The magmatic system of the Klyuchevskaya group of volcanoes inferred from data on its eruptions, earthquakes, deformation, and deep structure

Fedotov, S.; Zharinov, N. A.; Gontovaya, L. I.

doi:10.1134/s074204631001001x

Cited by 81 publications

(71 citation statements)

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“…The presence of olivinite xenoliths and of gabbroids that compose the Upper Cretaceous intrusive units in ejecta from the zone of cinder cones implies the existence of intermediate chambers also at higher levels within the Upper Cretaceous volcanogenic-sedimentary rock sequence. Comparing the above with data on the structure of the Kamchatka lithosphere, we believe that these chambers must be at depths of 10-15 and 5 km, respectively (Balesta et al, 1976(Balesta et al, , 1984Moroz and Gontovaya, 2016;Nurmukhamedov et al, 2016;Fedotov et al, 2010). It is supposed that trachybasaltic and basaltic magmas that ascend from the deep-seated sources of their generation frequently came to a common intermediate chamber where they mixed.…”

Section: Resultsmentioning

confidence: 99%

The Ploskie Sopki volcanic massif: Geology, petrochemistry, mineralogy, and petrogenesis (Klyuchevskoi Volcanic Cluster, Kamchatka)

Flerov

Churikova

Anan’ev

2017

J. Volcanolog. Seismol.

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Abstract⎯This paper is concerned with the geological history and petrology of a major polygenic volcanic edifice dating back to Upper Pleistocene to Holocene time. This long-lived volcanic center is remarkable in that it combines basaltic and trachybasaltic magmas which are found in basaltic andesite and trachybasaltictrachyandesite series. The inference is that the coexisting parent magmas are genetically independent and are generated at different sources at depth in an upper mantle volume. The associated volcanic rocks have diverse compositions, stemming from a multi-stage spatio-temporal crystallization differentiation of the magmas and mixing of these in intermediate chambers. DOI: 10.1134/S0742046317040030INTRODUCTION The information on the Ploskie Sopki massif can be found to varying degrees of detail in (Sirin, 1968;Piip, 1956;Ermakov, 1977;Flerov and Ovsyannikov, 1991;Churikova, 1990Churikova, , 1993Churikova and Sokolov, 1993;Churikova et al., 2001Churikova et al., , 2012Churikova et al., , 2013. Our studies supplied considerable corrections to the interpretation of the volcanic history for the formation of the massif and the associated petrogenesis. The Ploskie Sopki massif (Fig. 1) is the largest polygenic (as to morphology and geology) volcanic edifice in the Klyuchevskoi Volcanic Cluster. It is made of the paired edifices of the Late Pleistocene Ushkovskii (3943 m) and Krestovskii (4108 m) stratovolcanoes. The summit part of Ushkovskii Volcano and part of Krestovskii are truncated by a 4.5-km × 5.5-km collapse caldera, which includes two cinder cones, Kherts and Gorshkov, and is filled with a glacier. Krestovskii Volcano is a fragment of the volcanic cone that has been spared by the collapse, and which makes up the N-NW-W steep wall of the collapse cirque. The slopes of the massif abound in cinder and cinder-lava cones due to parasitic eruptions at different hypsometric levels. Some of these are along the periphery of Ushkovskii Volcano, while most of the cones are confined to a narrow zone striking SSW-NNE-NE, which traverses the top of the massif and its slopes, and can be followed for a distance of 60 km, with the width varying between 6 and 8 km. One peculiar feature of the massif consists in the presence of normal and high alkalinity volcanic rocks within a single edifice, which

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Section: Resultsmentioning

confidence: 99%

The Ploskie Sopki volcanic massif: Geology, petrochemistry, mineralogy, and petrogenesis (Klyuchevskoi Volcanic Cluster, Kamchatka)

Flerov

Churikova

Anan’ev

2017

J. Volcanolog. Seismol.

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“…The source of the parental magma is a large melt body imaged geophysically near the Moho (Lees 2007). The current interpretation is that Bezymianny magmas further evolve dominantly through closedsystem fractionation in mid-crustal magma chambers (Ozerov et al 1997;Fedotov et al 2010;Almeev et al 2013a;Turner et al 2013), which may be transient in time (Koulakov et al 2013) as well as through short-term storage in a shallow crustal reservoir (Shcherbakov et al 2011;Turner et al 2013).…”

