RT Journal Article
T1 The Aguablanca Cu–Ni ore deposit (Extremadura, Spain), a caseof synorogenic orthomagmatic mineralization: age and isotopecomposition of magmas (Sr, Nd) and ore (S)
A1 Casquet, César
A1 Galindo Francisco, Mª del Carmen
A1 Tornos Arroyo, Fernando
A1 Velasco Roldán, Francisco
A1 Canales Gallarosa, Ángel
AB 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, islocated 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 hostigneous 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 immisciblesulphide-magma formation. Intrusion took place at the beginning of the type-A oblique subduction of the South PortugueseZone under the Ossa-Morena Zone and was probably driven by transpressive structures (strike-slip faults). The mineralizationis thus synorogenic.Aguablanca is probably the first case referred to in the literature of a magmatic Cu–Ni ore deposit hosted by calc-alkalineigneous rocks.
PB Elsevier Science B.V., Amsterdam
SN 0169-1368
YR 2001
FD 2001
LK https://hdl.handle.net/20.500.14352/56996
UL https://hdl.handle.net/20.500.14352/56996
LA eng
DS Docta Complutense
RD 29 abr 2024