Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

QUE 94535

Newsletter

19,1

Location

Queen Alexandra Range

Field Number

10235

Dimensions (cm)

2.4 x 2.3 x 0.8

Weight (g)

11.30

Original Classification

Chondrite (Anomalous)

Updated Classification

Winonaite

Mineral Composition (%Fa & %Fs)

Fayalite (mol%): 1-3;Ferrosilite (mol%): 1-2

Weathering

Fracturing

Macroscopic Description - Roberta Score

There is nothing pretty about this extensively weathered stone. Ten percent of the thin brown fusion crust remains. The interior is red-brown.

Thin Section Description (,2) - Brian Mason

The section shows a finely granular aggregate of olivine and pyroxene (average grain size about 0.02 mm) with a few coarser areas (possibly vestigial chondrules); about 20% of nickel-iron and troilite are present, much of the metal as thin veinlets throughout the section. The metal is extensively weathered to brown limonite. The olivine and pyroxene are iron-poor: olivine, Fa_1-3; pyroxene, Fs_1-2. The nickel-iron contains 0.1-0.2% Si. The meteorite is classified as an anomalous chondrite; it resembles Pontlyfni (Mineral Mag., v. 41, p. 201, 1977).

Reclassification Notes (AMN OUTSIDE)

QUE 94535 was re-classified to a winonaite based on information reported by Benedix et al. (1998) Geochimica et Cosmochimica Acta, 62, 2535-2553.

Antarctic Meteorite Images for Sample QUE 94535

Lab Photo(s) :

Antarctic Meteorite Images for Sample QUE 94535

Thin Section Photo(s) :

Thin Section Photograph of Sample QUE 94535 in Cross-Polarized Light

Thin Section Photograph of Sample QUE 94535 in Plane-Polarized Light

References for Sample QUE94535

Tomkins, A.G., Johnson, T.E., Mitchell, J.T., 2020, A review of the chondrite-achondrite transition, and a metamorphic facies series for equilibrated primitive stony meteorites. Meteoritics & Planetary Science, 55, 857-885, doi: 10.1111/maps.13472.

Hunt, A. C., Benedix, G. K., Hammond, S. J., Bland, P. A., Rehkämper, M., Kreissig, K., & Strekopytov, S. , 2017, A geochemical study of the winonaites: Evidence for limited partial melting and constraints on the precursor composition. . Geochimica et Cosmochimica Acta, 199, 13-30, http://dx.doi.org/10.1016/j.gca.2016.10.043.

Caporali, S., Cecchi, V. M., 2015, Petrologic and Minerochemical Trends of Acapulcoites, Winonaites and Lodranites: New Evidence from Image Analysis and EMPA Investigations. Geosciences, 5(3), 222-242.

Greenwood, R. C., Franchi, I. A., Gibson, J. M., Benedix, G. K., 2012, Oxygen isotope variation in primitive achondrites: The influence of primordial, asteroidal and terrestrial processes. Geochimica et Cosmochimica Acta, 94, 1-Oct-12, 146-163, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2012.06.025.

Rochette, P., Gattacceca, J., Bourot-Denise, M., Consolmagno, G., Folco, L., Kohout, T., Pesonen, L., Sagnotti, L., 2009, Magnetic classification of stony meteorites: 3. Achondrites. Meteoritics & Planetary Science, 44, 405-427, http://dx.doi.org/10.1111/j.1945-5100.2009.tb00741.x.

Benedix, G. K., Mccoy, T. J., Keil, K., Bogard, D. D., Garrison, D. H., 1998, A petrologic and isotopic study of winonaites: evidence for early partial melting, brecciation, and metamorphism. Geochimica et Cosmochimica Acta, 62 Issue 14, Jul-98, 2535-2553, ISSN 0016-7037, http://dx.doi.org/10.1016/S0016-7037(98)00166-5.

RELAB, , Reflectance Experiment Lab , catalogue of samples.

, PLATE Preface-Pictorial Guide to Selected Meteorites, 2015, In Righter, K., Corrigan, C.M., McCoy, T.J., and Harvey, R.P. Meteorites: A Pictorial Guide to the Collection, First Edition, AGU Wiley, Book Plates.

Antarctic Meteorite Petrographic Description

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