Meteoritical Bulletin: Entry for LaPaz Icefield 031381

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LaPaz Icefield 031381

Basic information

Name: LaPaz Icefield 031381
This is an OFFICIAL meteorite name.
Abbreviation: LAP 031381
Observed fall: No
Year found: 2003
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 1.89 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 27(3)	(2004)	Diogenite-olivine
Meteoritical Bulletin:	MB 89	(2005)	Diogenite-olivine
MetBase:	v. 7.1	(2006)	Diogenite
Recommended:			Diogenite [explanation]

This is 1 of 522 approved meteorites classified as Diogenite. [show all]
Search for other: Achondrites, Diogenites, and HED achondrites

Writeup

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Writeup from AMN 27(3):

Sample No.:	LAP 03979; LAP 031381
Location:	LaPaz Icefield
Field No.:	16489; 16628
Dimensions (cm):	1.5x1.25x0.75 1.5x1.25x0.75
Weight (g):	2.406; 1.890
Meteorite Type:	Diogenite (Olivine)

Macroscopic Description: Kathleen McBride
95% of the exterior is covered with brown/black fusion crust with small shiny patches. The rusty, granular interior has mm sized black inclusions and green mineral grains that are up to 2 mm in size.

Thin Section (,2) Description: Tim McCoy, Linda Welzenbach
These two small sections are unbrecciated rocks dominated by orthopyroxene (Fs₂₅Wo₃), olivine (Fa₃₀) and plagioclase (An_80-85Or₁). Most grains are less than 0.5 mm in diameter, although a single pyroxene in 031381 reaches 4 mm. The meteorites are unbrecciated olivine diogenites.


LAP 03979 Cross-Polarized Light	LAP 03979 Plane-Polarized Light	LAP 031381 Cross-Polarized Light

LAP 031381 Plane-Polarized Light	LAP 031381 Cross-Polarized Light	LAP 031381 Plane-Polarized Light

Data from:
  MB89
  Table A1
  Line 231:

Mass (g):	1.89
Class:	Dio/Ol
Weathering grade:	B
Fayalite (mol%):	30
Ferrosilite (mol%):	25

Catalogs:

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References:

Published in Antarctic Meteorite Newsletter 27(3) (2004), JSC, Houston
Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)

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Photos:

Credit	Photos
Photographs from AMN:
Photograph from unknown source	A photo is in the write-up above
Photos from the Encyclopedia of Meteorites:
Dr Carlton Allen, JSC-KT, NASA

Geography:

Antarctica

Antarctica

Coordinates:
Recommended::	(86° 22'S, 70° 0'W)

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

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