Does Kamchatka belong to North America? An extruding Okhotsk block suggested by coastal neotectonics of the Ozernoi Peninsula, Kamchatka, Russia

Pedoja, Kévin; Bourgeois, Joanne; Pinegina, Tatiana K.; Higman, Bretwood

doi:10.1130/g22062.1

Cited by 28 publications

(32 citation statements)

References 20 publications

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“…From consistency of beach ridge elevations on tectonically quiet Kamchatka coastlines (Martin et 1985 1986 1972 1983 1975-1978 1971-1972 80 40 0 -20 1983-1985 1971-1986 1 Perevalnaya R. Bourgeois et al, 2006;Pinegina et al, 2012), we interpret that since 5000-6000 yr ago, regional sea level has been stable within about ±1 m. For this reason, we interpret relative sealevel fl uctuations along Kamchatsky Peninsula during the last ~5000 yr to have been caused primarily by coastal vertical tectonic deformation. This tectonic interpretation is supported by the signifi cant (up to a few tens of meters) differences in elevation of Holocene marine terraces of the same age (based on tephra chronology) along the eastern coast of Kamchatka (this paper; Pedoja et al, 2006;Martin et al, 2004).…”

Section: Sea-level Curvementioning

confidence: 52%

“…For this zone, we have limited data from Holocene terraces, but well-preserved Pleistocene terraces (Pedoja et al, 2006(Pedoja et al, , 2011 improve our conclusion about the general direction of vertical movement.…”

Section: Results: Holocene Vertical Deformation On the Kamchatsky Penmentioning

confidence: 99%

“…Uplift and exhumation rates on Kamchatsky Peninsula have been previously determined by mapping of Pleistocene terraces and by analysis of uplifted strata (Fedorenko, 1965;Erlikh et al, 1974;Freitag et al, 2001;Pedoja et al, 2006Pedoja et al, , 2011Pedoja et al, , 2013Pfl anz et al, 2013). According to Pleistocene terrace data, rates of coastal vertical movements on Kamchatsky Peninsula, averaged over a period of 120 k.y., range from 0.08 to 1.33 mm/yr (Pedoja et al, 2006).…”

Section: Vertical Displacementmentioning

confidence: 99%

“…2;Pedoja et al, 2006Pedoja et al, , 2011. The shape of coastal crosssectional profi les through these marine terraces depends on the rate and nature (gradual or discrete) of relative sea-level change.…”

Section: Holocene Marine Terracesmentioning

confidence: 99%

“…According to Pleistocene terrace data, rates of coastal vertical movements on Kamchatsky Peninsula, averaged over a period of 120 k.y., range from 0.08 to 1.33 mm/yr (Pedoja et al, 2006). Based on apatite cooling ages, Freitag et al (2001) …”

Section: Vertical Displacementmentioning

confidence: 99%

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A nexus of plate interaction: Vertical deformation of Holocene wave-built terraces on the Kamchatsky Peninsula (Kamchatka, Russia)

Pinegina¹,

Bourgeois²,

Kravchunovskaya³

et al. 2013

Geological Society of America Bulletin

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International audienceKamchatsky Peninsula lies within a complex meeting place of tectonic plates, in particular, the orthogonal interaction of the west-moving Komandorsky Island block with mainland Kamchatka. Examining the Holocene history of vertical deformation of marine wave-built terraces along the peninsular coast, we differentiated tectonic blocks undergoing uplift and tilting separated by zones of stable or subsided shorelines. We analyzed ∼200 excavations along >30 coastal profiles and quantified vertical deformation on single profiles as well as along the coast using paleoshorelines dated with marker tephras. For the past ∼2000 yr, the average rates of vertical deformation range from about -1 to +7 mm/yr. Uplift patterns are similar to those detected from historical leveling and from mapping of the stage 5e Quaternary marine terrace (ca. 120 ka). Average vertical deformation in the Holocene is highest for the shortest studied time period, from ca. A.D. 250 to 600, and it is several times faster than rates for marine oxygen isotope stage (MIS) 5e terraces. Vertical displacements observed along the coast are most likely coseismic and probably have included subsidence as well as uplift events. Because subsidence is generally associated with erosion, almost surely more prehistoric large earthquakes occurred than are recorded as topographic steps in these terraces. We suggest that the distribution of coastal uplift and subsidence observed along the Kamchatsky Peninsula coastline is qualitatively explained by the squeezing of the Kamchatsky Peninsula block between the Bering and Okhotsk plates, and the Komandorsky Island block

