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The Main Types of Paleogene Sedimentary Rocks and Conditions of their Formation on the Guyots of the Magellan Seamounts (Pacific Ocean)

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Abstract

he Paleocene–Eocene sedimentary complex is most widely developed among the sedimentary cover deposits of the Magellan Seamounts. It is composed of pelagic (nanoforaminiferal) and reef limestones, edaphogenic breccias and volcanoclastic rocks. The most widespread pelagic limestones form narrow (0.5–1.5 km) and extensive (up to 20 km) ribbon-like bodies that cover the upper parts of the slopes and the rim of the summit plateau. The maximum area of their distribution, which covers 315 km2, is noted on the Fedorov Guyot. Pelagic limestones and edaphogenic breccias outcrop over large areas and have reciprocal facies transitions. The Oligocene hiatus in sedimentation has been established in the sections of the Cenozoic sedimentary cover deposits of the studied guyots.

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ACKNOWLEDGMENTS

The work devoted to the facies analysis of Cretaceous–Cenozoic rocks on the guyots of the Magellan Seamounts was projected and discussed jointly with M.E. Melnikov, when he was alive. This publication has been prepared in memory of this remarkable researcher.

Funding

This study was performed within the framework of the State Assignment registration number AAAA-A17-117030110033-0.

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Authors and Affiliations

  1. Ilyichev Pacific Oceanological Institute, Far East Branch, Russian Academy of Sciences, 690041, Vladivostok, Russia

    S. P. Pletnev

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Correspondence to S. P. Pletnev.

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Recommended for publishing I.B. Tsoy

Translated by N. Kovriga

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Pletnev, S.P. The Main Types of Paleogene Sedimentary Rocks and Conditions of their Formation on the Guyots of the Magellan Seamounts (Pacific Ocean). Russ. J. of Pac. Geol. 15, 72–83 (2021). https://doi.org/10.1134/S1819714021010061

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