header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 21 Sep 2019
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:  
Allan Hills 84009
Basic information Name: Allan Hills 84009
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84009
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 336 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(2)  (1986)  Aubrite
Meteoritical Bulletin:  MB 76  (1994)  Aubrite
NHM Catalogue:  5th Edition  (2000)  Aubrite
MetBase:  v. 7.1  (2006)  Aubrite
Recommended:  Aubrite    [explanation]

This is 1 of 63 approved meteorites classified as Aubrite.   [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites
Writeuphelp
Writeup from AMN 9(2):

Sample No..: ALH84009, 010, 012, 013, 014, 015, 016, 017, 018, 019, 020, 021, 022, 024

Location: Allan Hills

Meteorite Type: Aubrite

See Table 4 for weights, dimensions, and field numbers.

 

Macroscopic Description: René Martinez

Most of these aubrites have thin patchy brown to yellow fusion crust. All specimens are slightly weathered. Enstatite clasts are as large as 3.5 cm and as small as 1 mm. The clast population ranges from sparse to dense for the different specimens. Dark aphanitic inclusions and metallic inclusions surrounded by oxidation haloes are both common.

 

Thin Section Description: Brian Mason

Polished thin sections of these specimens show that they are aubrites, and can confidently be paired with ALH84007, 008, and 011 (described in Antarctic Meteorite Newsletter 8(2), and probably with ALH83009 and 015, collected in the same area (Middle Western Icefield). They consist almost entirely of iron-free enstatite, with rare plagioclase (An7-10), forsterite (usually iron-free, but up to Fa9), and iron-free diopside (Wo42). Small amounts of opaque minerals are present; these include troilite, oldhamite, alabandite, daubreelite, and nickel-iron.

 

Visual inspection of chips of ALH84014, 015, 018, 019, 020, 021, and 022 show that these are also aubrites, probably pieces of the same meteorite.

Data from:
  MB76
  Table 2
  Line 975:
Origin or pseudonym:Middle Western
Mass (g):335.6
Class:Aub
Weathering grade:A
Fayalite (mol%):0
Ferrosilite (mol%):0
Comments:83009 pairing group
Catalogs:
Search for specimens in the Smithsonian Institution collection (U.S.):   
    Require SI photo
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 9(2) (1986), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 51' 56"S, 158° 31' 27"E)
Note: the NHM and MetBase coordinates are 33.6 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
Proximity search:
Find nearby meteorites: enter search radius (km):

Direct link to this page