PhD defense – Héctor Ricardo CAMPOS RODRIGUEZ

Mafic magmatism and metasediments in the Central Iberian Zone, Spain: Towards a better understanding of the sources and mechanisms of Sb mineralization?

Monday, Dec. 16
14:30
Amphi. OSUC
Lien Zoom

Abstract

This thesis aims to enhance the targeting of Sb deposits by offering novel insights into their potential sources in the Central Iberian Zone (CIZ), Spain. Two main potential sources and mechanisms may be associated with the formation of Sb deposits in the CIZ, including (i) magmatic degassing of mafic intrusions and (ii) devolatilization of Sb-rich metasedimentary sequences. (i) Sb deposits in the CIZ exhibit a spatial association with mafic rocks, which are synchronous with mafic intrusions and Sb deposits in the Armorican Massif in France. The presence of primary fluid inclusions in ilmenites, containing Sb, Cu, Sn, Mo, W and Pb, would suggest the existence of a metal- and metalloid-enriched fluid phase in the mafic magma during ilmenite crystallization. (ii) Alternatively, whole rock geochemical data revealed Sb enrichment in metasedimentary rocks, suggesting that Sb may have been mobilized in the contact aureoles adjacent to the mafic sills during thermal devolatilization.

Further studies are required to quantify the contribution of these two sources to the formation of Sb deposits in the CIZ.

Keywords : Antimony, sources, mafic magmatism, metasediments, Variscan belt.