Paleorift structure in the eastern environs of the Siberian Platform

Levashov, K. K.

doi:10.1080/00206818209467045

Cited by 2 publications

(1 citation statement)

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“…Rifting was accompanied by an extensive swarm of basaltic dikes that are observed along the entire fold and thrust belt and was followed by rapid subsidence, which led to the deposition of the immense Carboniferous to Jurassic Verkhoyansk sedimentary complex along the new continental margin (Parfenov et al, 1995). In the northern and central parts of Sette-Daban tectonic zone of the South Verkhoyansk sector, there are Devonian-Early Carboniferous volcanogenicsedimentary strata up to 1800 m thick interbedded with tholeiitic basalts and trachybasalts which are thought to be genetically related to the continental rifting process (Levashov, 1974(Levashov, , 1977Bulgakova and Kolodeznikov, 1990).It is likely that the Okhotsk terrane was separated from North Asia at this time and moved a relatively small distance away (Fig. 11).…”

Section: Origin Of the Okhotsk Terranementioning

confidence: 99%

Middle Paleozoic-Mesozoic boundary of the North Asian craton and the Okhotsk terrane: new geochemical and geochronological data and their geodynamic interpretation

Prokopiev

Toro

Hourigan

et al. 2009

Stephan Mueller Spec. Publ. Ser.

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Abstract. The Okhotsk terrane, located east of the South Verkhoyansk sector of the Verkhoyansk fold-and-thrust belt, has Archean crystalline basement and Riphean to Early Paleozoic sedimentary cover similar to that of the adjacent the North Asian craton. However, 2.6 Ga biotite orthogneisses of the Upper Maya uplift of the Okhotsk terrane yielded Early Devonian 40 Ar/ 39 Ar cooling ages, evidence of a MidPaleozoic metamorphic event not previously known. These gneisses are also intruded by 375±2 Ma (Late Devonian) calc-alkaline granodiorite plutons that we interpret as part of a continental margin volcanic arc. Therefore, Late Devonian rifting, which affected the entire eastern margin of North Asia separating the Okhotsk terrane from the North Asian craton, was probably a back-arc event.Our limited 40 Ar/ 39 Ar data from the South Verkhoyansk metamorphic belt suggests that low grade metamorphism and deformation started in the Late Jurassic due to accretion of the Okhotsk terrane to the North Asia margin along the Bilyakchan fault. Shortening and ductile strain continued in the core of the South Verkhoyansk metamorphic belt until about 120 Ma due to paleo-Pacific subduction along the UdaMurgal continental margin arc.

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Section: Origin Of the Okhotsk Terranementioning

confidence: 99%