Torres-Ruiz, J., Pesquera, A., López Sánchez-Vizcaíno, V. (2003) Chromian tourmaline and associated Cr-bearing minerals from the Nevado-Fildbride Complex (Betic Cordilleras, SE Spain) Mineralogical Magazine, 67 (3) 517-533 doi:10.1180/0026461036730114
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Chromian tourmaline and associated Cr-bearing minerals from the Nevado-Fildbride Complex (Betic Cordilleras, SE Spain) | ||
| Journal | Mineralogical Magazine | ||
| Authors | Torres-Ruiz, J. | Author | |
| Pesquera, A. | Author | ||
| López Sánchez-Vizcaíno, V. | Author | ||
| Year | 2003 (June) | Volume | 67 |
| Page(s) | 517-533 | Issue | 3 |
| Publisher | Mineralogical Society | ||
| DOI | doi:10.1180/0026461036730114Search in ResearchGate | ||
| Mindat Ref. ID | 243443 | Long-form Identifier | mindat:1:5:243443:2 |
| GUID | 38f7705e-66c1-498d-a4e6-972ff4e8c66a | ||
| Full Reference | Torres-Ruiz, J., Pesquera, A., López Sánchez-Vizcaíno, V. (2003) Chromian tourmaline and associated Cr-bearing minerals from the Nevado-Fildbride Complex (Betic Cordilleras, SE Spain) Mineralogical Magazine, 67 (3) 517-533 doi:10.1180/0026461036730114 | ||
| Plain Text | Torres-Ruiz, J., Pesquera, A., López Sánchez-Vizcaíno, V. (2003) Chromian tourmaline and associated Cr-bearing minerals from the Nevado-Fildbride Complex (Betic Cordilleras, SE Spain) Mineralogical Magazine, 67 (3) 517-533 doi:10.1180/0026461036730114 | ||
| Abstract/Notes | AbstractChromian tourmaline, in association with other Cr-bearing minerals (amphibole, mica, epidote, chlorite, titanite, rutile and chromian spinel), occurs in fine calc-schist levels within metacarbonate rocks from the Nevado-Filabride Complex, SE Spain. Electron microprobe analyses of tourmaline and coexisting minerals document both chemical differences dependent on the host-rock type and an irregular distribution of Cr at grain scale. Tourmaline is Na-rich dravite, with average Mg/(Mg+Fe) ratios of 0.83 and 0.63 a.p.f.u. and Cr contents of 0.32 and 0.18 a.p.f.u., in dolomitic and ankeritic marbles, respectively. Tourmaline contains small but significant concentrations of Zn (av. 0.01 a.p.f.u.) and in ankeritic marble it also contains Ni (av. 0.04 a.p.f.u.). Zn-rich chromian spinel appears as small relict inclusions in silicates, with average Cr, Fe, Al and Zn contents of 1.201, 1.241, 0.411 and 0.107 a.p.f.u., respectively. Amphibole, epidote, mica and chlorite show average Cr contents of 0.088, 0.138, 0.115 and 0.267 a.p.f.u., respectively, in dolomitic marbles, and 0.103, 0.078, 0.065 and 0.185 a.p.f.u., respectively, in ankeritic marbles. Cr-silicates formed through metamorphic reactions involving detrital Cr-rich spinel, in addition to clay minerals and carbonates. The B necessary to form tourmaline was probably derived from the leaching of underlying evaporitic rocks. | ||
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