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LaPaz Icefield 02238
Basic information Name: LaPaz Icefield 02238
     This is an OFFICIAL meteorite name.
Abbreviation: LAP 02238
Observed fall: No
Year found: 2002
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 26.6 g
Antarctic Meteorite Newsletter:  AMN 26(2)  (2003)  R
Meteoritical Bulletin:  MB 88  (2004)  R
MetBase:  v. 7.1  (2006)  R
Recommended:  R    [explanation]

This is 1 of 3 approved meteorites classified as R.   [show all]
Search for other: Rumuruti chondrites
Writeup from AMN 26(2):
Sample No.: LAP 02238
Location: LaPaz Ice field
Field No.: 15181
Dimensions (cm):   3.0x2.5x2.0
Weight (g): 26.553
Meteorite Type: R Chondrite

Macroscopic Description: Kathleen McBride
75% of the exterior has a shiny, black fusion crust. The bottom portion of the rock shows polygonal fractures. The exposed interior has weathered to a greenish-brown color. The interior is a gray matrix with white to light gray clasts 1-3 mm in length. Black clasts < 1 mm. This meteorite is moderately hard, with metal grains. Some rusty and oxidized areas are present.

Thin Section (,4) Description: Tim McCoy, Linda Welzenbach
The section consists of relatively few chondrules (up to 1 mm) and chondrule fragments in a fine-grained brecciated matrix, with very abundant iron sulfide and pentlandite and lesser abundances of oxides and graphite. Mineral compositions are olivine of Fa27-46 (most Fa38-40), orthopyroxene of Fs18-36Wo1-3 and augite Fs9-15Wo44-48. The olivine composition is similar to R chondrites, although graphite has not been previously reported in this group.

Oxygen Isotope Analysis: T.K. Mayeda and R.N. Clayton
Our analysis for LAP 02238 gives: δ 18 O = +3.5 and δ 17 O = +4.5. This gives Δ 17 of +2.7, in the range of R-chondrites, consistent with the very iron-rich olivine. The δ values are a little lower than the previous values seen in R chondrites (Y-75302).

Skip TS Images lap02238
LAP 02238 - Plane-Polarized Light LAP 02238 - Cross-Polarized Light LAP 02238 - Plane-Polarized Light LAP 02238 - Cross-Polarized Light
Plane-Polarized Light Cross-Polarized Light Plane-Polarized Light Cross-Polarized Light

Data from:
  Table A1
  Line 23:
Mass (g):26.553
Weathering grade:B
Fayalite (mol%):27-46
Ferrosilite (mol%):18-36
Plots: O isotopes:  
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 26(2) (2003), JSC, Houston
Published in Meteoritical Bulletin, no. 88, MAPS 39, A215-A272 (2004)
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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      

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

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