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Elephant Moraine 87711
Basic information Name: Elephant Moraine 87711
     This is an OFFICIAL meteorite name.
Abbreviation: EET 87711
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 5.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 12(3)  (1989)  C2
AMN 13(1)  (1990)  CR2
Meteoritical Bulletin:  MB 76  (1994)  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 12(3):

Sample No.: EET87711; EET87747; 87770; 87812; 87846; 87847; 87850

Dimensions (cm): 2x1.5x1; 3.5x3x2; 4x2.5x2; 3x1.5x1.5; 2.5x1.5x1; 2.5x2 5x2; 2x2x1.5

Weight (g): 5.7; 38.2; 38.6; 11.9; 8.1; 32.9; 14.5

Meteorite Type: C2 chondrite

Location: Elephant Moraine

Field Number: 4443; 4362; 4464; 4349; 4359; 4696; 4363

 

Macroscopic Description: Carol Schwarz, René Martinez

These seven specimens have between 40 and 103% thick fractured fusion crust covering their exterior surfaces The interior of each consists of black to reddish brown fine grained matrix with abundant light and yellowish chondrules and angular clasts. One 5 mm white clast was noted in 87746. and evaporite deposits were noted on 87850 Several fragments are extremely friable.

 

Thin Section (EET87711,2; 747,4; 770,3; 812,3; 846,2; 847,2; 850,2) Description: Brian Mason

These sections are unique and so similar that the meteorites can confidently be paired. They show a close-packed aggregate of large chondrules and chondrule fragments, up to 2.8 mm across, in a black matrix containing a moderate amount of nickel-iron and very little sulfide. Most chondrules consist of granular olivine or olivine-pyroxene; some have intergranular pale brown glass. The matrix appears to consist largely of phyllosilicates. Brown limonitic staining pervades the sections. Microprobe analyses show most of the olivine and pyroxene grains are near Mg2SiO4 and MgSiO3 in composition, averaging Fa2 and Fs2 respectively, although a few more Fe-rich grains were analysed. The meteorites are tentatively classified as C2 chondrites; the textures and relative abundance of nickel-iron suggest a relationship to the Renazzo and Al Rais meteorites.

Data from:
  MB76
  Table 2
  Line 1884:
Origin or pseudonym:Northern Ice Patch
Mass (g):5.7
Class:CR2
Weathering grade:B/C
Fayalite (mol%):0.8-3
Ferrosilite (mol%):1-3
Comments:87711 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 12(3) (1989), 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° 2' 38"S, 156° 5' 10"E)
Note: the NHM and MetBase coordinates are 32.9 km apart

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