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Pecora Escarpment 01021
Basic information Name: Pecora Escarpment 01021
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 01021
Observed fall: No
Year found: 2002
Country: Antarctica [Collected by Planetary Studies Foundation (US)]
Mass:help 8.5 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 222 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 2 Jan 2012
Writeuphelp
Writeup from MB 100:

Pecora Escarpment 01021 (PCA 01021)        85°40.380’S, 68°43.055’W

Antarctica

Found: 2002 Jan 18

Classification: HED achondrite (Eucrite, monomict)

Petrography: Very fine grained specimen with ophitic texture and vesicles. Exsolved pigeonite (with very fine clinopyroxene lamellae), calcic plagioclase, silica polymorph, ilmenite and troilite.

Geochemistry: Orthopyroxene host Fs61.7-62.2Wo2.5-3.3, Fe/Mn=33-34; clinopyroxene lamellae Fs38.5-44.8Wo31.1-24.7, Fe/Mn=31-32; plagioclase An81.8-88.4Or1.4-0.7. Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed sub-samples by laser fluorination gave, respectively δ17O 1.873, 1.740; δ18O 3.981, 3.831; Δ17O -0.223, -0.276 per mil.

Classification: Momomict eucrite

Specimens: Remaining stone plus one polished thick section at FMNH

Data from:
  MB100
  Table 1
  Line 1761:
State/Prov/County:Antarctica
Origin or pseudonym:Pecora Escarpment
Date:2002 Jan 18
Latitude:85°40.380'S
Longitude:68°43.055'W
Mass (g):8.5
Pieces:1
Class:Eucrite-mmict
Shock stage:low
Weathering grade:very low
Ferrosilite (mol%):61.7-62.2; 38.5-44.8
Wollastonite (mol%):2.5-3.3; 31.1-24.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):8.5
Type spec location:FMNH
Main mass:FMNH
Finder:D. Martin
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° 40' 23"S, 68° 43' 3"W)

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