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Physicochemical parameters of crystallization of melts in intermediate suprasubduction chambers (by the example of Tolbachik and Ichinskii volcanoes, Kamchatka Peninsula)

N. L. Dobretsov, V. A. Simonov, A. V. Kotlyarov, R. Yu. Kulakov and N. S. Karmanov
Physicochemical parameters of crystallization of melts in intermediate suprasubduction chambers (by the example of Tolbachik and Ichinskii volcanoes, Kamchatka Peninsula)
Russian Geology and Geophysics (July 2016) 57 (7): 993-1015

Abstract

In study of plagioclases, amphiboles, and melt inclusions, we have determined the physicochemical parameters of crystallization of melts in the intermediate suprasubduction chambers of volcanoes representing different types of subduction magmatism on the Kamchatka Peninsula: the young basaltic systems of Tolbachik Volcano (Klyuchevskaya group) and ancient Ichinskii Volcano (Sredinnyi Ridge) with alternating basaltic and felsic eruptions. For Tolbachik Volcano, we have found that plagioclase lapilli formed from basaltic melts at 1075-1115 degrees C and low (< 1 kbar) pressures at depths of 2-3 km. Andesite minerals crystallized within a wider range of temperatures and pressures (1220-1020 degrees C and 3.3-1.6 kbar) in an intermediate chamber at depths of < 10 km. The melts were generated in basaltic magma chambers (detected well by geophysical methods at depths of 18-20 km) with minimum temperatures of approximately 1290 degrees C. For Ichinskii Volcano, three levels of intermediate chambers are distinguished. Andesites formed at depths of < 23 km at < 1225 degrees C. Dacitic melts were generated from an intermediate chamber (14 km) at 1135-1045 degrees C as a result of differentiation of andesitic magmas. Dacites formed in the uppermost horizons (9-3 km) at 1130-1030 degrees C. Despite the similarity between differentiation processes in the intermediate chambers of the Kamchatka volcanoes, each volcano is characterized by specific magmatism. The lavas of basaltic volcanoes (Tolbachik) and those of andesitic volcanoes (Ichinskii) differ in genesis and differentiation.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 57
Serial Issue: 7
Title: Physicochemical parameters of crystallization of melts in intermediate suprasubduction chambers (by the example of Tolbachik and Ichinskii volcanoes, Kamchatka Peninsula)
Affiliation: Russian Academy of Sciences, Siberian Division, A. A. Trofimuk Institute of Petroleum Geology and Geophysics, Novosibirsk, Russian Federation
Pages: 993-1015
Published: 201607
Text Language: English
Publisher: Allerton Press, New York, NY, United States
Accession Number: 2019-005478
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Based on Publisher-supplied data
N56°01'00" - N56°04'60", E160°35'60" - E160°40'00"
Secondary Affiliation: Russian Academy of Sciences, V. S. Sobolev Institute of Geology and Mineralogy, RUS, Russian FederationNovosibirsk State University, RUS, Russian Federation
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
Update Code: 201906
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