Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

MET 01017

Newsletter

26,2

Location

Meteorite Hills

Field Number

13814

Dimensions (cm)

7.5 x 5.0 x 3.5

Weight (g)

238.00

Original Classification

CR2 Chondrite

Updated Classification

CV3 Chondrite (Anomalous)

Mineral Composition (%Fa & %Fs)

Fayalite (mol%): 3-19;Ferrosilite (mol%): 2-26

Weathering

Fracturing

Macroscopic Description - Kathleen McBride

50% of the exterior has weathered fusion crust with oxidation haloes and polygonal fractures. The interior is very fractured and weathered. It is friable with an abundant amount of rust. Some light colored mm-sized condrules are visible.

Thin Section Description (,2) - Tim McCoy, Linda Welzenbach

The section exhibits large (up to 2 mm), well-defined, metal-rich chondrules and CAI's in a dark matrix of FeO-rich phyllosilicate. Weathering is extensive, with staining, patches and veins of hydrated iron oxide. Silicates are unequilibrated; olivines range from Fa_3-19 and pyroxenes from Fs_2-26. The meteorite is a CR2 chondrite.

Reclassification Notes (AMN 33,1)

Original classification in AMN 26, no. 2, as a CR2 chondrite, but several studies have brought information to light that is inconsistent with that classification. Raman data, as well as isotopic data for C, H, and O indicate this meteorite is not a CR2, but a CV3 (possibly reduced) chondrite ([1] Busemann et al., 2007). Because the type of CV3 is not clear, and it has anomalous properties, we will reclassify it as CV3 an.

References:

[1] Busemann, H. et al., (2007) Characterization of insoluble organic matter in primitive meteorites by microRaman spectroscopy. Meteoritics & Planetary Science 42, 1387–1416.

Antarctic Meteorite Images for Sample MET 01017

Field Photo(s) :

ANSMET MET 01017 - Field Number: 13814, NASA Photo Number: jsc2018e097605

Field photo image(s) courtesy of the ANSMET (ANtarctic Search for METeorites) Program, Case Western Reserve University and the University of Utah

Antarctic Meteorite Images for Sample MET 01017

Lab Photo(s) :

References for Sample MET01017

Tanbakouei, S., Trigo-Rodriguez, J.M., Llorca, J., Moyano-Cambero, C.E., Williams, I.P., and Rivkin, A.S., 2021, The reflectance spectra of CV–CK carbonaceous chondrites from the near-infrared to the visible. , Monthly Notices of the Royal Astronomical Society, 507 , 651–662 , https://doi.org/10.1093/mnras/stab2146 .

Starkey, N. A., Franchi, I. A., Alexander, C. M. O'D., 2013, A Raman spectroscopic study of organic matter in interplanetary dust particles and meteorites using multiple wavelength laser excitation. , Meteoritics & Planetary Science, 48 , 1800-1822 , http://dx.doi.org/10.1111/maps.12196 .

Schrader, D. L., Franchi, I. A., Connolly Jr., H. C., Greenwood, R. C., Lauretta, D. S., Gibson, J. M., 2011, The formation and alteration of the Renazzo-like carbonaceous chondrites I: Implications of bulk-oxygen isotopic composition. , Geochimica et Cosmochimica Acta, 75 Issue 1 , 1-Jan-11 , 308-325 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2010.09.028 .

Rochette, P., Kohout, T., Pesonen, L., Quirico, E., Sagnotti, L., Skripnik, A., Gattacceca, J., Bonal, L., Bourot-Denise, M., Chevrier, V., Clerc, J. P., Consolmagno, G., Folco, L., Gounelle, M., 2008, Magnetic classification of stony meteorites: 2. Non-ordinary chondrites. , Meteoritics & Planetary Science, 43 , 959-980 , http://dx.doi.org/10.1111/j.1945-5100.2008.tb01092.x .

Busemann, H., Alexander, C. M. O'D., Nittler, L. R., 2007, Characterization of insoluble organic matter in primitive meteorites by microRaman spectroscopy. , Meteoritics & Planetary Science, 42 , 1387-1416 , http://dx.doi.org/10.1111/j.1945-5100.2007.tb00581.x .

Alexander, C. M. O'D., Fogel, M., Yabuta, H., Cody, G. D., 2007, The origin and evolution of chondrites recorded in the elemental and isotopic compositions of their macromolecular organic matter. , Geochimica et Cosmochimica Acta, 71 Issue 17 , 1-Sep-07 , 4380-4403 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2007.06.052 .

RELAB, , Reflectance Experiment Lab , catalogue of samples, .

Antarctic Meteorite Petrographic Description

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