Sample Petrographic Description
Sample Number | GRO 95658 |
Newsletter | 21,1 |
Location | Grosvenor Mountains |
Field Number | 9759 |
Dimensions (cm) | 3.0 x 3.0 x 5.0 |
Weight (g) | 57.62 |
Original Classification | LL3.3 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 6-28;Ferrosilite (mol%): 2-21 | |
Weathering | |
A/B | |
Fracturing | |
A | |
Macroscopic Description - Kathleen McBride | |
The exterior of this ordinary chondrite has dull black fusion crust over 60% of its surface. This fusion crust is striated and rough, with visible bubbles. The interior has a black matrix. Numerous, large (largest ~0.5 cm in diameter) tan and rust colored chondrules and metal grains are present. | |
Thin Section Description (,2) - Brian Mason | |
The section shows a close-packed aggregate of chondrules, chondrule fragments and irregular aggregates up to 1.8 mm across, in a small amount of black matrix which contains accessory nickel-iron and sulfide in minute grains. A variety of chondrules are present, including barred olivine, granular and porphyritic olivine and olivine-pyroxene, and radiating and cryptocrystalline pyroxene. Microprobe analyses show olivine and pyroxene of variable compositions; olivine, Fa6-28, mean Fa18; pyroxene, Fs2-21. The meteorite is tentatively classified as an LL3 chondrite (estimated LL3.3). |
Antarctic Meteorite Images for Sample GRO 95658 | ||||
Thin Section Photo(s) : | ||||
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References for Sample GRO95658 | |
Bonal, L., Quirico, E., Flandinet, L., Montagnac, G., 2016, Thermal history of type 3 chondrites from the Antarctic meteorite collection determined by Raman spectroscopy of their polyaromatic carbonaceous matter. Geochimica et Cosmochimica Acta, 189, 312-337. | |
Vernazza, P., and M. Lockhart , B. Zanda, R. P. Binzel, T. Hiroi, F. E. DeMeo, M. Birlan, R. Hewins, L. Ricci, P. Barge, 2014, Multiple and fast: The accretion of ordinary chondrite parent bodies. . The Astrophysical Journal , 791, 120-131, https://doi.org/10.1088/0004-637X/791/2/120. | |
Wang, M. S., Lipschutz, M. E., 2007, Trace elements in primitive meteorites-VII Antarctic unequilibrated ordinary chondrites. Geochimica et Cosmochimica Acta, 71 Issue 4, 15-Feb-07, 1062-1073, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2006.10.009. | |
Menzies, O. N., Bland, P. A., Berry, F. J., Cressey, G., 2005, A M”ssbauer spectroscopy and X-ray diffraction study of ordinary chondrites: Quantification of modal mineralogy and implications for redox conditions during metamorphism. Meteoritics & Planetary Science, 40, 1023-1042, http://dx.doi.org/10.1111/j.1945-5100.2005.tb00171.x. | |
Dixon, E. T., Bogard, D. D., Garrison, D. H., Rubin, A. E., 2004, 39Ar-40Ar evidence for early impact events on the LL parent body. Geochimica et Cosmochimica Acta, 68 Issue 18, 15-Sep-04, 3779-3790, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2004.02.023. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |