Eichelberger J.C.

Gavrilenko M.G.

Kyle P.R.

Ozerov A.Yu.

English

Institute of Volcanology and Seismology FEB RAS Repository

2006 Fall Meeting            Cite abstracts as Author(s) (2006), Title, Eos Trans. AGU,  87(52), Fall Meet. Suppl., Abstract xxxxx-xx 0800h V11A-0558 Petrological And Geochemical Characteristics Of Magmatic Melts At Gorely Volcano, Kamchatka, Russia  * Gavrilenko, M G max.gavrilenko@yahoo.com Institute of Volcanology and Seismology (RAS-FEB), 9 Piip Blvd. Kamchatka, Petropavlovsk, 683006 Russian Federation   Ozerov, A Y ozerov@ozerov.ru Institute of Volcanology and Seismology (RAS-FEB), 9 Piip Blvd. Kamchatka, Petropavlovsk, 683006 Russian Federation   Kyle, P R kyle@nmt.edu Dept of Earth & Environmental Science, NM Bureau of Geology and Mineral Resources New Mexico Tech, Socorro, NM 87801 United States   Eichelberger, J C eich@gi.alaska.edu University of Alaska Fairbanks, Alaska Volcano Observatory/ Geophysical Institute 903 Koyukuk Dr., Fairbanks, AK 99775-7320 United States   We conducted an integrated mineralogical-geochemical study of the structural complexities of all products from the Gorely volcanic edifice to determine genetic conditions. Gorely, in southern Kamchatka, is a large, long-lived shield-type volcano that is currently in an eruptive phase. Prior eruptions occurred in 1980 and 1984. Several complexes compose the overall volcanic structure: 1) ancient Pra-Gorely volcano which measures 20-25 km in diameter; 2) a 12 km diameter caldera; 3) thick stratum of ignimbrites totaling a volume of 100 km 3 ; 4) post-caldera eruption cinder cones; 5) modern edifice – "Young Gorely" composed of three large superimposed cones and 11 associated craters forming a NW-SE trending intra-caldera ridgeline; 6) a complex of 40 modern subsidiary cones on the slopes of "Young Gorely". We present materials of the Gorely volcano geological structure, peculiarities of its eruptive activity, new geochemical data, and results of crystal-phase microprobe investigations to define paragenetic relationships. Geochemical analysis typifies two series of evolution at Gorely. Pra-Gorely volcano is represented by a suite of compositions ranging from basalt to rhyolite, and contains Hi-Mg basalts (MgO about 10wt percent). Comparatively the "Young Gorely" edifice is composed of only basalt to andesite compositions. Here we present a reconstruction of the evolution of Hi-Mg melts within magma chambers and conduits and the differences in magmatic series generation of Pra-Gorely and "Young Gorely". Both volcanic series of Gorely volcano form genetic series with similar evolutionary stages. We suggest fractionation of an upper mantle peridotite as a common means to produce both series under different geodynamic conditions. The similarity of these two series indicates that the evolution of Gorely's melts is not due to the incorporation of crustal components.   8410 Geochemical modeling (1009, 3610) 8413 Subduction zone processes (1031, 3060, 3613, 8170) 8439 Physics and chemistry of magma bodies Volcanology, Geochemistry, Petrology [V] 2006 Fall Meeting  

Petrological and Geochemical Characteristics of Magmatic Melts at Gorely Volcano, Kamchatka, Russia

http://repo.kscnet.ru/3492/1/Ozerov_2006_AGU_FM_2.pdf

Petrological and Geochemical Characteristics of Magmatic Melts at Gorely Volcano, Kamchatka, Russia

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