Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

MET 00526

Newsletter

25,2

Location

Meteorite Hills

Field Number

13507

Dimensions (cm)

7.0 x 4.0 x 3.5

Weight (g)

208.20

Original Classification

H3.2 Chondrite

Updated Classification

L(LL)3.05 Chondrite

Pairing

MET 00452; MET 00526; MET 00621

Mineral Composition (%Fa & %Fs)

Fayalite (mol%): 1-19;Ferrosilite (mol%): 3-28

Weathering

B/C

Fracturing

Macroscopic Description - Kathleen McBride

The exterior has very thin black-gray fusion crust with chondrules visible through crust. The interior is composed of a black matrix, with inclusions ranging in size from 3-4 mm and mm-sized chondrules. Chondrules are rust colored and the inclusions are a slightly lighter shade. The meteorite is relatively hard.

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

The section exhibits numerous small, well-defined chondrules (up to 1.5 mm) in a black matrix of fine-grained silicates, metal and troilite. Weak shock effects are present. Polysynthetically twinned pyroxene is extremely abundant. The meteorite is relatively weathered. Silicates are unequilibrated; olivines range from Fa_1-19 and pyroxenes from Fs_3-28. The meteorite is an H3 chondrite (estimated subtype <3.2).

Reclassification Notes (AMN 33,1)

Reclassified as an L(LL)3.05 Chondrite [Grossman, J.N. and Brearley, A., (2005) MaPS 40, 87-122.

Notes

Paired with MET 00452 based on Metsoc poster from 2015 meeting; Righter, K.; Satterwhite, C. E.; Schutt, J. (2015) Updates on Pairing Issues with the US Antarctic Meteorite Collection. 78th Annual Meeting of the Meteoritical Society, held July 27-31, 2015 in Berkeley, California. LPI Contribution No. 1856, abstract #5266. 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 00526

Field Photo(s) :

ANSMET MET 00526 - Field Number: 13507, NASA Photo Number: jsc2018e094471

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

References for Sample MET00526

Pape, J., Rose´n, A.V., Mezger, K., and Guillong, M., 2021, Primary crystallization and partial remelting of chondrules in the protoplanetary disk: Petrographic, mineralogical and chemical constraints recorded in zoned type-I chondrules. , Geochimica et Cosmochimica Acta, 292 , 499–517 , https://doi.org/10.1016/j.gca.2020.10.019 .

Righter, K., Schutt, J., Lunning, N., Harvey, R, and Karner, J., 2021, Identification and pairing reassessment of unequilibrated ordinary chondrites from four Antarctic dense collection areas. , Meteoritics & Planetary Science, 56 , 1556-1573 , doi: 10.1111/maps.13707 .

Bloom, H., Lodders, K., Chen, H., Zhao, C., Tian, Z., Koefoed, P., Petö, M.K., Jiang, J., and Wang, K., 2020, Potassium isotope compositions of carbonaceous and ordinary chondrites: Implications on the origin of volatile depletion in the early solar system. , Geochimica et Cosmochimica Acta, 277 , 111–131 .

Dobrica, E., and Brearley, A.J., 2020, Iron-rich olivine in the unequilibrated ordinary chondrite MET 00526: Earliest stages of formation , Meteoritics & Planetary Science, 55 , 2652–2669 , doi: 10.1111/maps.13610 .

Barosch, J., Hezel, D. C., Ebel, D. S., & Friend, P., 2019, Mineralogically zoned chondrules in ordinary chondrites as evidence for open system chondrule behaviour. , Geochimica et Cosmochimica Acta, 249 , 16-Jan .

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 .

Bonal, L., Quirico, E., Flandinet, L., Montagnac, G., 2016, Thermal history of type 3 chondrites from the Antarctic meteorite collection determined by Raman spectroscopy of their polyaromatic carbonaceous matter. , Geochimica et Cosmochimica Acta, 189 , 312-337 .

Dobrică, E., Brearley, A. J., 2016, Microchondrules in two unequilibrated ordinary chondrites: Evidence for formation by splattering from chondrules during stochastic collisions in the solar nebula. , Meteoritics & Planetary Science, 51(5) , 884-905 .

Weisberg, M.K., and Righter, K., 2015, Primitive Asteroids: Expanding the Range of Known Primitive Materials. In Righter, K., Corrigan, C.M., McCoy, T.J., and Harvey, R.P. Meteorites: A Pictorial Guide to the Collection, First Edition , AGU Wiley, , pp. 65-77 .

Berlin, J., Jones, R. H., Brearley, A. J., 2011, Fe-Mn systematics of type IIA chondrules in unequilibrated CO, CR, and ordinary chondrites. , Meteoritics & Planetary Science, 46 , 513-533 , http://dx.doi.org/10.1111/j.1945-5100.2011.01171.x .

Aleon, J., 2010, Multiple origins of nitrogen isotopic anomalies in meteorites and comets. , The Astrophysical Journal, 722 , 1342–1351 , doi:10.1088/0004-637X/722/2/1342 .

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 .

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 .

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 .

Antarctic Meteorite Petrographic Description

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