Multi-scale and multi-parametric analysis of Late Quaternary event deposits within the active Corinth Rift (Greece)

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1111/sed.12964. This is version 4 of this Preprint.

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Authors

Gino de Gelder , Mai-Linh Doan, Christian Beck, Julie Carlut, Chloe Seibert, Nathalie Feuillet, Gareth D. O. Carter, Sofia Pechlivanidou , Robert Leslie Gawthorpe

Abstract

A major challenge in subaqueous paleoseismology is to understand the relationship between an earthquake/tsunami and a sedimentary event deposit recorded in drillcores. Expedition 381 of the International Ocean Discovery Program was dedicated to understanding the development of the Corinth Rift, Greece. Its drilled cores provide a potentially important resource to better understand depositional mechanisms of sedimentary event deposits within changing open marine to (semi-)isolated environments. To achieve this, we analyse U- channels and spatula samples from the topmost part (0-65 m below seafloor maximum depth) of holes M0078B and M0079A (~0-25 ka), using high-resolution X-Ray microtomography in combination with grain-size, magnetic and XRF measurements. Structures and grain array are resolved down to 10 μm in voxel size, characterizing the geometry of the basal surface of turbidite+homogenite sedimentary event deposits, and the internal base-upwards evolution at high-resolution scale. Our analysis suggests these types of deposits are more complex than previously proposed, especially at the transition between the basal coarse turbidite sub-unit and the fine-grained homogenite upper sub-unit, as well as within the homogenite. Combined with the other observations and parameters, X-ray microtomography results are consistent with the interpretation of the Corinth turbidite+homogenite deposits as having predominantly originated from seismic and/or aseismic slope failures followed by tsunami/seiche effects, despite subtle differences according to depositional environment.

DOI

https://doi.org/10.31223/X5DW4M

Subjects

Earth Sciences

Keywords

turbidites, Corinth Rift, homogenites, earthquakes, tsunamis, microtomography, Corinth Rift; IODP Expedition 381, homogenites, microtomography, IODP-381

Dates

Published: 2021-03-17 07:43

Last Updated: 2022-01-24 14:37

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License

CC BY Attribution 4.0 International

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Conflict of interest statement:
None

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