DOCSLIB.ORG

"Constraints on the Potential Subsurface Area of Disruption

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
CONSTRAINTS ON THE POTENTIAL SUBSURFACE AREA OF DISRUPTION ASSOCIATED WITH YUCCA MOUNTAIN REGION BASALTIC VOLCANOES Prepared for Nuclear Regulatory Commission Contract NRC-02-93-005 Prepared by Brittain Hill Center for Nuclear Waste Regulatory Analyses San Antonio, Texas November 1996 3/193 ABSTRACT Determining the subsurface area that a basaltic volcano can disrupt is a key parameter in calculating the amount of high-level radioactive waste that conceivably can be transported into the accessible environment. Although there is evidence that some Quaternary Yucca Mountain region (YMR) volcanoes disrupted anomalously large amounts of subsurface rock, the volume of disruption cannot be calculated directly. An analog volcanic eruption at Tolbachik volcano in Kamchatka, however, provides critical constraints on the subsurface area potentially disrupted by basaltic cinder cones. During a 12 hr period of the 1975 Tolbachik eruption, 2.8x10 6 m3 of subsurface rock was brecciated and ejected from the volcano. Using geologic and geometric constraints, this volume represents a circular diameter of disruption of 49±7 m. An unusual type of volcanic bomb was produced during this disruptive event, which contains multiple subsurface rock types that each show a range in thermal effects. These bombs represent the mixing of different stratigraphic levels and significant distances outward from the conduit during a single event. The same type of unusual volcanic bomb is found at Lathrop Wells and Little Black Peak volcanoes in the YMR. In addition, Lathrop Wells and to a lesser extent Little Black Peak have anomalously high subsurface rock-fragment abundances and are constructed of loose, broken tephra. These characteristics strongly suggest that subsurface disruptive events analogous to that at 1975 Tolbachik occurred at these YMR volcanoes. Rock fragment types, stratigraphic relationships, and geophysical data indicate Lathrop Wells disrupted a 0.5-2-km-thick crustal section, which is comparable to the thickness disrupted at 1975 Tolbachik. The volume of Lathrop Wells is nearly identical to 1975 Tolbachik. Because the volume of disrupted subsurface rock is probably directly related to eruption volume, Lathrop Wells likely disrupted a subsurface volume similar to 1975 Tolbachik. Thus, the subsurface conduits of future YMR basaltic eruptions may have the potential to widen on the order of 49±7 m in diameter. Conduit response to stress anisotropy in the disturbed geologic setting of the proposed repository site may result in an ellipsoidal cross sectional area with major axis length greater than 47±7 m. ii * m CONTENTS Section Page FIGURES ............................................................. iv TABLES ............................................................... v ACKNOWLEDGMENTS . ................................................... vi QUALITY OF DATA . ..................................................... vi 1 INTRODUCTION . .................................................... 1 2 TOLBACHIK-YUCCA MOUNTAIN REGION VOLCANO ANALOGY ..... .......... I 3 1975 TOLBACHIK ERUPTION ........... ................................ 4 4 WHITE-ASH DEPOSIT . ................................................. 6 5 WHITE-ASH EVENTS IN THE YUCCA MOUNTAIN REGION ..... ............... 9 6 SUBSURFACE AREA OF DISRUPTION ..................................... 9 7 CONCLUSIONS . .................................................... 11 8 REFERENCES ........................................................ 13 iii FIGURES Figure Page I Location map for the 1975 Tolbachik eruption. Shaded 1975 volcanoes are Cone I (1), Cone 11 (2), and Southern Cone (S) ............... ................. 2 2 A) Comparison of 1975 Tolbachik Cone I with Lathrop Wells volcano, Yucca Mountain Region. Lathrop Wells lavas are thicker than Cone I whereas Tolbachik lavas flowed down a steeper topographic gradient ......................... 5 3 Xenolith bombs for 1975 Tolbachik Cone I (A-C), Lathrop Wells (D-E), and Little Black Peak (F) .... 8 4 Diagram of subsurface disruption associated with white-ash eruption at Tolbachik Cone I. Note horizontal scale is twice vertical scale ................................ 11 iv TABLES Table Page I Average composition and viscosity of basaltic magmas from the Yucca Mountain Region and 1975 Tolbachik eruption .................... 3 2 Calculation of the subsurface area disrupted during the 1975 Tolbachik white-ash phase of the Cone I eruption ............... 12 v * *0 d/3 ACKNOWLEDGMENTS Philip Doubik, State University of New York, Buffalo, generously provided initial results from his research on the petrology of Tolbachik white-ash deposits and contributed significantly to the 1994 field studies in Kamchatka. Yuri Doubik and Alexander Ovsyannikov of the Institute for Volcanic Geology and Geochemistry, Petropavlovsk-Kamchatsky, also made substantial contributions to the field research reported herein. Discussions with Charles Connor, Jim Luhr, Steve Self, and George Walker also helped to solidify many of the relationships between white-ash, xenolith bombs, and Yucca Mountain Region eruption processes. Detailed reviews by Charles Connor, Pat Mackin, and Wes Patrick improved the technical content and presentation of this report. This report was prepared to document work performed by the Center for Nuclear Waste Regulatory Analyses (CNWRA) for the Nuclear Regulatory Commission (NRC) under Contract No. NRC-02-93-005. The activities reported here were performed on behalf of the NRC. The report is an independent product of the CNWRA and does not necessarily reflect the views or regulatory position of the NRC. QUALITY OF DATA DATA: CNWRA-generated original data contained in this report meets quality assurance requirements described in the CNWRA Quality Assurance Manual. Sources for other data should be consulted for determining the level of quality for those data. vi 1 INTRODUCTION Determining the subsurface area that a volcano can disrupt is a key parameter in calculating the amount of high-level radioactive waste (HLW) that can be conceivably transported into the accessible environment. This parameter cannot be measured at Yucca Mountain region (YMR) volcanoes, although there is direct evidence that anomalously large amounts of subsurface rock have been disrupted in some Quaternary eruptions (e.g., Crowe et al., 1986). Studies of historically active basaltic volcanoes that are analogous to YMR volcanoes can provide critical data and insights into igneous processes that can affect repository performance. This report summarizes results of Center for Nuclear Waste Regulatory Analyses (CNWRA) research at Tolbachik volcano in Kamchatka, Russia, where the process of subsurface disruption was well documented during the 1975 eruption. The 1975 Tolbachik eruption is closely analogous to YMR volcanism and this analogy is also documented in this report. Deposits from the 1975 Tolbachik eruption are compared to similar deposits at Lathrop Wells and Little Black Peak volcanoes in the YMR, and the implications for the area of subsurface disruption are explored. 2 TOLBACHIK-YUCCA MOUNTAIN REGION VOLCANO ANALOGY The 1975 Tolbachik eruption occurred in a Holocene cinder cone field on the distal southern flanks of Ostry and Plosky Tolbachik stratovolcanoes, which are part of the active Klyuchevskoy volcanic complex in the Kamchatka volcanic arc (Figure 1). Although the Kamchatka volcanic arc is regionally distinct from the tectonic setting of the Basin and Range Province, these regional tectonic differences do not affect the local processes of basaltic magma ascent and eruption. Like the YMR, this part of the Kamchatka volcanic arc is dominated by local extensional tectonic features. Tolbachik volcanoes are located in the central part of an intra-arc graben containing predominantly northeast-trending faults and volcano alignments (Figure 1). Graben subsidence during the Plio-Quatemary resulted in deposition of approximately 1.2 km of mafic volcanic rock upon several kilometers of volcanically derived sediments underneath the Tolbachik volcanoes (Balesta et al., 1983). Resistivity studies (Balesta et al., 1984) and the distribution of springs indicate depth to the water table of 500-800 m beneath the site of the 1975 eruption. Equilibration depth and source material can directly affect the degassing history of the magma, which relates to eruption explosivity. The basaltic magma from the 1975 Tolbachik eruption was derived from melting of lithospheric mantle, which then ponded near the base of the crust at approximately 40 km (Balesta et al., 1984; Volynets et al., 1983; Flerov et al., 1984). Quatemary basalts of the YMR also were derived from compositionally similar mantle material and last equilibrated at 30-40 km, at or slightly below the base of the