Article: Tourmalines from the Koktokay No.3 pegmatite, Altai, NW China: Spectroscopic characterization and relationships with the pegmatite evolution

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TitleTourmalines from the Koktokay No.3 pegmatite, Altai, NW China: Spectroscopic characterization and relationships with the pegmatite evolution
AuthorsZhang, A2 4
Wang, R2
Li, Y3
Hu, H2
Lu, X2
Ji, J2
Zhang, H1
KeywordsChina
Fourier Transform Infrared Spectroscopy
Mössbauer Spectroscopy
Reflectance Spectroscopy
The Koktokay No.3 Pegmatite
Tourmaline
Issue Date2008
PublisherE Schweizerbart'sche Verlagsbuchhandlung. The Journal's web site is located at http://www.schweizerbart.de/j/ejm/
CitationEuropean Journal Of Mineralogy, 2008, v. 20 n. 1, p. 143-154 [How to Cite?]
DOI: http://dx.doi.org/10.1127/0935-1221/2008/0020-1779
AbstractMössbauer spectra (MS), infrared spectra (IR) in the OH stretching region, and reflectance spectra (RS) were obtained for natural tourmalines from the Koktokay No.3 pegmatite, the contact zone, and the altered country rock, Altai, NW China. Black Fe-rich dravite in the altered country rock and black Fe-rich dravite + schorl-foitite have the lowest degree of Fe2+ ordering at Y-site and a high Fe3+/Fe2+ ratio (0.35 and 0.30, respectively). Black elbaite-schorl in zones I to IV has a moderate degree of Fe2+ ordering at Y-site and a low Fe3+/ Fe2+ ratio (0.11-0.18). Green elbaite in the inner pegmatite has the highest degree of Fe2+ ordering at Y-site and contains no ferric iron. Tourmalines from the altered country rock, the contact zone, and zones I to IV of the pegmatite contain only OH- and no molecular water, whereas those from zones V to VIII of the pegmatite contain both OH- and molecular water. Variations of degrees of Fe2+ ordering at Y-site of tourmaline crystal structure are generally consistent with the magmatic to hydrothermal evolution of the Koktokay No.3 pegmatite. However, the lowest degrees of Fe2+ ordering at Y-site of tourmalines from the altered country rock and the contact zone are probably caused by rapid consolidation rates. The presence of molecular water in tourmalines from zones V to VIII reflects an increase of water fugacity during fractionation evolution of the pegmatite. The fact that molecular water is absent in tourmaline from the altered country rock and the contact zone suggests that there was a very low water fugacity during the interaction between fluids from the pegmatite and the country rock. The variation of Fe3+/Fe2+ ratio suggests a decreasing oxidation state from the altered country rock across the contact zone through zones I-IV to zones V-VIII of the pegmatite, and generally consistent with previous investigations. © 2008 E. Schweizerbart'sche Verlagsbuchhandlung.
ISSN0935-1221
2011 Impact Factor: 1.486
2011 SCImago Journal Rankings: 0.072
DOIhttp://dx.doi.org/10.1127/0935-1221/2008/0020-1779
ISI Accession Number IDWOS:000254250000011
ReferencesReferences in Scopus
DC Field
Value
dc.contributor.authorZhang, A
dc.contributor.authorWang, R
dc.contributor.authorLi, Y
dc.contributor.authorHu, H
dc.contributor.authorLu, X
dc.contributor.authorJi, J
dc.contributor.authorZhang, H
dc.date.accessioned2012-06-26T06:19:06Z
dc.date.available2012-06-26T06:19:06Z
dc.date.issued2008
dc.description.abstractMössbauer spectra (MS), infrared spectra (IR) in the OH stretching region, and reflectance spectra (RS) were obtained for natural tourmalines from the Koktokay No.3 pegmatite, the contact zone, and the altered country rock, Altai, NW China. Black Fe-rich dravite in the altered country rock and black Fe-rich dravite + schorl-foitite have the lowest degree of Fe2+ ordering at Y-site and a high Fe3+/Fe2+ ratio (0.35 and 0.30, respectively). Black elbaite-schorl in zones I to IV has a moderate degree of Fe2+ ordering at Y-site and a low Fe3+/ Fe2+ ratio (0.11-0.18). Green elbaite in the inner pegmatite has the highest degree of Fe2+ ordering at Y-site and contains no ferric iron. Tourmalines from the altered country rock, the contact zone, and zones I to IV of the pegmatite contain only OH- and no molecular water, whereas those from zones V to VIII of the pegmatite contain both OH- and molecular water. Variations of degrees of Fe2+ ordering at Y-site of tourmaline crystal structure are generally consistent with the magmatic to hydrothermal evolution of the Koktokay No.3 pegmatite. However, the lowest degrees of Fe2+ ordering at Y-site of tourmalines from the altered country rock and the contact zone are probably caused by rapid consolidation rates. The presence of molecular water in tourmalines from zones V to VIII reflects an increase of water fugacity during fractionation evolution of the pegmatite. The fact that molecular water is absent in tourmaline from the altered country rock and the contact zone suggests that there was a very low water fugacity during the interaction between fluids from the pegmatite and the country rock. The variation of Fe3+/Fe2+ ratio suggests a decreasing oxidation state from the altered country rock across the contact zone through zones I-IV to zones V-VIII of the pegmatite, and generally consistent with previous investigations. © 2008 E. Schweizerbart'sche Verlagsbuchhandlung.
dc.description.natureLink_to_subscribed_fulltext
dc.identifier.citationEuropean Journal Of Mineralogy, 2008, v. 20 n. 1, p. 143-154 [How to Cite?]
DOI: http://dx.doi.org/10.1127/0935-1221/2008/0020-1779
dc.identifier.citeulike2416193
dc.identifier.doihttp://dx.doi.org/10.1127/0935-1221/2008/0020-1779
dc.identifier.epage154
dc.identifier.isiWOS:000254250000011
dc.identifier.issn0935-1221
2011 Impact Factor: 1.486
2011 SCImago Journal Rankings: 0.072
dc.identifier.issue1
dc.identifier.scopuseid_2-s2.0-40949145722
dc.identifier.spage143
dc.identifier.urihttp://hdl.handle.net/10722/151236
dc.identifier.volume20
dc.languageeng
dc.publisherE Schweizerbart'sche Verlagsbuchhandlung. The Journal's web site is located at http://www.schweizerbart.de/j/ejm/
dc.publisher.placeGermany
dc.relation.ispartofEuropean Journal of Mineralogy
dc.relation.referencesReferences in Scopus
dc.subjectChina
dc.subjectFourier Transform Infrared Spectroscopy
dc.subjectMössbauer Spectroscopy
dc.subjectReflectance Spectroscopy
dc.subjectThe Koktokay No.3 Pegmatite
dc.subjectTourmaline
dc.titleTourmalines from the Koktokay No.3 pegmatite, Altai, NW China: Spectroscopic characterization and relationships with the pegmatite evolution
dc.typeArticle
Author Affiliations
  1. Institute of Geochemistry Chinese Academy of Sciences
  2. Nanjing University
  3. University of Tennessee, Knoxville
  4. Purple Mountain Observatory Chinese Academy of Sciences