Mineralogical and compositional evidence of a district scale Sn-W skarn system in SW Sardinia: a review.
Matteo L. Deidda
;Alfredo Idini;Dario Fancello;Giovanni De Giudici;Stefano Naitza
2023-01-01
Abstract
We studied three representative skarn orebodies of SW Sardinia (Perda Niedda, Monte Tamara and Rosas), related to ilmenite-series ferroan granites to assess their Sn-W and other Critical Raw Materials (CRM) metallogenic potential. The Perda Niedda skarn hosts magnetite, fluorite, cassiterite and minor sulfides in a garnet- (clinopyroxene)-amphibole-chlorite association at contact with granites. At Monte Tamara, scheelite-bearing hydrothermal veins and clinopyroxene-garnet skarns occur with minor cassiterite-stannite-molybdenite and Bi sulfosalts. Base-metal sulfides with subordinate magnetite-cassiterite-fluorite veinlets prevail at Rosas. Clinopyroxene, garnet and epidote mineral chemistry from the three locations allows a detailed reconstruction of the mineralised systems, in terms of proximity to causative intrusion, compositional variations of ores and Sn-W and CRM enrichment. Overall, the highlighted common features of the three skarns indicate that they may be framed within a single, district-scale Sn-W skarn system. Overall, their different mineralogy and geochemical fingerprint reflect formation mechanisms controlled by their distance from the causative intrusionItems in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.