Sample Petrographic Description
Sample Number | ALH 84011 |
Newsletter | 9,4 |
Location | Allan Hills |
Field Number | 1459 |
Dimensions (cm) | 7.5 x 5.0 x 4.0 |
Weight (g) | 138.20 |
Original Classification | Aubrite |
Pairing | ALH 83009; ALH 83015; ALH 84007; ALH 84008; ALH 84009; ALH 84010; ALH 84011; ALH 84012; ALH 84013; ALH 84014; ALH 84015; ALH 84016; ALH 84017; ALH 84018; ALH 84019; ALH 84020; ALH 84021; ALH 84023; ALH 84024; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 0;Ferrosilite (mol%): 0 | |
Weathering | |
A | |
Fracturing | |
A/B | |
Macroscopic Description - Carol Schwarz | |
This fragment is a complex breccia consisting of large white clasts; the largest is 2 cm in diameter. Other clasts range from 1 mm and greater. The "N" face shows a contact between dark glassy(?) matrix with white clasts and a white brecciated area of white clasts with small dark inclusions, sometimes rusty. There are also several dark inclusions up to 5 mm in diameter. A small amount of yellowish fusion crust(?) is present on one exterior surface. The thin section chip has both the light and dark areas. | |
Thin Section Description (,4) - Glenn MacPherson | |
This very coarse-grained aubrite shows only local effects of weathering in the vicinity of metal grains. Enstatite (FeO <0.1%) occurs as intensely strained crystals up to 5 mm in length that are set in a highly brecciated and granulated matrix. The matrix is composed of enstatite plus an assemblage of troilite, kamacite, schreibersite, daubreelite, and alabandite. Rare veins of presumably shock-produced brown, isotropic glass occur and exhibit a swirled texture with numerous tiny globules of sulfide(?). |
Antarctic Meteorite Images for Sample ALH 84011 | ||||
Lab Photo(s) : | ||||
![]() |
![]() |
![]() |
![]() |
|
![]() |
![]() |
![]() |
![]() |
|
![]() |
![]() |
![]() |
![]() |
|
![]() |
Antarctic Meteorite Images for Sample ALH 84011 | ||||
Thin Section Photo(s) : | ||||
![]() |
![]() |
References for Sample ALH84011 | |
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. | |
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. | |
Schultz, L., Franke, L., 2004, Helium, neon, and argon in meteorites: A data collection. Meteoritics & Planetary Science, 39, 1889-1890, http://dx.doi.org/10.1111/j.1945-5100.2004.tb00083.x. | |
Lorenzetti, S., Eugster, O., Busemann, H., Marti, K., Burbine, T. H., Mccoy, T., 2003, History and origin of aubrites. Geochimica et Cosmochimica Acta, 67 Issue 3, 1-Feb-03, 557-571, ISSN 0016-7037, http://dx.doi.org/10.1016/S0016-7037(02)01085-2. | |
Benoit, P. H., Sears, D. W. G., Akridge, J. M. C., Bland, P. A., Berry, F. J., Pillinger, C. T., 2000, The non-trivial problem of meteorite pairing. Meteoritics & Planetary Science, 35, 393-417. | |
Herpers, U., Vogt, S., Bremer, K., Hofmann, H. J., Suter, M., Wieler, R., Lange, H. J., Michel, R., 1995, Cosmogenic nuclides in differentiated antarctic meteorites: measurements and model calculations. Planetary and Space Science, 43 Issues 3-4, March-April 1995, 545-556, ISSN 0032-0633, http://dx.doi.org/10.1016/0032-0633(94)00191-S. | |
Casanova, I., Keil, K., Newsom, H. E., 1993, Composition of metal in aubrites: Constraints on core formation. Geochimica et Cosmochimica Acta, 57 Issue 3, Feb-93, 675-682, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(93)90377-9. | |
Marvin, U. B., MacPherson, G. J., 1992, Field and Laboratory Investigations of Antarctica Meteorites Collected by United States Expeditions, Smithsonian Contributions to the Earth Sciences Number, 30, 116. |