Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

EET 79001

Newsletter

7,1

Location

Elephant Moraine

Field Number

1043

Dimensions (cm)

22.0 x 17.0 x 14.0

Weight (g)

7942.00

Original Classification

Shergottite

Mineral Composition (%Fa & %Fs)

Fayalite (mol%): 23-27;Ferrosilite (mol%): 16-67

Weathering

Fracturing

Macroscopic Description - Roberta Score

All but one surface of this achondrite (22 x 17 x 14 cm.) is covered with black fusion crust, but there are areas on all surfaces where the fusion crust has been plucked away. One surface has a deep regmaglypt that is covered with fusion crust. The areas devoid of fusion crust are white-gray in color and the matrix appears porous. Veins (~ 0.5 mm wide) of dark material criss-cross each other. Whitish-yellow clasts (Grimm diameter) are scattered all over this achondrite. Most of the specimen appears very fine-grained but a small part near the E surface has a different lithology.

Sawing this meteorite exposed a light colored interior with rounded white clasts, as large as 0.5 cm in diameter. Several large black fine-grained clasts as large as 2.5 cm are scattered over the cut face. Some of these black clasts contain glass lined vugs. Upon chipping one of these clasts containing a vug, the entire clast popped out easily with no matrix adhering to the clast. Numerous veins of black material criss-cross each other. Most of these veins run through a black clast. The longest vein is 14 cm long. Near the W end of the cut face are brownish colored clasts which may or may not be pyroxene. Ninety percent of the cut face is fine-grained. Ten percent (near the E end) of the cut face consists of intergrown pyroxene and feldspar in a basaltic texture.

Thin Section Description - Arch Reid

Thin sections were cut from the three different lithologies: 1) the main mass of the meteorite; 2) the material with basaltic texture that is present at one end of the sample, and; 3) the dark clasts included in the main mass.

The main mass is a shocked but unbrecciated pyroxenite with pyroxene as the major phase but also containing maskelynite, Mg-Al chromite, iron sulphide and ilmenite(?). The major pyroxene is polysynthetically twinned pigeonite (?) (resembling twinned clinobronzite) ranging in composition from Wo₅En₇₀Fs₂₅ to Wo₁₂En₅₀Fs₃₈. Orthopyroxene forms the cores of larger pyroxene grains and ranges in composition from Wo_1.5 En₈₃Fs₁₆ to Wo₃En₇₈Fs₁₉. The larger pyroxene grains, up to 3.5 mm, comprise untwinned cores zoned outward to polysynthetically twinned rims. The smaller pyroxenes, .3 to 1 mm, are twinned clinopyroxenes and are intergrown with maskelynite laths. The maskelynite ranges in composition from Or₁Ab₃₉An₆₀ to Or_1.5Ab₄₄An₅₅. A few large olivines, Fo₇₇ to Fo₇₃ range up to 2.5 mm.

The less abundant lithology closely resembles Shergotty in texture but is finer grained. The major minerals are clinopyroxene and maskelynite: calcium phosphate, SiO₂, ilmenite (?) and magnetite (?) are also present. Elongate clinopyroxene and laths of maskelynite are about one mm long and generally subparallel: many of the maskelynite grains contain pyroxene inclusions. Analyzed pigeonites range from Wo₁₀En₅₂Fs₃₈ to Wo₁₈En₁₅Fs₆₇. The maskelynite also shows a range in composition from Or_.5Ab₃₈An₆₂ to Or₄Ab₅₀An₄₆.

The dark clasts are apparently loci of melting; in many cases they connect with the thin black glassy (?) veinlets that traverse much of the meteorite. Thin sections from these dark areas show glass (with relict olivine, pyroxene and maskelynite inclusions), devitrified glass, areas with mosaic texture and vesicular areas with quench textures. The dark areas appear to be more common in olivine-bearing portions of the main mass.

