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Upper Pliocene Acid Volcanic Rocks in the Upper Chegem and Lower Chegem Volcanic Highlands, North Caucasus

Authors
  • Myshenkova, M. S.1
  • Koronovsky, N. V.1
  • 1 Moscow State University, Moscow, 119991, Russia , Moscow (Russia)
Type
Published Article
Journal
Journal of Volcanology and Seismology
Publisher
Pleiades Publishing
Publication Date
Nov 01, 2021
Volume
15
Issue
6
Pages
463–482
Identifiers
DOI: 10.1134/S0742046321060075
Source
Springer Nature
Keywords
Disciplines
  • Article
License
Yellow

Abstract

AbstractThe geological, petrographic, and geochemical features detected in the Upper Pliocene acid volcanic rocks sampled in the Upper Chegem and Lower Chegem volcanic highlands provide evidence that the Upper Chegem volcanic rocks are not tuffs that have been subaerially transported from the Upper Chegem Highland; they came from several local centers. These results are in contradiction with the hypothesis of a pyroclastic origin for most Upper Pliocene acid volcanic rocks that compose the bulk of the Upper Chegem volcano-tectonic basin. These volcanic rocks are hypothesized to have resulted from the effusion of mobile lava flows. The overwhelming majority of the Lower Chegem, Upper Pliocene, acid volcanic rocks are of a pyroclastic origin, being among other formative factors due to precipitation and subsequent welding of material from short pyroclastic flows.

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