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Pecora Escarpment 91084
Basic information Name: Pecora Escarpment 91084
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 91084
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 34.4 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 16(1)  (1993)  C2
Meteoritical Bulletin:  MB 76  (1994)  C2
NHM Catalogue:  5th Edition  (2000)  C2
MetBase:  v. 7.1  (2006)  C2
Antarctic Meteorite Newsletter:  AMN 33(1)  (2010)  CM2
Recommended:  CM2    [explanation]

This is 1 of 541 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Writeuphelp
Writeup from AMN 16(1):

Sample No.: PCA91084; 91147; 91203

Location: Pecora Escarpment

Dimensions (cm): 4.5 x 3.2 x 1.5; 1.6 x 1.0 x 0.8; 2.1 x 1.5 x 1

Weight (g): 34.4; 2.8; 4.2

Meteorite Type: C2 Chondrite

 

Macroscopic Description: Cecilia Satterwhite and Robbie Marlow

Less than half of the exterior of these specimens are covered with black shiny fusion crust. The interior matrices are jet black and contain numerous small inclusions/chondrules. Evaporite deposits are present on the interior surfaces of 91084 and 91203.

 

Thin Section (91084,2; 91147,2;  91203,2) Description: Brian Mason

These sections are so similar that one description suffices; the meteorites are probably paired. They show numerous chondrules, up to 0.6 mm across, irregular aggregates, and mineral grains in a black carbonaceous matrix. The minerals are mainly olivine, with minor pyroxene. Olivine compositions are mostly near Mg2SiO4, but occasional iron-rich grains are analyzed, up to Fa59. Pyroxene compositions range from Fs1 to Fs9. The meteorites are C2 chondrites.

 

Data from:
  MB76
  Table 2
  Line 4933:
Origin or pseudonym:Kink Bowl
Mass (g):34.4
Class:C2
Weathering grade:Be
Fayalite (mol%):1-59
Ferrosilite (mol%):1-6
Comments:91084 pairing group
Catalogs:
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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° 40' 35"S, 69° 4' 58"W)
Note: the NHM and MetBase coordinates are 5.8 km apart

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