Sample Petrographic Description
| Sample Number | MIL 07001 |
| Newsletter | 31,2 |
| Location | Miller Range |
| Field Number | 19101 |
| Dimensions (cm) | 11.0 x 9.0 x 8.5 |
| Weight (g) | 924.20 |
| Original Classification | Diogenite (Olivine) |
| Mineral Composition (%Fa & %Fs) | |
| Fayalite (mol%): 28;Ferrosilite (mol%): 23 | |
| Weathering | |
| A/B | |
| Fracturing | |
| A/B | |
| Macroscopic Description - Roger Harrington | |
| Dull black fusion crust covers 40% of this achondrite’s exterior. Approximately 40% of the exterior is a tan to medium olive green with a fine grained matrix. 20% is medium to light olive green with a coarse grained matrix. One 3 mm diameter dark mineral inclusion is present on the top north side. Cleavage planes are visible on the inclusion when viewed under a hand lens. The interior is a medium gray to orange tan fine grained matrix with less than 1% small (<1 mm) dark mineral inclusions. | |
| Thin Section Description (,7) - Tim McCoy, Linda Welzenbach | |
| The section is unbrecciated and is dominated by 0.5-1 mm equigranular orthopyroxene with abundant 120° triple junctions. Olivine occurs as rounded grains both interstitially to and poikilitically enclosed in the orthopyroxene. Opaques included oxides, troilite and metal. Orthopyroxene has a composition of Fs23 Wo2 and olivine is Fa28. The Fe/Mn ratio of the pyroxene is ~30. The meteorite is an olivine diogenite. | |
| Oxygen Isotopic Composition - Z. Sharp, University of New Mexico | |
| Oxygen isotopic analyses of two splits yielded the following results which fall in the HED meteorite field. All samples were cleaned in a 10% HCl solution for 1 minute, followed by ultrasonication. ?17O = 1.64,?18O = 3.80, ?17O = -0.33 |
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| Antarctic Meteorite Images for Sample MIL 07001 | ||||
| Field Photo(s) : | ||||
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| Field photo image(s) courtesy of the ANSMET (ANtarctic Search for METeorites) Program, Case Western Reserve University and the University of Utah | ||||
| Antarctic Meteorite Images for Sample MIL 07001 | ||||
| Lab Photo(s) : | ||||
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| Antarctic Meteorite Images for Sample MIL 07001 | ||||
| Thin Section Photo(s) : | ||||
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| References for Sample MIL07001 | |
| McCoy, T.J., 2015, Meteorite Misfits: Fuzzy Clues to Solar System Processes. In Righter, K., Corrigan, C.M., McCoy, T.J., and Harvey, R.P. Meteorites: A Pictorial Guide to the Collection, First Edition , AGU Wiley, , pp. 145-152 . | |
| Mittlefehldt, D. W., 2015, Asteroid (4) Vesta: I. The howardite-eucrite-diogenite (HED) clan of meteorites. , Chemie der Erde - Geochemistry, 75 Issue 2 , Jun-15 , 155-183 , ISSN 0009-2819 , http://dx.doi.org/10.1016/j.chemer.2014.08.002 . | |
| Tkalcec, B. J., Brenker, F. E., 2014, Plastic deformation of olivine-rich diogenites and implications for mantle processes on the diogenite parent body. , Meteoritics & Planetary Science, 49 , 1202-1213 . | |
| Greenwood, R. C., Barrat, J. A., Yamaguchi, A., Franchi, I. A., Scott, E. R., Bottke, W. F., Gibson, J. M., 2014, The oxygen isotope composition of diogenites: Evidence for early global melting on a single, compositionally diverse, HED parent body. , Earth and Planetary Science Letters, 390 , 165-174 . | |
| Day, J. M. D., Walker, R. J., Qin, L., Rumble III, D., 2012, Late accretion as a natural consequence of planetary growth. , Nature Geoscience, 5 , 614-617 , http://dx.doi.org/10.1038/ngeo1527 . | |
| Wang, K., Moynier, F., Dauphas, N., Barrat, J. A., Craddock, P., Sio, C. K., 2012, Iron isotope fractionation in planetary crusts. , Geochimica et Cosmochimica Acta, 89 , 15-Jul-12 , 31-45 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2012.04.050 . | |
| Paniello, R. C., Moynier, F., Beck, P., Barrat, J. A., Podosek, F. A., Pichat, S., 2012, Zinc isotopes in HEDs: Clues to the formation of 4-Vesta, and the unique composition of Pecora Escarpment 82502. , Geochimica et Cosmochimica Acta, 86 , 1-Jun-12 , 76-87 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2012.01.045 . | |
| Barrat, J. A., Yamaguchi, A., Zanda, B., Bollinger, C., Bohn, M., 2010, Relative chronology of crust formation on asteroid Vesta: Insights from the geochemistry of diogenites. , Geochimica et Cosmochimica Acta, 74 Issue 21 , 1-Nov-10 , 6218-6231 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2010.07.028 . | |
| RELAB, , Reflectance Experiment Lab , catalogue of samples, . | |