Nacer-Eddine Merabet

Centre de Recherche en Astronomie Astrophysique et Géophysique

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Saïd Maouche

Centre de Recherche en Astronomie Astrophysique et Géophysique

Yamina Mahdjoub

University of Sciences and Technology Houari Boumediene

Abdeslam Abtout

Centre de Recherche en Astronomie Astrophysique et Géophysique

Tahar Aı̈fa

Géosciences Rennes

Mohamed Ayache

Laboratoire des Sciences du Climat et de l'Environnement

Atmane Lamali

Centre de Recherche en Astronomie Astrophysique et Géophysique

Bernard Henry

University of Benin

Mohamed Kahoui

University of Sciences and Technology Houari Boumediene

Mejda Amira Boussada

Centre de Recherche en Astronomie Astrophysique et Géophysique

Abdelmadjid Nadjemi

Université Djilali Bounaama Khemis Miliana

Cooperative Institutions

Centre de Recherche en Astronomie Astrophysique et Géophysique

Centre National de la Recherche Scientifique

University of Sciences and Technology Houari Boumediene

Université Djilali Bounaama Khemis Miliana

École Normale Supérieure de Bouzareah Alger

Centre de Recherche Nucléaire d’Alger

University of Abou Bekr Belkaïd

Institut de physique du globe de Paris

Laboratoire de Géographie Physique

Université Paris Cité

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Paleoproterozoic structural frame of the Yetti domain (Eglab shield, Algeria): Emplacement conditions of the Tinguicht late pluton from magnetic fabric study

Journal of African Earth Sciences (2015)

Nacer-Eddine Merabet Yamina Mahdjoub Bernard Henry Abdeslam Abtout Saïd Maouche

10.1016/j.jafrearsci.2015.11.018

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Citations (6)

The Paleoproterozoic Djebel Drissa ring complex (Eglab shield, Algeria): Post-collisional intrusions in a transtentional tectonic setting

Tectonophysics (2014)

Nacer-Eddine Merabet Yamina Mahdjoub Abdeslam Abtout Bernard Henry Mohamed Kahoui

Echelon formation

10.1016/j.tecto.2014.01.005

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New Lower Stephanian palaeomagnetic pole for the Saharan craton (Merkala formation, Tindouf basin, Algeria)

Comptes Rendus De L Academie Des Sciences Serie Ii Fascicule A-sciences De La Terre Et Des Planetes (1999)

Bernard Henry Nacer-Eddine Merabet Hamza Bouabdallah Saïd Maouche

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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.

Sill

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Paleomagnetic and magnetostructural study of Jurassic formations of Gara Djebilet (Tindouf Basin, Southwestern Algeria)

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

Recent geochemical analyzes and 40Ar/39Ar datings of dolerite sills and dykes and basaltic lava flows from Southwestern Algeria (Tindouf, Reggane, Bechar and Hank basins) have shown that these rocks are related to the Central Atlantic Magmatic Province (CAMP). The CAMP is one of the largest among the Mesozoic basaltic provinces identified and formed about 200 Ma ago as a preamble to the breakup of Pangea. These data were solid arguments for undertaking geological observations and sampling for paleomagnetic studies and magnetic fabrics on the CAMP formations. A network of three long doleritic dykes (198.9 ± 1.8 Ma) located in the Tindouf Basin were targeted to clarify the structural context of their emplacement (magnetic fabrics) and to determine a new reliable Mesozoic pole. The magnetic fabric, in almost all the sections sampled, is defined mainly through grouping of k1 and k2 axes on the dyke plane whereas axis k3 is almost perpendicular to the dyke plane. This fabric can therefore be interpreted as the magma flow direction. The new Jurassic paleomagnetic pole, of excellent quality, is very close to those obtained on detrital formations of the Algerian Sahara and close to those recently determined on igneous formations of Morocco. This new pole is also very close to the North African pole at 200 Ma. These results represent a new contribution for a better knowledge of the geodynamic context during this period.

