Mineralogy of the scheelite-bearing ores of Monte Tamara, SW Sardinia: insights for the evolution of a Late Variscan W–Sn skarn system

Abstract

This is a 'preproof' accepted article for Mineralogical Magazine. This version may be subject to change during the production process.

Post-Collisional Tectonomagmatic Evolution, Crustal Reworking and Ore Genesis along a Section of the Southern Variscan Belt: The Variscan Mineral System of Sardinia (Italy)

“…(1) Skarn systems, including compositionally heterogeneous Fe-Pb-Zn-Cu ± F ± Sn ± W ± Bi ± As oxidized skarns [128] associated with GS1 suite granites, like the Sulcis and Monte Linas plutons [40,[129][130][131][132][133], and Fe-Cu ± Pb-Zn, ±Ag-Au, ±W, ±LREE reduced skarns, are more diffused in central-eastern Sardinia [79,134,135]; mineralized ores of both types of skarn systems are typically hosted in retrocessed exoskarns, forming massive to lentiform or vein-type bodies [129,133,135]; high contents of rare metals are also reported in primary skarns and related hornfelses [79,133]. (2) Mo-(W-Sn-Bi ± Cu ± Au) endo-and exo-greisens; in 1980s studies [124,125], these ores have been interpreted as porphyry-Mo deposits; in S Sardinia, Mo-bearing deposits and occurrences are exclusive of the GS1 suite of granites, but they are also present in E Sardinia (e.g., Goene: Table 3) and in the Oschiri-Alà dei Sardi district of N Sardinia [125], always associated with YMP granites; (3) Greisen-related Sn-W-Mo-Bi (±As, ±F) vein systems, constantly related to GS1 suite granites [40,136].…”