Meteoritical Bulletin: Entry for Pecora Escarpment 01030

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Pecora Escarpment 01030

Basic information

Name: Pecora Escarpment 01030
This is an OFFICIAL meteorite name.
Abbreviation: PCA 01030
Observed fall: No
Year found: 2002
Country: Antarctica [Collected by Planetary Studies Foundation (US)]
Mass: 14.2 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	Diogenite-pm
Recommended:			Diogenite-pm [explanation]

This is 1 of 63 approved meteorites classified as Diogenite-pm. [show all]
Search for other: Achondrites, Diogenites, and HED achondrites

Comments:

Approved 19 Jan 2012

Writeup

Writeup from MB 100:

Pecora Escarpment 01030 (PCA 01030) 85°39.259’S, 68°34.323’W

Antarctica

Found: 2002 Jan 20

Classification: HED achondrite (Diogenite, polymict)

Petrography: Fragmental breccia consisting mostly of disaggregated material from diogenite protoliths, plus grains of calcic plagioclase and exsolved pigeonite derived probably from cumulate eucrites. Accessory minerals include chromite, ilmenite and troilite. Orthopyroxene exhibits undulose extinction and plagioclase is partly recrystallized (exhibiting complex twinning and some polygonal subgrains). Eucritic material makes up less than 10 vol.% of the specimen.

Geochemistry: Diogenitic orthopyroxene Fs_18.7Wo_1.3, Fs_24.4Wo_3.0, rim Fs_34.0Wo_3.5, Fe/Mn=28-32; orthopyroxene host Fs_51.2Wo_1.6, Fe/Mn=27; clinopyroxene exsolution lamellae Fs_20.9-25.3Wo_43.9-41.3.

Classification: Diogenite-pmict

Specimens: Remaining stone plus one polished thin section at FMNH

Data from:
  MB100
  Table 1
  Line 1770:

Origin or pseudonym:	Pecora Escarpment
Date:	2002 Jan 20
Latitude:	85°39.259'S
Longitude:	68°34.323'W
Mass (g):	14.2
Pieces:	1
Class:	Diogenite-pm
Shock stage:	moderate
Weathering grade:	low
Fayalite (mol%):	44.5
Ferrosilite (mol%):	24.4; 51.2; 20.9-25.3
Wollastonite (mol%):	3.0; 1.6; 43.9-41.3
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	14.2
Type spec location:	FMNH
Main mass:	FMNH
Finder:	A. Mortvedt
Comments:	Submitted by P. Sipiera

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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)

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Geography:

Antarctica

Coordinates:
Recommended::	(85° 39' 16"S, 68° 34' 19"W)

Statistics:
This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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