Late Cretaceous and Cenozoic paleoceanography from north-east Atlantic ferromanganese crust microstratigraphy

Josso, Pierre; Rushton, Jeremy ORCID: https://orcid.org/0000-0001-5931-7537; Lusty, Paul; Matthews, Adam; Chenery, Simon; Holwell, David; Kemp, Simon J. ORCID: https://orcid.org/0000-0002-4604-0927; Murton, Bramley ORCID: https://orcid.org/0000-0003-1522-1191. 2020 Late Cretaceous and Cenozoic paleoceanography from north-east Atlantic ferromanganese crust microstratigraphy. Marine Geology, 422, 106122. 10.1016/j.margeo.2020.106122

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Official URL: http://dx.doi.org/10.1016/j.margeo.2020.106122

Abstract/Summary

Oceanic hydrogenetic ferromanganese (Fe-Mn) crusts precipitate directly from ambient seawater over millions of years. Their very slow growth rates and physio-chemical properties mean that they adsorb numerous elements from seawater. As such, they provide condensed records of seawater evolution through time that can be used for paleoceanographic reconstruction. Here, we present the results of a high-resolution, stratigraphic, textural and geochemical investigation of a core sample, obtained from a Fe-Mn crust pavement, located on the summit of Tropic Seamount in the tropical north-east Atlantic Ocean. A number of observations and interpretations are proposed, within the context of a well-constrained age model, spanning the last 75 ± 2 Myr. This core has textural stratigraphic coherence with Pacific Fe-Mn crusts formed since the Late Cretaceous, highlighting that global oceanic and climatic phenomena exert first-order controls on Fe-Mn crust development. All major hiatuses observed in the Fe-Mn crusts are contemporaneous with erosion events occurring throughout the Atlantic Ocean. High-resolution geochemical data indicate that there is variability in the composition of Fe-Mn crusts at the cm to μm scale. The dominant factors controlling this include major oceanographic events, mineral textures and micro-topography.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1016/j.margeo.2020.106122
ISSN:	00253227
Date made live:	10 Feb 2020 07:02 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/526771

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1016/j.margeo.2020.106122

ISSN:

00253227

Date made live:

10 Feb 2020 07:02 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/526771