GENESIS OF THE YARIKÇI HYDROTHERMAL CLAY DEPOSIT WITHIN THE MESOZOIC METAMORPHIC UNITS, MİHALIÇÇIK, ESKİŞEHİR, TURKEY
| Autor: | Hülya Erkoyun, Selahattin Kadir, Tacit Külah |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Muscovite
Geochemistry Soil Science 020101 civil engineering 02 engineering and technology Pyroxene engineering.material 021001 nanoscience & nanotechnology Feldspar Hydrothermal circulation 0201 civil engineering chemistry.chemical_compound chemistry Geochemistry and Petrology visual_art Illite Earth and Planetary Sciences (miscellaneous) engineering visual_art.visual_art_medium Kaolinite 0210 nano-technology Clay minerals Chlorite Geology Water Science and Technology |
| Zdroj: | Clays and Clay Minerals. 68:553-579 |
| ISSN: | 1552-8367 0009-8604 |
| Popis: | Hydrothermal alteration led to development of the Yarikci clay deposit within the Mesozoic chlorite-, muscovite-, chlorite-muscovite-schist, and garnet-graphite phyllite units along NW–SE- and N–S-trending faults in Mihaliccik in western central Anatolia. The geological, mineralogical, and geochemical characteristics and genesis of this economically important clay deposit have not been examined in detail previously. The present study has attempted to fill this gap. Green smectitic and cream kaolinitic claystones are abundant with smaller amounts of gray illite, dark brown Fe oxides, and silica phases occurring as stockwork/fracture infill and stain/coating. These units are covered by a dark, hard, sharp-edged, and thick silica cap. Metamorphic units exhibit cataclastic texture due to tectonic activities. Muscovite is mostly degraded to kaolinite, and feldspars show sericitization and argillization. Kaolinite typically has a platy form with irregular margins and locally sub-rounded, book-like texture suggesting hydrolysis during the hydrothermal injections. The association of Fe oxides, cristobalite/tridymite/quartz, gypsum/anhydrite, and jarosite are indicative of intense hydrothermal activities and development of kaolinite under acidic geochemical conditions. The local enrichment of SiO2, Fe2O3, S, Cu, and Au also supports this suggestion. The leaching of Sr, Rb, Ba, and Zr, and the slight increase in LREE/MREE+HREE ratios together with the negative Eu and Ce anomalies suggest the selective dissolution of muscovite, garnet, feldspar, and pyroxene by the hydrothermal fluids. Thus, abundant claystones of smectite and kaolinite were formed via the increase in Al+Fe+Mg/Si and Al±Fe/Si ratios in the alkaline and acidic environment, respectively, under the tectonic control of hydrothermal activity as seen in the alteration of chlorite, muscovite, and feldspar in metamorphic units. |
| Databáze: | OpenAIRE |
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