Geodynamic Specifics in the Formation of Ultra-High-K Ignimbrites in Armenia

The northwestern part of the Sevan–Shirak structural formation zone of the Lesser Caucasus contains ultra-high-K siliceous ignimbrites dating back to the Late Eocene–start of Early Oligocene (?), which associate with high-K volcanics of the calc-alkaline and shoshonite series. During Eocene–Oligocen...

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Bibliographic Details
Published in:Journal of volcanology and seismology 2024-10, Vol.18 (5), p.459-467
Main Author: Kurchavov, A. M.
Format: Article
Language:English
Subjects:
Continental crust
Earth and Environmental Science
Earth Sciences
Eocene
Fluids
Geochemistry
Geology
Geophysics/Geodesy
Island arcs
Oligocene
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Summary:The northwestern part of the Sevan–Shirak structural formation zone of the Lesser Caucasus contains ultra-high-K siliceous ignimbrites dating back to the Late Eocene–start of Early Oligocene (?), which associate with high-K volcanics of the calc-alkaline and shoshonite series. During Eocene–Oligocene time the Sevan–Shirak zone was an ensialic island arc with a Hercynian metamorphic basement. The formation of high-K and especially ultra-high-K rocks was due to the effects of mantle fluids on the continental crust.
ISSN:0742-0463
1819-7108
DOI:10.1134/S0742046324700726