crust (Vaniman et al., 1982; Brocher et al., 1993). Thus, the 1975 Tolbachik and YMR magmas most likely had similar equilibration depths, volatile contents, and ascent histories. The Theological characteristics of magma directly affect volatile release and thus explosivity of volcanic eruptions (e.g., Williams and McBirney, 1979). Basalts from the 1975 Tolbachik eruption and Quaternary YMR have very similar chemical composition and mineral abundances. These data are summarized in Table 1. Magma densities calculated with partial molar volume methods of Lange and Carmichael (1987) and Lange (1994) are nearly identical for these basalts (Table 1). Using the methods of Shaw (1972) and Pinkerton and Stevenson (1992), viscosities of these
Load more

Recommended publications
  • A Dangling Slab, Amplified Arc Volcanism, Mantle Flow and Seismic Anisotropy in the Kamchatka Plate Corner
    AGU Geodynamics Series Volume 30, PLATE BOUNDARY ZONES Edited by Seth Stein and Jeffrey T. Freymueller, p. 295-324 1 A Dangling Slab, Amplified Arc Volcanism, Mantle Flow and Seismic Anisotropy in the Kamchatka Plate Corner Jeffrey Park,1 Yadim Levin,1 Mark Brandon,1 Jonathan Lees,2 Valerie Peyton,3 Evgenii Gordeev ) 4 Alexei Ozerov ,4 Book chapter in press with "Plate Boundary Zones," edited by Seth Stein and Jeffrey Freymuller Abstract The Kamchatka peninsula in Russian East Asia lies at the junction of a transcurrent plate boundary, aligned with the western Aleutian Islands, and a steeply-dipping subduction zone with near-normal convergence. Seismicity patterns and P-wave tomography argue that subducting Pacific lithosphere terminates at the Aleutian junction, and that the downdip extension (>150km depth) of the slab edge is missing. Seismic observables of elastic anisotropy (SKS splitting and Love-Rayleigh scattering) are consistent \Vith asthenospheric strain that rotates from trench-parallel beneath the descending slab to trench-normal beyond its edge. Present-day arc volcanism is concentrated near the slab edge, in the Klyuchevskoy and Sheveluch eruptive centers. Loss of the downdip slab edge, whether from thermo-convective or ductile instability, and subsequent "slab-window" mantle return flow is indicated by widespread Quaternary volcanism in the Sredinny Range inland of Klyuchevskoy and Sheveluch, as well as the inferred Quaternary uplift of the central Kamchatka depression. The slab beneath Klyuchevskoy has shallower dip (35°) than the subduction zone farther south (55°) suggesting a transient lofting of the slab edge, either from asthenospheric flow or the loss of downdip load.
    [Show full text]
  • Overview of the Precursors and Dynamics of the 2012-13 Basaltic
    Journal of Volcanology and Geothermal Research 299 (2015) 19–34 Contents lists available at ScienceDirect Journal of Volcanology and Geothermal Research journal homepage: www.elsevier.com/locate/jvolgeores Overview of the precursors and dynamics of the 2012–13 basaltic fissure eruption of Tolbachik Volcano, Kamchatka, Russia Alexander Belousov a,⁎,MarinaBelousovaa,BenjaminEdwardsb, Anna Volynets a, Dmitry Melnikov a a Institute of Volcanology and Seismology, Petropavlovsk-Kamchatsky, Russia b Dickinson College, PA, USA article info abstract Article history: We present a broad overview of the 2012–13 flank fissure eruption of Plosky Tolbachik Volcano in the central Received 14 January 2015 Kamchatka Peninsula. The eruption lasted more than nine months and produced approximately 0.55 km3 DRE Accepted 22 April 2015 (volume recalculated to a density of 2.8 g/cm3) of basaltic trachyandesite magma. The 2012–13 eruption of Available online 1 May 2015 Tolbachik is one of the most voluminous historical eruptions of mafic magma at subduction related volcanoes glob- ally, and it is the second largest at Kamchatka. The eruption was preceded by five months of elevated seismicity and Keywords: fl Kamchatka ground in ation, both of which peaked a day before the eruption commenced on 27 November 2012. The batch of – – 2012–13 Tolbachik eruption high-Al magma ascended from depths of 5 10 km; its apical part contained 54 55 wt.% SiO2,andthemainbody – fi Basaltic volcanism 52 53 wt.% SiO2. The eruption started by the opening of a 6 km-long radial ssure on the southwestern slope of Eruption dynamics the volcano that fed multi-vent phreatomagmatic and magmatic explosive activity, as well as intensive effusion Eruption monitoring of lava with an initial discharge of N440 m3/s.
