2026-06-27T10:30:04Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/569962024-07-19T16:48:31Zcom_20.500.14352_14col_20.500.14352_15

Casquet Martín, César Galindo Francisco, María Del Carmen Tornos Arroyo, Fernando Velasco Roldán, Francisco Canales Gallarosa, Ángel 2023-06-20T16:47:15Z 2023-06-20T16:47:15Z 2001 0169-1368 PII: S0169-1368Ž01.00033-6 https://hdl.handle.net/20.500.14352/56996 http://www.elsevier.com/locate/oregeorev 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. eng open access 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) journal article