Sill

Dike

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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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Citations (1)

The Eburnean granitic Djebel Drissa ring complex (Eglab shield, Algeria): post-collisional intrusions in a transtentional tectonic setting

EGU General Assembly Conference Abstracts (2013)

Nacer-Eddine Merabet Yamina Mahdjoub Abdeslam Abtout Bernard Henry Mohamed Kahoui

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Rock magnetic study on the Yetti–Eglab Intrusions, Sahara: contribution to the West African Craton geology

Geological Society London Special Publications (2020)

Tahar Aı̈fa Nacer-Eddine Merabet

Abstract New palaeopoles have been calculated for the West African Craton (WAC) using palaeomagnetic data obtained on 178 cores of the Yetti–Eglab intrusions and stromatolite-bearing formation. One, two or three components of magnetization on 172 (14 sites) and 37 (6 sites) oriented specimens or cores were isolated mainly on doleritic dykes. High and low unblocking temperature components were evidenced in the dykes but also at four sites of the well-dated Hank stromatolite-bearing formation (875–890 Ma). Rock magnetic analyses show stable remanent magnetizations mainly carried by magnetite (or titanomagnetite) but may also reveal the presence of hematite, pyrrhotite and goethite. Regarding the recently constructed apparent polar wander path of the WAC until 500 Ma, these newly computed remanent components seem to be mainly older, some of which could be remagnetizations at different periods. However, according to geological dating and literature, the Yetti and Eglab terranes belonging to the WAC were amalgamated around 1.9 Ga and involved in the formation of the Columbia Supercontinent. The palaeopole computed for the stromatolite-bearing formation corresponds with the location of Rodinia Supercontinent at its early stages of amalgamation. The geodynamic evolution of the WAC with respect to both supercontinents suggests that the Eglab and Yetti could be separated by oceanic crust before 1.9 Ga. A volcanic arc developed during the subduction of this ocean followed by crustal thickening that generated an intrusive suite (Aftout granites) when it was at low northern latitudes. Baltica and Rio de la Plata cratons were close to the WAC after 1.7 Ga, following a nearly similar path between 1.7 and 0.9 Ga. In Africa, the collapse of the Birimian orogen was probably contemporaneous with the fragmentation of Columbia. At 0.9 Ga, Baltica was probably not attached to the WAC since the latter was not affected by the later Grenvillian orogen.

10.1144/sp502-2019-198

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Gamma-ray spectrometry observations to monitor a presumed meteoritic signature at Maâdna crater (Talemzane, Algeria)

Atmane Lamali Lamine Hamai Sid Ahmed Mokhtar Abdelkrim Yelles‐Chaouche Abdeslam Abtout

<p>By measuring changes in radioelement concentrations, gamma-ray spectrometry is increasingly emerging as an efficient geophysical method that allows such changes to be geologically mapped according to lithology and soil type. At Ma&#226;dna crater in southern Algeria, this method has been used to monitor any changes in the composition of the target rocks that may be associated with the impact cratering process. For this purpose, several measurements were carried out in situ using a portable field gamma spectrometer. As a result, most predominantly calcareous surface lithologies, exposed on the rim and flanks of the crater, showed a very low emitted radiometric response over the three channels (K, Th, U). However, no more than 90 Cps were counted both inside and outside the crater. Such a rate is indeed expected in sedimentary rocks with low clay content, and this remains valid, as long as other exogenous mineralogical enrichments are excluded. On the other hand, the contoured radioelement concentrations maps, have demonstrated an anomalous enhanced gamma radiation levels of potassium-dominated peaks over the central part of the crater and in the surrounding wadis. Nevertheless, the central potassium anomaly is well correlated with the shallower magnetic one that has been described in previous studies (see e.g. Lamali et al., 2016). Therefore, either near the surrounding wadis or in the central part of this crater, this anomalously high level of radioactivity may be linked to an accumulation of later altered deposits. Consequently, there are no objective criteria to link these results to an impact event occurring at the Ma&#226;dna structure, similar to what was done at the Serra da Cangalha crater (Vasconcelos et al., 2012).</p>

Lithology

Radiometric dating

10.5194/egusphere-egu2020-2677

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Tectonic and Hydrothermal Activities in Debagh, Guelma Basin (Algeria)

Journal of Geological Research (2013)

Saïd Maouche Abdeslam Abtout Nacer-Eddine Merabet Tahar Aı̈fa Atmane Lamali

Quaternary and Pliocene travertines, deposited from hot springs, can reveal much about neotectonic and hydrothermal activity. The aim of this work is the understanding of the actual tectonic activity in the Guelma Basin and in one of its spa structures. Gravity data were collected during a field study in the Hammam Debagh (HD) area and then analyzed to better highlight the architecture of its subsurface underlying structures. This analysis was performed by means of a Bouguer anomaly, upward continuations, and residual and derivative maps. Comparison of gravity maps, field geology, geomorphic observations, and structural maps allowed us to identify the major structural features in the Hammam Debagh. As a result, we confirm the position of the Hammam Debagh active fault which is superimposed to the hydrothermal active source in the NW-SE direction characterized by a negative gravity anomaly.

Anomaly (physics)

Neotectonics

10.1155/2013/409475

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Citations (26)