Meteoritical Bulletin: Entry for Pecora Escarpment 01026

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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: 29 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	Acapulcoite
Recommended:			Acapulcoite [explanation]

This is 1 of 93 approved meteorites classified as Acapulcoite. [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites

Comments:

Approved 2 Jan 2012

Writeup

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 Fa_7.4-7.6, Fe/Mn=17; orthopyroxene Fs_8.1-8.4, Fe/Mn=11; clinopyroxene Fs_3.9Wo_42.3-42.6, Fe/Mn=7-8; plagioclase An_18.8Or_2.9-3.2.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 44543 approved meteorites from Antarctica (plus 3802 unapproved names)

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Revision
history:

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