Upper mantle structure in the ocean-continent transition zone: Kamchatka

Gontovaya, L. I.; Popruzhenko, S. V.; Nizkous, Irina

doi:10.1134/s0742046310040020

Cited by 14 publications

(8 citation statements)

References 7 publications

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“…The existence of such a source in the upper mantle is corroborated by seismic observations. It is clearly seen in seismotomographic velocity images (Gontovaya et al, 2004(Gontovaya et al, , 2010Fedotov et al, 2010;Kulakov et al, 2016). It should be noted that these results provide no evidence of a direct supply of magma from the lower crustal source onto the ground surface.…”

Section: The Geochemical Features Of Moderate Potassium Magnesian Andmentioning

confidence: 98%

On the Magma Chambers beneath Klyuchevskoi Volcano, Kamchatka

Khubunaya

Gontovaya

Sobolev

et al. 2018

J. Volcanolog. Seismol.

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⎯Numerous summit and parasitic eruptions of moderate potassium magnesian and high-alumina basalts and basaltic andesites, their mineralogic and geochemical features, and the composition of in situ chilled melt inclusions in the olivine of cinder lapilli discharged by Klyuchevskoi Volcano all provide evidence of the presence of magma chambers beneath the volcano. This is also supported by a dualism in the variation of CaO and Al 2 O 3 concentrations in olivine and clinopyroxene during crystallization. The mineralogic features in the high-alumina basalts that were discharged by all parasitic eruptions of Klyuchevskoi provide evidence of magnesian magma being emplaced from a deeper chamber into a shallow high-alumina chamber. The distribution of incoherent elements in the volcano's magnesian and aluminiferous rocks shows that they came from a single mantle source. The geochemical and mineralogic data are in good agreement with the results of geophysical surveys that concern the structure and properties of the lithosphere beneath Klyuchevskoi.

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Section: The Geochemical Features Of Moderate Potassium Magnesian Andmentioning

confidence: 98%

On the Magma Chambers beneath Klyuchevskoi Volcano, Kamchatka

Khubunaya

Gontovaya

Sobolev

et al. 2018

J. Volcanolog. Seismol.

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“…Так, несколько пунктов МТЗ профиля «Южный» располагаются вблизи вулканов Горелый, Мутновский и Ходутка. По данным сейсмической томографии [Gontovaya et al, 2010] установлено, что земная кора содержит аномалии, в пределах которых отмечается понижение сейсмической скорости на 4-6 % относительно фоновых значений сейсмических скоростей.…”

Section: исследованияunclassified

“…Выделенная проводящая зона может быть связана с наличием в разрезе магматических расплавов и гидротермальных растворов. Стоит отметить, что ранее по данным сейсмической томографии под вулканом Горелый была выделена зона пониженной сейсмиче-ской скорости [Gontovaya et al, 2010], с которой согласуется выделенная в настоящем исследовании низкоомная аномалия. Область пониженного удельного электрического сопротивления также отражена в пониженной интенсивности поля силы тяжести.…”

Section: геоэлектрические разрезы восточного побережья южной и севернunclassified

“…1 -зоны, выделенные на первом этапе конформного осреднения кривых МТЗ; 2 -блоки, выделенные на втором этапе конформного осреднения кривых МТЗ; 3 -значения удельного электрического сопротивления в Ом·м; 4 -область пониженных сейсмических скоростей [Gontovaya et al, 2010]; 5 -вулканы [Litvinov et al, 1999]; 6 -график поля силы тяжести [Декин, Зубин, 1976]; 7график аномального магнитного поля [Rivosh, 1963]. На вставке (в) зеленой линией показано расположение регионального профиля «Южный», черной линией показано положение осей глубоководных желобов (К-К -Курило-Камчатский, А -Алеутский) [Seliverstov, 2009].…”

Section: геоэлектрические разрезы восточного побережья южной и севернunclassified

“…-zones identified at the first stage of conformal averaging of the MTS curves; 2 -blocks identified at the second stage of conformal averaging of the MTS curves; 3 -values of specific electrical resistance (Ohm·m); 4 -region of low seismic velocities[Gontovaya et al, 2010]; 5 -volcanoes[Litvinov et al, 1999]; 6 -gravity curve[Dekin, Zubin, 1976]; 7 -magnetic anomaly curve[Rivosh, 1963]. Inset (в): green line -regional profile Yuzhny, black line -axes of deep-sea troughs (K-K -Kuril-Kamchatka, A -Aleutian)[Seliverstov, 2009].Geodynamics & Tectonophysics 2018 Volume 9 Issue 2 Pages 489-501…”

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confidence: 99%

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On the Geoelectrical Difference Between the Kuril‐kamchatka and Bering Sea Segments of the Pacific Transition Zone

Мороз¹,

Самойлова²

2018

Geodin. tektonofiz.

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The data from the regional magnetotelluric sounding profiles Severny and Yuzhny (northern and southern, respectively) was analyzed and interpreted. The profiles were located on several sites of the eastern coast of Kamchatka, which differ in tectonic structure and geodynamic conditions. The southeastern region covers the Kuril-Kamchatka segment of the Pacific transition zone, which corresponds to the active continental margin, while the northeastern region includes the passive continental margin. Geoelectrical sections were obtained along the regional profiles to a depth of about 80 km. The identified anomalies of electrical conductivity were compared with the data obtained by other geophysical methods (specifically, the data on gravity and anomalous magnetic fields). The comparative analysis of the geoelectrical sections shows that electrical conductivity changes gradually in the northeastern region, while the structure of the southeastern region is represented by blocks differing in geoelectrical properties. The conducting horizon of the lithosphere lies at different depths in different parts of East Kamchatka. The southeastern section shows the roof of the lithospheric layer closest to the land surface. R e c e n t G e o d y n a m i c s RESEARCH ARTICLE

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