The andesite extrusion of Mount Mishennaya, Kamchatka, and its age

Sheimovich, V. S.; Golovin, D. I.; Gertsev, D. O.

doi:10.1134/s0742046307040033

Cited by 2 publications

(3 citation statements)

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“…Figure 5 Temporal variations of monogenetic volcanoes and stratovolcanoes in MPZ are based on data from Aprelkov, Borzynova, 1963;Dirksen, 2009;Geological map..., 2000;Global…, 2021;Krasheninnikov et al, 2020;Masurenkov et al, 1991;Sheimovich et al, 2007, Holocene..., 2020. Symbols show absolute dating of eruptions.…”

Section: Discussionmentioning

confidence: 99%

“…2b, 3d). It is the extrusive dome with a diameter in the basement ~ 1 x 2 km (Sheimovich et al, 2007). It is a landmark hill with 385 m in altitude in downtown Petropavlovsk-Kamchatsky city with a viewpoint and TV station, while its slopes are covered with residential and government buildings (Fig.…”

Section: Geodynamic and Geological Settingsmentioning

confidence: 99%

“…The exposed thickness of andesitic rocks is 50-70 m on the northern slope of the cone, the flanks are covered with sedimentary rock of Late Cretaceouc Nikolskaya suite (Sheimovich et al, 2007), with xenoliths of sedimentary rocks present in the base of the intrusion (Grib, 1985). Age of the Mishennaya Mountain according to fission-track analyses is 700±200 ka (Geological map., 2000) and 600±200 ka was obtained by K-Ar dating of hornblendes (Sheimovich et al, 2007). All other extrusive domes north of MPZ are re-covered by debris avalanche of Avachinsky volcano, which occurred~ 30 ka BP (Ponomareva et al 2006).…”

Section: Geodynamic and Geological Settingsmentioning

confidence: 99%

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Pleistocene-Holocene Monogenetic Volcanism at Malko-Petropavlovsk Zone of Transverse Dislocations on Kamchatka: Geological Setting, Spatial, Geochemical Paticular Features and Potential Volcanic Hazards

Bergal‐Kuvikas

Bindeman²,

Чугаев

et al. 2021

Preprint

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Based on government statistical data ~80% of the local Kamchatkan population (~250 ka people) live in the major cities on the coastal line of Avacha Gulf . It is the main transport seaway to Kamchatka , and and important Asia - North America air transport corridor. The Avacha Gulf is located in the Malko-Petropavlovsk zone of transverse dislocations (MPZ) on the extension of deep transform fault on the boundary between various ly aged slabs. Most of monogenetic cinder cones chaotic distributed in relation to the trench and belong to the long-living rupture zones of MPZ. Some of the monogenetic volcanoes are parasitic cones on the slopes of Koryaksky and Avachinsky stratovolcanoes and related with their magma plumbing systems. We here present new results of the geochemical and isotopic stud ies of monogenetic volcanism in MPZ. Based on whole rock and trace element geochemistry, Sr-Nd-Pb isotopic ratios of monogenetic volcanism, magmas were shown to sample the enriched mantle source with dominance decompression melting without significant inputs of the slab`s components. Calculations of the P, T conditions suggest magma residence of monogenetic cinder cones on the Moho boundary. That correlates with the geophysical observation of crustal discontinuity under the MPZ. Monogenetic cinder cones have an active magma plumbing system because during the Holocene time were several periods of activations. Presented results show necessary install continuous monitoring of environment changing around the Avacha Gulf and more serious attention from government and science. A more detailed investigation of MPZ will help degrease potential risks of eruptions from monogenetic volcanoes for human and infrastructures.

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Section: Discussionmentioning

confidence: 99%

Section: Geodynamic and Geological Settingsmentioning

confidence: 99%