Messinian evaporite deposition during sea level rise in the Gulf of Lions (Western Mediterranean)

François Bache; Julien Gargani; Jean-Pierre Suc; Christian Gorini; Marina Rabineau; Speranta - Maria Popescu; Estelle Leroux; Damien Do Couto; Gwenaël Jouannic; Jean-Loup Rubino; Jean-Louis Olivet; Georges Clauzon; Antonio Tadeu dos Reis; Daniel Aslanian

Messinian evaporite deposition during sea level rise in the Gulf of Lions (Western Mediterranean)

François Bache ¹ Julien Gargani ² Jean-Pierre Suc ³ Christian Gorini ³ Marina Rabineau ⁴ Speranta - Maria Popescu ⁵ Estelle Leroux ^{4, 6} Damien Do Couto ^{3, 7} Gwenaël Jouannic ⁸ Jean-Loup Rubino ⁷ Jean-Louis Olivet ⁶ Georges Clauzon ⁹ Antonio Tadeu dos Reis ¹⁰ Daniel Aslanian ⁶

1 GNS Science [Lower Hutt]

2 GEOPS - Géosciences Paris Sud

3 iSTeP - Institut des Sciences de la Terre de Paris

4 IUEM - Institut Universitaire Européen de la Mer

5 GeoBioStratData.Consulting

6 GM - Unité de recherche Géosciences Marines (Ifremer)

7 TOTAL S.A.

8 CETE Est - Centre d'études techniques de l'équipement Est

9 CEREGE - Centre européen de recherche et d'enseignement de géosciences de l'environnement

10 Departamento de Oceanografia Geológica - Faculdade de Oceanografia

Abstract : The Messinian Salinity Crisis resulted from desiccation of the Mediterranean Sea after its isolation from the Atlantic Ocean at the end of the Miocene. Stratal geometry tied to borehole data in the Gulf of Lions show that the pre-crisis continental shelf has been eroded during a major sea-level fall and that sediments from this erosion have been deposited in the basin. This detrital package is onlapped by high amplitude seismic reflectors overlain by the "Messinian Salt" and the "Upper Evaporites". Towards the shelf, the transition between regressive deposits and overlying onlapping sediments is characterised by a wave-ravinement surface, suggesting that a significant part of the onlapping reflectors and overlying Messinian Evaporites were deposited during a relatively slow landward migration of the shoreline. The clear boundary between the smooth wave-ravinement surface and the subaerial Messinian Erosional Surface observed on the Gulf of Lions shelf and onshore in the Rhône valley is interpreted to have resulted from a rapid acceleration of the Mediterranean sea level rise at the end of the Messinian Salinity Crisis. Numerical simulation of this cycle of sea level change during the Messinian Salinity Crisis and of precipitation of thick evaporites during the slow sea level rise shows that this scenario can be modelled assuming a value of evaporation minus precipitation of 1.75 m 3 /m 2 /yr in the deep Mediterranean basins.

Document type :

Journal articles

Domain :

Sciences of the Universe [physics] / Earth Sciences / Stratigraphy

Sciences of the Universe [physics] / Earth Sciences / Geophysics [physics.geo-ph]

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Submitted on : Thursday, July 25, 2019 - 10:33:13 AM
Last modification on : Wednesday, October 16, 2019 - 2:24:54 PM

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