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Elephant Moraine 90001
Basic information Name: Elephant Moraine 90001
     This is an OFFICIAL meteorite name.
Abbreviation: EET 90001
Observed fall: No
Year found: 1990
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 53.2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 15(1)  (1992)  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 15(1):

Sample No.: EET90001; 90002; 90003; 90025; 90026

Location: Elephant Moraine

Field Number: 6383; 6852; 6804; 6953; 6432

Dimensions (cm): 3.8 x 3.8 x 2.8; 3 x 2.8 x 1.5; 3.5 x 2.5 x 1.8; NA; 3.5 x 2.0 x 4.5

Weight (g): 53.2; 28.0; 30.8; 45.8; 61.5

Meteorite Type: C4 chondrite

 

Macroscopic Description: Robbie Marlow and Cecilia Satterwhite

Some fusion crust is present on all of these meteorites, the amount varying from 10% to 95%. The fusion crust is generally thin and black. Traces to abundant amounts of evaporite deposits are present. The deposit is white on most specimens except for 90003 where it has a greenish-blue color similar to that seen on EET90004 and 007. The interior of these Elephant Moraine C4's is medium gray. Cream-colored inclusions are present as is a small amount of metal.

 

Thin Section (EET90001,8; 90002,5: 90003,3; 90025,2; 90026,2) Description: Brian Mason

These sections are identical with the EET90004 group previously described (Antarctic Meteorite Newsletter, vol. 14, no. 2, 1991), and can confidently be paired with them. Additional specimens paired on optical examination are 90005, 006, 008, 009, 010, 013, 014, 016, 017, 023, 027, 028, 035, 036, 038, 039, 040, 041, 042, 043 [sic], 044, 045, 046, 047 [sic], 048, 049, 050, 052.

 

In the original description of the EET90004 group they were classed as C4 chondrites and tentatively paired with the EET 87507 group. Recently Kallemeyn et al. (Geochimica et Cosmochimica Acta, vol. 55, p. 883, 1991) reassigned EET87507 and its paired specimens from type 4 to type 5 "on the basis of their coarse silicate groundmass (50-200 µm) and highly recrystallized, barely discernable chondrules." However, well-defined chondrules are present in the following sections: EET87507,5; 87526,8; 90002,5; 90004,4; 90015,6; 90018,3; 90022,4. In fact, these sections are very similar to those of Karoonda, which is generally accepted as a C4 chondrite. Under these circumstances the original classification of these meteorites as C4 chondrites is retained.

 

Data from:
  MB76
  Table 2
  Line 2034:
Origin or pseudonym:Texas Bowl
Mass (g):53.2
Class:CK5
Weathering grade:Be
Fayalite (mol%):29
Comments:NTL=1.1±0.1; 87507 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 15(1) (1992), 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° 17' 38"S, 156° 26' 27"E)
Note: the NHM and MetBase coordinates are 22.9 km apart

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