STRUCTURE FEATURES AND HISTORY OF DEVELOPMENT OF THE NORTHWESTERN PART OF THE PACIFIC OCEAN BOTTOM

V. L. Lomtev

doi:10.15356/0435-4281-2016-2-59-71

STRUCTURE FEATURES AND HISTORY OF DEVELOPMENT OF THE NORTHWESTERN PART OF THE PACIFIC OCEAN BOTTOM

V. L. Lomtev

https://doi.org/10.15356/0435-4281-2016-2-59-71

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Abstract

According to results of interpretation of data of high (120–150 Hz) frequency SCP (seismic continuous profiling), CDP1 (common depth point method) profile and drilling it was found that the NW Pacific abyssal floor is composed by marine and continental series of Late Precambrian-Phanerozoic (sedimentary-trappean cover). Facies of three oceans (earley epicontinental Tethys of Riphean-Paleozoic, late epicontinental Tethys of Late Mesozoic, deep-sea Pacific ocean of Neogene-Quaternary) and intermediate subaerial epochs (Pacifida paleolands) were eliminated. Boundaries of Layers 1–5 and Meso-Cenozoic cover are parallels and gentle incline to the SE from outer rise that is typically for platforms with long inherited development. The cover of old platform break divergent gravitational glide of Layers 1–4 on outer rise slopes in the Neogene-Quaternary. Mesozoic history is connected with mainly land traps, transgression of late Tethys in Jurassic-Early Cretaceous and shallow accumulation of carbonate strata A. Then the sea step back to SE with formation of seacoast series B and draining of region in the Uppermost Early-Late Cretaceous-Paleogene, partly Early Miocene, when here accumulate loesses of Pacifida paleoland (horizon C), fl ooded waters of the young Pacific ocean. Its facieses (strata D1,2) are composed the abyssal fl oor and present of canyon fans on the outer rise and Kamchatka contour megacone in the Tuskarora basin. Fan outbuilding continues before Middle Pleistocene (Japan and Kuril-Kamchatka trench formation as turbidite traps).

Keywords

North-West Pacific abyssal fl oor, glide of Layers 1–4, Meso-Cenozoic cover, paleoland, astrobleme, paleoshelf, deep-sea fans

About the Author

V. L. Lomtev

Institute of Marine Geology and Geophysics, Yuzhno-Sakhalinsk
Russian Federation

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Review

For citations:

Lomtev V.L. STRUCTURE FEATURES AND HISTORY OF DEVELOPMENT OF THE NORTHWESTERN PART OF THE PACIFIC OCEAN BOTTOM. Geomorfologiya. 2016;(2):59-71. (In Russ.) https://doi.org/10.15356/0435-4281-2016-2-59-71