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Karymshina, a giant supervolcano caldera in Kamchatka: Boundaries, structure, volume of pyroclastics

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Abstract

Data on a caldera discovered in 2006 are reported. The caldera formed in southern Kamchatka during Eopleistocene time (1.2 to 1.5 Ma). The caldera boundaries have been reconstructed and its dimensions determined (approximately 15 × 25 km). An uplifted block has been identified in the northwestern part of the caldera, the block is considered to be the result of emplacement of viscous rhyolite magmas at a later time (approximately 0.5–0.8 Ma), that is, as a resurgent uplift. We have reconstructed the boundaries of a large lacustrine basin that formed in the caldera after the appearance of the resurgent uplift. Calculations are provided yielding the volume of the pyroclastics ejected during caldera generation. It is shown that the caldera-forming eruption was a major one in Kamchatka in regard to its volume of ejected material, and ranks as a major eruption worldwide. We examined the structural controls of present-day hydrothermal systems and mineral occurrences situated in the area of study to demonstrate their relations to the caldera and the resurgent uplift.

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Authors and Affiliations

  1. Institute of Volcanology and Seismology, Far East Division, Russian Academy of Sciences, Petropavlovsk-Kamchatskii, 683006, Russia

    V. L. Leonov & A. N. Rogozin

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  1. V. L. Leonov
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  2. A. N. Rogozin
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Original Russian Text © V.L. Leonov, A.N. Rogozin, 2007, published in Vulkanologiya i Seismologiya, 2007, No. 5, pp. 14–28.

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Leonov, V.L., Rogozin, A.N. Karymshina, a giant supervolcano caldera in Kamchatka: Boundaries, structure, volume of pyroclastics. J. Volcanolog. Seismol. 1, 296–309 (2007). https://doi.org/10.1134/S0742046307050028

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