Pétrologie de l'intrusion alcaline mésozoïque de la région d'Anemzi, Haut Atlas Central, Maroc

The Atlas System

“…The reader will find detailed accounts of these studies in Bertrand et al (1982), Bertrand (1991), Sebai et al (1991), Ouarhache et al (2000), Lachkar et al (2000), Youbi et al (2003), Knight et al (2004), Marzoli et al (2004), Verati et al (2007), Mahmoudi & Bertrand (2007) and references therein. Post-Liassic magmatic rocks have been comparatively less studied (Hailwood & Mitchell, 1971;Harmand & Laville, 1983;Beraâouz et al, 1994;Amrhar et al, 1997;Lhachmi et al, 2001;Zayane et al, 2002;Charrière et al, 2005).…”

“…The latter group usually derives from the former through low-pressure fractional crystallisation coupled with assimilation of continental crust, and sometimes with magma mixing processes. Their magmatic signatures range from transitional basalt series rather similar to the Afar series (Zayane et al, 2002) to weakly/moderately alkaline series (Beraâouz et al, 1994;Lhachmi et al, 2001). The moderate enrichment in incompatible elements of these magmatic rocks, and the numerous evidences for crustal contamination that they display are typical of continental intraplate magmatism, often described in graben-and rift-related magmatic series.…”

Organic inclusions evidence, composition, and cathodoluminescence behaviour for the formation conditions of fluorapatite from Anemzi (Morocco)

“…The Central High Atlas corresponds to the deepest part of the former Atlas basin, underlain by a necked continental crust . It is characterized by alkaline‐transitional gabbroic magmatism emplaced in the form of sills, dykes, and outpours . This event occurred shortly after the Bathonian emersion of the Atlas domain, during the Late Dogger and Late Jurassic Periods, although the latest basalts emplaced during the Barremian are coeval with the youngest red beds .…”

“…Syenites, which make up 10–20% of the total volume of the intrusion, systematically crop out at the highest levels of the intrusion. They are characterized by a pinkish colour and form oviform bodies or centimetric veinlets cross‐cutting both the gabbro and the monzodiorite . Green apatite crystals are hosted in nepheline syenites in close paragenesis with feldspars, carbonates, and haematite.…”

“…Green apatite crystals are hosted in nepheline syenites in close paragenesis with feldspars, carbonates, and haematite. The alkaline rocks intruded into mid‐Jurassic limestones …”