Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

EET 96135

Newsletter

21,2

Location

Elephant Moraine

Field Number

10107

Dimensions (cm)

5.0 x 4.0 x 2.5

Weight (g)

95.66

Original Classification

EH4-5 Chondrite

Updated Classification

EH4/5 Chondrite

Pairing

EET 96135; EET 96202; EET 96217; EET 96223; EET 96299; EET 96309; EET 96341

Mineral Composition (%Fa & %Fs)

Ferrosilite (mol%): 0-1

Weathering

Fracturing

Macroscopic Description - Kathleen McBride, Carol Schwarz, Cecilia Satterwhite

These meteorites have brownish black polygonally fractured fusion crust with iridescent oxidation haloes present. All samples had fractures that penetrated the surface and are very friable. The interiors are steel gray to black, fine-grained, sugary textured, with metal grains visible. Rusty colored oxidation rind is present. Minor rust is present. These meteorites smell like sulfur and have very small light colored chondrules.

Thin Section Description (,2) - Tim McCoy

The sections consists of an aggregate of small chondrules (most less than 0.5 mm), chondrule fragments and pyroxene grains with metal, troilite, daubreelite and niningerite. Weathering is relatively minor. Enstatite is Fs_0.-1. One grain of free silica was analyzed and metal contains ~1.8 wt. % Si. The meteorite is an EH4-5 chondrite.

Reclassification Notes (AMN 31,1)

Reclassified as EH4/5 Chondrite in AMN 31,1.

Antarctic Meteorite Images for Sample EET 96135

Thin Section Photo(s) :

Thin Section Photo of Sample EET 96135 in Cross-Polarized Light

Thin Section Photo of Sample EET 96135 in Cross-Polarized Light with 2.5X Magnification

Thin Section Photo of Sample EET 96135 in Plane-Polarized Light

References for Sample EET96135

Hopp, J., Storck, J.C., Ludwig, T., Mostefaoui, S., Altherr, R., Ott, U., Meyer, H.P., Trieloff, M., 2021, ⁵³Mn-⁵³Cr systematics of sphalerite in enstatite chondrites , Geochimica et Cosmochimica Acta, 310 , 79–94 , https://doi.org/10.1016/j.gca.2021.07.011 .

Zhao, C., Lodders, K., Bloom, H., Chen, H., Tian, Z., Koefoed, P., Petö, M.K., and Wang, K., 2020, Potassium isotopic compositions of enstatite meteorites. , Meteoritics & Planetary Science, 55 , 1404–1417 , doi: 10.1111/maps.13358.

Barrat, J. A., Dauphas, N., Gillet, P., Bollinger, C, Etoubleau, J., Bischoff, A., Yamaguchi, A., 2016, Evidence from Tm anomalies for non-CI refractory lithophile element proportions in terrestrial planets and achondrites. , Geochimica et Cosmochimica Acta, 176 , 1-17 .

Hopp, J., Trieloff, M., Ott, U., 2016, I–Xe ages of enstatite chondrites. , Geochimica et Cosmochimica Acta, 174 , 196-210 .

Hopp, J., Trieloff, M., Ott, U., Korochantseva, E. V., Buykin, A. I., 2014, 39Ar-40Ar chronology of the enstatite chondrite parent bodies. , Meteoritics & Planetary Science, 49 , 358-372 .

Vernazza,. P., Brunetto, R., Lamy, P., Groussin, O., Hiroi, T., Jorda, L., King, P. L., Izawa, M.R. M., Marchis, F., Birlan, M., 2011, Asteroid (21) Lutetia as a remnant of Earth's precursor planetesimals. , Icarus, 216 Issue 2 , Dec-11 , 650-659 , ISSN 0019-1035 , http://dx.doi.org/10.1016/j.icarus.2011.09.032 .

Izawa, R. M., Flemming, R. L., Banerjee, N. R., Mccausland, J. A., 2011, Micro-X-ray diffraction assessment of shock stage in enstatite chondrites. , Meteoritics & Planetary Science, 46 , 638-651 , http://dx.doi.org/10.1111/j.1945-5100.2011.01180.x .

Losiak, A., Velbel, M. A., 2011, Evaporite formation during weathering of Antarctic meteorites--A weathering census analysis based on the ANSMET database. , Meteoritics & Planetary Science, 46 , 443-458 , http://dx.doi.org/10.1111/j.1945-5100.2010.01166.x .

Van Acken, D., Brandon, A. D., Humayun, M., 2011, High-precision osmium isotopes in enstatite and Rumuruti chondrites. , Geochimica et Cosmochimica Acta, 75 Issue 14 , 15-Jul-11 , 4020-4036 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2011.04.019 .

Izawa, R. M., King, P. L., Flemming, R. L., Peterson, R. C., Mccausland, P. J. A., 2010, Mineralogical and spectroscopic investigation of enstatite chondrites by X-ray diffraction and infrared reflectance spectroscopy. , Journal of Geophysical Research: Planets, 115 , E07008 , http://dx.doi.org/10.1029/2009JE003452 .

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 .

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 .

Patzer, A., Schultz, L., 2002, Noble gases in enstatite chondrites II: The trapped component. , Meteoritics & Planetary Science, 37 , 601-612 .

Patzer, A., Schultz, L., 2001, Noble gases in enstatite chondrites I: Exposure ages, pairing, and weathering effects. , Meteoritics & Planetary Science, 36 , 947-961 , http://dx.doi.org/10.1111/j.1945-5100 .

RELAB, , Reflectance Experiment Lab , catalogue of samples, .

Antarctic Meteorite Petrographic Description

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