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Pecora Escarpment 01026
Basic information Name: Pecora Escarpment 01026
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 01026
Observed fall: No
Year found: 2002
Country: Antarctica [Collected by Planetary Studies Foundation (US)]
Mass:help 29 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Acapulcoite
Recommended:  Acapulcoite    [explanation]

This is 1 of 79 approved meteorites classified as Acapulcoite.   [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites
Comments: Approved 2 Jan 2012
Writeuphelp
Writeup from MB 100:

Pecora Escarpment 01026 (PCA 01026)        85°39.123’S, 68°34.160’W

Antarctica

Found: 2002 Jan 20

Classification: Primitive achondrite (Acapulcoite)

Petrography: Metamorphic texture with triple grain junctions; grain size is mostly 0.2-0.4 mm with a few grains to 1 mm. Assemblage of olivine, orthopyroxene, clinopyroxene, kamacite (~15 vol.%, with cuspate grain shapes), troilite and twinned sodic plagioclase.

Geochemistry: Olivine Fa7.4-7.6, Fe/Mn=17; orthopyroxene Fs8.1-8.4, Fe/Mn=11; clinopyroxene Fs3.9Wo42.3-42.6, Fe/Mn=7-8; plagioclase An18.8Or2.9-3.2. Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed sub-samples by laser fluorination gave, respectively δ17O -0.580, -0.538; δ18O 1.103, 1.244; Δ17O -1.161, -1.193 per mil.

Classification: Acapulcoite

Specimens: Remaining stone plus one polished thin section at FMNH

Data from:
  MB100
  Table 1
  Line 1766:
State/Prov/County:Antarctica
Origin or pseudonym:Pecora Escarpment
Date:2002 Jan 20
Latitude:85°39.123'S
Longitude:68°34.160'W
Mass (g):29
Pieces:1
Class:Acapulcoite
Shock stage:low
Weathering grade:low
Fayalite (mol%):7.4-7.6
Ferrosilite (mol%):8.1-8.4
Wollastonite (mol%):2.2-2.5
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):29
Type spec location:FMNH
Main mass:FMNH
Finder:R. Garriott
Comments:Submitted by P. Sipiera
Plots: O isotopes:  
Institutions
   and collections
FMNH: Department of Geology The Field Museum of Natural History 1400 South Lake Shore Drive Chicago, IL 60605-2496, USA, United States; Website (institutional address; updated 16 Nov 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Geography:

Antarctica
Coordinates:
     Recommended::   (85° 39' 7"S, 68° 34' 10"W)

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