Meteoritical Bulletin: Entry for Pecora Escarpment 01021

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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: 8.5 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	Eucrite-mmict
Recommended:			Eucrite-mmict [explanation]

This is 1 of 274 approved meteorites classified as Eucrite-mmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 2 Jan 2012

Writeup

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 Fs_61.7-62.2Wo_2.5-3.3, Fe/Mn=33-34; clinopyroxene lamellae Fs_38.5-44.8Wo_31.1-24.7, Fe/Mn=31-32; plagioclase An_81.8-88.4Or_1.4-0.7.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 44048 approved meteorites from Antarctica (plus 3802 unapproved names)

Proximity search:

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