1997
DOI: 10.1180/minmag.1997.061.409.08
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Alkali-deficient tourmaline from the Sullivan Pb-Zn-Ag deposit, British Columbia

Abstract: Alkali-deficient tourmalines are found in albitized rocks from the hanging-wall of the Sullivan Pb-Zn-Ag deposit (British Columbia, Canada). They approximate the Mg-equivalent of foitite with an idealized formula □(Mg2Al)Al6Si6O18(BO3)3(OH)4. Major chemical substitutions in the tourmalines are the alkali-defect type [Na*(x) + Mg*(Y) = □(x) + Al(Y)] and the uvite type [Na*(x) + Al(Y) = Ca(x) + Mg*(Y)], where Na* = Na + K, Mg* = Mg + Fe + Mn. The occurrence of these alkali-deficient tourmalines reflects a unique… Show more

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Cited by 7 publications
(5 citation statements)
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“…Although a volumetrically minor phase, ilmenite can incorporate significant amounts of Mn (e.g. Jiang, Palmer, & Slack, ; Mitchel & Liferovich, ; Suwa, Enami, Hiraiwa, & Yang, ), such that an investigation of ilmenite in relation to the highly Mn‐dependent nature of garnet stability is warranted.…”
Section: Introductionmentioning
confidence: 99%
“…Although a volumetrically minor phase, ilmenite can incorporate significant amounts of Mn (e.g. Jiang, Palmer, & Slack, ; Mitchel & Liferovich, ; Suwa, Enami, Hiraiwa, & Yang, ), such that an investigation of ilmenite in relation to the highly Mn‐dependent nature of garnet stability is warranted.…”
Section: Introductionmentioning
confidence: 99%
“…11). In the mica-rich matrix either: (a) ilmenite recrystallises at the garnet isograd releasing Mn for garnet growth (Woodsworth, 1977; Jiang et al , 1996) and Zr for zircon; or (b) finer grained fragments of the more metamict detrital zircon are more reactive and dissolve further as fluid is released during garnet forming reactions (Dempster and Chung, 2013). Formation of abundant micro-zircon in garnet is therefore a result of micro-zircon encapsulation from the matrix but also formation of new micro-zircon where the Zr is derived from dissolution of detrital and micro-zircon at the garnet growing face and potentially the recrystallisation of ilmenite.…”
Section: Discussionmentioning
confidence: 99%
“…Foitite may be found as hair-like crystals in pockets of granitic pegmatites and some hydrothermally affected rocks (e.g., Foit et al 1989, Pezzotta et al 1996, Aurisicchio et al 1999, Francis et al 1999, Novák & Taylor 2000, Medaris et al 2003, and in some cases, it is described as the initial generation of fibrous tourmaline that replaces elbaite (e.g., Dutrow & Henry 2000) and as the fibrous tourmaline of replacement origin in fractured pre-existing tourmaline (e.g., Henry et al 2002). However, magnesiofoitite has been reported in only two localities, the Sullivan Pb-Zn-Ag deposit, British Columbia (Jiang et al 1997) and the Kyonosawa area, Japan (Hawthorne et al 1999), and rossmanite has been described only at the type locality (Selway et al 1998); recently, "oxy-foitite" was described from the Baraboo quartzite, Wisconsin (Medaris et al 2003). Clearly, investigations of X-site-vacant tourmalines are rather limited.…”
Section: Introductionmentioning
confidence: 99%