    [Show full text]
  • Weathering of Volcanic Ash in the Cryogenic Zone of Kamchatka, Eastern Russia
    Clay Minerals, (2014) 49, 195–212 OPEN ACCESS Weathering of volcanic ash in the cryogenic zone of Kamchatka, eastern Russia 1, 2 E. KUZNETSOVA * AND R. MOTENKO 1 SINTEF Building and Infrastructure, Trondheim, NO-7465, Norway, and 2 Lomonosov Moscow State University, Moscow, 119991, Russia (Received 8 August 2012; revised 28 August 2013; Editor: Harry Shaw) ABSTRACT: The nature of the alteration of basaltic, andesitic and rhyolitic glass of Holocene and Pleistocene age and their physical and chemical environments have been investigated in the ash layers within the cryogenic soils associated with the volcanoes in the central depression of Kamchatka. One of the main factors controlling the alteration of the volcanic glass is their initial chemistry with those of andesitic (SiO2 =53À65 wt.%) and basaltic (SiO2 < 53 wt.%) compositions being characterized by the presence of allophane, whereas volcanic glass of rhyolitic composition (SiO2>65 wt.%) are characterized by opal. Variations in the age of eruption of individual ashes, the amount and nature of the soil water, the depth of the active annual freeze-thawing layer, the thermal conductivity of the weathering soils, do not play a controlling role in the type of weathering products of the ashes but may affect their rates of alteration. KEYWORDS: volcanic ash, allophane, opal, unfrozen water, thermal conductivity, permafrost, Kamchatka. The highly active volcanic area of Kamchatka in local and remote eruptions and from the secondary eastern Russia is part of the circum-Pacific belt of re-deposition of ash (Bazanova et al., 2005). andesitic volcanism. It is situated north of the 49th Considerable research has been carried out on the parallel of latitude and is characterized by a weathering of volcanic glass.
    [Show full text]
  • Thermal Remote Sensing Reveals Communication Between
    www.nature.com/scientificreports OPEN Thermal remote sensing reveals communication between volcanoes of the Klyuchevskoy Volcanic Group Diego Coppola1,2*, Marco Laiolo1,2, Francesco Massimetti1,3, Sebastian Hainzl3, Alina V. Shevchenko3,4, René Mania3, Nikolai M. Shapiro5,6 & Thomas R. Walter3 Volcanoes are traditionally considered isolated with an activity that is mostly independent of the surrounding, with few eruptions only (< 2%) associated with a tectonic earthquake trigger. Evidence is now increasing that volcanoes forming clusters of eruptive centers may simultaneously erupt, show unrest, or even shut-down activity. Using infrared satellite data, we detail 20 years of eruptive activity (2000–2020) at Klyuchevskoy, Bezymianny, and Tolbachik, the three active volcanoes of the Klyuchevskoy Volcanic Group (KVG), Kamchatka. We show that the neighboring volcanoes exhibit multiple and reciprocal interactions on diferent timescales that unravel the magmatic system’s complexity below the KVG. Klyuchevskoy and Bezymianny volcanoes show correlated activity with time-predictable and quasiperiodic behaviors, respectively. This is consistent with magma accumulation and discharge dynamics at both volcanoes, typical of steady-state volcanism. However, Tolbachik volcano can interrupt this steady-state regime and modify the magma output rate of its neighbors for several years. We suggest that below the KVG the transfer of magma at crustal level is modulated by the presence of three distinct but hydraulically connected plumbing systems. Similar complex interactions may occur at other volcanic groups and must be considered to evaluate the hazard of grouped volcanoes. Closely located or clustered volcanoes may become conjointly active and are hence considered especially haz- ardous, yet robust evidence for their connectivity remains sparse.
