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Pecora Escarpment 91079
Basic information Name: Pecora Escarpment 91079
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 91079
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 3.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 16(1)  (1993)  Eucrite
AMN 17(1)  (1994)  Eucrite-br
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-br
NHM Catalogue:  5th Edition  (2000)  Eucrite-br
MetBase:  v. 7.1  (2006)  Eucrite-mmict
Recommended:  Eucrite-br    [explanation]

This is 1 of 179 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from AMN 16(1):

Sample No.: PCA91079; 91159; 91193

Location: Pecora Escarpment

Dimensions (cm): 2 x 1 x 0.8; 2.5 x 1.5 x 1.0; 2.5 x 2.0 x 1.2

Weight (g): 3.7; 8.4; 12.3

Meteorite Type: Eucrite

 

Macroscopic Description: Carol Schwarz and Celicia Satterwhite

All three of these specimens are -80% covered with thin shiny black fusion crust. The interior matrices are gray in color with numerous <0.5 mm white and tan clasts. PCA91159 contains a large area of dark (glassy ?) matrix, and 91193 has evaporite deposits.

 

Thin Section (91079,2; 91159,2; 91193,21 Description: Brian Mason

These sections are so similar that a single description suffices; the meteorites are probably paired. They show clasts of plagioclase and pyroxene, up to 2.4 mm in maximum dimension, in a comminuted matrix of these minerals. Plagioclase composition is An85-90. Pyroxene compositions cluster around Wo2Fs46, with some more calcic grains, ranging up to Wo38Fs18. The meteorites are monomict eucrites.

 

Data from:
  MB76
  Table 2
  Line 4928:
Origin or pseudonym:Main
Mass (g):3.7
Class:Eu "br"
Weathering grade:B
Ferrosilite (mol%):31-48
Comments:91079 pairing group
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References: Published in Antarctic Meteorite Newsletter 16(1) (1993), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (85° 38'S, 68° 42'W)
     Recommended::   (85° 41' 2"S, 68° 49' 27"W)
Note: the NHM and MetBase coordinates are 5.7 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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