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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)

Casquet, César and Galindo Francisco, Mª del Carmen and Tornos Arroyo, Fernando and Velasco Roldán, Francisco and 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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Abstract

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.


Item Type:Article
Uncontrolled Keywords:Cu–Ni ores; Calc-alkaline magmatism; Isotope geochemistry; Variscan orogeny; Spain
Subjects:Sciences > Geology > Petrology
ID Code:12147
Deposited On:02 Feb 2011 13:09
Last Modified:02 Feb 2011 13:09

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