Treballs Finals de Grau (TFG) - Geologia

URI permanent per a aquesta col·leccióhttps://hdl.handle.net/2445/125042

Treballs Finals del Grau de Geologia de la Facultat de Geologia de la Universitat de Barcelona.

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    Caracterització de les mineralitzacions polimetàl·liques de la zona de Villamanín (León)
    (2017-06) Garcia Badal, Miquel; Campeny, Marc; Torró i Abat, Lisard
    [eng] In this work are presented the results of the geological study focused on the mineralizations of La Profunda and La Divina Providencia mines, located in the vicinities of Villamanín (Castilla y León, Spain). The main objective of this work is to carry out a mineralogical, textural and geochemical characterization of these mineralizations. In addition, is also studied the distribution of metals in villamaninite (Cu,Ni,Co,Fe)S2 in order to define their formational and alteration processes. At last, we would like to present a revision of the ore deposits typological definition. During the fieldwork were obtained a set of 33 samples and we carried out 20 corresponding thin sections. To study them have been used different analytical techniques such as optic microscopy, scanning electron microscopy, electron microprobe and Raman spectroscopy. The petrographic and geochemical studies suggest that the mineralizations, those are hosted in bituminous limestones, were formed from the circulation of hydrothermal fluids associated to redox processes. Nowadays they are significantly affected by a secondary oxidation and supergenic alteration. These are polymetallic mineralizations mainly composed by Cu, Ni, Co, Fe and minor U, As, Hg, Sb and Bi. It has been determined a very variable composition of villamaninite (Cu,Ni,Co,Fe)S2, which is a common sulphide in the La Divina Providencia mine. We suggest to include Se as a structural element of this mineral (Cu,Ni,Co,Fe)(S,Se)2, which can be remobilized during the alteration process forming secondary mineral phases. At the end, we proposed a revision of the typological definition of La Profunda and La Divina Providencia mineralizations, suggesting that they would be related with Carlin-type deposits.