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Elephant Moraine 87507
Basic information Name: Elephant Moraine 87507
     This is an OFFICIAL meteorite name.
Abbreviation: EET 87507
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 36.2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  C4
AMN 17(1)  (1994)  CK5
Meteoritical Bulletin:  MB 76  (1994)  CK5
NHM Catalogue:  5th Edition  (2000)  CK5
MetBase:  v. 7.1  (2006)  CK5
Recommended:  CK5    [explanation]

This is 1 of 157 approved meteorites classified as CK5.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Writeuphelp
Writeup from AMN 11(2):

Sample No.: EET87507; 87508; 87514; 87519; 87525; 87526; 87527; 87529

Location: Elephant Moraine

Field No.: 4331; 4345; 5079; 5032; 4313; 4183; 2205; 4179

Weight (g): 36.2; 13.4; 33.6; 23.2; 10.3; 88.2; 5.8; 35.7

Dimensions (cm): 3.5x3x2; 3.2x2x1; 3x3x2; 2.7x1.7x1.5; 5x4x3; 2.7x1.5x1; 4x3x2

Meteorite Type: C4 Chondrite

 

Macroscopic Description: René Martinez, Carol Schwarz and Roberta Score

All of these specimens have weathered and fractured patchy fusion crust with salt present in some cases. Interiors are fine-grained and light to dark gray. Dark inclusions, up to 1.5 mm, are plentiful. A 5 mm spherical black aphanitic inclusion was found in EET87507.

 

Thin Section (87507,5; 81508,2; 87514,4; 87119,2; 87525,2; 87526,8; 87127,2; 87529,4) Description: Brian Mason

The section of EET87526 shows an aggregate of small (0.01-0.02 mm) olivine grains and a little opaque material, with sparse chondrules up to 1.5 mm across. Fusion crust, 0.6 mm thick, borders part of the section. Olivine composition is Fa29; a little pyroxene, Wo1Fs24, and plagioclase, An49, are present. The opaque material is mainly magnetite with a little pentlandite. This is a C4 chondrite. The sections of EET87507 and 87529 are so similar to EET87526 in textures and mineral compositions that the meteorites can be confidently paired. EET87508, 87514, 87519, 87525, and 87527 also appear to belong to this group of C4 chondrites. These five were examined in thin section but were not analyzed by electron microprobe.

Data from:
  MB76
  Table 2
  Line 1681:
Origin or pseudonym:Texas Bowl
Mass (g):36.2
Class:CK5
Weathering grade:B
Fayalite (mol%):29
Ferrosilite (mol%):25
Comments:NTL=0.9±0.8; 87507 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 11(2) (1988), 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° 16' 47"S, 156° 27' 24"E)
Note: the NHM and MetBase coordinates are 21.7 km apart

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