Recent tectonomagmatic reactivation of the Kolyuchino-Mechigmen zone of the Chukchi Peninsula from data on the composition of gases in hydrothermal springs

Thirty-three groups of thermal mineral springs in the Chukchi Peninsula are studied. The thermal fluids of the Kolyuchino-Mechigmen Zone (KMZ) show specific characteristics. The zone corresponds to recent depression with occurrences of basic volcanism and high seismicity. Characteristic features of...

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Veröffentlicht in:Geotectonics 2010-11, Vol.44 (6), p.529-540
Hauptverfasser: Polyak, B. G., Lavrushin, V. Yu, Cheshko, A. L., Prasolov, E. M., Kamensky, I. L.
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container_end_page 540
container_issue 6
container_start_page 529
container_title Geotectonics
container_volume 44
creator Polyak, B. G.
Lavrushin, V. Yu
Cheshko, A. L.
Prasolov, E. M.
Kamensky, I. L.
description Thirty-three groups of thermal mineral springs in the Chukchi Peninsula are studied. The thermal fluids of the Kolyuchino-Mechigmen Zone (KMZ) show specific characteristics. The zone corresponds to recent depression with occurrences of basic volcanism and high seismicity. Characteristic features of the gases in the springs of the KMZ include the predominance of carbon dioxide, high percentage of mantle-derived helium, enrichment of CO 2 in 13 C, admixture of nonatmospheric nitrogen, excess in 40 Ar and 15 N relative to the atmosphere, maximal depletion of thermal water in deuterium and heavy oxygen isotope, and the highest estimates of deep temperature in reservoirs of hydrothermal fluid. All these features indicate the contemporary ascent of a mantle diapir that supplied helium enriched in 3 He and thermal energy to the crust, thus provoking thermal metamorphism of rocks and degradation of permafrost.
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subjects Carbon dioxide
Deuterium
Diapirs
Earth and Environmental Science
Earth Sciences
Geochemistry
Geophysics
Helium
Magma
Metamorphism
Mineral springs
Oxygen isotopes
Permafrost
Plate tectonics
Soil degradation
Structural Geology
Thermal energy
Thermal water
Thermodynamics
title Recent tectonomagmatic reactivation of the Kolyuchino-Mechigmen zone of the Chukchi Peninsula from data on the composition of gases in hydrothermal springs
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