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Larkman Nunatak 06872
Basic information Name: Larkman Nunatak 06872
     This is an OFFICIAL meteorite name.
Abbreviation: LAR 06872
Observed fall: No
Year found: 2006
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 31 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 31(1)  (2008)  CK6
Meteoritical Bulletin:  MB 94  (2008)  CK6
Recommended:  CK6    [explanation]

This is 1 of 56 approved meteorites classified as CK6.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 17 Feb 2008
Writeuphelp
Writeup from AMN 31(1):
Sample No.: LAR 06872
Location: Larkman Nunatak
Field No.: 19740, 19419, 19978
Dimensions (cm):   3.0 x 2.5 x 1.5; 3.0 x 2.5 x 2.5; 3.0 x 2.5 x 1.5
Weight (g): 18.258; 31.012; 15.492
Meteorite Type:

CK6 Chondrite

Pairing: LAR 06869, LAR 06872, LAR 06873


Macroscopic Description: Kathleen McBride
The exteriors of these meteorites range from rough brown/black fusion crust to smooth black exterior. The interiors have dark gray to black matrix with evaporites, some are rusty and very hard and have small light colored inclusions.

 

Thin Section (,2) Description: Tim McCoy, Linda Welzenbach and Cari Corrigan
The sections exhibit a mixture of fine-grained mixture of olivine, calcic pyroxene and plagioclase with individual grains reaching a few hundred microns, but most grains of apparently finer grain size, perhaps owing to shock. Shock veins cross cut the sections forming a network. Vesicular, melted fusion crust was only present on one of the sections examined.  Oxides and sulfide are relatively common to abundant. Olivine is Fa34, pyroxene is an Al-bearing (2-4 wt.% Al2O3) augite of Fs12Wo50, and a small number of plagioclase analyses suggest considerable heterogeneity An43-88Or0-8. Iron oxide is abundant and appears to be magnetite with significant Fe3+ present (based on low totals), as well as 5 wt.% Cr2O3 and 2 wt.% Al2O3. Sulfide is an Fe,Ni sulfide, likely pentlandite. The meteorites are strongly shocked and metamorphosed chondrites, probably CK6.


Oxygen Isotopic Analysis: D. Rumble, Geophysical Laboratory, Carnegie Institution of Washington
Magnetic fractions (magnetite) were analyzed (after ultrasonication in dilute HCl), which is important because an analysis of silicates will almost certainly give heavier small delta values.

Oxygen isotopic analyses of two small (2-5 mg) pieces yielded the following results:

δ17O = -5.87, δ18O = -2.44, Δ17O = -4.587
δ17O = -5.98, δ18O = -2.46, Δ17O = -4.692
[where Δ17O = δ17O – 0.526 x δ18O]


Thin Section Images

Plane-Polarized
Light LAR 06872
Reflective
Light LAR 06872
Cross-Polarized
Light LAR 06872
LAR 06872 - Plane-Polarized
LAR 06872 - Reflective
LAR 06872 - Cross-Polarized



Lab Images

North View
LAR 06872
LAR 06872 - North View

Data from:
  MB94
  Table 4
  Line 782:
Mass (g):31
Class:CK6
Weathering grade:C
Fayalite (mol%):34
Plots: O isotopes:  
Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 31(1) (2008), JSC, Houston
Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Antarctica
Coordinates:Unknown.

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)

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