Astromaterials 3D Link(s)

https://ares.jsc.nasa.gov/astromaterials3d/sample-details.htm?sample=EET79001-312
https://ares.jsc.nasa.gov/astromaterials3d/sample-details.htm?sample=EET79001-2

Antarctic Meteorite Images for Sample EET 79001

Field Photo(s) :

ANSMET EET 79001 - Field Number: 1043, NASA Photo Number: sc2018e084982

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 EET 79001

Lab Photo(s) :

Bottom View of Sawed Face of Sample EETA79001

Bottom View of Splits from Sample EETA79001

Bottom View of Splits from Sample EETA79001,2

Close-Up East View of Sample EETA79001,22

Close-Up View of Sawed Face of Sample EETA79001,1

Close-Up View of Sawed Face of Sample EETA79001,2

Cutting Plan View of Sample EETA79001,312

East View of Sample EETA79001,2 After Cutting

East View of Sample Splits from EETA79001,2

East View of Split from Sample EETA79001,2

East View of Splits from Sample EETA79001

Lab Photo of Sample EET 79001 Displaying South Orientation

North View of Chip from Sample EETA79001,2

North View of Chips from Sample EETA79001,2

North View of Sawed Face of Sample EETA79001

North View of Sawed Face of Sample EETA79001,2

North View of Splits from Sample EETA79001,2

Sample EETA79001 Being Processed in the Lab

South View Showing Original Placement of Splits from Sample EETA79001,2

South View of Sample Splits from EETA79001,2

South View of Sawed Face of Sample EETA79001,2

South View of Splits from Sample EETA79001,2

Antarctic Meteorite Images for Sample EET 79001

Thin Section Photo(s) :

Thin Section Photograph of Sample EETA79001 in Cross-Polarized Light

Thin Section Photograph of Sample EETA79001 in Plane-Polarized Light

Thin Section Photograph of Sample EETA79001 in Reflected Light

References for Sample EET79001

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Wiens, C. R. C., 1988, Noble gases released by vacuum crushing of EETA 79001 glass. Earth and Planetary Science Letters, 91 Issues 1-2, Dec-88, 55-65, ISSN 0012-821X, http://dx.doi.org/10.1016/0012-821X(88)90150-1.

Jull, A. J. T., Donahue, D. J., 1988, Terrestrial 14C age of the Antarctic shergottite, EETA 79001. Geochimica et Cosmochimica Acta, 52 Issue 5, May-88, 1309-1311, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(88)90285-2.

Gooding, J. L., Wentworth, S. J., Zolensky, M. E., 1988, Calcium carbonate and sulfate of possible extraterrestrial origin in the EETA 79001 meteorite. Geochimica et Cosmochimica Acta, 52 Issue 4, Apr-88, 909-915, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(88)90361-4.

Wright, I. P., Grady, M. M., Pillinger, C. T., 1988, Carbon, oxygen and nitrogen isotopic compositions of possible martian weathering products in EETA 79001. Geochimica et Cosmochimica Acta, 52 Issue 4, Apr-88, 917-924, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(88)90362-6.

Clayton, R. N., Mayeda, T. K., 1988, Isotopic composition of carbonate in EETA 79001 and its relation to parent body volatiles. Geochimica et Cosmochimica Acta, 52 Issue 4, Apr-88, 925-927, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(88)90363-8.

Wiens, C. R. C., Pepin, O. R. O., 1988, Laboratory shock emplacement of noble gases, nitrogen, and carbon dioxide into basalt, and implications for trapped gases in shergottite EETA 79001. Geochimica et Cosmochimica Acta, 52 Issue 2, Feb-88, 295-307, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(88)90085-3.

Laul, J. C., 1987, Rare earth patterns in shergottite phosphates and residues. Journal of Geophysical Research: Solid Earth, 92, E633-E640, http://dx.doi.org/10.1029/JB092iB04p0E633.

Jovanovic, S., Reed, G. W., 1987, Isotopically anomalous 196Hg and 202Hg in Antarctic achondrites. Geophysical Research Letters, 14(11), 1127-1130.

Bogard, D. D., Horz, F., Johnson, P. H., 1986, Shock-Implanted Noble Gases: an Experimental Study with Implications for the Origin of Martian Gases in Shergottite Meteorites. Lunar and Planetary Science Conference Proceedings, 17, 99-114.

Wiens, C. R. C., Becker, R. H., Pepin, O. R. O., 1986, The case for a martian origin of the shergottites, II. Trapped and indigenous gas components in EETA 79001 glass. Earth and Planetary Science Letters, 77 Issue 2, Mar-86, 149-158, ISSN 0012-821X, http://dx.doi.org/10.1016/0012-821X(86)90156-1.

Collinson, D. W., 1986, Magnetic properties of Antarctic shergottite meteorites EETA 79001 and ALHA 77005: possible relevance to a Martian magnetic field. Earth and Planetary Science Letters, 77 Issue 2, Mar-86, 159-164, ISSN 0012-821X, http://dx.doi.org/10.1016/0012-821X(86)90157-3.

