• journal_title：European Journal of Mineralogy
• Contributor：Ivan A. Baksheev ; Vsevolod Yu Prokof’ev ; Georgii P. Zaraisky ; Andrey F. Chitalin ; Vasilii O. Yapaskurt ; Yuri N. Nikolaev ; Petr L. Tikhomirov ; Ekaterina V. Nagornaya ; Lubov’ I. Rogacheva ; Nina V. Gorelikova ; Oleg V. Kononov
• Publisher：E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
• Date：2012-10-01
• Format：text/html
• Language：en
• Identifier：10.1127/0935-1221/2012/0024-2241
• journal_abbrev：Eur J Mineral
• issn：0935-1221
• volume：24
• issue：6
• firstpage：957
• section：Articles

Tourmaline-supergroup minerals are proposed as efficient indicators of porphyry-style Cu, Au and Sn deposits and therefore are considered as useful for both the prospection and exploration of these important mineral deposits. The tourmaline-supergroup minerals from the porphyry deposits exhibit some general features: (1) sector and oscillatory chemical zoning of crystals; (2) presence in several generations; (3) Fe → Al coupled substitution; (4) evolution from Fe-rich to Mg-rich varieties resulting from sulphide deposition at the late stage; (5) Li concentration ranging from a few to ~30 ppm. On the other hand, there are distinguishing features for tourmalines from different deposits: (1) total Mg content is ~2 apfu for tourmaline in the Cu deposits, 1–2 apfu in the Au deposits, and 0–1 apfu in Sn deposits; (2) maximum Fe_tot ~3 apfu (Cu, Sn) and ~5 apfu (Au), (3) maximum F content up to 0.1 apfu (Cu, Au) and up to 0.5 apfu (Sn); (4) Fe³⁺/Fe_tot ~0.5–0.8 (Cu, Au) and ~0.2 (Sn).