header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 7 Jul 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:
Include past classifications in search
Limit to approved meteorite names
Search text:  
Elephant Moraine 83309
Basic information Name: Elephant Moraine 83309
     This is an OFFICIAL meteorite name.
Abbreviation: EET 83309
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 60.8 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(1)  (1986)  Achondrite-unique
AMN 13(1)  (1990)  Ureilite
AMN 17(1)  (1994)  Ureilite-pmict
Meteoritical Bulletin:  MB 76  (1994)  Ureilite-pmict
NHM Catalogue:  5th Edition  (2000)  Ureilite-pmict
MetBase:  v. 7.1  (2006)  Ureilite-pmict
Recommended:  Ureilite-pmict    [explanation]

This is 1 of 27 approved meteorites classified as Ureilite-pmict.   [show all]
Search for other: Achondrites, Ureilites
Writeuphelp
Writeup from AMN 9(1):

Sample No.: EET83309

Location: Elephant Moraine

Weight (g): 60.8

Field No.: 1444

Dimensions (cm): 4 x 4 x 2.5

Meteorite Type: Achondrite

 

Macroscopic Description: Roberta Score

Some fusion crust remains on this weathered stone. Though the interior is extensively oxidized, a few platy minerals with well-developed crystal faces can be distinguished.

 

Thin Section (,2) Description: Brian Mason

This meteorite is a microbreccia, consisting largely of olivine clasts (up to 3 mm in maximum dimension), with a lesser amount of pyroxene and a few small plagioclase clasts. Nickel-iron and troilite are present only in traces. One small clast appears to be a fragment of a barred olivine chondrule. Brown limonitic staining pervades the section. Olivine compositions range from Fa8 to Fa25, with most between Fa15 and Fa23. The olivine has unusually high calcium (CaO 0.2-0.5%) and chromium (Cr2O3 0.5-0.9%) contents. Most of the pyroxene is low-Ca, around Wo5Fs18, but a little diopside (Wo39Fs6) is present. Plagioclase compositions show a considerable range, An10-50. The meteorite is classified as an achondrite, but it does not fit in any of the recognized achondrite classes. The high Ca and Cr contents in the olivine are matched only by olivine in ureilites, but this meteorite is distinctly different from the ureilites in other respects, except for the present of small amounts of graphite (not rimming grains as in the ureilites, but as discrete areas).

Data from:
  MB76
  Table 2
  Line 1572:
Origin or pseudonym:Main icefield
Mass (g):60.8
Class:Ur "pm"
Weathering grade:C
Fayalite (mol%):2-38
Ferrosilite (mol%):4-14
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(1) (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° 11'S, 157° 10'E)
     Recommended::   (76° 18' 52"S, 157° 13' 11"E)
Note: the NHM and MetBase coordinates are 14.7 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
Proximity search:
Find nearby meteorites: enter search radius (km):

Direct link to this page