    [Show full text]
  • Atrakcje Geoturystyczne Grupy Wulkanów Kluczewskiej Sopki
    Geoturystyka 1 (20) 2010: 51-63 Atrakcje geoturystyczne grupy wulkanów Kluczewskiej Sopki, Północna Kamczatka, Rosja Geotouristic attractions of the Klyuchevskoy group volcanoes, North Kamchatka, Russia Marek Łodziński AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, Department of General Geology, Environmental Protection and Geotourist Al. Mickiewicza 30, 30-059 Kraków, Poland e-mail: [email protected] Wstęp Morze Czukockie Kamczatka jest półwyspem o niedocenionych i niewyko- rzystanych walorach geoturystycznych. Potencjał geotury- Stany Rosja Zjednoczone styczny tego obszaru jest ogromny ze względu na to, że Kamczatka wchodzi w skład tzw. „okołopacyficznego pier- Alaska Kanada ścienia ognia”, czyli pierścienia wokół Pacyfiku z dużą ilością czynnych wulkanów (na Kamczatce jest 160 wulkanów), co Morze a ściśle związane jest z jej geotektonicznym położeniem na k Beringa t a granicy płyt litosferycznych: pacyficznej i mikropłyty ochoc- z c n y m j kiej (Turner et al., 1998, Konstantinovskaia, 2000, Gaedicke a k o K p o O c e a n S et al., 2000, Golonka et al., 2003, Kozhurin, 2004, Kozhurin et al., 2006, Portnyagin et al., 2007) (Fig. 1-3). Powszechnie zwana też jest „krainą ognia i lodu” i stąd wynika jej niezwy- Treść: Artykuł przedstawia walory geoturystyczne grupy wulkanów kłość, jako obiektu geoturystycznego, gdyż odsłania wyjąt- Kluczewskiej Sopki na Północnej Kamczatce. Pokazane zostało kowo dobrze zachowane, różnorodne formy i zjawiska wul- położenie półwyspu Kamczackiego
    [Show full text]
  • The Geography of Kamchatka
    Global and Planetary Change 134 (2015) 3–9 Contents lists available at ScienceDirect Global and Planetary Change journal homepage: www.elsevier.com/locate/gloplacha The geography of Kamchatka Vivienne Jones a,⁎, Olga Solomina b a ECRC, Department of Geography, University College London, Pearson Building, London WC1E 6BT, UK b Russian Academy of Sciences, Institute of Geography RAS, Staromonetny-29, Moscow 119017, Russia article info abstract Article history: This paper briefly reviews the physical and human geography of the Kamchatka region and summarises previous Received 9 February 2015 research on Holocene climate dynamics. We provide context for the rest of the Special Issue of the Journal Global Received in revised form 2 June 2015 and Planetary Change entitled ‘Holocene climate change in Kamchatka’, the primary focus of which is the use of Accepted 4 June 2015 lake sediment records for palaeoclimatic inferences. In this paper an additional perspective from ongoing tree Available online 6 June 2015 ring, ice core and borehole temperature reconstructions illustrates that the Kamchatka region is rich in paleocli- fi Keywords: matic proxies. The period of the last 200 years is suf ciently covered by the proxy information, including recon- fl Volcanism structions with annual resolution. In this period the tree-rings, ice cores, boreholes, and glacier uctuations Flora recorded a 1 °C warming and a general glacier retreat, i.e. the transition from the Little Ice Age climate to the mod- Fauna ern one. Although the proxies have different resolution, accuracy and seasonality in general they demonstrate a Climate coherent picture of environmental changes in the last two centuries.
