Summary
Single crystals of paragenetic garnet (gt), omphacite (cpx) and kyanite (ky) were isolated from an eclogite xenolith from the Zagadochnaya kimberlite, Yakutia (grospydite Z13) and studied by polarized FTIR-microspectrometry in the OH valence vibrational region and by microprobe analyses. The coexisting minerals are homogeneous with respect to major and minor elements and have compositions near gross49pyr26alm20uvar4 (gt), jad45dio47hed6kos2 (cpx) and ky>97. Single crystal spectra show one νOH-band for gt at 3630 cm−1 (halfwidth ca. 100 cm−1) which is very likely caused by vibrations of tetrahedral (OH)4-4− clusters replacing SiO4 4− tetrahedra. Cpx shows one strong, but weakly pleochroic band at 3464 cm−1 (halfwidth ca. 160 cm−1) and a weak satellite band centered at 3620 cm−1) with a distinct pleochroism. Ky OH spectra exhibit two sets of weak sharp pleochroic bands, a triplet, characteristic for high pressure ky, at 3439, 3410, 3387 cm−1) and a doublet at 3279, 3264 cm−1) (halfwidths ca. 10 cm−1) From integral and linear absorbances in the unpolarized spectra defect-hydroxyl contents in the three coexisting minerals were estimated and found near O.OX wt% H2O. The distribution scheme of hydrogen in the paragenetic minerals was evaluated to be cky < ccpx ≪< cgt.
Zusammenfassung
Aus einer Granat (Gt)-Omphacit (Cpx)-Kyanit (Ky) Paragenese eines Eklogit Xenoliths aus dem Zagadochnaya Kimberlit, Jakutien (Grospydit Z13), wurden Einkristalle isoliert und mit polarisierter FTIR-Mikrospektrometrie im OH Valenzschwingungsbereich und mit der Elektronenstrahl-Mikrosonde untersucht. Die koexistierenden Minerale sind hinsichtlich ihrer Haupt- und Nebenelemente homogen und haben Zusammen setzungen von etwa Gross49Pyr26Alm20Uvar4 (Gt), Jad45Dio47Hed6Kos2 (Cpx) and Ky>97 Einkristallspektren von Gt zeigen eine νOH-Bande bei 3630 cm−1) (Halbwerts breite ca. 100 cm−1) die wahrscheinlich von Schwingungen tetraedrischer (OH)4 4− Gruppen, die SiO4 4− Tetraeder ersetzen, herrührt. Cpx zeigt eine starke, aber schwach pleochroitische Bande bei 3464 cm−1 (Halbwertsbreite ca. 160 cm−1) and eine schwache, deutlich pleochroitische Satellitenbande bei 3620 cm−1) Ky OH Spektren zeigen zwei Gruppen von schwachen, scharfen pleochroitischen Banden, ein fur Hochdruck Ky charakteristisches Bandentriplett bei 3439, 3410, 3387 cm−1) and ein Bandendublett bei 3279, 3264 cm−1) (Halbwertsbreiten ca. 10 cm−1) Aus den integralen and linearen Extinktionen der nicht-polarisierten Spektren wurde der Defekt-Hydroxyl Gehalt der drei koexistierenden Minerale abgeleitet and mit O.OX Gew% H2O festgelegt. Das Verteilungsschema des Wasserstoffs kann in der Mineralparagenese mit cKy < cCpx ≪ cGt angegeben werden.
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Dedicated to Prof. Dr. J. Zemann on the occasion of his 70th birthday
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Beran, A., Langer, K. & Andrut, M. Single crystal infrared spectra in the range of OH fundamentals of paragenetic garnet, omphacite and kyanite in an eklogitic mantle xenolith. Mineralogy and Petrology 48, 257–268 (1993). https://doi.org/10.1007/BF01163102
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DOI: https://doi.org/10.1007/BF01163102