By Prof. Nasrrddine Youbi
Department of Geology, Cadi Ayyad University – Morocco
Faculty of Geology and Geography, Tomsk State University – Russia
|GSAf seminar series
Date: 25 June 2021
15:00 Nigeria time, 16:00 South Africa time
Online Seminar (Google Meet)
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|Prof. Dr Nasrrddine is a Full Professor at the Geology Department of Faculty of Sciences-Semlalia of Cadi Ayyad University, Marrakesh since 1987 where he obtained his PhD thesis in Volcanology-Geochemistry in 1998. He is currently Director of the Laboratory “Dynamics of the Lithosphere and the Genesis of Mineral Resources» (DLGR) where he develops with his Colleagues and PhD students research in volcanology, petrology and geochronology. His research focuses mainly on the large igneous provinces (“LIPs”). He is the author of a hundred publications indexed on the ISI bibliographic database, including 3 articles published in 2017 and 2020 in the prestigious scientific journal Nature. In 2019, he was awarded by the Prize for Excellence in Geoscience Research, a prize awarded to the best Moroccan researchers who were distinguished by the quality, volume and number of citation of their scientific production, listed by the Publisher Clarivate Analytics (Web of Science Group), during the last 5 years (2014-2018). This award was given by His Excellency the Minister of Education and Scientific Research, Prof. Dr Saïd AMZAZI and during the “Research Excellence Day” held at the CNRST headquarters in Rabat on July 03, 2019.
||State of knowledge of the Central Atlantic Magmatic Province (CAMP) Large Igneous Province (LIP)
The CAMP LIP was emplaced at ca. 201 Ma, close to the Triassic-Jurassic boundary, during the early stages of the break up of the supercontinent of Pangaea that led to the opening of the Central Atlantic Ocean. CAMP magmatism is nowadays represented by remnants of intrusive (crustal underplates, layered intrusions, sills, dykes) and extrusive (pyroclastic sequences and lava flows) rocks that occur in once-contiguous parts of northwestern Africa, southwestern Europe, and North and South America. It may have covered over 7 x 106 km2, with a total volume of magma estimated at 2-4×106 km3 and was active for no more than 4-5 Ma. Most of the CAMP rocks are tholeiitic low-Ti Continental Flood Basalts (CFBs), whereas high Ti CFBs are restricted to a narrow zone in the southern margin of the WAC (Liberia, Sierra Leone) and north-eastern South America (Surinam, French Guyana and northern Brazil). However, the geographic boundaries of the CAMP remain uncertain, especially in Africa and South America. Recent investigation suggests that the CAMP was emplaced as far as the sub-Andean area in southern Bolivia, about 3000 km from the Atlantic margin and indicates that the extension of the CAMP magmatism is probably much larger than previously recognized. The CAMP is considered as the result of a mantle super-plume or, alternatively, as a consequence of lithosphere extension and thinning, pre-dating the Atlantic opening, that triggered decompressional melting in the upper asthenosphere. Magmatism is apparently coeval with the mass extinction at the Triassic-Jurassic boundary. In this talk we describe the main volcanologic, geochemical, and geochronologic aspects of the Central Atlantic Magmatic Province (CAMP).