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A major element, PGE and Re-Os isotope study of Middle Atlas (Morocco) peridotite xenoliths : evidence for coupled introduction of metasomatic sulphides and clinopyroxene

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A major element, PGE and Re–Os isotope study of Middle Atlas (Morocco) peridotite xenoliths: Evidence for coupled introduction of metasomatic sulphides and clinopyroxene st ion of metasomatic sulphides Nadine Wittig a,⁎, D. Graham Pear a Department of Earth Sciences, Durham University, South b School of Geography, Environment and Earth Sciences, V c Leibniz Institute of Marine Sciences, Kiel University, Wis d A.P. Møller Skolen—Upper Secondary School and Sixth F a r t i c l e i n f o Article history: Received 9 March 2009 Accepted 2 November 2009 Available online xxxx but, together with Re abundances, also exhibit a good correlation with Al2O3, MgO and Cu. Lithos xxx (2009) xxx–xxx LITHOS-02148; No of Pages 12 Contents lists available at ScienceDirect Lith .e l ARTICLE IN PRESS The major element, I-PGE and Os isotope correlations suggest that the initial melt depletion led to the exhaustion of sulphide and clinopyroxene (20 to 30%) without significant stabilization of I-PGE-rich alloys. During later modal metasomatism of the refractory Middle Atlas continental mantle root with silicate melts akin to MORB or OIB the introduction of clinopyroxene/amphibole reduced the volume of the melt inducing sulphur saturation in these melts causing precipitation of secondary sulphides. This coupled crystallization of pyroxenes and sulphides (chalcopyrite) resulted in the two-component mixing systematics exhibited by I- PGEs, Os isotopes with major elements and Cu preserved in the Middle Atlas continental mantle root. © 2009 Elsevier B.V. All rights reserved. 1. Introduction Surprisingly little is known about the formation of the continental sediments. Geophysical examination associated with the exploration of these marine sediment deposits has revealed the Middle Atlas Mountain range as an inverted rift system (Beauchamp et al., 1996; crust and its supporting mantle root in the At (Fig. 1) although the lithospheric evolution is due to suspected petroleum deposits in ⁎ C

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