RT Journal Article
T1 A new style of Ni-Cu mineralization related to magmatic breccia pipesin a transpressional magmatic arc, Aguablanca, Spain
A1 Tornos Arroyo, Fernando
A1 Casquet, César
A1 Galindo Francisco, Mª del Carmen
A1 Velasco Roldán, Francisco
A1 Canales Gallarosa, Ángel
AB 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
PB Springer Science Business Media
SN 0026-4598
YR 2001
FD 2001
LK https://hdl.handle.net/20.500.14352/56972
UL https://hdl.handle.net/20.500.14352/56972
LA eng
DS Docta Complutense
RD 9 may 2024