Geodynamics of the northwestern sector of the pacific mobile belt in the Late Cretaceous-Early Paleogene

Chekhovich, V. D.; Sukhov, A. N.; Kononov, M. V.; Palandzhyan, S. A.

doi:10.1134/s0016852109040049

Cited by 21 publications

(4 citation statements)

References 32 publications

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“…In the scientific literature several versions of the origin of this base are put forward. A number of researchers believe that this is a separate West Kamchatka microcontinental block [32][33][34]. Others suggest that the West Kamchatka zone is part of the Sea of Okhotsk megablock [25, 26,35], which is supported by the authors of this article.…”

supporting

confidence: 61%

“…1, a). Their formation is associated with the successive attachment of the Olyutorskaya and Kronotskaya island arcs, the displacement of the subduction zone towards the Pacific Ocean, and the formation of volcanic belts and forearc troughs, which are confidently mapped on various tectonic schemes [34,36]. These structures are contrasted in the potential fields (Fig.…”

mentioning

confidence: 97%

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Deep structure, tectonics and geodynamics of the Sea of Okhotsk region and structures of its folded frame

Egorov

Bolshakova

Kalinin

et al. 2022

PMI

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The use of the zonal-block model of the earth's crust for the construction of regional tectonic schemes and sections of the earth's crust based on a complex of geological and geophysical data makes it possible to consider the resulting maps and sections as tectonic models. The main elements of such models are blocks with an ancient continental base and interblock zones formed by complexes of island arcs, an accretionary prism, or oceanic crust. The developed geotectonic model of the Sea of Okhotsk region reflects the features of the deep structure, tectonics, and geodynamics. The Cimmerian Novosibirsk-Chukotka, Verkhoyansk-Kolyma, Kolyma-Omolon, and Amur folded regions and the Alpides of the Koryak-Kamchatka and Sakhalin-Sikhote-Alin folded regions are developed along the northern, western, and southern boundaries of the Sea of Okhotsk megablock with a continental crust type. From the east, the megablock is limited by oceanic basins and island arcs.

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supporting

confidence: 61%

mentioning

confidence: 97%

Deep structure, tectonics and geodynamics of the Sea of Okhotsk region and structures of its folded frame

Egorov

Bolshakova

Kalinin

et al. 2022

PMI

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“…These are exposed in a north‐south‐oriented 200‐km‐long and 30‐ to 40km‐wide zone in the southern part of the Sredinny Range (Figure ). The Sredinny Complex is either part of the Okhotsk block (e.g., Bindeman et al, ; Konstantinovskaya, ; Parfenov & Natal'in, ), or a separate West Kamchatka microcontinental block (Bogdanov & Chekhovich, ; Chekhovich et al, ; Filatova, ; Zonenshain, ), or represents the metamorphosed equivalent of the terrigenous sediments of the Asian continental margin (e.g., Hourigan et al, ; Kirmasov et al, ; Shapiro & Solov’ev, ). The structurally lowest and highest‐grade unit, the Kolpakova Group, consists of Lower to Upper Cretaceous granulite‐ and amphibolite‐facies gneisses and migmatites (Hourigan et al, ; Tararin, ; Vinogradov et al, ; Figure ).…”

Section: Reviewmentioning

confidence: 99%

Reconstruction of Subduction and Back‐Arc Spreading in the NW Pacific and Aleutian Basin: Clues to Causes of Cretaceous and Eocene Plate Reorganizations

2019

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The Eocene (~50–45 Ma) major absolute plate motion change of the Pacific plate forming the Hawaii‐Emperor bend is thought to result from inception of Pacific plate subduction along one of its modern western trenches. Subduction is suggested to have started either spontaneously, or result from subduction of the Izanagi‐Pacific mid‐ocean ridge, or from subduction polarity reversal after collision of the Olyutorsky arc that was built on the Pacific plate with NE Asia. Here we provide a detailed plate‐kinematic reconstruction of back‐arc basins and accreted terranes in the northwest Pacific region, from Japan to the Bering Sea, since the Late Cretaceous. We present a new tectonic reconstruction of the intraoceanic Olyutorsky and Kronotsky arcs, which formed above two adjacent, oppositely dipping subduction zones at ~85 Ma within the north Pacific region, during another Pacific‐wide plate reorganization. We use our reconstruction to explain the formation of the submarine Shirshov and Bowers Ridges and show that if marine magnetic anomalies reported from the Aleutian Basin represent magnetic polarity reversals, its crust most likely formed in an ~85‐ to 60‐Ma back‐arc basin behind the Olyutorsky arc. The Olyutorsky arc was then separated from the Pacific plate by a spreading ridge, so that the ~55‐ to 50‐Ma subduction polarity reversal that followed upon Olyutorsky‐NE Asia collision initiated subduction of a plate that was not the Pacific. Hence, this polarity reversal may not be a straightforward driver of the Eocene Pacific plate motion change, whose causes remain enigmatic.

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“…As more geological and geo physical data became available, numerous geological structural maps were published, as well as geological and geological-geophysical sections that characterize the hypothetical deep structure of the region. According to some geodynamic concepts (Chekhovich et al, 2009), northern Kamchatka and its Koryak Upland were viewed as an accretionary collision system during Late Creta ceous and Cenozoic time. This system expressed the accretion of various major lithosphere ensembles (ter MOROZ et al ranes) to the edge of the Asian continent.…”

Section: A Brief Geological and Geophysical Description Of The Areamentioning

confidence: 99%

The deep structure of the Olyutorskii earthquake rupture zone in the Koryak Upland: Geophysical evidence

Moroz

Мороз

Логинов

2015

J. Volcanolog. Seismol.

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This paper considers the data of magnetotelluric sounding (MTS) and gravity and magnetic sur veys, as well as other geological information. We describe the methods that were used in making the observa tions and for interpretation of MTS data. We focus on incorporating the influence of the shift effect and the coast effect. Generalized geoelectric sections are based on mean longitudinal curves, which are less subject to distortion. Transverse curves were used for fault identification. The geoelectric sections include a sedimen tary volcanogenic layer, a high ohmic crust, and a conductive lithosphere layer. They contain faults that were detected from the divergences between oriented MTS curves and other data. The deep seated faults in the Vyvenka basin have surface expression in the form of seismotectonic discontinuities that extend for 80 and 140 km. It was found that the hypocenters of the Olyutorskii earthquake and its aftershocks were in the crustal layer above the conductive lithosphere layer. Most aftershock hypocenters are typically situated in the area of the deep fault. We discuss a possible origin of the conductive lithosphere layer and of deep faults.

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Geodynamics of the northwestern sector of the pacific mobile belt in the Late Cretaceous-Early Paleogene

Cited by 21 publications

References 32 publications

Deep structure, tectonics and geodynamics of the Sea of Okhotsk region and structures of its folded frame

Deep structure, tectonics and geodynamics of the Sea of Okhotsk region and structures of its folded frame

Reconstruction of Subduction and Back‐Arc Spreading in the NW Pacific and Aleutian Basin: Clues to Causes of Cretaceous and Eocene Plate Reorganizations

The deep structure of the Olyutorskii earthquake rupture zone in the Koryak Upland: Geophysical evidence

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