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Determining the provenance, recurrence, magnitudes and failure mechanisms of submarine landslides from the Moroccan margin and Canary Islands using distal turbidite records

Determining the provenance, recurrence, magnitudes and failure mechanisms of submarine landslides from the Moroccan margin and Canary Islands using distal turbidite records
Determining the provenance, recurrence, magnitudes and failure mechanisms of submarine landslides from the Moroccan margin and Canary Islands using distal turbidite records
The Moroccan continental margin and Canary Islands have been subjected to repeat submarine mass wasting. This thesis aims to investigate the sediment gravity flow deposits associated with these submarine landslides. The Agadir Basin represents a deepwater depocentre and conduit for turbidity currents sourced from the Agadir Canyon and Western Canary Islands. A previous basin stratigraphy is re-analysed and extended to cover the last 600 ka. This stratigraphy is validated by using down-core geophysics and chemostratigraphy. ITRAX mudcap geochemistry has been used to assess turbidite provenance. Siliciclastic turbidites in this record have been shown to occur predominantly at transitions from glacial to interglacial periods.

The latest landslides identified from the Western Canary Islands, the El Golfo and Icod landslides, have been proposed to be multistage. This is based on the presence of multiple fining-upwards sequences, known as subunits, within the associated sediment gravity flow deposits. Grain-size data, core petrophysics, bulk geochemistry and volcanic glass geochemistry has shown that the subunits within the Icod deposit originate from a multistage collapse. The Late Quaternary volcaniclastic turbidites in the Madeira Abyssal Plain in the last 1.5 Ma are also investigated, and found to potentially represent the El Golfo, Icod, Cumbre Nueva, Orotava, El Julán, Güímar, Tinor and Rogues de García landslides from the Western Canary Islands. These deposits also represent multistage landslides, which show that this failure mechanism is more common and has major implications for tsunamigenesis. Furthermore, analysis of ODP volcaniclastic turbidites (0- 17 Ma) shows that deposits are coincidental in age and provenance with periods of voluminous and explosive volcanism on specific islands.
Hunt, James Edward
528a3900-7340-4be1-9a2e-8fdbb7ba0cf5
Hunt, James Edward
528a3900-7340-4be1-9a2e-8fdbb7ba0cf5
Wynn, Russell
72ccd765-9240-45f8-9951-4552b497475a
Connelly, Douglas
d49131bb-af38-4768-9953-7ae0b43e33c8
Teagle, Damon
396539c5-acbe-4dfa-bb9b-94af878fe286

(2012) Determining the provenance, recurrence, magnitudes and failure mechanisms of submarine landslides from the Moroccan margin and Canary Islands using distal turbidite records. University of Southampton, School of Ocean and Earth Science, Doctoral Thesis, 386pp.

Record type: Thesis (Doctoral)

Abstract

The Moroccan continental margin and Canary Islands have been subjected to repeat submarine mass wasting. This thesis aims to investigate the sediment gravity flow deposits associated with these submarine landslides. The Agadir Basin represents a deepwater depocentre and conduit for turbidity currents sourced from the Agadir Canyon and Western Canary Islands. A previous basin stratigraphy is re-analysed and extended to cover the last 600 ka. This stratigraphy is validated by using down-core geophysics and chemostratigraphy. ITRAX mudcap geochemistry has been used to assess turbidite provenance. Siliciclastic turbidites in this record have been shown to occur predominantly at transitions from glacial to interglacial periods.

The latest landslides identified from the Western Canary Islands, the El Golfo and Icod landslides, have been proposed to be multistage. This is based on the presence of multiple fining-upwards sequences, known as subunits, within the associated sediment gravity flow deposits. Grain-size data, core petrophysics, bulk geochemistry and volcanic glass geochemistry has shown that the subunits within the Icod deposit originate from a multistage collapse. The Late Quaternary volcaniclastic turbidites in the Madeira Abyssal Plain in the last 1.5 Ma are also investigated, and found to potentially represent the El Golfo, Icod, Cumbre Nueva, Orotava, El Julán, Güímar, Tinor and Rogues de García landslides from the Western Canary Islands. These deposits also represent multistage landslides, which show that this failure mechanism is more common and has major implications for tsunamigenesis. Furthermore, analysis of ODP volcaniclastic turbidites (0- 17 Ma) shows that deposits are coincidental in age and provenance with periods of voluminous and explosive volcanism on specific islands.

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Published date: May 2012
Organisations: University of Southampton, Ocean and Earth Science

Identifiers

Local EPrints ID: 351339
URI: http://eprints.soton.ac.uk/id/eprint/351339
PURE UUID: e7c15dda-2a15-4b97-84b1-2c568e8a75a6
ORCID for Damon Teagle: ORCID iD orcid.org/0000-0002-4416-8409

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Date deposited: 18 Apr 2013 13:16
Last modified: 06 Jun 2018 12:52

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Contributors

Author: James Edward Hunt
Thesis advisor: Russell Wynn
Thesis advisor: Douglas Connelly
Thesis advisor: Damon Teagle ORCID iD

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