header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 14 Oct 2020
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Larkman Nunatak 04315
Basic information Name: Larkman Nunatak 04315
     This is an OFFICIAL meteorite name.
Abbreviation: LAR 04315
Observed fall: No
Year found: 2003
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1165 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 28(2)  (2005)  Ureilite-an
Meteoritical Bulletin:  MB 91  (2007)  Ureilite-an
Recommended:  Ureilite-an    [explanation]

This is 1 of 6 approved meteorites classified as Ureilite-an.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 1 Sep 2005
Writeuphelp
Writeup from AMN 28(2):
Sample No.: LAR 04315
Location: Larkman Nunatak
Field No.: 15558
Dimensions (cm):   12.5x7.0x5.0
Weight (g): 1164.8
Meteorite Type: Ureilite (Anomalous)
    
LAR 04315 LAR 04315 LAR 04315
LAR 04315 LAR 04315 LAR 04315
   

Macroscopic Description: Kathleen McBride
Dark brown/black patchy fusion crust covers 65% of the exterior. Exposed interior is dark in color with lighter inclusions. The interior is dark, ultramafic with a few light inclusions. This hard meteorite is rusty and has a coarse grained texture. Weathering is more extensive near the exterior.

Thin Section (,7) Description: Tim McCoy
The section consists of an aggregate of large olivine and pyroxene grains up to 2 mm across. Olivine grains are rimmed by carbon-rich material containing traces of metal. While these metal-bearing rims appear to define individual olivine crystals, those crystals exhibit subdomains a few hundred microns across in transmitted light and no reduction is observed between the subdomains. Olivine has cores of Fa19, with rims reduced to Fa2. Metal and sulfide form veins between the olivines, with metal often forming rounded blebs within the sulfide. The pyroxene grains are dominantly pigeonite (Fs7-9Wo7-9) and exhibit a wormy texture with elongate and irregular voids (graphite-filled?), and inclusions of metal and sulfide (sometimes associated with the voids). Within the pigeonites, but distinct from the voids, are found inclusions of subcalcic augite (Fs7-9Wo24-28) and, in association, an apparently non-stoichiometric phase highly enriched in SiO2, and contains Al2O3. The meteorite is an anomalous ureilite.
Oxygen isotope analysis - J. Farquhar:
δ18O = 7.2 per mil; Δ17O = -0.8 per mil


LAR 04315 - Cross-Polarized Light LAR 04315 - Reflected Light LAR 04315 - Cross-Polarized Light LAR 04315 - Reflected Light LAR 04315 - Cross-Polarized Light
LAR 04315
Cross-Polarized Light
LAR 04315
Reflected Light
LAR 04315
Cross-Polarized Light
LAR 04315
Reflected Light
LAR 04315
Cross-Polarized Light
Data from:
  MB91
  Table 4
  Line 692:
Mass (g):1164.8
Class:Ure (anomalous)
Weathering grade:B/C
Fayalite (mol%):2-19
Plots: O isotopes:  
Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 28(2) (2005), JSC, Houston
Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photographs from AMN:
Photograph from unknown source A photo is in the write-up above
Photos from the Encyclopedia of Meteorites:
unknown         
Geography:

Antarctica
Coordinates:Unknown.

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)

Direct link to this page