Pal, D. K., Tuniz, C., Moniot, R. K., Savin, W., Kruse, T., Herzog, G. F., 1986, Beryllium-10 contents of shergottites, nakhlites, and Chassigny. Geochimica et Cosmochimica Acta, 50 Issue 11, Nov-86, 2405-2409, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(86)90022-0.

Gooding, J. L., 1986, Clay-mineraloid weathering products in Antarctic meteorites. Geochimica et Cosmochimica Acta, 50 Issue 10, Oct-86, 2215-2223, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(86)90076-1.

Laul, J. C., Verkouteren, R. M., Smith, M. R., Wanke, H., Jagoutz, E., Dreibus, G., Palme, H., Spettel, B., Burghele, A., Lipschutz, M. E., 1986, Chemical systematics of the shergotty meteorite and the composition of its parent body (Mars). Geochimica et Cosmochimica Acta, 50 Issue 6, Jun-86, 909-926, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(86)90373-X.

Jones, J. H., 1986, A discussion of isotopic systematics and mineral zoning in the shergottites: Evidence for a 180 m.y. igneous crystallization age. Geochimica et Cosmochimica Acta, 50 Issue 6, Jun-86, 969-977, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(86)90377-7.

Wright, I. P., Carr, R. H., Pillinger, C. T., 1986, Carbon abundance and isotopic studies of Shergotty and other shergottite meteorites. Geochimica et Cosmochimica Acta, 50 Issue 6, Jun-86, 983-991, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(86)90379-0.

Swindle, T. D., Caffee, M. W., Hohenberg, C. M., 1986, Xenon and other noble gases in shergottites. Geochimica et Cosmochimica Acta, 50 Issue 6, Jun-86, 1001-1015, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(86)90381-9.

Nishiizumi, K., Klein, J., Middleton, R., Elmore, D., Kubik, P. W., Arnold, J. R., 1986, Exposure history of shergottites. Geochimica et Cosmochimica Acta, 50 Issue 6, Jun-86, 1017-1021, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(86)90382-0.

Bhandari, N., Goswami, J. N., Jha, R., Sengupta, D., Shukla, P. N., 1986, Cosmogenic effects in shergottites. Geochimica et Cosmochimica Acta, 50 Issue 6, Jun-86, 1023-1030, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(86)90383-2.

Hasan, F. A., Haq, M., Sears, D. W. G., 1986, Thermoluminescence and the shock and reheating history of meteorites—III: The shergottites. Geochimica et Cosmochimica Acta, 50 Issue 6, Jun-86, 1031-1038, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(86)90384-4.

Rajan, R. S., Lugmair, G., Tamhane, A. S., Poupeau, G., 1986, Nuclear tracks, Sm isotopes and neutron capture effects in the Elephant Morraine shergottite. Geochimica et Cosmochimica Acta, 50 Issue 6, Jun-86, 1039-1042, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(86)90385-6.

Cisowski, S. M., 1986, Magnetic studies on Shergotty and other SNC meteorites. Geochimica et Cosmochimica Acta, 50 Issue 6, Jun-86, 1043-1048, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(86)90386-8.

Gooding, J. L., Muenow, D. W., 1986, Martian volatiles in shergottite EETA 79001: New evidence from oxidized sulfur and sulfur-rich aluminosilicates. Geochimica et Cosmochimica Acta, 50 Issue 6, Jun-86, 1049-1059, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(86)90387-X.

Carr, R. H., Grady, M. M., Wright, I. P., Pillinger, C. T., 1985, Martian atmospheric carbon dioxide and weathering products in SNC meteorites. Nature, 314(6008), 248-250.

Ott, U., Begemann, F, 1985, Are all the 'martian' meteorites from Mars?. Nature, 317, 509-512.

Carr, R. H., Wright, I. P., Pillinger, C. T., 1985, Carbon isotopes in three SNC meteorites. Journal of Geophysical Research: Solid Earth, 90, C664-C668, http://dx.doi.org/10.1029/JB090iS02p0C664.

Mcsween, H. Y., 1985, SNC Meteorites: Clues to Martian petrologic evolution?. Reviews of Geophysics, 23(4), 391-416.

Gibson, E. K., Moore, C. B., Primus, T. M., Lewis, C. F., 1985, SULFUR IN ACHONDRITIC METEORITES. Meteoritics, 20, 503-511.

