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

TitleTourmalines from the Koktokay No.3 pegmatite, Altai, NW China: Spectroscopic characterization and relationships with the pegmatite evolution
Authors
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/
Citation
European Journal Of Mineralogy, 2008, v. 20 n. 1, p. 143-154 How to Cite?
Abstract
Mössbauer 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.
Persistent Identifierhttp://hdl.handle.net/10722/151236
ISSN
2013 Impact Factor: 1.506
2013 SCImago Journal Rankings: 0.975
ISI Accession Number ID
References

 

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
DC FieldValueLanguage
dc.contributor.authorZhang, Aen_US
dc.contributor.authorWang, Ren_US
dc.contributor.authorLi, Yen_US
dc.contributor.authorHu, Hen_US
dc.contributor.authorLu, Xen_US
dc.contributor.authorJi, Jen_US
dc.contributor.authorZhang, Hen_US
dc.date.accessioned2012-06-26T06:19:06Z-
dc.date.available2012-06-26T06:19:06Z-
dc.date.issued2008en_US
dc.identifier.citationEuropean Journal Of Mineralogy, 2008, v. 20 n. 1, p. 143-154en_US
dc.identifier.issn0935-1221en_US
dc.identifier.urihttp://hdl.handle.net/10722/151236-
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.en_US
dc.languageengen_US
dc.publisherE Schweizerbart'sche Verlagsbuchhandlung. The Journal's web site is located at http://www.schweizerbart.de/j/ejm/en_US
dc.relation.ispartofEuropean Journal of Mineralogyen_US
dc.subjectChinaen_US
dc.subjectFourier Transform Infrared Spectroscopyen_US
dc.subjectMössbauer Spectroscopyen_US
dc.subjectReflectance Spectroscopyen_US
dc.subjectThe Koktokay No.3 Pegmatiteen_US
dc.subjectTourmalineen_US
dc.titleTourmalines from the Koktokay No.3 pegmatite, Altai, NW China: Spectroscopic characterization and relationships with the pegmatite evolutionen_US
dc.typeArticleen_US
dc.identifier.emailLi, Y:yiliang@hkucc.hku.hken_US
dc.identifier.authorityLi, Y=rp01354en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1127/0935-1221/2008/0020-1779en_US
dc.identifier.scopuseid_2-s2.0-40949145722en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-40949145722&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume20en_US
dc.identifier.issue1en_US
dc.identifier.spage143en_US
dc.identifier.epage154en_US
dc.identifier.isiWOS:000254250000011-
dc.publisher.placeGermanyen_US
dc.identifier.scopusauthoridZhang, A=7402772909en_US
dc.identifier.scopusauthoridWang, R=7405336696en_US
dc.identifier.scopusauthoridLi, Y=27171876700en_US
dc.identifier.scopusauthoridHu, H=7404097050en_US
dc.identifier.scopusauthoridLu, X=8094580900en_US
dc.identifier.scopusauthoridJi, J=7201361956en_US
dc.identifier.scopusauthoridZhang, H=7409198999en_US
dc.identifier.citeulike2416193-

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