Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

LAR 04316

Newsletter

28,2

Location

Larkman Nunatak

Field Number

15577

Dimensions (cm)

12.0 x 7.0 x 7.0

Weight (g)

1163.00

Original Classification

Aubrite

Mineral Composition (%Fa & %Fs)

Fayalite (mol%): 2;Ferrosilite (mol%): 0-2

Weathering

Fracturing

A/B

Macroscopic Description - Kathleen McBride

Very little fusion crust is left on the exterior surface. The three areas of remaining crust are brown/black in color and have the characteristic bubbly appearance. There are some areas of yellow crusty material. The interior has a light gray matrix with large, angular white and gray clasts. Smaller clasts are usually white. There is a large 2.5 cm black clast with rust located in the center of the break. The interior contains multiple dark gray to almost black angular clasts with basaltic texture.

Thin Section Description (,3, 4, 7) - Tim McCoy

Section ,3 samples a comminuted matrix of essentially FeO-free enstatite (Fs_0-1) and diopside (Fs₁Wo₄₅) with grain sizes reaching 3 mm and rarer metal, phosphide, troilite, daubreelite and alabandite. This material makes up the bulk of the meteorite. Two clasts described in the macroscopic description, and apparently in contact in the piece, are an aubrite basalt vitrophyre of the type recently described by Fogel (GCA 69, 1633-1648) composed of enstatite (Fs₂) and forsterite (Fa₂) in a matrix of feldspathic glass and a metal-sulfide quench-textured clast with a single 0.5 mm alabandite grain. The meteorite is an aubrite.

Antarctic Meteorite Images for Sample LAR 04316

Field Photo(s) :

ANSMET LAR 04316 - Field Number: 15577, NASA Photo Number: jsc2019e009378

ANSMET LAR 04316 - Field Number: 15577, NASA Photo Number: jsc2019e009379

ANSMET LAR 04316 - Field Number: 15577, NASA Photo Number: jsc2019e009380

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 LAR 04316

Lab Photo(s) :

Lab Photo of Sample LAR 04316 Showing East View

Lab Photo of Sample LAR 04316 Showing North View

Lab Photo of Sample LAR 04316 Showing South View

Lab Photo of Sample LAR 04316 Showing West View

References for Sample LAR04316

Zhu, K., Moynier, F., Schiller, M., Becker, H., Barrat, J., and Bizzarro, M., 2021, Tracing the origin and core formation of the enstatite achondrite parent bodies using Cr isotopes. , Geochimica et Cosmochimica Acta, 308 , 256–272 , doi: 10.1016/j.gca.2021.05.053 .

Zhao, C., Lodders, K., Bloom, H., Chen, H., Tian, Z., Koefoed, P., Petö, M.K., and Wang, K., 2020, Potassium isotopic compositions of enstatite meteorites. , Meteoritics & Planetary Science, 55 , 1404–1417 , doi: 10.1111/maps.13358.

Barrat, J. A., Dauphas, N., Gillet, P., Bollinger, C, Etoubleau, J., Bischoff, A., Yamaguchi, A., 2016, Evidence from Tm anomalies for non-CI refractory lithophile element proportions in terrestrial planets and achondrites. , Geochimica et Cosmochimica Acta, 176 , 1-17 .

Barrat, J. A., Greenwood, R. C., Keil, K., Rouget, M. L., Boesenberg, J. S., Zanda, B., Franchi, I. A., 2016, The origin of aubrites: Evidence from lithophile trace element abundances and oxygen isotope compositions. , Geochimica et Cosmochimica Acta, 192 , 29-48 .

Rubin, A. E., 2015, Shock and annealing in aubrites: Implications for parent-body history. , Meteoritics & Planetary Science, 50 , 1217-1227 , http://dx.doi.org/10.1111/maps.12464 .

Van Acken, D., Brandon, A. D., Lapen, T. J., 2012, Highly siderophile element and osmium isotope evidence for postcore formation magmatic and impact processes on the aubrite parent body. , Meteoritics & Planetary Science, 47 , 1606-1623 , http://dx.doi.org/10.1111/j.1945-5100.2012.01425.x .

Keil, K., Mccoy, T. J., Wilson, L., Barrat, J. A., Rumble, D., Meier, M. M. M., Wieler, R., Huss, G. R., 2011, A composite Fe,Ni-FeS and enstatite-forsterite-diopside-glass vitrophyre clast in the Larkman Nunatak 04316 aubrite: Origin by pyroclastic volcanism. , Meteoritics & Planetary Science, 46 , 1719-1741 , http://dx.doi.org/10.1111/j.1945-5100.2011.01261.x .

Keil, K., 2010, Enstatite achondrite meteorites (aubrites) and the histories of their asteroidal parent bodies. , Chemie der Erde - Geochemistry, 70 Issue 4 , 2010 , 295-317 , ISSN 0009-2819 , http://dx.doi.org/10.1016/j.chemer.2010.02.002 .

Wilson, L., Keil, K., Mccoy, T. J., 2010, Pyroclast loss or retention during explosive volcanism on asteroids: Influence of asteroid size and gas content of melt. , Meteoritics & Planetary Science, 45 , 1284-1301 , http://dx.doi.org/10.1111/j.1945-5100.2010.01085.x .

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 .

, 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, .

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

Antarctic Meteorite Petrographic Description

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