Meteoritical Bulletin: Entry for LaPaz Icefield 031190

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LaPaz Icefield 031190

Basic information

Name: LaPaz Icefield 031190
This is an OFFICIAL meteorite name.
Abbreviation: LAP 031190
Observed fall: No
Year found: 2003
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 4.7 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 29(2)	(2006)	Eucrite-br
Meteoritical Bulletin:	MB 92	(2007)	Eucrite-br
Recommended:			Eucrite-br [explanation]

This is 1 of 218 approved meteorites classified as Eucrite-br. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 1 Sep 2006

Writeup

help

Writeup from AMN 29(2):

Sample No.:	LAP 031190; LAP 031379
Location:	LaPaz Ice Field
Field No.:	16611; 16598
Dimensions (cm):	2.5x1.5x1.0; 2.0x1.5x1.25
Weight (g):	4.733; 4.335
Meteorite Type:	Eucrite (Brecciated)

Macroscopic Description: Kathleen McBride
The exterior surface has black/brown fusion crust, shiny on some surfaces, dull on others. The exterior is a gray matrix with little rust and dark gray and white angular clasts.

Thin Section (,2) Description: Tim McCoy and Valerie Reynolds
These meteorites are so similar that a single description suffices. The meteorites are dominated by fine-grained (~200 micron average grain size) basaltic material with patches of interlocking euhedral plagioclase crystals up to 1 mm and basaltic clasts up to 1 mm. Weathering is moderate. Mineral compositions are homogeneous with orthopyroxene (Fs₅₆Wo₃), with lamellae of augite (Fs₂₅Wo₄₃), and plagioclase (An₈₉Or_0.5). The Fe/Mn ratio of the pyroxene is ~29. The meteorites are brecciated eucrites.

Thin Section Images

Cross-Polarized Light LAP 031190	Plane-Polarized Light LAP 031190	Cross-Polarized Light LAP 031379	Plane-Polarized Light LAP 031379
		LAP 031379 - Cross-Polarized Light">	LAP 031379 - Plane-Polarized Light">

Lab Images

LAP 031190 Image North

<a href=

LAP 031379 Image North" border="0">

Data from:
  MB92
  Table 3
  Line 358:

Mass (g):	4.7
Class:	Euc-brecciated
Weathering grade:	A
Ferrosilite (mol%):	25-57

Catalogs:

Search for this meteorite in the NASA/JSC database (U.S.):

References:

Published in Antarctic Meteorite Newsletter 29(2) (2006), JSC, Houston
Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Photographs from AMN:
JSC	A photo is in the write-up above

Geography:

Antarctica

Antarctica

Coordinates:

Unknown.

Statistics:
This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names)

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