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

作者：Tancic Pavle^*; Vulic Predrag; Kaindl Reinhard; Sartory Bernhard; Dimitrijevic Radovan

来源：Acta Geologica Sinica (English Edition), 2012, 86(2): 393-406.

DOI：10.1111/j.1755-6724.2012.00668.x

• grandite
• anisotropy
• compositional variation
• zone homogeneities
• miscibility region

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 (FTIR), and Raman methods. The EMPA results indicate that the main corerim compositional variations (Ca2.932.97Mn0.050.06Mg0.000.01Al1.141.26Fe3+0.720.83 Ti0.000.02Si2.973.02O12) 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 AlFe3+ 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%26lt;XGrs%26lt;0.64 +/- 1, without gaps, and with only three outliers near the zone boundaries of approximately 0.38%26lt;XGrs%26lt;0.52. FTIR and Raman bands are almost constant within the zones and adequate to the chemical compositions. All of the zones should be considered as anhydrous. From the results, formation temperatures between similar to 600 and 720 degrees C, and pressures of similar to kbars, are derived. Among five possible causes for the slightly optical anisotropy of grandite, three were reconsidered, and consequently rejected.

• 出版日期2012-4