The Elbrus Volcanic Center: New Features of EPR Dating of Rocks

—The restoration of the evolution of the Elbrus Volcanic Center (EVC) is of great importance for predicting possible eruptions. Some stages of its development occur in a time interval that is difficult to measure by conventional radioisotope techniques. In this regard, in this work, we studied the p...

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Published inMoscow University geology bulletin Vol. 77; no. 4; pp. 418 - 425
Main Authors Gurbanov, A. G., Koshchug, D. G., Gazeev, V. M., Leksin, A. B., Vyatkin, S. V., Dokuchaev, A. Y.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.08.2022
Springer Nature B.V
Subjects
Analytical methods
Convergence
Earth and Environmental Science
Earth Sciences
Geology
Lava
Lava flows
Quartz
Radiation
Radiocarbon dating
Radioisotopes
Restoration
Rocks
quartz
dating
Elbrus
radiation centers
electron paramagnetic resonance
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Summary:—The restoration of the evolution of the Elbrus Volcanic Center (EVC) is of great importance for predicting possible eruptions. Some stages of its development occur in a time interval that is difficult to measure by conventional radioisotope techniques. In this regard, in this work, we studied the possibility of using the dating method by radiation centers in quartz for which the concentration was measured with electron paramagnetic resonance (EPR) spectroscopy. When dating lava flows with an age of less than 50 ka, there is a good convergence of the results obtained by the EPR dating, radiocarbon, and comparative geomorphological methods. Due to the low thermal stability of radiation centers in quartz, in some cases, the measured values of age reflect a later thermal impact of overlying lava flows or intrusive bodies. The improved technique of EPR dating with intermediate annealing led to results that have better convergence with the data obtained by the 40 Ar/ 39 Ar and K–Ar methods for rocks older than 50 ka.
ISSN:0145-8752
1934-8436
DOI:10.3103/S0145875222040068