Moulay Charaf Chabou

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Yamina Mahdjoub

University of Sciences and Technology Houari Boumediene

Saïd Maouche

Centre de Recherche en Astronomie Astrophysique et Géophysique

Nacer-Eddine Merabet

Centre de Recherche en Astronomie Astrophysique et Géophysique

Mejda Amira Boussada

Centre de Recherche en Astronomie Astrophysique et Géophysique

Mohamed Ayache

Laboratoire des Sciences du Climat et de l'Environnement

Tahar Aı̈fa

Géosciences Rennes

Cooperative Institutions

Centre de Recherche en Astronomie Astrophysique et Géophysique

University of Sciences and Technology Houari Boumediene

Centre National de la Recherche Scientifique

University Ferhat Abbas of Setif

University of Algiers Benyoucef Benkhedda

Office National de la Météorologie

École Normale Supérieure de Bouzareah Alger

Centre Universitaire de Tamanrasset

Centre de Recherche Nucléaire d’Alger

Continental (United States)

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A new Jurassic paleomagnetic data and emplacementconditions study of the CAMP Gara Djebilet dykes (TindoufBasin, Southwest Algeria).

Nacer-Eddine Merabet Mejda Amira Boussada Yamina Mahdjoub Saïd Maouche Moulay Charaf Chabou

The Central Atlantic Magmatic Province (CAMP) is one of the largest identified Mesozoic basalt provinces formed approximately 200 Ma ago as a preamble to the Pangea dismemberment. Recent 40Ar/39Ar dating and geochemical analyses of dolerite sills and dykes and basalt lava flows in southwestern Algeria (Bechar area, Reggane, Hank and Tindouf basins) showed that these rocks are parts of the CAMP. These data represented good arguments to perform geological field observations and sampling for paleomagnetic and magnetic fabric (AMS) investigations in the Tindouf basin CAMP formations. Three NE-SW oriented long doleritic dykes (198.9 ±1.8 Ma) in this basin were targeted in order to find out the structural context of their emplacement (magnetic fabric) and to determine a new reliable Jurassic pole. The magnetic fabric, in almost the whole sampled sections, is defined mainly by clustering of k1 and k2 axes on the dyke plane whereas the k3 axis is nearly perpendicular to it. This fabric is therefore interpreted as due to magma flow. The new Jurassic paleomagnetic pole, of a good quality, is very close to those obtained from coeval detrital Algerian Saharan formations and those recently determined from coeval Moroccan igneous formations, it is also very close to the 200 Ma mean African pole. These results constitute a considerable contribution to a more precise knowledge of the geodynamical context during this period.

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Paleomagnetic and magnetostructural study of the Gara Djebilet Jurassic magmatic formations (Tindouf Basin, Southwest Algeria)

The EGU General Assembly (2015)

Mejda Amira Boussada Nacer-Eddine Merabet Yamina Mahdjoub Saïd Maouche Moulay Charaf Chabou

Recent geochemical analyses and 40Ar/39Ar dating of dolerite sills and dykes and basalt lava flows in southwestern Algeria (Tindouf, Reggane, Bechar area and Hank basins) showed that these rocks are linked to the Central Atlantic Magmatic Province (CAMP). The later is one of the largest identified Mesozoic basalt provinces formed approximately 200 Ma ago as a preamble to the Pangea dismemberment. These data were strong arguments to undertake geological field observations and a sampling for paleomagnetic and magnetic fabric study in CAMP province formations. Three long doleritic dykes (198.9 1.8 Ma) in the Tindouf basin were targeted in order to point out the structural context of their emplacement (magnetic fabric) and to determine a new reliable Mesozoic pole. The magnetic fabric, in almost the whole sampled sections, is defined mainly by clustering of k1 and k2 axes on the dyke plane whereas the k3 axis is nearly perpendicular to it. This fabric is therefore interpreted as due to magma flow. The new Jurassic paleomagnetic pole, of excellent quality, is very close to those obtained from coeval detrital Algerian Saharan formations and also close to those recently determined from coeval Morrocan igneous formations. It is very close to the 200 Ma mean NW African pole too. These results represent a considerable contribution of to a better knowledge of the geodynamical context during this period.

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