    [Show full text]
  • Geography of Volcanic Zones and Distribution of Active Volcanoes - V
    NATURAL AND HUMAN INDUCED HAZARDS – Vol. I - Geography of Volcanic Zones and Distribution of Active Volcanoes - V. Yu. Kirianov GEOGRAPHY OF VOLCANIC ZONES AND DISTRIBUTION OF ACTIVE VOLCANOES V. Yu. Kirianov Institute of Volcanic Geology and Geochemistry RAS, Petropavlovsk-Kamchatsky, Russia Keywords: volcanoes, Pacific, island arc, eruption, crust Contents 1. Introduction 2. Volcanoes of the Pacific Ocean Island Arcs and Alaska Continental Rim 2.1. Frontal Island Arcs of the Pacific Ocean 2.2. Inner Island Arcs of the Pacific Ocean 2.3. Reverse Island Arcs of Pacific Ocean 3. Volcanoes of the East Pacific Continental Rim 3.1. Cascade Volcanoes 3.2. Mexican Volcanic Belt 3.3. Guatemala–Nicaragua zone 3.4. Columbia–Ecuador zone 3.5. Peru–Bolivian Zone 3.6. Argentina–Chilean zone 4. Volcanoes of Alpine-Indonesian Mountain belt 4.1. Alpine-Himalayan System 4.2. Burma–Indonesian System 5. Volcanoes of East African–Arabian Belt 5.1. Arabian–Nubian High 5.2. East Africa High 6. Volcanoes of Rifts and Mountains of Eurasia 6.1. Manchuria 6.2. Far Northeast Asia 7. Volcanoes of the West Indies Island Arc 8. Volcanoes of the Ocean Floor 8.1. Iceland UNESCO – EOLSS 8.2. Mid-Atlantic Islands 8.3. Hawaii 8.4. Indian Ocean 8.5. Submarine SAMPLEVolcanoes CHAPTERS 9. Conclusions Acknowledgments Glossary Bibliography Biographical Sketch Summary Volcanic eruptions are the most awesome and powerful display of nature’s force. Every ©Encyclopedia of Life Support Systems (EOLSS) NATURAL AND HUMAN INDUCED HAZARDS – Vol. I - Geography of Volcanic Zones and Distribution of Active Volcanoes - V. Yu. Kirianov year about 50 volcanoes throughout the world are active above sea level.
    [Show full text]
  • A Joint Study of Seismicity and SAR Interferometry Observations for Assessing the Possibility of an Eruption of the Dormant Bolshaya Udina Volcano S
    A Joint Study of Seismicity and SAR Interferometry Observations for Assessing the Possibility of an Eruption of the Dormant Bolshaya Udina Volcano S. Senyukov, V. Mikhailov, I. Nuzhdina, E. Kiseleva, S. Ya. Droznina, V. Timofeeva, M. Volkova, Nikolai Shapiro, T. Yu. Kozhevnikova, Z. Nazarova, et al. To cite this version: S. Senyukov, V. Mikhailov, I. Nuzhdina, E. Kiseleva, S. Ya. Droznina, et al.. A Joint Study of Seismic- ity and SAR Interferometry Observations for Assessing the Possibility of an Eruption of the Dormant Bolshaya Udina Volcano. Journal of Volcanology and Seismology, MAIK Nauka/Interperiodica, 2020, 14 (5), pp.305 - 317. 10.1134/s074204632005005x. hal-03088541 HAL Id: hal-03088541 https://hal.archives-ouvertes.fr/hal-03088541 Submitted on 19 Jul 2021 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. ISSN 0742-0463, Journal of Volcanology and Seismology, 2020, Vol. 14, No. 5, pp. 305–317. © Pleiades Publishing, Ltd., 2020. Russian Text © The Author(s), 2020, published in Vulkanologiya i Seismologiya, 2020, No. 5, pp. 26–39. A Joint Study of Seismicity and SAR Interferometry Observations for Assessing the Possibility of an Eruption of the Dormant Bolshaya Udina Volcano S.
