Macroscopically-Zoned Grandite from the Garnetite Skarn of Meka Presedla (Kopaonik Mountain, Serbia)
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This study was financially supported by the Serbian Ministry of Science and Environmental Protection (project no. 1992 and 142055). The authors are indebted to Professor Aleksandar Kremenovi? for useful suggestions, MSc Maja Poznanovi? for the wet-chemical analyses, Miss Aleksandra Radulovi? for assistance in the FT–IR absorption spectra collection, Miss Sla?ana Du?ani? and Dr Suzana Eri? for their assistance with optical transmission microscopy, and Mr Milutin ?or?evi? for his help in the mechanical separation of the garnet zones.


Macroscopically-Zoned Grandite from the Garnetite Skarn of Meka Presedla (Kopaonik Mountain, Serbia)
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    摘要:

    The macroscopically-zoned grandite from the garnetite skarn of Meka Presedla (Kopaonik Mountain, Serbia) was studied with optical microscopy, electron microprobe analysis (EMPA), Fourier transform infra-red (FT–IR), and Raman methods. The EMPA results indicate that the main core–rim compositional variations (Ca2.93–2.97Mn0.05–0.06Mg0.00–0.01Al1.14–1.26Fe3+0.72–0.83Ti0.00–0.02Si2.97–3.02O12) slightly differ along the zones, showing evidence for a quasi-cyclic alternation of the oscillatory zoning nature. Among this, considerable variation is observed only by the Al–Fe3+ substitutions in the octahedral site. The EMPA also indicate that the grandite zones compositionally vary, mostly within ±1 and ±2 mol% of the homogeneity level range, that is, Grs64±1Adr36±1Sps2 (A), Grs62±1Adr38±1Sps2 (B), Grs59±2Adr40±2Sps2 (C), Grs58±2Adr41±2Sps2 (D), and Grs58±1Adr41±1Sps2 (E). Therefore, the investigated garnet can be considered as relatively highly homogeneous. The majority of compositions lie within the narrow miscibility region of 0.58±2

    Abstract:

    The macroscopically-zoned grandite from the garnetite skarn of Meka Presedla (Kopaonik Mountain, Serbia) was studied with optical microscopy, electron microprobe analysis (EMPA), Fourier transform infra-red (FT–IR), and Raman methods. The EMPA results indicate that the main core–rim compositional variations (Ca2.93–2.97Mn0.05–0.06Mg0.00–0.01Al1.14–1.26Fe3+0.72–0.83Ti0.00–0.02Si2.97–3.02O12) slightly differ along the zones, showing evidence for a quasi-cyclic alternation of the oscillatory zoning nature. Among this, considerable variation is observed only by the Al–Fe3+ substitutions in the octahedral site. The EMPA also indicate that the grandite zones compositionally vary, mostly within ±1 and ±2 mol% of the homogeneity level range, that is, Grs64±1Adr36±1Sps2 (A), Grs62±1Adr38±1Sps2 (B), Grs59±2Adr40±2Sps2 (C), Grs58±2Adr41±2Sps2 (D), and Grs58±1Adr41±1Sps2 (E). Therefore, the investigated garnet can be considered as relatively highly homogeneous. The majority of compositions lie within the narrow miscibility region of 0.58±2

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Pavle Tan?i?, *, Predrag Vuli?, Reinhard Kaindl, Bernhard Sartory and Radovan Dimitrijevi?.2012. Macroscopically-Zoned Grandite from the Garnetite Skarn of Meka Presedla (Kopaonik Mountain, Serbia)[J]. ACTA GEOLOGICA SINICA(English edition),86(2):394~405

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  • 收稿日期:2010-09-26
  • 最后修改日期:2011-09-19
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