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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
2013 Impact Factor: 1.506
2013 SCImago Journal Rankings: 0.975
 
DOIhttp://dx.doi.org/10.1127/0935-1221/2008/0020-1779
 
ISI Accession Number IDWOS:000254250000011
 
ReferencesReferences in Scopus
 
DC FieldValue
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
2013 Impact Factor: 1.506
2013 SCImago Journal Rankings: 0.975
 
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
 
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<contributor.author>Lu, X</contributor.author>
<contributor.author>Ji, J</contributor.author>
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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