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FROM ALLUVIAL FAN TO DISTAL TURBIDITIC SYSTEMS: PRELIMINARY RESULTS ON DEEP-WATER BYPASS PROCESSES BASED ON GILBERT-TYPE FAN DELTA OUTCROPS OF THE CORINTH RIFT (GREECE).

Abstract : Source-to-sink (S2S) can be seen as the integration with other earth science disciplines; from geomorphology, sedimentary geology to basin geodynamic analysis. A major limitation to go further is the access to the entire basin geometry (proximal to distal setting, “closed” box, deep crustal and lithospheric geometries) as well as age constrains. We present the preliminary results of a sedimentological and sequence stratigraphy analysis of outcropping Gilbert-type deltas from the Corinth rift (Plio-Pleistocene). Drone acquisition has also been carried out to propagate the correlations in 3D along steep cliffs. The study case provides an unique opportunity to describe the sedimentary facies and correlated them though space and time from the proximal to the most distal setting, in a very well constrained basin geometry and timing. In this communication, we will mainly focus on deepwater sediment bypass in terms of flow processes and associated stratigraphic expression, as it is a key issue to address sedimentary budget analysis in a S2S perspective. A new bottomset typology has been established including 4 end-members: (1) Gravely bottomset, (2) Major erosion – by pass, (3) Fine-grained starved bottomset, and (4) Deep Water Massive Sand (DWMS) bottomset. The relationship between the bottomset end-members and their associated turbiditic system has also been characterized. (1) During Gravely bottomset deposition, unconfined to low relief channel-levee complex occurs at the very end of the bottomset. (2) The major erosion in bottomset occurs when the foresets present a maximal progradation rate, the bottomset is eroded and bypassed. Coarse- to fine-grained sediments are exported in the turbiditic system to form large channel-levee complex. (3) During Fine-grained starved bottomset deposition, limited amount of sediment feed the turbiditic system from the delta. Indeed, the major part of the sediments is stored in topset and foreset areas. (4) Deep water massive sand bottomset forms coarse-grained slope apron geometry on the delta toe. Coarse-grained material is massively stored in the bottomset, and only fine-grained sediments are exported to the turbiditic system to form lobe complex. Superimposed onto this dynamic, evidences of contouritic events have also been identified.
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https://hal-insu.archives-ouvertes.fr/insu-01406574
Contributor : Isabelle Dubigeon <>
Submitted on : Thursday, December 1, 2016 - 12:46:57 PM
Last modification on : Friday, May 29, 2020 - 2:44:02 PM

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Romain Rubi, Sébastien Rohais, Sylvie Bourquin, Isabelle Moretti, Guy Désaubliaux. FROM ALLUVIAL FAN TO DISTAL TURBIDITIC SYSTEMS: PRELIMINARY RESULTS ON DEEP-WATER BYPASS PROCESSES BASED ON GILBERT-TYPE FAN DELTA OUTCROPS OF THE CORINTH RIFT (GREECE).. Source to Sink: a long term perspective of sediment budgets and sources characterization, Géosciences-Rennes, Nov 2016, Rennes, France. pp.92. ⟨insu-01406574⟩

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