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Pecora Escarpment 91082
Basic information Name: Pecora Escarpment 91082
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 91082
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 37.9 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 16(1)  (1993)  CR2
Meteoritical Bulletin:  MB 76  (1994)  CR2
NHM Catalogue:  5th Edition  (2000)  CR2
MetBase:  v. 7.1  (2006)  CR2
Recommended:  CR2    [explanation]

This is 1 of 163 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Writeuphelp
Writeup from AMN 16(1):

Sample No.: PCA91082

Location: Pecora Escarpment

Dimensions (cm): 4.0 x 2.5 x 1.7

Weight (g): 37.9

Meteorite Type: C2R Chondrite

 

Macroscopic Description: Cecilia Satterwhite

The fusion crust on this sample is black, fractured, and shiny in areas. The interior is made up of jet black matrix with abundant light inclusions. The inclusions are very small but can be discerned with the naked eye. Some evaporite deposit was noted as was oxidized matrix.

 

Thin Section (,2) Description: Brian Mason

The section shows a close-packed aggregate of large chondrules (maximum diameter 3 mm) rimmed with black matrix. About 10% of nickel-iron is present, in part concentrated as rims to the chondrules; troilite is present in small amount; about 1%. Chondrule types include granular olivine, barred olivine, and granular clinoenstatite (polysynthetically twinned). The matrix includes some pale green phyllosilicate. Weathering is indicated by pervasive limonitic staining. Microprobe analyses show Mg-rich olivine and pyroxene of somewhat variable composition; olivine, Fa1-5; pyroxene, Fs1-8. The meteorite is tentatively classified as a C2 chondrite of Renazzo subtype, although the amount of carbonaceous matrix is unusually low.

 

Data from:
  MB76
  Table 2
  Line 4931:
Origin or pseudonym:Upper Lulow
Mass (g):37.9
Class:CR2
Weathering grade:Be
Fayalite (mol%):1-5
Ferrosilite (mol%):1-8
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° 38' 7"S, 68° 29' 56"W)
Note: the NHM and MetBase coordinates are 1.7 km apart

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