Meteoritical Bulletin: Entry for LaPaz Icefield 03639

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LaPaz Icefield 03639

Basic information

Name: LaPaz Icefield 03639
This is an OFFICIAL meteorite name.
Abbreviation: LAP 03639
Observed fall: No
Year found: 2003
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 139.9 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 29(2)	(2006)	R
Meteoritical Bulletin:	MB 92	(2007)	R
Antarctic Meteorite Newsletter:	AMN 31(1)	(2008)	R4
Recommended:			R4 [explanation]

This is 1 of 67 approved meteorites classified as R4. [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)

Comments:

Approved 1 Sep 2006

Writeup

help

Writeup from AMN 29(2):

Sample No.:	LAP 03639; LAP 03731; LAP 03793; LAP 03902; LAP 031144; LAP 031387; LAP 04845
Location:	LaPaz Ice Field
Field No.:	16019; 16519; 16071; 16379; 16623; 16593; 17199
Dimensions (cm):	9.0x5.5x3.6; 4.0x2.5x3.0; 3.0x2.0x2.0; 2.0x1.5x1.25; 1.5x1.0x1.0; 1.25x0.5x1.0; 1.5x1.0x0.75
Weight (g):	139.938; 55.963; 15.043; 6.162; 2.479; 1.093; 1.137
Meteorite Type:	R Chondrite

Macroscopic Description: Kathleen McBride and Cecilia Satterwhite
The exteriors of these R chondrites have brown/black fusion crust with some evaporites. The interiors are gray with some large light and dark inclusions. Some oxidation and rust is present.

Thin Section (,2) Description: Valerie Reynolds and Tim McCoy
The sections are so similar that a single description suffices. The sections consist of ~50% of well-defined, small (up to 1 mm) chondrules set in a slightly recrystallized matrix of silicates and sulfides (both troilite and pentlandite). Olivines are nearly homogeneous (Fa_35-38, with a small tail of analyses down to Fa₆) and pyroxenes exhibit a larger range (Fs_1-30). The meteorites are R chondrites, probably of petrologic type 4.

Thin Section Images

Cross-Polarized Light LAP 03639	Plane-Polarized Light LAP 03639	Cross-Polarized Light LAP 03731	Plane-Polarized Light LAP 03731

Cross-Polarized Light LAP 03793	Plane-Polarized Light LAP 03793	Cross-Polarized Light LAP 03902	Plane-Polarized Light LAP 03902

Cross-Polarized Light LAP 031144	Plane-Polarized Light LAP 031144	Cross-Polarized Light LAP 031387	Plane-Polarized Light LAP 031387

Cross-Polarized Light Light LAP 04845	Plane-Polarized Light Light LAP 04845

Lab Images

LAP 03639

LAP 03731 Image Interior

LAP 03793 Image North

LAP 03902Image North

LAP 031144 Image North

LAP 031387 Image North

LAP 04845 Image North

Data from:
  MB92
  Table 3
  Line 124:

Mass (g):	139.9
Class:	R
Weathering grade:	A/B
Fayalite (mol%):	19-38
Ferrosilite (mol%):	13-29

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 43856 approved meteorites from Antarctica (plus 3802 unapproved names)

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