Increasing Control of Crustal Tectonics on Salt Tectonics from Mediterranean examples

Gaullier, Virginie; Gaia, Travan

Document type :

Autre communication scientifique (congrès sans actes - poster - séminaire...): Communication dans un congrès avec actes

Title :

Increasing Control of Crustal Tectonics on Salt Tectonics from Mediterranean examples

Author(s) :

Gaullier, Virginie [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Gaia, Travan [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]

Conference title :

Mediterranean Geosciences Union, MedGU-23 Annual Meeting

City :

Istanbul

Country :

Turquie

Start date of the conference :

2023-11-26

English keyword(s) :

Salt Tectonics
Crustal Tectonics
Seismics
Analogue Modeling
Gravity spreading
Gravity Gliding

English abstract : [en]

The deposition during the huge Messinian Salinity Crisis (MSC, 5.96 - 5.33 My) of a thick layer of evaporites and especially of a mobile halite unit (MU) has deeply inﬂuenced the architecture and evolution of the Mediter-ranean ...
Show more >The deposition during the huge Messinian Salinity Crisis (MSC, 5.96 - 5.33 My) of a thick layer of evaporites and especially of a mobile halite unit (MU) has deeply inﬂuenced the architecture and evolution of the Mediter-ranean margins. The Mediterranean has characteristics that set it apart from most “classic” salt-bearing basins, where salt was deposited after (or right after) the rifting stage. Conversely, in the Mediterranean, salt was not related to a rifting event and it covers vast areas that are geodynamically active presently. These include regions of divergence (Tyrrhenian Sea), young or mature convergence (Algerian and Ligurian Margins, Ionian Sea, Mediterra-nean Ridge), oblique convergence (Eastern Cyprus Arc), and strike-slip (Levant Basin). Despite the progress in seismic processing, the strong acoustic impedance contrast between salt and sediments prevents an accu-rate seismic imaging of the sub-salt deep structures. Second, the evaporites act as a decoupling layer (thin-skinned tectonics) preventing the propaga-tion of the crustal structures towards the surface. Last, when crustal tecton-ics generates horizontal and vertical movements in the basement, these movements can trigger a gravitational response in the salt and its overbur-den, thereby blurring the deeper tectonic signal. In order to bypass these difﬁculties, we propose to use salt tectonics as a proxy to better constrain these deep structures both in terms of geometry and timing. Furthermore, the comparison between natural examples (seismic data) with analogue model-ling allows a better understanding of the margins’ structure and evolution. We present here a synthesis of several Mediterranean study cases in differ-ent geodynamical settings (divergence, convergence, strike-slip) with an in-creasing impact of the crustal tectonics on the salt tectonics. The complexi-ty and variety of its margins, along with the presence of a widely distribut-ed Messinian salt décollement, make the Mediterranean the perfect area to analyze salt deformation and its relationships with different tectonic styles, including the effects of crustal activity. Salt tectonics therefore provides a powerful tool to understand the deep crustal tectonics of the margins and to better constrain the timing of the crustal reactivation in the Mediterranean.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL

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