    [Show full text]
  • Three Different Types of Plumbing System Beneath the Neighboring
    PUBLICATIONS Journal of Geophysical Research: Solid Earth RESEARCH ARTICLE Three different types of plumbing system beneath 10.1002/2017JB014082 the neighboring active volcanoes of Tolbachik, Key Points: Bezymianny, and Klyuchevskoy in Kamchatka • A new crustal seismic model is constructed for Tolbachik and Ivan Koulakov1,2 , Ilyas Abkadyrov3, Nassir Al Arifi4, Evgeny Deev1,2 , Svetlana Droznina5, adjacent volcanoes 3 1 4,6 7 5 • Seismicity beneath Klyuchevskoy Evgeny I. Gordeev , Andrey Jakovlev , Sami El Khrepy , Roman I. Kulakov , Yulia Kugaenko , 1 5 3,8 1 reflects a straight conduit that brings Anzhelika Novgorodova , Sergey Senyukov , Nikolay Shapiro , Tatyana Stupina , and magma directly from the mantle Michael West9 • The Bezymianny volcano is fed through separating felsic magma and 1Department of Geophysics, Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia, volatiles from midcrustal sources 2Department of Geology and Geophysics, Novosibirsk State University, Novosibirsk, Russia, 3Institute of Volcanology and Seismology FEB RAS, Petropavlovsk-Kamchatsky, Russia, 4King Saud University, Riyadh, Saudi Arabia, 5Kamchatkan Branch of Geophysical Survey RAS Piip Boulevard, Petropavlovsk-Kamchatsky, Russia, 6Department of Geophysics, National Correspondence to: Research Institute of Astronomy and Geophysics, Helwan, Egypt, 7Geology Department, Moscow State University, Moscow, I. Koulakov, Russia, 8Institut de Physique du Globe de Paris, Sorbonne Paris Cité, CNRS (UMR 7154), Paris, France, 9Geophysical Institute, [email protected] University of Alaska Fairbanks, Fairbanks, Alaska, USA Citation: Koulakov, I., et al. (2017), Three different Abstract The Klyuchevskoy group of volcanoes (KGV) in Kamchatka includes three presently active types of plumbing system beneath the volcanoes (Klyuchevskoy, Bezymianny, and Tolbachik) located close together in an area of approximately neighboring active volcanoes of 50 × 80 km.
    [Show full text]
  • Churikova T.G. Et Al. (2015) the Tolbachik Volcanic Massif: a Review
    Journal of Volcanology and Geothermal Research 307 (2015) 3–21 Contents lists available at ScienceDirect Journal of Volcanology and Geothermal Research journal homepage: www.elsevier.com/locate/jvolgeores The Tolbachik volcanic massif: A review of the petrology, volcanology and eruption history prior to the 2012–2013 eruption T.G. Churikova a,⁎, B.N. Gordeychik b,B.R.Edwardsc,V.V.Ponomarevaa,E.A.Zelenind a Institute of Volcanology and Seismology, Far East Branch Russian Academy of Sciences, 9 Piip Boulevard, Petropavlovsk-Kamchatsky 683006, Russia b Institute of Experimental Mineralogy, Russian Academy of Sciences, Academica Osypyana ul., 4, Chernogolovka, Moscow region 142432, Russia c Department of Earth Sciences, Dickinson College, Carlisle, PA 17013, USA d Geological Institute, Russian Academy of Sciences, Pyzhevsky lane 7, Moscow 119017, Russia article info abstract Article history: The primary goal of this paper is to summarize all of the published data on the Tolbachik volcanic massif in order Received 14 February 2015 to provide a clear framework for the geochronologic, petrologic, geochemical and to a lesser extent the geophys- Accepted 10 October 2015 ical and tectonic characteristics of the Tolbachik system established prior to the 2012–2013 eruption. The Available online 23 October 2015 Tolbachik massif forms the southwestern part of the voluminous Klyuchevskoy volcanic group in Kamchatka. The massif includes two large stratovolcanoes, Ostry (“Sharp”) Tolbachik and Plosky (“Flat”) Tolbachik, and a Keywords: 70 km long zone of the basaltic monogenetic cones that form an arcuate rift-like structure running across the Tolbachik volcanic massif – Klyuchevskaya group Plosky Tolbachik summit. The Tolbachik massif gained international attention after the 1975 1976 Great Subduction Tolbachik Fissure Eruption (GTFE), which was one of the largest eruptions of the 20th century and one of the Eruption history six largest basaltic fissure eruptions in historical time.
