Tourmaline of the elbaite-schorl series from the Himalaya Mine, Mesa Grande, California: a detailed investigation:
Chemical, structural, infrared, optical, and Mössbauer spectroscopic data were obtained on tourmalines from gem pockets in the Himalaya mine, San Diego County, California, including a strongly color-zoned crystal. Calcium and Li abundances increase from core to rim, whereas Mn 2+ and F increase, re...
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| Hauptverfasser: | , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2010
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| In: |
American mineralogist
Year: 2010, Jahrgang: 95, Heft: 1, Pages: 24-40 |
| ISSN: | 1945-3027 |
| DOI: | 10.2138/am.2010.3271 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.2138/am.2010.3271 Verlag, lizenzpflichtig, Volltext: https://www.degruyterbrill.com/document/doi/10.2138/am.2010.3271/html 
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| Verfasserangaben: | Andreas Ertl, George R. Rossman, John M. Hughes, David London, Ying Wang, Julie A. O’Leary, M. Darby Dyar, Stefan Prowatke, Thomas Ludwig, Ekkehart Tillmanns |
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| 245 | 1 | 0 | |a Tourmaline of the elbaite-schorl series from the Himalaya Mine, Mesa Grande, California |b a detailed investigation: |c Andreas Ertl, George R. Rossman, John M. Hughes, David London, Ying Wang, Julie A. O’Leary, M. Darby Dyar, Stefan Prowatke, Thomas Ludwig, Ekkehart Tillmanns |
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| 520 | |a Chemical, structural, infrared, optical, and Mössbauer spectroscopic data were obtained on tourmalines from gem pockets in the Himalaya mine, San Diego County, California, including a strongly color-zoned crystal. Calcium and Li abundances increase from core to rim, whereas Mn 2+ and F increase, reach a maximum, and then decrease. Upon initiation of crystallization of lepidolite, F contents in tourmaline decrease. The black core is a Mn-bearing “oxy-schorl.” The grayish-yellow, intermediate zone is Mn-rich “fluor-elbaite” that contains a relatively high Mn content with ~6 wt% MnO. The nearly colorless “fluor-elbaite” rim has the highest Li content of all zones. There is an inverse correlation between the lattice parameter a (for values ≥15.84 Å) and the Li content (r 2 = 0.96). Mössbauer studies from the different zones within this crystal show that the Fe 3+ /Fe(total) ratio increases continuously from the Fe-rich core to the Fe-poor near-rim zone, consistent with increasing oxygen fugacity during pegmatite pocket evolution. There is a high positive correlation between lattice parameter a (for values ≥15.84 Å) and (Fe 2+ +Mn 2+ ) content in tourmalines from the elbaite-schorl series (r 2 = 0.99). Values lower than 15.84 Å for a are likely a consequence of greater [4] B contents in samples that usually have a (Fe 2+ +Mn 2+ ) content of <0.1 apfu. Positive correlations between Al at the Y site and [4] B (r 2 = 0.93), and between (Mn 2+ +Fe 2+ ) and [4] Al (r 2 = 0.99) were found in tourmalines from the Himalaya Mine. These correlations indicate that, in the short-range order configurations, Y Al is coupled with [4] B, whereas Mn 2+ and Fe 2+ are coupled with [4] Al. To obtain the most accurate OH data, different analytical methods were used: SIMS, hydrogen manometry, continuous-flow mass spectrometry, and IR overtone spectroscopy. Some elbaites contain a mixed occupation of F, OH, and O at the W site. Based on these data, the assumption OH = 4 - F appears to be valid only for elbaitic tourmalines with FeO+MnO < 8 wt%. In terms of the conditions of formation, whether gel or glass, the transition from low to high viscosity of the pocket-forming medium occurs before primary crystallization within the pockets ceased. At the pocket stage, Li contents of residual hydrosilicate melt were evidently high enough to promote a continuous transition from schorl-foitite at the pegmatite margin to elbaite-rossmanite-liddicoatite in the final stages of consolidation of the pegmatite interior. | ||
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| 650 | 4 | |a spectroscopy | |
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| 700 | 1 | |a Hughes, John M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a London, David |e VerfasserIn |4 aut | |
| 700 | 1 | |a Wang, Ying |e VerfasserIn |4 aut | |
| 700 | 1 | |a O’Leary, Julie A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Dyar, M. Darby |e VerfasserIn |4 aut | |
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| 700 | 1 | |a Ludwig, Thomas |e VerfasserIn |0 (DE-588)1069798339 |0 (DE-627)822403471 |0 (DE-576)429492197 |4 aut | |
| 700 | 1 | |a Tillmanns, Ekkehart |e VerfasserIn |4 aut | |
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