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The Aguablanca Cu–Ni ore deposit (Extremadura, Spain), a case of synorogenic orthomagmatic mineralization: age and isotope composition of magmas (Sr, Nd) and ore (S)

Impacto



Casquet, César y Galindo Francisco, Mª del Carmen y Tornos Arroyo, Fernando y Velasco Roldán, Francisco y Canales Gallarosa, Ángel (2001) The Aguablanca Cu–Ni ore deposit (Extremadura, Spain), a case of synorogenic orthomagmatic mineralization: age and isotope composition of magmas (Sr, Nd) and ore (S). Ore geology reviews, 18 . pp. 237-250. ISSN 0169-1368

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Resumen

The Aguablanca Cu–Ni orthomagmatic ore deposit is hosted by mafic and ultramafic rocks of the Aguablanca stock,
which is part of the larger, high-K calc-alkaline Santa Olalla plutonic complex. This intrusive complex, ca. 338 Ma in age, is
located in the Ossa-Morena Zone (OMZ) of the Iberian Variscan Belt. Mineralization consists mainly of pyrrhotite,
pentlandite and chalcopyrite resulting from the crystallization of an immiscible sulphide-rich liquid. Isotope work on the host
igneous rocks (Sr, Nd) and the ore (S) suggests that contamination with an upper-crustal component took place at some depth before final emplacement of the plutons (εNd338= -6 to -7.5; Sr(338)=0.7082 to 0.7100; δ34(sulphides) near + 7.4‰). Assimilation–fractional crystallization (AFC) processes are invoked to explain early cumulates and immiscible
sulphide-magma formation. Intrusion took place at the beginning of the type-A oblique subduction of the South Portuguese
Zone under the Ossa-Morena Zone and was probably driven by transpressive structures (strike-slip faults). The mineralization
is thus synorogenic.
Aguablanca is probably the first case referred to in the literature of a magmatic Cu–Ni ore deposit hosted by calc-alkaline
igneous rocks.


Tipo de documento:Artículo
Palabras clave:Cu–Ni ores; Calc-alkaline magmatism; Isotope geochemistry; Variscan orogeny; Spain
Materias:Ciencias > Geología > Petrología
Código ID:12147
Depositado:02 Feb 2011 13:09
Última Modificación:02 Feb 2011 13:09

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