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Section: Sea-level Curvementioning

confidence: 52%

Section: Results: Holocene Vertical Deformation On the Kamchatsky Penmentioning

confidence: 99%

Section: Vertical Displacementmentioning

confidence: 99%

Section: Holocene Marine Terracesmentioning

confidence: 99%

Section: Vertical Displacementmentioning

confidence: 99%

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A nexus of plate interaction: Vertical deformation of Holocene wave-built terraces on the Kamchatsky Peninsula (Kamchatka, Russia)

Pinegina¹,

Bourgeois²,

Kravchunovskaya³

et al. 2013

Geological Society of America Bulletin

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Plate coupling and strain in the far western Aleutian arc modeled from GPS data

Коган

Frolov

Vasilenko

et al. 2017

Geophysical Research Letters

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The Aleutian and Kuril‐Kamchatka arcs meet at a triple junction of the Pacific (PAC), Bering (BER), and North American (NAM) plates. We invert GPS observations from the westernmost Aleutian (Komandorsky) Islands and Kamchatka for the fault locking depth and block motion in the far western Aleutian transform boundary. Three boundary models were considered: (1) only the Aleutian thrust fault without a trench‐normal component, (2) only a strike‐slip fault in the back arc north of the Komandorsky Islands, and (3) a rigid Komandorsky sliver bounded by the Aleutian and back‐arc faults. Observed velocities prefer Model 3, with a secular westward sliver velocity of 51 mm/a relative to NAM (two thirds of the total PAC‐NAM motion). The observed velocities are ~10% slower because of elastic strain from boundary faults. The best fitting locking depth of faults bounding the sliver is 12 km, which is similar to depths observed in diverse tectonic environments.

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Glaciers and climate in Pacific Far NE Russia during the Last Glacial Maximum

Barr

Clark

2011

J Quaternary Science

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A combined geomorphological-physical model approach is used to generate three-dimensional reconstructions of glaciers in Pacific Far NE Russia during the global Last glacial Maximum (gLGM). The horizontal dimensions of these ice masses are delineated by moraines, their surface elevations are estimated using an iterative flowline model and temporal constraints upon their margins are derived from published age estimates. The equilibrium line altitudes (ELAs) of these ice masses are estimated, and gLGM climate is reconstructed using a simple degree-day melt model. The results indicate that, during the gLGM, ice masses occupying the Pekulney, Kankaren and Sredinny mountains of Pacific Far NE Russia were of valley glacier and ice field type. These glaciers were between 7 and 80 km in length, and were considerably less extensive than during pre-LGM phases of advance. gLGM ice masses in these regions had ELAs of between 575 AE 22 m and 1035 AE 41 m (above sea level) -corresponding to an ELA depression of 350-740 m, relative to present. Data indicate that, in the Pekulney Mountains, this ELA depression occurred because of a 6.48C reduction in mean July temperature, and 200 mm a À1 reduction in precipitation, relative to present. Thus reconstructions support a restricted view of gLGM glaciation in Pacific Far NE Russia and indicate that the region's aridity precluded the development of large continental ice sheets.

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Does Kamchatka belong to North America? An extruding Okhotsk block suggested by coastal neotectonics of the Ozernoi Peninsula, Kamchatka, Russia

Cited by 28 publications

References 20 publications

A nexus of plate interaction: Vertical deformation of Holocene wave-built terraces on the Kamchatsky Peninsula (Kamchatka, Russia)

A nexus of plate interaction: Vertical deformation of Holocene wave-built terraces on the Kamchatsky Peninsula (Kamchatka, Russia)

Plate coupling and strain in the far western Aleutian arc modeled from GPS data

Glaciers and climate in Pacific Far NE Russia during the Last Glacial Maximum

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