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Elephant Moraine 92011
Basic information Name: Elephant Moraine 92011
     This is an OFFICIAL meteorite name.
Abbreviation: EET 92011
Observed fall: No
Year found: 1992
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 17.5 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 17(1)  (1994)  CR2
Meteoritical Bulletin:  MB 79  (1996)  CR2
NHM Catalogue:  5th Edition  (2000)  CR2
MetBase:  v. 7.1  (2006)  CR2
Recommended:  CR2    [explanation]

This is 1 of 163 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Writeuphelp
Writeup from AMN 17(1):

Sample No.: EET92011; 92042; 92048;92052;92062; 92065; 92070; 92092; 92094

Location: Elephant Moraine

Dimensions (cm): 3 x 2.5 x 2; 5 x 4 x 2.5; 3.5 x 2.8 x 3.1; 5.3 x 3.0 x 3.4; 4.0 x 4.1 x 2.4; 4.0 x 2.8 x 2.2; 3.5 x 2.1 x 1.9; 2 x 1.5 x 0.7; 3.5 x 2.2 x 1.3

Weight (g): 17.5; 103.7; 58.5; 89.6; 73.5; 46.7; 17.8; 3.5; 16.7

Meteorite Type: CR2 chondrite

 

Macroscopic Description: Cecilia Satterwhite, Robbie Marlow and Carol Schwarz

At least 50% of each of these nine specimens are covered with weathered fusion crust. The fusion crust on EET92042 is frothy and black, where it is dull and brown on the other eight specimens. Fractures penetrate the interior of all specimens and they are all moderately to heavily oxidized. A1 of the interiors are rusty brown to black in color and contain numerous chondrulestinckisions that range from 1 mm to 4 m m in size. Small amounts of white evaporite deposit were noted on 92062 and 92092. The evaporite deposit on 92042 has a bluish color.

 

Thin Section (EET92011,2; 92042.4: 92048,2; 92052,2; 92062,2: 92065,2; 92070,2; 92095,2; 92094,2) Description: Brian Mason

The sections are so similar that the meteorites can confidently be paired, and paired with the EET87711 group (Antarctic Meteorite Newsletter 12(3), 1989). They show a close-packed aggregate of chondrules and chondrule fragments, up to 2.8 mm across, in an opaque matrix which contains 10-20% nickel-iron as small globules and rimming chondrules. Fine-grained disseminated troilite may be present in small amounts. Weathering is extensive, with limonitic staining throughout the sections. Most chondrules consist of granular olivine or olivine-pyroxene; some have intergranular pale brown glass. Most of the mineral grains are close to Mg2SiO4 and MgSiO3 in composition: olivine, Fa1-6 (Fa1-32 in 92042,4); pyroxene, Fs2-10. The meteorite is a C2 chondrite of the Renazzo subgroup.

 

Data from:
  MB79
  Table 2
  Line 211:
Origin or pseudonym:Northern Ice Patch
Mass (g):17.5
Class:CR2
Weathering grade:B/C
Fayalite (mol%):1-6
Ferrosilite (mol%):1-10
Comments:87711 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 17(1) (1994), JSC, Houston
Published in Meteoritical Bulletin, no. 79, MAPS 31, A161-A174 (1996)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 11'S, 157° 10'E)
     Recommended::   (76° 1' 41"S, 156° 2' 18"E)
Note: the NHM and MetBase coordinates are 34.9 km apart

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