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Pecora Escarpment 91003
Basic information Name: Pecora Escarpment 91003
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 91003
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 117.2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 15(2)  (1992)  Iron
AMN 17(1)  (1994)  IAB
Meteoritical Bulletin:  MB 76  (1994)  IAB
NHM Catalogue:  5th Edition  (2000)  IAB
MetBase:  v. 7.1  (2006)  IAB-MG
Recommended:  Iron, IAB-MG    [explanation]

This is 1 of 112 approved meteorites classified as Iron, IAB-MG.   [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites
Writeuphelp
Writeup from AMN 15(2):

Sample No.: PCA91003

Location: Pecora Escarpment

Field Number: 6220

Dimensions (cm): 5.0 x 2.1 x 1.8

Weight (g): 117.2

Meteorite Type: Heat-altered coarse octahedrite?

 

Macroscopic Description: Roy S. Clarke,. Jr,

This somewhat elongated, irregular shaped mass has a reddish brown weathering crust that contains small patchy black areas and is mildly corrosion pitted.

 

Polished Section Description: Roy S. Clarke, Jr,

A slice was removed from near the heavy end of the specimen and a polished section of ~2.4 cm3 was prepared from half of it. Exterior edges of the section are covered with patches of secondary corrosion products from 50 to 350 gm thick over about 80% of the surface. Corrosion has invaded along major grain boundaries visible on sawn surfaces and on the polished section. This grain boundary pattern suggests a coarse octahedrite structure. The interior of the section, however, reveals a preterrestrial heat-altered structure, predominantly recrystallized kamacite. Dimensions of recrystallized grains vary from a few microns to a few hundreds of microns. Micron to submicron precipitates are common along kamacite grain boundaries and within kamacite grains. Many of these seem to be kamacite, but some are undoubtedly taenite. Individual kamacite grains vary in Ni and Co contents, some Ni values as low as 3.5% were observed. Typically kamacite contains ~0.15% P. Remnants of cracked and corroded schreibersite crystals are present. Much of the edge of the section has a several hundred micron rim of an α2 atmospheric ablation zone superimposed on the original heat altered structure. This specimen is possibly a preterrestrially heat-altered coarse octahedrite.

 

Data from:
  MB76
  Table 2
  Line 4865:
Origin or pseudonym:Kink Bowl
Mass (g):117.2
Class:IAB
Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 15(2) (1992), 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' 41"S, 69° 3' 0"W)
Note: the NHM and MetBase coordinates are 5.8 km apart

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