Section: Klyuchevskoy and Bezymianny Volcanic Systemsmentioning

confidence: 99%

“…Reconstruction of the volcanic structure of Klyuchevskoy based on geophysical data suggests that magma moves from the mantle and/or base of the crust to the surface through a narrow vertical conduit that lacks crustal magma chambers (Anosov et al 1978;Ozerov et al 1997Ozerov et al , 2007Lees et al 2007). An earthquake catalog and geodetic measurements show evidence for a shallow magma body approximately 3 km beneath Klyuchevskoy (Fedotov et al 2010). However, this shallow magma is located in "sedimentary" layers of young volcanic material (Fedotov et al 2010), which would not have a significant Pb isotope contrast from current eruptive products in the KG.…”

Section: Distinct Pb Isotope and Trace Element Signatures At Bezymianmentioning

confidence: 99%

“…An earthquake catalog and geodetic measurements show evidence for a shallow magma body approximately 3 km beneath Klyuchevskoy (Fedotov et al 2010). However, this shallow magma is located in "sedimentary" layers of young volcanic material (Fedotov et al 2010), which would not have a significant Pb isotope contrast from current eruptive products in the KG.…”

Section: Distinct Pb Isotope and Trace Element Signatures At Bezymianmentioning

confidence: 99%

“…Klyuchevskoy magmas experience some lower-crustal assimilation and fractional crystallization (AFC), but in general are transported through a well-developed vertical conduit system. Bezymianny magmas, however, undergo more extensive AFC processing in the lower crust (shown here with a larger region of deep AFC) and are stored at various depths in the upper crust [see Fedotov et al (2010) and Koulakov et al (2013) for crustal storage]. Bezymianny magmas also mix with more mafic melts unrelated to Klyuchevskoy that may feed Tolbachik volcano…”

Section: Fig 13mentioning

confidence: 99%

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Deciphering petrogenic processes using Pb isotope ratios from time-series samples at Bezymianny and Klyuchevskoy volcanoes, Central Kamchatka Depression

Kayzar

Nelson

Bachmann

et al. 2014

Contrib Mineral Petrol

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The Influence of Plumbing System Structure on Volcano Dimensions and Topography

2017

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Volcano morphology has been traditionally studied from a descriptive point of view, but in this work we took a different more quantitative perspective. Here we used volcano dimensions such as height and basal radius, together with the topographic profile as indicators of key plumbing system properties. We started by coupling models for the ascent of magma and extrusion of lava flows with those for volcano edifice construction. We modeled volcanic edifices as a pile of lavas that are emitted from a single vent and reduce in volume with time. We then selected a number of arc‐volcano examples to test our physical relationships and estimate parameters, which were compared with independent methods. Our results indicate that large volcanoes (>2,000 m height and base radius >10 km) usually are basaltic systems with overpressured sources located at more than 15 km depth. On the other hand, smaller volcanoes (<2,000 m height and basal radius <10 km) are associated with more evolved systems where the chambers feeding eruptions are located at shallower levels in the crust (<10 km). We find that surface observations on height and basal radius of a volcano and its lavas can give estimates of fundamental properties of the plumbing system, specifically the depth and size of the magma chamber feeding eruptions, as the structure of the magmatic system determines the morphology of the volcanic edifice.

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The magmatic system of the Klyuchevskaya group of volcanoes inferred from data on its eruptions, earthquakes, deformation, and deep structure

Cited by 81 publications

References 10 publications

The Ploskie Sopki volcanic massif: Geology, petrochemistry, mineralogy, and petrogenesis (Klyuchevskoi Volcanic Cluster, Kamchatka)

The Ploskie Sopki volcanic massif: Geology, petrochemistry, mineralogy, and petrogenesis (Klyuchevskoi Volcanic Cluster, Kamchatka)

Deciphering petrogenic processes using Pb isotope ratios from time-series samples at Bezymianny and Klyuchevskoy volcanoes, Central Kamchatka Depression

The Influence of Plumbing System Structure on Volcano Dimensions and Topography

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