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Main Types of Aptian–Cenomanian Sedimentary Rocks on Guyots of the Magellan Mountains, Pacific Ocean

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Abstract

The typical rocks composing the base of the sedimentary cover of the guyots on the Magellan Seamounts are described. The upper part of the volcanic basement of the guyots is overlain by Aptian deposits of shallow reef ecosystems represented by terrigenous (beach) and organic-chemical (coral, shell-and-detritus, and oolitic) carbonate rocks. These deposits encircle the western part of the Fedorov and Ilyichev guyots, and the satellite buildings of the Alba and Pallada guyots in the form of an almost complete ring, extending from the edge of the plateau summit to 2500–3000 m depth. Down the slope they are replaced by planktonic (nanoforaminiferal) sediments and edaphogenic breccias. The appearance of pelagic limestone is associated with a sea-level rise during the Late Albian–Cenomanian eustatic transgression. Exposures of reef and planktonic limestones of up to 300 km2 in area are also recorded on some guyots.

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ACKNOWLEDGMENTS

The present work on facial analysis of Cretaceous–Cenozoic rocks on the guyots of the Magellan Seamounts was planned to be made together with M.E. Mel’nikov when he was still alive. This is the first report characterizing the most ancient sedimentary rocks of the study area. In memory of Mel’nikov, a brilliant researcher who considerably contributed to the geological studies of the Magellan Seamounts, we plan to continue the publications on the Santonian–Maastrichtian, Paleogene, and Miocene–Pleistocene sedimentary rocks.

Funding

The work was implemented in the framework of the State Contract no. 0271-2019-0005 for the Ilyichev Pacific Oceanological Institute, Far East Branch of the Russian Academy of Sciences.

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

    S. P. Pletnev

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  1. S. P. Pletnev
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Correspondence to S. P. Pletnev.

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Recommended for publishing by I.B. Tsoi

Translated by N. Astafiev

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Pletnev, S.P. Main Types of Aptian–Cenomanian Sedimentary Rocks on Guyots of the Magellan Mountains, Pacific Ocean. Russ. J. of Pac. Geol. 13, 436–445 (2019). https://doi.org/10.1134/S1819714019050087

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  • DOI: https://doi.org/10.1134/S1819714019050087

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