Untangling the complex origin of turbidite activity on the Calabrian Arc (Ionian Sea) over the last 60ka

Köng, Eléonore; Zaragosi, Sébastien; Schneider, Jean-Luc; Garlan, Thierry; Bachèlery, Patrick; Pedro, Laurine San; Seibert, Chloé; Racine, Calypso

doi:10.1016/j.margeo.2015.12.010

Cited by 13 publications

(20 citation statements)

References 61 publications

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“… Reconstruction of the main underwater flows and their triggered on the Calabrian Arc and the western Mediterranean Ridge. Data for cores KC01 and KC14 derives from Köng et al (). Acronyms correspond to: WL: Calabrian Arc western lobe, EL: Calabrian Arc eastern lobe, IAP: Ionian abyssal plain, Co: corridor between the Calabrian Arc and the Mediterranean Ridge, HT: Hellenic Trench.…”

Section: Discussionsupporting

confidence: 68%

“…They also deduced mean return times of around 500 years, although this varies between 100 and 700 years within the sapropel S1 deposit. The most recent study by Köng et al () highlights different return times depending on the area in the western part of the Calabrian Arc over the last 60 kyrs: they vary between 450 and 1,000 years in the post‐Messinian ridge (KC14) and are shorter in the Ionian abyssal plain (KC01) of around 240 years. On the Mediterranean Ridge, few studies are related to the turbidite activity on this accretionary wedge.…”

Section: Discussionmentioning

confidence: 93%

“…They can be related either to co‐seismic events associated with the propagation of tsunami waves (Cita & Aloisi, ; Polonia et al, 2013a), or to low sea level periods associated with destabilization of the continental shelf or gas hydrates as described by Reeder et al () and Rothwell et al () in the Levantine basin and the occidental Mediterranean basin. On the Calabrian Arc and the Ionian abyssal plain, turbidite activity has been linked to seismic and/or tsunamis by Kastens (), Polonia et al (a, b, ), San Pedro et al () for the Holocene and more recently for the last 60 ka by Köng et al ().…”

Section: Sedimentological Backgroundmentioning

confidence: 99%

“…The formation of these two accretionary wedges over a million years scale (Coy et al, ; Dewey & Sengör, ; Gallais et al, ; van Dijk & Scheepers, ; Truffert, ) as well as their morphology and present day functioning have been widely studied (D'Agostino et al, ; Gutscher et al, ; Huguen et al, ; Kreemer & Chamot‐Rooke, ; Polonia et al, ; Tortorici et al, ). For the last thousand years, Polonia et al (b, ) has focused initially on the Holocene's palaeoseismology based on turbidite record and, more recently, studies have been extended to the last 60 ka (Köng et al, ). Between these two time scales (million years and the last thousand years) few studies deal with the turbidite record in active margin.…”

Section: Introductionmentioning

confidence: 99%

“…This study try to reconstruct the turbidite activity over a span of hundred thousand years on the wedges in the Ionian Sea. This area have been described as a good place to conduct palaeoseismologic studies for three reasons: (1) the majority of debris flows, turbidites and sliding seem to be distinctive earthquakes‐triggered structure (Kastens, ; Köng et al, ; Polonia et al, a, b, ; San Pedro et al, ), (2) sapropels and tephra provide a suitable means of dating events (Kastens, ; Löwemark et al, ), (3) glacio‐eustatism influence is expected to be minor if the area is disconnected from the shelf (Kastens, ). This study attempts to decipher which control factor (sea level changes, earthquakes and volcanism) dominates the triggering of gravity‐driven sedimentation recorded on ridge and slope basins of the Calabrian Arc and the Mediterranean Ridge over the last 330,000 years.…”

Section: Introductionmentioning

confidence: 99%

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Gravity‐Driven Deposits in an Active Margin (Ionian Sea) Over the Last 330,000 Years

Köng

Zaragosi

Schneider

et al. 2017

Geochem Geophys Geosyst

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In the Ionian Sea, the subduction of the Nubia plate underneath the Eurasia plate leads to an important sediment remobilization on the Calabrian Arc and the Mediterranean Ridge. These events are often associated with earthquakes and tsunamis. In this study, we analyze gravity‐driven deposits in order to establish their recurrence time on the Calabrian Arc and the western Mediterranean Ridge. Four gravity cores collected on ridges and slope basins of accretionary prisms record turbidites, megaturbidites, slumping and micro‐faults over the last 330,000 years. These turbidites were dated by correlation with a hemipelagic core with a multi‐proxy approach: radiometric dating, δ18O, b* colour curve, sapropels and tephrochronology. The origin of the gravity‐driven deposits was studied with a sedimentary approach: grain‐size, lithology, thin section, geochemistry of volcanic glass. The results suggest three periods of presence/absence of gravity‐driven deposits: a first on the western lobe of the Calabrian Arc between 330,000 and 250,000 years, a second between 120,000 years and present day on the eastern lobe of the Calabrian Arc and over the last 60,000 years on the western lobe, and a third on the Mediterranean Ridge over the last 37,000 years. Return times for gravity‐driven deposits are around 1,000 years during the most important record periods. The turbidite activity also highlights the presence of volcaniclastic turbidites that seems to be link to the Etna changing morphology over the last 320,000 years.

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Section: Discussionsupporting

confidence: 68%

Section: Discussionmentioning

confidence: 93%

Section: Sedimentological Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gravity‐Driven Deposits in an Active Margin (Ionian Sea) Over the Last 330,000 Years

Köng

Zaragosi

Schneider

et al. 2017

Geochem Geophys Geosyst

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Acquisition of detrital magnetization in four turbidites

Tanty

Valet

Carlut

et al. 2016

Geochem Geophys Geosyst

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Turbiditic events are mostly avoided in paleomagnetic studies and therefore their remanence and magnetic properties are poorly described. Turbidites are exempt of bioturbation and potentially provide pertinent information about depositional remanence. We studied four quaternary turbidites of different origins in marine sediment cores. Upward fining of both magnetic and sedimentary fractions indicates that coarser grains reached the bottom first. We observe a progressive shallowing of the magnetic inclinations between the upper and bottom layers of the turbidites that increases with the size of the events and obeys a simple linear scaling law. Measurements of magnetic anisotropy suggest that hydrodynamic conditions prevailing during deposition seem to be dominant for the alignment of the magnetic grains. We suggest that small spherical grains are randomly oriented with zero resultant magnetization in presence of strong turbulent conditions, while the alignment of elongated grains is constrained by the competition between gravity and magnetic forces. A possible scenario is that under turbulent conditions they tend to rest at the bottom with their long axes parallel to the sediment surface and therefore with shallow inclinations, whereas weakly turbulent conditions like during the smallest (26 cm thick) event do not disturb the magnetic alignment and therefore do not generate inclination shallowing.

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Understanding the Geological History of Volcanoes: An Essential Prerequisite to Their Monitoring

Bachèlery¹

2022

Hazards and Monitoring of Volcanic Activity 1

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Untangling the complex origin of turbidite activity on the Calabrian Arc (Ionian Sea) over the last 60ka

Cited by 13 publications

References 61 publications

Gravity‐Driven Deposits in an Active Margin (Ionian Sea) Over the Last 330,000 Years

Gravity‐Driven Deposits in an Active Margin (Ionian Sea) Over the Last 330,000 Years

Acquisition of detrital magnetization in four turbidites

Understanding the Geological History of Volcanoes: An Essential Prerequisite to Their Monitoring

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