ВАК 1.6 УДК 55 ГРНТИ 37.01 ОКСО 05.00.00 ББК 26 ТБК 63 BISAC SCI УДК 552 УДК 550.34 УДК 550.383 ГРНТИ 37.15 ГРНТИ 37.25 ГРНТИ 37.31 ГРНТИ 38.01 ГРНТИ 36.00 ГРНТИ 37.00 ГРНТИ 38.00 ГРНТИ 39.00 ГРНТИ 52.00

FELSIC TUFFS FROM THE UPPER MIOCENE OF THE EASTERN PARATETHYS (GEORGIA, KAKHETI): COMPOSITION, SECONDARY ALTERATIONS, AND CORRELATION WITH VOLCANIC ERUPTIONS Felsic Tuffs from the Upper Miocene of the Eastern Paratethys (Georgia, Kakheti): Composition, Secondary Alterations, and Correlation with Volcanic Eruptions

Опубликовано в Russian Journal of Earth Sciences · Том 26, Номер 3, 2026 · Номер статьи: ES3018 · Рубрика: ОРИГИНАЛЬНЫЕ СТАТЬИ
DOI: https://doi.org/10.2205/2026es001142 · EDN: WTSHUY
Получено: 15.06.2026 Одобрено: 30.08.2026 Опубликовано: 07.09.2026 Язык публикаций: ENG
This study presents new data on the secondary alterations and composition of felsic tuffs (65.38–66.12 wt.% SiO2 for whole rocks and 75.94–79.98 wt.% SiO2 for volcanic glasses) from Upper Sarmatian and Maeotian-Pontian continental sedimentary rocks of the Udabno Upper Miocene section (Kakheti, Eastern Georgia, Eastern Paratethys). These rocks show varying degrees of secondary alterations, characterized by the predominant development of smectites and zeolites (analcime and heulandite/clinoptilolite). Smectite was formed in the initial stages of secondary alterations, preceding intensive zeolitization. The Na-zeolites (analcime) are characteristic of Na-rich Upper Sarmatian pyroclastics, while the Ca-Na-zeolites (heulandite/clinoptilolite) are characteristic of Maeotian-Pontian pyroclastics with a high Ca content. Secondary alterations were accompanied by removal of K+ from volcanic material. Despite secondary alterations, the composition of the studied volcanic material to some extent reflects the characteristics of the initial pyroclastics. The source of Upper Sarmatian pyroclastics could be volcanic eruptions that occurred up to 7.65 Ma. The MaeotianPontian tuff is characterized by an association with phenocrysts of the minerals: clinopyroxene, orthopyroxene, amphibole, and plagioclase (Cpx-Opx-Amp-Pl). This pyroclastic material is most likely comparable to the volcanic rocks of the Goderdzi suite, reflecting episodes of eruptions in the Erusheti highland (southern Georgia) from ∼7.5 to 7.0 Ma.
felsic tuffs, secondary alterations, zeolitization, volcanic eruptions, Upper Miocene, Eastern Paratethys, Georgia
Финансирование
This research was funded by the Russian Science Foundation (Grant No. 26-17- 00028) for Y. V. R., the budgetary funding of the Geophysical Center of RAS, adopted by the Ministry of Science and Higher Education of the Russian Federation (Project No. 075- 00444-26-00) for A. A. O., the Shota Rustaveli National Science Foundation of Georgia (Grant No. FR-21-1979) for K. P. K., and the Higher Education and Science Committee of the Republic of Armenia within the framework of basic funding (Contract No. 1-11/26- IS/IGES) for J. K. K. The authors are grateful to Alena Rybkina for her great organizational work.
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