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Allan Hills 84036
Basic information Name: Allan Hills 84036
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84036
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 2.8 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(2)  (1986)  C2
AMN 17(1)  (1994)  CM2
Meteoritical Bulletin:  MB 76  (1994)  CM2
NHM Catalogue:  5th Edition  (2000)  CM2
MetBase:  v. 7.1  (2006)  CM2
Recommended:  CM2    [explanation]

This is 1 of 505 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Writeuphelp
Writeup from AMN 9(2):

Sample No..: ALH84036, 039, 046, 050, 053,

Location: Allan Hills

Meteorite Type: C2 Chondrite

See Table 6 for weights, dimensions, and field numbers.

 

Macroscopic Description: Carol Schwarz

Some of these specimens have pitted and fractured fusion crust while some have no fusion crust remaining. The interior of all of these is black with numerous clasts/chondrules that are <0.5 mm in longest dimension. Oxidation is present but minimal. Evaporite deposit has formed on ALH84050 and 054.

 

Thin Section Description: Brian Mason

Thin sections of all these C2 chondrites are so similar that they can be described as a group, and the possibility of pairing should be considered. ALH84033 (Antarctic Meteorite Newsletter 8(2)) is also similar. Olivine-rich chondrules up to 2 mm diameter, chondrule fragments, and irregular olivine-rich inclusions up to 1.5 mm across are present in a black to translucent brown matrix with many small mineral grains. Most of the olivine is near forsterite in composition, but occasional iron-rich grains (up to Fa40) were analysed. Pyroxene is not common, and is poly-synthetically-twinned clionoenstatite. Refractory inclusions up to 0.15-0.2 mm in size, and containing spinel + perovskite + hibonite, are common. Blue pleochroic hibonite is present in only a few inclusions in 036, 039, 046, and 054.

Data from:
  MB76
  Table 2
  Line 1001:
Origin or pseudonym:Far Western
Mass (g):2.8
Class:CM2
Weathering grade:A
Fayalite (mol%):0.7-40
Ferrosilite (mol%):2-13
Comments:81002 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 9(2) (1986), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 53' 43"S, 156° 50' 7"E)
Note: the NHM and MetBase coordinates are 74.9 km apart

Statistics:
     This is 1 of 38940 approved meteorites from Antarctica (plus 5051 unapproved names)
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