Sample Petrographic Description
Sample Number | ALH 81031 |
Newsletter | 6,1 |
Location | Allan Hills |
Field Number | 1675 |
Dimensions (cm) | 13.0 x 9.0 x 9.0 |
Weight (g) | 1594.90 |
Original Classification | LL3 Chondrite |
Updated Classification | L3.4 Chondrite |
Pairing | ALH 77011; ALH 77015; ALH 77031; ALH 77033; ALH 77034; ALH 77036; ALH 77043; ALH 77047; ALH 77049; ALH 77050; ALH 77052; ALH 77115; ALH 77140; ALH 77160; ALH 77163; ALH 77164; ALH 77165; ALH 77166; ALH 77167; ALH 77170; ALH 77175; ALH 77178; ALH 77185; ALH 77211; ALH 77214; ALH 77241; ALH 77244; ALH 77249; ALH 77260; ALH 77303; ALH 78013; ALH 78015; ALH 78017; ALH 78037; ALH 78038; ALH 78041; ALH 78162; ALH 78170; ALH 78176; ALH 78180; ALH 78186; ALH 78188; ALH 78235; ALH 78236; ALH 78238; ALH 78239; ALH 78243; ALH 79001; ALH 79045; ALH 80133; ALH 81025; ALH 81030; ALH 81031; ALH 81032; ALH 81053; ALH 81060; ALH 81061; ALH 81065; ALH 81066; ALH 81069; ALH 81085; ALH 81087; ALH 81121; ALH 81145; ALH 81156; ALH 81162; ALH 81190; ALH 81191; ALH 81214; ALH 81229; ALH 81243; ALH 81259; ALH 81272; ALH 81280; ALH 81292; ALH 81299; ALH 83038; ALH 85155; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 1-43;Ferrosilite (mol%): 3-35 | |
Weathering | |
C | |
Fracturing | |
B/C | |
Macroscopic Description - Carol Schwarz | |
This angular specimen has only small patches of fusion crust remaining on its weathered surface. Many large fractures penetrate the stone. A piece fell off in handling to reveal a totally weathered interior. | |
Thin Section Description - Brian Mason | |
This specimen closely resembles ALH 81025 in texture, range of mineral compositions, and degree of weathering. It is therefore classified as an LL3 chondrite and tentatively paired with that meteorite. | |
Reclassification Notes (AMN OUTSIDE) | |
Classification updated in Meteoritical Bulletin 76. |
Antarctic Meteorite Images for Sample ALH 81031 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample ALH 81031 | ||||
Thin Section Photo(s) : | ||||
References for Sample ALH81031 | |
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. | |
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. | |
Sears, D. W. G., Hasan, F. A., Batchelor, J. D., Lu, J., 1991, Chemical and physical studies of type 3 chondrites. XI-Metamorphism, pairing, and brecciation of ordinary chondrites. Proceedings Lunar and Planetary Science Conference, 21, 493-512. | |
Schultz, L., Kruse, H., 1989, Helium, neon, and argon in meteorites—A data compilation. Meteoritics, 24, 155-172. | |
Sears, D. W., Hasan, F. A., 1987, The type three ordinary chondrities: A review. Surveys in geophysics, 9(1), 43-97. | |
Sears, D. W. G., Weeks, K. S., 1986, Chemical and physical studies of type 3 chondrites—VI: Siderophile elements in ordinary chondrites. Geochimica et Cosmochimica Acta, 50 Issue 12, Dec-86, 2815-2832, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(86)90229-2. | |
Marvin, U. B., Mason, B., 1984, Field and laboratory investigations of meteorites from Victoria Land, Antarctica. Smithsonian Contributions to the Earth Sciences Number, 26, 134. |