Sample Petrographic Description
Sample Number | EET 96010 |
Newsletter | 21,1 |
Location | Elephant Moraine |
Field Number | 9697 |
Dimensions (cm) | 2.5 x 2.5 x 2.0 |
Weight (g) | 16.33 |
Original Classification | CV3 Chondrite |
Updated Classification | CM2 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 2-33;Ferrosilite (mol%): 1-3 | |
Weathering | |
B | |
Fracturing | |
A | |
Macroscopic Description - Kathleen McBride | |
The exterior of this carbonaceous chondrite is black with light colored chondrules. Only small patches of purplish fusion crust remain. It is pitted and has a rough texture. The matrix is black with light colored chondrules, mm in size. It is very soft and chondrules fall out easily or break. There are some areas of rust but the amount of metal seems minor. | |
Thin Section Description (,5) - Brian Mason | |
The section shows numerous chondrules and chondrule fragments, up to 3 mm across, in a black matrix. Trace amounts of nickel-iron and sulfide are present as minute grains dispersed through the matrix. Microprobe analyses show that most of the chondritic olivine is close to Mg2SiO4 in composition, with some more iron-rich grains; pyroxene composition is Fs1-3. The matrix appears to consist largely of iron-rich olivine, around Fa45. The meteorite is a C3 chondrite of the Vigarano subtype. | |
Reclassification Notes (AMN 33,1) | |
Original classification in AMN 21, no. 1 as an CV3 chondrite, but several studies have brought information to light that is inconsistent with that classification. Oxygen isotope data ([1] Clayton and Mayeda, 2003), as well as magnetic susceptibility data ( [2] Rochette et al., 2008) and bulk compositional data ([3] Moriarty et al., 2009; [4,5] Tonui et al., 2001, 2002) indicate this meteorite is not an CV3 chondrite, but a CM2 chondrite, and one with extensive hydration like Belgica 7904. References:
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Antarctic Meteorite Images for Sample EET 96010 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample EET 96010 | ||||
Thin Section Photo(s) : | ||||
References for Sample EET96010 | |
Cloutis, E. A., Hudon, P., Hiroi, T., Gaffey, M. J., 2012, Spectral reflectance properties of carbonaceous chondrites 4: Aqueously altered and thermally metamorphosed meteorites. Icarus, 220 Issue 2, Aug-12, 586-617, ISSN 0019-1035, http://dx.doi.org/10.1016/j.icarus.2012.05.018. | |
Moriarty, G. M., Rumble III, D., Friedrich, J. M., 2009, Compositions of four unusual CM or CM-related Antarctic chondrites. Chemie der Erde - Geochemistry, 69 Issue 2, Jun-09, 161-168, ISSN 0009-2819, http://dx.doi.org/10.1016/j.chemer.2008.12.002. | |
Rochette, P., Kohout, T., Pesonen, L., Quirico, E., Sagnotti, L., Skripnik, A., Gattacceca, J., Bonal, L., Bourot-Denise, M., Chevrier, V., Clerc, J. P., Consolmagno, G., Folco, L., Gounelle, M., 2008, Magnetic classification of stony meteorites: 2. Non-ordinary chondrites. Meteoritics & Planetary Science, 43, 959-980, http://dx.doi.org/10.1111/j.1945-5100.2008.tb01092.x. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |