Controls on Associations of Clay Minerals in Phanerozoic Evaporite Formations: An Overview
| Autor: | Sofiya P. Hryniv, Tadeusz Marek Peryt, Serhiy Vovnyuk, Fanwei Meng, Yaroslava Yaremchuk |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
inorganic chemicals
lcsh:QE351-399.2 010504 meteorology & atmospheric sciences Evaporite Phanerozoic Geochemistry engineering.material 010502 geochemistry & geophysics complex mixtures 01 natural sciences chemistry.chemical_compound medicine Kaolinite Chlorite 0105 earth and related environmental sciences pyroclastic material lcsh:Mineralogy seawater chemical type Palygorskite Geology Authigenic Geotechnical Engineering and Engineering Geology clay minerals marine evaporites chemistry Illite engineering Clay minerals medicine.drug |
| Zdroj: | Minerals Volume 10 Issue 11 Minerals, Vol 10, Iss 974, p 974 (2020) |
| ISSN: | 2075-163X |
| DOI: | 10.3390/min10110974 |
| Popis: | Information on the associations of clay minerals in Upper Proterozoic and Phanerozoic marine evaporite formations suggests that cyclic changes in the (SO4-rich and Ca-rich) chemical type of seawater during the Phanerozoic could affect the composition of associations of authigenic clay minerals in marine evaporite deposits. The vast majority of evaporite clay minerals are authigenic. The most common are illite, chlorite, smectite and disordered mixed-layer illite-smectite and chlorite-smectite all the clay minerals are included regardless of their quantity. Corrensite, sepiolite, palygorskite and talc are very unevenly distributed in the Phanerozoic. Other clay minerals (perhaps with the exception of kaolinite) are very rare. Evaporites precipitated during periods of SO4-rich seawater type are characterized by both a greater number and a greater variety of clay minerals&mdash smectite and mixed-layer minerals, as well as Mg-corrensite, palygorskite, sepiolite, and talc, are more common in associations. The composition of clay mineral association in marine evaporites clearly depends on the chemical type of seawater and upon the brine concentration in the evaporite basin. Along with increasing salinity, aggradational transformations of clay minerals lead to the ordering of their structure and, ideally, to a decrease in the number of minerals. In fact, evaporite deposits of higher stages of brine concentration often still contain unstable clay minerals. This is due to the intense simultaneous volcanic activity that brought a significant amount of pyroclastic material into the evaporite basin intermediate products of its transformation (in the form of swelling minerals) often remained in the deposits of the potassium salt precipitation stage. |
| Databáze: | OpenAIRE |
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