-site occupancies close to 0.88K/O10(OH)2, remained unchanged during equilibration.The formation of mica-like phases with a composition of 0.88 K/O10(OH)2 in this study confirms the results of previous solution equilibration experiments in which a solubility-controlling phase of the same composition was inferred. The retrograde reaction, muscovite-to-illite, represents a reversal of the commonly observed prograde transition from smectite-to-illite. The change in muscovite compositions to 0.88K/O10(OH)2, while illite (0.87 +/- 0.03K) compositions remained unchanged, suggests that end-member illite [0.88K/O10(OH)2] is stable with respect to muscovite between 100 and 250°C under the conditions of this study. | |
dc.title | FORMATION AND STABILITY OF ENDMEMBER ILLITE: II. SOLID EQUILIBRATION EXPERIMENTS AT 100 TO 250°C AND PV,SOLN | |
dc.type | Статья |
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