    [Show full text]
  • Mantle Feeding Sources of the Northern Group of Volcanoes in Kamchatka Inferred from the Tomographic Inversion of Travel Time Data of the KISS Network
    EGU2020-4015 https://doi.org/10.5194/egusphere-egu2020-4015 EGU General Assembly 2020 © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License. Mantle feeding sources of the Northern group of volcanoes in Kamchatka inferred from the tomographic inversion of travel time data of the KISS network Ivan Koulakov1,2, Nikolay Shapiro3,4, Evgeny I. Gordeev4, Christoph Sens-Schoenfelder5, Ilyas Abkadyrov4, Sergey Senyukov6, Birger Luehr5, Natalia Bushenkova1, Andrey Jakovlev1,2, Tatiana Stupina1, and Angelika Novgorodova1 1Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Geophysics, Novosibirsk, Russian Federation ([email protected]) 2Novosibirsk State University, Russia 3Institut de Physique du Globe de Paris, France 4Institute of Volcanology and Seismology, FEB RAS, Petropavlovsk-Kamchatsky, Russia 5GeoForschungsZentrum, Potsdam, Germany 6Kamchatkam Branch of Geophysical Survey, RAS, Petropavlovsk-Kamchatsky, Russia The major part of the Northern group of volcanoes (NGV) in Kamchatka is occupied by the Klyuchevskoy group, which is a unique cluster of more than thirteen volcanos having exceptionally diverse eruption styles and compositions. The NGV also includes Shiveluch volcano to the north and Kizimen volcano to the south, both andesitic strongly explosive volcanoes. The crustal structure beneath the Klyuchevskoy group was previously explored using data of the permanent stations and several temporary networks; however, for studying the mantle structures, no high- quality data was available. To close this gap, a temporary seismic KISS network was installed throughout the NGV by an international consortium from August 2015 to July 2016. Together with 22 permanent stations, it included more than 100 simultaneously operating seismic stations. Based on the KISS data, we manually picked more than 43,000 arrival times of the P and S waves from 665 events (65 picks per event on average).
    [Show full text]
  • "Xenolith Formation & Development of Basaltic Volcanic Conduits During
    a b Xenolith Formation and the Development of Basaltic Volcanic Conduits During the 1975 Tolbachik Eruptions, Kamchatka, with Implications for Volcanic Hazards Assessments at Yucca Mountain, Nevada Philip Doubika, Brittain E. Hillbl aDepartmentof Geology, State University of New York Buffalo, NY 14260 U.S.A. bCenterforNuclear Waste Regulatory Analyses, Southwest Research Institute, 6220 CulebraRd., San Antonio, TX 78238-5166 U.S.A. ABSTRACT Xenoliths in pyroclastic fall deposits from the 1975 Tolbachik eruption provide detailed information about the timing and development of subsurface conduits associated with basaltic cinder cone eruptions. The two largest vents from the 1975 Tolbachik eruption contain xenoliths derived from magmatic and hydromagmatic processes, which can be correlated with observed styles of eruption activity. Although many basaltic eruptions progress from early hydromagmatic activity to late magmatic activity, transient hydromagmatic events occurred relatively late in the 1975 Tolbachik eruption sequence. Magmatic fall deposits contain 0.01-0.3 volume percent xenoliths derived from <3-km-deep rocks, which can be derived from cylindrical conduits 6-15 m wide and 1.7-2.8 km deep. Eruption periods that supported the highest tephra columns (i.e., droplet flow regime) produced few of these xenoliths. Most of these xenoliths were derived from periods with relatively lower tephra columns and active lava flows (i.e., annular 2-phase flow). Several periods of decreased eruptive activity resulted in inflow of deep (>500 m) groundwater into the dry-out zone around the conduit, disrupting and ejecting 3 I15-_106 M of wall-rock through hydromagmatic processes. Cylindrical conduits widened to 8-48 m to accommodate these volumes.
    [Show full text]