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Elephant Moraine 83227
Basic information Name: Elephant Moraine 83227
     This is an OFFICIAL meteorite name.
Abbreviation: EET 83227
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1973 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 8(1)  (1985)  Eucrite-pmict
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-pmict
NHM Catalogue:  5th Edition  (2000)  Eucrite-pmict
MetBase:  v. 7.1  (2006)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 341 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from AMN 8(1):

Sample No.: EET83227

Location: Elephant Moraine

Weight (g): 1973.0

Field No.: 2957

Dimensions (cm): 13 x 10 x 9

Meteorite Type: Polymict Eucrite

 

Macroscopic Description: Roberta Score

EET83227 has a rounded shape and the exterior surfaces contain numerous deep vugs. A few millimeter-sized patches of fusion crust remain on the gray exterior. Several different clasts, the largest being 2 cm in longest dimension, are visible on the exterior. These include eucritic clasts, black fine-grained clasts, pinkish-brown crystalline clasts, and black and white clasts. Both interior and exterior surfaces contain numerous oxidation halos as large as 1-cm in diameter. Interior surfaces are lighter gray in color than the exterior. This stone is similar to other 1983 Elephant Moraine eucrites.

 

Thin Section (,4) Description: Jeremy Delaney

The section is a typical polymict eucrite with one large medium-grained mafic clast containing ophitic to radial pyroxene/plagioclase intergrowths. Pyroxene and feldspar in this clast both show zoning and have little clouding. Other clasts include breccia, shocked pyroxene and twinned feldspar. No maskelynite was seen. Coarse-grained lithic fragments, fine-grained granular mafic clasts and rare glassy fragments are also present. Three orthopyroxene grains more magnesian than En70 were located by microprobe, but diogenite-like clasts are very rare.

Data from:
  MB76
  Table 2
  Line 1492:
Origin or pseudonym:Main icefield
Mass (g):1973
Class:Eu "pm"
Weathering grade:B
Ferrosilite (mol%):23-54
Comments:79005 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 8(1) (1985), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 11'S, 157° 10'E)
     Recommended::   (76° 18' 0"S, 157° 16' 23"E)
Note: the NHM and MetBase coordinates are 13.3 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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