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LaPaz Icefield 04757
Basic information Name: LaPaz Icefield 04757
     This is an OFFICIAL meteorite name.
Abbreviation: LAP 04757
Observed fall: No
Year found: 2004
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 12.8 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 30(1)  (2007)  Chondrite-ung
Meteoritical Bulletin:  MB 92  (2007)  Acapulcoite
Recommended:  Chondrite-ung    [explanation]

This is 1 of 24 approved meteorites classified as Chondrite-ung.   [show all]
Search for other: Ungrouped chondrites
Comments: Approved 16 Feb 2007
Writeuphelp
Writeup from AMN 30(1):
Sample No.: LAP 04757; LAP 04773
Location: LaPaz Ice Field
Field No.: 17603; 17035
Dimensions (cm):   2.5x2.0x1.0; 2.25x1.25x1.5
Weight (g): 12.8; 8.298
Meteorite Type: Chondrite Ungrouped


Macroscopic Description: Kathleen McBride
Exteriors of these meteorites have dull brown/black fusion crust with oxidation haloes. The interiors reveal a rusty brown/black matrix with high metal content.


Thin Section (,2) Description: Tim McCoy and Valerie Reynolds
These meteorites are so similar that a single description suffices. The sections consist of abundant chondrules set in a metal- and sulfide-bearing, weathered matrix. Shock effects are present, including metal-sulfide melting at grain boundaries. Olivine is homogeneous at Fa13 and pyroxene exhibits a small range at Fs13-16. Links to the acapulcoites or low-FeO chondrites (Russell et al., 1998, MAPS 33, 853-856) should be considered, although LAP 04773/04757 are less metamorphosed than the former and more magnesian than is typical for the latter.



Thin Section Images

Cross-Polarized
Light LAP 04757
Plane-Polarized
Light LAP 04757
Reflected Light
LAP 04757
LAP 04757 - Cross-Polarized Light LAP 04757 - Plane-Polarized Light LAP 04757 - Reflected Light
Cross-Polarized
Light LAP 04773
Plane-Polarized
Light LAP 04773
Reflected Light
LAP 04773
<a href=LAP 04773 - Cross-Polarized Light <a href=LAP 04773 - Plane-Polarized Light <a href=LAP 04773 - Reflected Light



Lab Images

LAP 04757
<a href=LAP 04773

Data from:
  MB92
  Table 3
  Line 295:
Mass (g):12.8
Class:Acp
Weathering grade:C
Fayalite (mol%):13
Ferrosilite (mol%):12-17
Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 30(1) (2007), JSC, Houston
Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photographs from AMN:
JSC A photo is in the write-up above
Geography:

Antarctica
Coordinates:Unknown.

Statistics:
     This is 1 of 38937 approved meteorites from Antarctica (plus 5051 unapproved names)

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