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Pecora Escarpment 91008
Basic information Name: Pecora Escarpment 91008
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 91008
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 51.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 15(2)  (1992)  C2
Meteoritical Bulletin:  MB 76  (1994)  C2
NHM Catalogue:  5th Edition  (2000)  C2
MetBase:  v. 7.1  (2006)  CM2
Antarctic Meteorite Newsletter:  AMN 31(1)  (2008)  CM2
AMN 41(1)  (2018)  CM-an
Recommended:  CM2-an    [explanation]

This is 1 of 10 approved meteorites classified as CM2-an.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Revised 3 Jun 2019: reclassified in AMN 41(1)
Writeuphelp
Writeup from AMN 15(2):

Sample No.: PCA91008

Location: Pecora Escarpment

Field Number. 8801

Dimensions (cm): 3.9 x 3.1 x 3.4

Weight (g): 51.7

Meteorite Type: C2 chondrite

 

Macroscopic Description: Robbie Marlow

Ninety percent of the exterior is covered with thin, dull, black fusion crust. A few irregular-shaped beige-colored inclusions dot the dark gray to black matrix. Tiny specks of metal are scattered throughout the interior.

 

Thin Section (.7) Description: Brian Mason

The section shows numerous small chondrules (up to 0.6 mm across), irregular aggregates, and mineral grains in a black matrix. Remnants of fusion crust are present along one edge. Microprobe analyses show olivine compositions mainly Fa0-2, but with a few iron-rich grains; pyroxene compositions are mainly Fs1, but range up to Fs7. The meteorite is a C2 chondrite.

 


Writeup from AMN 41(1):
PCA 91008: reclassification

Listed by Choe et al. (2010) as CM-anomalous
Bibliography:
  • Choe W. H., Huber H., Rubin A.E., Kallemeyn G. W., and Wasson J. T. (2010) Compositions and taxonomy of 15 unusual carbonaceous chondrites. Meteorit. Planet. Sci. 45, 531-554 (link)
Data from:
  MB76
  Table 2
  Line 4870:
Origin or pseudonym:Kink Bowl
Mass (g):51.7
Class:C2
Weathering grade:B
Fayalite (mol%):1-37
Ferrosilite (mol%):1-7
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 15(2) (1992), JSC, Houston
Published in Antarctic Meteorite Newsletter 41(1) (2018), 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' 40"S, 69° 4' 39"W)
Note: the NHM and MetBase coordinates are 5.9 km apart

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