Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

MET 96503

Newsletter

21,2

Location

Meteorite Hills

Field Number

9529

Dimensions (cm)

7.5 x 5.0 x 5.5

Weight (g)

404.00

Original Classification

L3.6 Chondrite

Updated Classification

L3.10 Chondrite

Pairing

MET 96503; MET 01051; MET 01056; MET 01057; MET 96515

Mineral Composition (%Fa & %Fs)

Fayalite (mol%): 7-32

Weathering

Fracturing

Macroscopic Description - Kathleen McBride

100% of the exterior of this ordinary chondrite is covered with brown/black fusion crust and a rough surface with polygonal fractures. The exterior is striated in some areas. The interior is a dark gray matrix with numerous rusty chondrules up to 2 mm in diameter. Metal grains are present. There are also small irregular shaped dark inclusions.

Thin Section Description (,2) - Tim McCoy

The section exhibits numerous large, well-defined chondrules (up to 2 mm) in a black matrix of fine-grained silicates and weathered metal and troilite. Weak shock effects are present. Polysynthetically twinned pyroxene is extremely abundant. Silicates are unequilibrated; olivines range from Fa_7-32. The meteorite is probably an L3 chondrite (estimated subtype 3.6).

Reclassification Notes (AMN 33,1)

Original classification in AMN 21, no. 2 as a L3.6 Chondrite. Reclassified as an L3.10 Chondrite based on Cr contents of Type II chondrule olivine.

Notes

Righter, K., Schutt, J., Lunning, N., Harvey, R., & Karner, J. (2021a) Identification and pairing reassessment of unequilibrated ordinary chondrites from four Antarctic dense collection areas. Meteoritics & Planetary Science 56, 1556-1578.

Antarctic Meteorite Images for Sample MET 96503

Lab Photo(s) :

Antarctic Meteorite Images for Sample MET 96503

Thin Section Photo(s) :

Thin Section Photo of Sample MET 96503 in Cross-Polarized Light with 2.5X Magnification

References for Sample MET96503

Kaplan, H.H., Connolly, H.C., Dotto, E., Emery, J.P., Fornasier, S., Lantz, C., Lim, L.F., Merlin, F., Praet, A., Reuter, D.C., Sanford, S.A., Hamilton, V.E., Simon, A.A., Takir, D., and Lauretta, D.S., Howell, E.S., Anderson, F.S., Barrucci, M.A., Brucato, J., Burbine, T.H., Clark, B.E., Cloutis, E.A., 2020, Visible-near infrared spectral indices for mapping mineralogy and chemistry with OSIRIS-Rex. , Meteoritics & Planetary Science, 55 , 744-765 , doi: 10.111/maps.13461.

Pape, J., Mezger, K., Bouvier, A. S., & Baumgartner, L. P., 2019, Time and duration of chondrule formation: Constraints from ²⁶Al-²⁶Mg ages of individual chondrules. , Geochimica et Cosmochimica Acta, 244 , 416-436 .

Telus, M., Huss, G. R., Ogliore, R. C., Nagashima, K., Howard, D. L., Newville, M. G., Tomkins, A. G., 2016, Mobility of iron and nickel at low temperatures: Implications for 60 Fe–60 Ni systematics of chondrules from unequilibrated ordinary chondrites. , Geochimica et Cosmochimica Acta, 178 , 87-105 .

Frank, D. R., Zolensky, M. E., Le, L., 2014, Olivine in terminal particles of Stardust aerogel tracks and analogous grains in chondrite matrix. , Geochimica et Cosmochimica Acta, 142 , 1-Oct-14 , 240-259 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2014.05.037 .

Quirico, E., Montagnac, G., Rouzaud, J. N., Bonal, L., Bourot-Denise, M., Duber, S., Reynard, B., 2009, Precursor and metamorphic condition effects on Raman spectra of poorly ordered carbonaceous matter in chondrites and coals. , Earth and Planetary Science Letters, 287 Issues 1-2 , 30-Sep-09 , 185-193 , ISSN 0012-821X , http://dx.doi.org/10.1016/j.epsl.2009.07.041 .

Wang, M. S., Lipschutz, M. E., 2007, Trace elements in primitive meteorites-VII Antarctic unequilibrated ordinary chondrites. , Geochimica et Cosmochimica Acta, 71 Issue 4 , 15-Feb-07 , 1062-1073 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2006.10.009 .

Grossman, J. N., Brearley, A. J., 2005, The onset of metamorphism in ordinary and carbonaceous chondrites. , Meteoritics & Planetary Science, 40 , 87-122 , http://dx.doi.org/10.1111/j.1945-5100.2005.tb00366.x .

Benoit, P. H., Akridge, G. A., Ninagawa, K., Sears, D. W. G., 2002, Thermoluminescence sensitivity and thermal history of type 3 ordinary chondrites: Eleven new type 3.0-3.1 chondrites and possible explanations for differences among H, L, and LL chondrites. , Meteoritics & Planetary Science, 37 , 793-805 .

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

Antarctic Meteorite Petrographic Description

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