@article{MAKHILLOJES20104225413,
    title = {Geochemical and Tectonic Significance of the Calc-Alkaline Cryogenian Mafic Rocks of the Igherm Inlier (Western Anti-Atlas, Morocco)},
    journal = {Online Journal of Earth Sciences},
    volume = {4},
    number = {2},
    pages = {80-88},
    year = {2010},
    issn = {1991-7708},
    doi = {ojesci.2010.80.88},
    url = {https://makhillpublications.co/view-article.php?issn=1991-7708&doi=ojesci.2010.80.88},
    author = {El Hassan El,Hassan and},
    keywords = {Western Anti-Atlas,igherm,Calc-alkaline mafic rocks,lower cryogenian,paleoproterozoic subduction,Morocco},
    abstract = {In the Igherm inlier (Western Anti-Atlas, Morocco) dolerilic dyke swarms with various directions and gabbroic, intrusive bodies were emplaced during Neoproterosoic times, cutting across either Eburnean micaschists and granites or panafrican limestones and quartzites. The mafic rocks of the lower Cryogenian magmatism from the Igherm inlier (Moroccan Western Anti-Atlas) have calc-alkaline, tholeiitic and alkaline affinities. The calc-alkaline dolerite dykes and gabbros bodies emplaced before the conglomeratic formations of the upper Cryogenian and after the tholeiitic mafic rocks that characterize the pre-Pan-African rifting are similar to rocks from orogenic setting. They are characterized by high LILE, Th, Ce, P, Sm contents and La/Nb ratio and a low HFSE content with negative anomalies in Nb, Zr and Ti. The geodynamic environment of the sedimentary country rocks corresponds to that of a passive margin in a distensive tectonic context. The calc-alkaline affinity of these magmas can be attributed to the influence of a Paleoproterozoic subduction zone that contributed to the enrichment of the subcontinental mantle. During the extensional event of the Pan-African orogenesis, the mantle would have produced tholeiitic, alkaline and/or transitional magmas before melting (caused by adiabatic decompression) reached the enriched subcontinental mantle previously enriched during the Eburnean subduction where it would have generated calc-alkaline magmas.}
    }