Sample Petrographic Description
Sample Number | ALH 83102 |
Newsletter | 8,1 |
Location | Allan Hills |
Field Number | 2123 |
Dimensions (cm) | 12.0 x 9.0 x 9.0; 7.5 x 7.5 x 5.0 |
Weight (g) | 1786.17 |
Original Classification | C2 Chondrite |
Updated Classification | CM1/2 Chondrite |
Pairing | ALH 83100; ALH 83102; ALH 83106; ALH 84029; ALH 84030; ALH 84031; ALH 84032; ALH 84034; ALH 84035; ALH 84040; ALH 84041; ALH 84042; ALH 84043; ALH 84044; ALH 84045; ALH 84047; ALH 84048; ALH 84049; ALH 84051; ALH 85004; ALH 85106; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 0-2 | |
Weathering | |
B/Ce | |
Fracturing | |
C | |
Macroscopic Description - Roberta Score | |
ALH83102 consists of 20 or more pieces--only two of the larger pieces have been examined to date. Both pieces are extensively fractured and extremely friable. A small area of fusion crust is present. White evaporite deposit is present on both interior and exterior surfaces. Matrix ranges in color from greenish-black to black and contains small white inclusions. Areas of heavy oxidation were noted. | |
Thin Section Description - Glenn MacPherson | |
These two meteorite fragments are identical and probably paired. The specimens are intensely altered: matrix, inclusions and chondrules are almost completely replaced by iron-rich phyllosilicates, calcite, and iron oxides. The matrix is opaque and black except where the sections are unusually thin. Olivine grains are sporadically preserved, and are mostly Fa0-2, although some range down to Fa42. One small spinel-rich refractory spherule was found, in which the spinel is nearly pure MgAl2O4. No other primary phases were found in this spherule. These meteorites are probably fragments of one C2 carbonaceous chondrite. They are probably paired with ALH83100. | |
Reclassification Notes (AMN 45,2) | |
ALH 83102 has similar appearance, location, cosmic ray exposure age, and volatile element (H, C, N) composition to ALH 83100 and so they are paired. |
Antarctic Meteorite Images for Sample ALH 83102 | ||||
Lab Photo(s) : | ||||
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Antarctic Meteorite Images for Sample ALH 83102 | ||||
Thin Section Photo(s) : | ||||
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References for Sample ALH83102 | |
Bates, H.C., Donaldson Hanna, K.L., King, A.J., Bowles, N.E., and Russell, S.S., 2021, A spectral investigation of aqueously and thermally altered CM, CM-AN, and CY chondrites under simulated asteroid conditions for comparison with OSIRIS-REx and Hayabusa2 observations. Journal of Geophysical Research: Planets, 126, e2021JE006827, https://doi.org/10.1029/2021JE006827. | |
Velbel, M.A., and Zolensky, M.E., 2021, Thermal metamorphism of CM chondrites: A dehydroxylation-based peak temperature thermometer and implications for sample return from asteroids Ryugu and Bennu. Meteoritics & Planetary Science, 56, 546–585, doi: 10.1111/maps.13636. | |
Cooper, G., Rios, A. C., 2016, Enantiomer excesses of rare and common sugar derivatives in carbonaceous meteorites. Proceedings of the National Academy of Sciences, 113(24), E3322-E3331. | |
Cooper, G., Reed, C., Nguyen, D., Carter, M., Wang, Y., 2011, Detection and formation scenario of citric acid, pyruvic acid, and other possible metabolism precursors in carbonaceous meteorites. PNAS, 108 (34), 2011, 14015-14020, http://dx.doi.org/10.1073/pnas.1105715108. | |
Nazarov, M. A., Kurat, G., Brandstaetter, F., Ntaflos, T., Chaussidon, M., Hoppe, P., 2009, Phosphorus-bearing sulfides and their associations in CM chondrites. Petrology, 17(2), 101-123. | |
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. | |
Jull, A. J. T., Cloudt, S., Cielaszyk, E., 1998, . 14C terrestrial ages of meteorites from Victoria Land, Antarctica, and the infall rates of meteorites. Geological Society, London, Special Publications, 140(1), 75-91. | |
Salisbury, J. W., D'Aria, D. M., Jarosewich, E., 1991, Midinfrared (2.5–13.5 µm) reflectance spectra of powdered stony meteorites. Icarus, 92 Issue 2, Aug-91, 280-297, ISSN 0019-1035, http://dx.doi.org/10.1016/0019-1035(91)90052-U. | |
Jarosewich, E., 1990, Chemical analyses of meteorites: A compilation of stony and iron meteorite analyses. Meteoritics, 25, 323-337. | |
Marvin, U. B., MacPherson, G. J., 1989, Field and Laboratory Investigations of Meteorites from Victoria Land and the Thiel Mountains Region, Antarctica 1982-1983 and 1983-1984. Smithsonian Contributions to the Earth Sciences Number, 28, 146. | |
Schultz, L., Kruse, H., 1989, Helium, neon, and argon in meteorites—A data compilation. Meteoritics, 24, 155-172. |