Clinopyroxene trace element compositions of cumulate mafic rocks and basalts from the Hercynian Moroccan Central Meseta

Petrogenetic implications

Y. Driouch*, D. Béziat, M. Grégoire, F. Laguenini, M. Ben Abbou, A. Ntarmouchant, M. Roddaz, M. Dahire, A. Bennouna, M. Belkasmi, S. Brusset, P. Debat

*Corresponding author for this work

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

In the Fourhal foreland basin, in the north-eastern part of the Marrocan Central Meseta, mafic series are represented by basalts interbedded with Early Namurian turbidites and by numerous mafic sills, including the Marziqallal sill detailed here. The study of the trace element compositions of the clinopyroxenes, a ubiquitous mineral in the gabbroic sill and basalts, indicate that these two formations are derived from a similar parental magma. This magma evolved following a general fractional crystallization process involving the cumulation of clinopyroxene, then of ilmenite, occurring within the sill and having a leading role in the composition of the associated basalts. Calculated parental melts inferred from clinopyroxene analyses from the various cumulative units of the sill have trace element patterns similar to the one found for the basaltic flows. These patterns are compatible with magma and clinopyroxene compositions from a subduction-related geotectonic setting.

Original languageEnglish
Pages (from-to)97-106
Number of pages10
JournalJournal of African Earth Sciences
Volume56
Issue number2-3
DOIs
Publication statusPublished - Feb 2010
Externally publishedYes

Keywords

  • Basalt
  • Central Meseta
  • Clinopyroxene
  • LA-ICP-MS
  • Mafic cumulates
  • Trace elements

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