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Strukturveränderungen von Tonmineralien unter verschiedenen thermodynamischen Bedingungen (III). Transformative Umwandlungen von Mineralen der Kaolinit‐Gruppe unter erhöhtem Druck bei Anwesenheit von mineralisierenden Lösungen
Author(s) -
FrankKamenetzkij V. A.,
Kotov N. V.,
Goilo E. A.,
Schitov V. A.
Publication year - 1970
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19700050111
Subject(s) - montmorillonite , population , silicate , octahedron , crystallography , chemistry , hydrothermal circulation , materials science , mineralogy , geology , crystal structure , composite material , demography , organic chemistry , sociology , seismology
In the earlier papers (I and II, Frank‐Kamenetzkij et al., 1966, 1968) data regarding the structural and facial changes in kaolin group minerals under conditions of interaction with hydrothermal chloride solutions of K, Na, Ca, Mg at P H 2 O= 900 kg cm −2 . T = 200–500°C were dis‐ cussed. In the present paper the results of these investigations are summed up. The diffractometrical, electronographic and electron microscopic investigations of initial, intermedial and final phasis mainly of layered silicate and aluminous silicates show a cristallographic inheritance of structures during the transformation of kaolinite into montmorillonite, micas and mixed layered facies (rectorit, tosudit etc.) This is seen in the retention of the main features in the basal plane, in the character of population of the octahedral positions, in the tendency to retain the sequence of alternation and imposition of layers (polytype), and in the processes of deformation that the structures of the initial minerals undergo during such changes. The wide participation of ordered and disordered mixed‐layered structures in these reactions is the result of structural changes by transformatical means. At the same time, the chemical nature of the medium exerts considerable influence on the course and nature of the resulting structures. Thus, the mechanism of transformational thermal changes of aluminium silicates, which is already known for “dry‐systems”, is observed to a great extent in the case of complex polycomponental systems under H 2 O pressure and is characterised by the specific individual features discussed in this paper.