Meteoritical Bulletin: Entry for Pecora Escarpment 91008

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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: 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)

Writeup

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:

Search for specimens in the Smithsonian Institution collection (U.S.):	Require SI photo
Search for this meteorite in the NASA/JSC database (U.S.):

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 40756 approved meteorites from Antarctica (plus 4494 unapproved names)

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