Abdelmadjid Nadjemi

Université Djilali Bounaama Khemis Miliana

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Abdeslam Abtout

Centre de Recherche en Astronomie Astrophysique et Géophysique

Abdelkrim Yelles‐Chaouche

Centre de Recherche en Astronomie Astrophysique et Géophysique

Sid Ahmed Mokhtar

Centre de Recherche Nucléaire d’Alger

Nacer-Eddine Merabet

Centre de Recherche en Astronomie Astrophysique et Géophysique

Lamine Hamai

Centre de Recherche en Astronomie Astrophysique et Géophysique

Atmane Lamali

Centre de Recherche en Astronomie Astrophysique et Géophysique

Leila Djadia

Centre de Recherche en Astronomie Astrophysique et Géophysique

Salah-Eddine Bentridi

Université Djilali Bounaama Khemis Miliana

Salah Eddine Bentridi

Université Djilali Bounaama Khemis Miliana

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Centre de Recherche en Astronomie Astrophysique et Géophysique

Université Djilali Bounaama Khemis Miliana

Centre National de la Recherche Scientifique

University of Sciences and Technology Houari Boumediene

University of Abou Bekr Belkaïd

École Normale Supérieure de Bouzareah Alger

Laboratoire d’HYdrologie et de GEochimie

Centre de Recherche Nucléaire d’Alger

Géoazur

Institut de Recherche pour le Développement

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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>

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Radiometric dating

10.5194/egusphere-egu2020-2677

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Exploration of the hypothetical impact ejecta layer around the Maâdna structure (Talemzane, Algeria) using georadar technique

Journal of African Earth Sciences (2020)

Atmane Lamali Lamine Hamai Abdelmadjid Nadjemi Abdelkrim Yelles‐Chaouche Abdeslam Abtout

Ground-Penetrating Radar

10.1016/j.jafrearsci.2020.103975

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Citations (3)