New data on the structure of the Sea of Okhotsk bottom

The reinterpretation of the time and deep sections along CDP Profile 1632 revealed different previously unknown structural features: (1) a buried bar and a Late Pliocene regional unconformity, the Bol’sheretsk and Lebed subaerial shield volcanoes, and the Koni-P’yagina and Magadan megadikes at its l...

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Bibliographic Details
Published in:Russian journal of Pacific geology 2009-06, Vol.3 (3), p.201-209
Main Authors: Lomtev, V. L., Patrikeev, V. N., Gurinov, M. G.
Format: Article
Language:English
Subjects:
Diapirs
Earth and Environmental Science
Earth Sciences
Geology
Marine geology
Oceans
Pliocene
Studies
Unconformity
Volcanoes
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Summary:The reinterpretation of the time and deep sections along CDP Profile 1632 revealed different previously unknown structural features: (1) a buried bar and a Late Pliocene regional unconformity, the Bol’sheretsk and Lebed subaerial shield volcanoes, and the Koni-P’yagina and Magadan megadikes at its level; (2) morphological evidence for the nappe structure of the Okhotsk Arch (homoclinal thrust slices of the acoustic basement with ramp half-grabens in the frontal part and a pull-apart zone with a solitary diapir in the Kol’skii Trough, which divides the arch into two allochthonous megablocks with opposite vergence of their thrusts), which is related to a divergent sheet decollement, probably, at the M discontinuity.
ISSN:1819-7140
1819-7159
DOI:10.1134/S1819714009030014