Alkali-deficient tourmaline from the Sullivan Pb-Zn-Ag deposit, British Columbia
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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 geochemical environment that is either alkali-depleted overall or one in which the alkalis preferentially partitioned into coexisting minerals (e.g. albite).
Some of the alkali-deficient tourmalines have unusually high Mn contents (up to 1.5 wt.% MnO) compared to other Sullivan tourmalines. Manganese has a strong preference for incorporation into coexisting garnet and carbonate at Sullivan, thus many tourmalines in Mn-rich rocks are poor in Mn (<0.2 wt.% MnO). It appears that the dominant controls over the occurrence of Mn-rich tourmalines at Sullivan are the local availability of Mn and the lack of other coexisting minerals that may preferentially incorporate Mn into their structures.
Suggested Citation
Jiang, S., Slack, J.F., Palmer, M.R., 1997, Alkali-deficient tourmaline from the Sullivan Pb-Zn-Ag deposit, British Columbia: Mineralogical Magazine, v. 61, no. 409, p. 853-860, https://doi.org/10.1180/minmag.1997.061.409.08.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Alkali-deficient tourmaline from the Sullivan Pb-Zn-Ag deposit, British Columbia |
| Series title | Mineralogical Magazine |
| DOI | 10.1180/minmag.1997.061.409.08 |
| Volume | 61 |
| Issue | 409 |
| Publication Date | July 05, 2018 |
| Year Published | 1997 |
| Language | English |
| Publisher | Cambridge University Press |
| Contributing office(s) | Geology, Energy & Minerals Science Center |
| Description | 8 p. |
| First page | 853 |
| Last page | 860 |
| Country | Canada |
| Other Geospatial | British Columbia |