%0 Journal Article
%A Tornos Arroyo, Fernando
%A Casquet, César
%A Galindo Francisco, Mª del Carmen
%A Velasco Roldán, Francisco
%A Canales Gallarosa, Ángel
%T A new style of Ni-Cu mineralization related to magmatic breccia pipesin a transpressional magmatic arc, Aguablanca, Spain
%D 2001
%@ 0026-4598
%U https://hdl.handle.net/20.500.14352/56972
%X The Aguablanca deposit represents a new style ofmagmatic Ni Cu mineralization in discordant sulfide rich pyroxenitic breccia pipes. The orebody is hosted by Variscan calcalkaline diorites and gabbros which intruded during an obliquesubduction/collision event. Transpressional transtensionalleft lateral structures facilitated the intrusion of primitive magmasto shallow depths in the crust. A two stage genetic model isproposed. In the first stage, a transitional deep magma chamberformed. The primitive magma interacted at depth with wall rocks,resulting in extensive crustal contamination, concomitant sulfidemagma immiscibility and settling of orthopyroxene , clinopyroxene and sulfide rich cumulates to form a layered magmaticcomplex. Geochemical and mineralogical evidence, including thevirtual disappearance of olivine, heavy 34S values (7.4‰),distinctive Nd, Sr and Pb signatures, high Au contents, and thepresence of spinel and graphite indicate a major interaction withthe upper crust, probably with pyrite rich carbonaceous slates ofLate Proterozoic age. The second stage was related with theemplacement of residual calc alkaline gabbroic to noritic meltsand the development of an intrusive breccia containing fragmentsof the consolidated layered complex rocks and associateddisseminated to massive sulfides
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