La Galite Archipelago (Tunisia, North Africa): stratigraphic and petrographic revision and insights for geodynamic evolution of the Maghrebian Chain


Autoria(s): Belayouni, Habib; Brunelli, Daniele; Clocchiatti, Roberto; Di Staso, Angelida; El Hassani, Iz-Eddine El Amrani; Guerrera, Francesco; Kassaa, Samia; Ouazaa, Nejia Laridhi; Martín-Martín, Manuel; Serrano Lozano, Francisco; Tramontana, Mario
Contribuinte(s)

Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente

Evolución Geodinámica de la Cordillera Bética Oriental y de la Plataforma Marina de Alicante

Data(s)

22/03/2013

22/03/2013

01/01/2010

Resumo

The location of the La Galite Archipelago on the Internal/External Zones of the Maghrebian Chain holds strong interest for the reconstruction of the geodynamic evolution of the Mesomediterranean Microplate-Africa Plate Boundary Zone. New stratigraphic and petrographic data on sedimentary successions intruded upon by plutonic rocks enabled a better definition of the palaeogeographic and palaeotectonic evolutionary model of the area during the early-middle Miocene. The lower Miocene sedimentary units (La Galite Flysch and Numidian-like Flysch) belong to the Mauritanian (internal) and Massylian (external) sub-Domains of the Maghrebian Chain, respectively. These deposits are related to a typical syn-orogenic deposition in the Maghrebian Flysch Basin Domain, successively backthrusted above the internal units. The backthrusting age is post-Burdigalian (probably Langhian-Serravallian) and the compressional phase represents the last stage in the building of the accretionary wedge of the Maghrebian orogen. These flysch units may be co-relatable to the similar well-known formations along the Maghrebian and Betic Chains. The emplacement of potassic peraluminous magmatism, caused local metamorphism in the Late Serravallian-Early Tortonian (14–10 Ma), after the last compressional phase (backthrusting), during an extensional tectonic event. This extensional phase is probably due to the opening of a slab break-off in the deep subduction system. La Galite Archipelago represents a portion of the Maghrebian Flysch Basin tectonically emplaced above the southern margin of the “Mesomediterranean Microplate” which separated the Piemontese-Ligurian Ocean from a southern oceanic branch of the Tethys (i.e. the Maghrebian Flysch Basin). The possible presence of an imbricate thrust system between La Galite Archipelago and northern Tunisia may be useful to exclude the petroleum exploration from the deformed sectors of the offshore area considered.

Research supported by: MIUR-Urbino University, Cofin/2003 Grant (responsible F. Guerrera); CGL2005-03887 and CGL2009-09249 (Spanish Ministry of Education and Science) and Research Groups and projects of the Generalitat Valenciana from Alicante University (CTMA-IGA). D.B. and R.C. have been supported by European Community’s Human Potential Programme under contract HPRN-CT-2002-000211 [EUROMELT] D.B. has been also supported by PRIN/COFIN 2007.

Identificador

BELAYOUNI, Habib, et al. “La Galite Archipelago (Tunisia, North Africa): stratigraphic and petrographic revision and insights for geodynamic evolution of the Maghrebian Chain”. Journal of African Earth Sciences. Vol. 56, No. 1 (Jan. 2010). ISSN 1464-343X, pp. 15-28

1464-343X (Print)

1879-1956 (Online)

http://hdl.handle.net/10045/27485

10.1016/j.jafrearsci.2009.05.004

Idioma(s)

eng

Publicador

Elsevier

Relação

http://dx.doi.org/10.1016/j.jafrearsci.2009.05.004

Direitos

info:eu-repo/semantics/restrictedAccess

Palavras-Chave #Stratigraphy #Granodiorite #Palaeogeography #Palaeotectonics #Miocene #La Galite Archipelago #Geodinámica Interna
Tipo

info:eu-repo/semantics/article