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<p>The Moroccan Carboniferous orogenic formations are marked by numerous magmatic bodies associated with the evolution of the Variscan belt. Mafic rocks are interbedded within the Upper Visean detrital sediments, while granitoid bodies are late- to post-orogenic. The Khouribga–Oulmes structural unit, in the NE part of the Moroccan Central Hercynian Massif, features mafic rock series emplaced as layered sills and associated basaltic flows comparable to those of the Fourhal basin. This study focuses on the recently discovered Boucharmit sill, mainly composed of gabbros showing mineralogical and textural variations defining phase, size, or modal igneous layering. The petrographic study defines six gabbroic cumulate units dominated by plagioclase and clinopyroxene, with subordinate olivine, amphibole, and ilmenite. The study combines petrographic, mineralogical, and geochemical analyses with LA-ICP-MS trace element data on clinopyroxenes to constrain parental magma composition using appropriate partition coefficients. Main results include: six gabbroic units with olivine-bearing lenses at the bottom and pegmatitoid at the top; fractional crystallization following the olivine-plagioclase-clinopyroxene-amphibole-ilmenite sequence; late magmatism probably linked to hydrothermal fluids forming Ti–rich brown amphibole and ilmenite; cumulates geochemistry showing large element dispersion due to modal variations, not representing equilibrium melts; parental melts derived from a mantle source equilibrated in the spinel stability field; geochemical signatures indicating arc-related tectonic setting. These results are in agreement with models considering the Carboniferous basins at the NE of Moroccan Hercynian Central Massif as compressional foreland basins.</p>

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Petrogenesis and geodynamic inferences from the Boucharmit sill: a new occurrence of Carboniferous mafic rocks in the Khouribga–Oulmes structural domain, NE of the Moroccan central Hercynian Massif

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Fouzia Laguenini,
  • Youssef Driouch,
  • Mohamed Ben Abbou,
  • Mustapha Elabouyi,
  • Meryem Redouane,
  • Ahmed Ntarmouchant,
  • Brahim Mali,
  • Brahim Boudad,
  • El Mahjoub Mahjoubi,
  • Mohamed Dahire,
  • Mohamed Belkasmi

摘要

The Moroccan Carboniferous orogenic formations are marked by numerous magmatic bodies associated with the evolution of the Variscan belt. Mafic rocks are interbedded within the Upper Visean detrital sediments, while granitoid bodies are late- to post-orogenic. The Khouribga–Oulmes structural unit, in the NE part of the Moroccan Central Hercynian Massif, features mafic rock series emplaced as layered sills and associated basaltic flows comparable to those of the Fourhal basin. This study focuses on the recently discovered Boucharmit sill, mainly composed of gabbros showing mineralogical and textural variations defining phase, size, or modal igneous layering. The petrographic study defines six gabbroic cumulate units dominated by plagioclase and clinopyroxene, with subordinate olivine, amphibole, and ilmenite. The study combines petrographic, mineralogical, and geochemical analyses with LA-ICP-MS trace element data on clinopyroxenes to constrain parental magma composition using appropriate partition coefficients. Main results include: six gabbroic units with olivine-bearing lenses at the bottom and pegmatitoid at the top; fractional crystallization following the olivine-plagioclase-clinopyroxene-amphibole-ilmenite sequence; late magmatism probably linked to hydrothermal fluids forming Ti–rich brown amphibole and ilmenite; cumulates geochemistry showing large element dispersion due to modal variations, not representing equilibrium melts; parental melts derived from a mantle source equilibrated in the spinel stability field; geochemical signatures indicating arc-related tectonic setting. These results are in agreement with models considering the Carboniferous basins at the NE of Moroccan Hercynian Central Massif as compressional foreland basins.