Sarafin, R., Wölflii, W., Herpers, U., Signer, P., Wieler, R., Bonani, G., Hofmann, H. J., Morenzoni, E., Nessi, M., Suter, M., 1985, 10Be,26Al,53Mn, and light noble gases in the Antarctic shergottite EETA 79001 (A). Earth and Planetary Science Letters, 75 Issue 1, Sep-85, 72-76, ISSN 0012-821X, http://dx.doi.org/10.1016/0012-821X(85)90051-2.

Smith, M. R., Laul, J. C., Ma, M. S., Huston, T., Verkouteren, R. M., Lipschutz, M. E., Schmitt, R. A., 1984, Petrogenesis of the SNC (shergottites, nakhlites, chassignites) meteorites: Implications for their origin from a large dynamic planet, possibly Mars. Journal of Geophysical Research: Solid Earth, 89, B612-B630, http://dx.doi.org/10.1029/JB089iS02p0B612.

Becker, R. H., Pepin, R. O., 1984, The case for a martian origin of the shergottites: nitrogen and noble gases in EETA 79001. Earth and Planetary Science Letters, 69 Issue 2, Aug-84, 225-242, ISSN 0012-821X, http://dx.doi.org/10.1016/0012-821X(84)90183-3.

Bogard, D. D., Nyquist, L. E., Johnson, P. H., 1984, Noble gas contents of shergottites and implications for the Martian origin of SNC meteorites. Geochimica et Cosmochimica Acta, 48 Issue 9, Sep-84, 1723-1739, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(84)90028-0.

Bogard, D. D., Johnson P., 1983, Martian gases in an Antarctic meteorite?. Science, 221, 651-654.

Smith, J. V., Steele, I. M., Leitch, C. A., 1983, Mineral chemistry of the shergottites, nakhlites, chassigny, brachina, pallasites and ureilites. Journal of Geophysical Research: Solid Earth, 88, B229-B236, http://dx.doi.org/10.1029/JB088iS01p0B229.

Clayton, R. N., Mayeda, T. K., 1983, Oxygen isotopes in eucrites, shergottites, nakhlites, and chassignites. Earth and Planetary Science Letters, 62 Issue 1, Jan-83, 1-6, ISSN 0012-821X, http://dx.doi.org/10.1016/0012-821X(83)90066-3.

Mcsween Jr., H. Y., Jarosewich, E., 1983, Petrogenesis of the Elephant Moraine A79001 meteorite: Multiple magma pulses on the shergottite parent body. Geochimica et Cosmochimica Acta, 47 Issue 8, Aug-83, 1501-1513, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(83)90309-5.

Ashwal, L. D., Warner, J. L., Wood, C. A., 1982, SNC meteorites: Evidence against an asteroidal origin. Journal of Geophysical Research: Solid Earth, 87, A393-A400, http://dx.doi.org/10.1029/JB087iS01p0A393.

Steele, I. M., Smith, J. V., 1982, Petrography and mineralogy of two basalts and olivine-pyroxene-spinel fragments in achondrite EETA79001. Journal of Geophysical Research: Solid Earth, 87, A375-A384, http://dx.doi.org/10.1029/JB087iS01p0A375.

Marvin, U. B., Mason, B., 1982, Catalog of Meteorites from Victoria Land, Antarctica 1978-1980. Smithsonian Contributions to the Earth Sciences, 24, 97.

Duke, M. B., Bogard, D. D., Annexstad, J. O., 1981, Curatorial functions and the U.S. Antarctic meteorite program. Memoirs of National Institute of Polar Research., Special Issue 20, 25-28, http://ci.nii.ac.jp/naid/110000009429/en/.

Reid, A. M., Score, R., 1981, A preliminary report on the achondrite meteorites in the 1979 U.S. Antarctic meteorite collection. Memoirs of National Institute of Polar Research., Special Issue 20, 33-52, http://ci.nii.ac.jp/naid/110000009431/en/.

RELAB, , Reflectance Experiment Lab , catalogue of samples.

, PLATE Preface-Pictorial Guide to Selected Meteorites, 2015, In Righter, K., Corrigan, C.M., McCoy, T.J., and Harvey, R.P. Meteorites: A Pictorial Guide to the Collection, First Edition, AGU Wiley, Book Plates.

Antarctic Meteorite Petrographic Description

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