Person:
Lunar Hernández, María Del Rosario

Profile Picture
First Name
María Del Rosario
Last Name
Lunar Hernández
URI
https://hdl.handle.net/20.500.14352/75241
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Mineralogía y Petrología
Area
Cristalografía y Mineralogía
Identifiers
UCM identifierORCIDScopus Author IDDialnet IDGoogle Scholar ID

Filters

20112
Reset filters

Settings

Author: Gervilla, Fernando × Has files: true ×

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    The role of crustal contamination in the genesis of Ni-Cu sulfide ores from the Cortegana Igneous Complex (SW Spain)
    (Let's Talk Ore Deposits: Proceedings of the Eleventh Biennial SGA Meeting, Antofagasta, Chile, 26-29 September 2011, 2011) Piña García, Rubén; Gervilla, Fernando; Ortega Menor, Lorena; Lunar Hernández, María Del Rosario
    Crustal contamination of mafic magmas with S-rich country rocks is believed to play a critical role in the formation of Ni-Cu sulfide ores in SW Spain. Whereas this process has been well recognized in the Aguablanca Ni-Cu deposit (the only economic ore of this type in SW Europe), no data existed in other less mineralized, mafic-ultramafic intrusions of the region, such as the Tejadillas prospect in the Cortegana Igneous Complex. The Tejadillas prospect is composed of igneous cumulates similar to those of Aguablanca, but their incompatible trace element abundances show more primitive patterns than those of Aguablanca. In contrast, incompatible trace element ratios of the Aguablanca rocks are much closer to the contaminant country rocks than those of Tejadillas. Therefore, we suggest that the small volume of sulfide mineralization observed at Tejadillas was the consequence of low degrees of contamination of its parental magma by S-rich country rocks. This suggest that assimilation of S-rich country rocks by mafic magmas is the key factor for the genesis of economic Ni-Cu sulfide ores in SW Spain.
  • Thumbnail Image
    Item
    Podiform chromitites from the Calzadilla de los Barros serpentinite, Iberian Massif, SW Spain
    (2011) Lunar Hernández, María Del Rosario; Ortega Menor, Lorena; Piña García, Rubén; Gervilla, Fernando; Monterrubio, Serafín; Merinero, Raúl
    Podiform chromitites occur as in situ and removed bodies in the Calzadilla de los Barros Serpentinite (Iberian Massif, SW Spain), a set of ultramafic massifs made up of partly serpentinized harzburgite with minor dunite and gabbros. They consist of massive to semi-massive chromitites, frequently with nodular texture. Chromite chemistry is characterized by high Al2O3 contents and up to 0.4 wt.% TiO2, in agreement with a MORB affinity of the parental melt. Platinum-group element abundances are similar to most Al-chromitites reported in the literature except for an unusual enrichment in Pt and Pd. High Pt and Pd values were probably caused by late metamorphic alteration.