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Ooldea 004
Basic information Name: Ooldea 004
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2013
Country: Australia
Mass:help 1506 g
Meteoritical Bulletin:  MB 108  (2020)  EL3
Recommended:  EL3    [explanation]

This is 1 of 26 approved meteorites classified as EL3.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites
Comments: Approved 21 Nov 2019
Writeup from MB 108:

Ooldea 004        30°33’17.30"S, 131°49’9.20"E

South Australia, Australia

Find: 2013 Apr 9

Classification: Enstatite chondrite (EL3)

History: Many fragments (individual masses are up to 1044 g) possibly representing four individual stones, each extensively broken up and dispersed through desert weathering over about 500 m2, from a newly defined strewn field identified in 2013, and further recovered in 2014 and 2017. The current dimensions of the strewn field is about 200 m by 50 m. These stones were found 15 km from Watson 007, which is an EL3 of the same weathering extent; given the rarity of EL3 chondrites, they are likely to be from the same fall, thus representing a much larger strewn field.

Physical characteristics: Numerous broken fragments up to 10 cm, blocky or flat, weathered to dark brown.

Petrography: (A. Tait, A. Tomkins, Monash) This sample is dominated by orthopyroxene (>95%), although a small proportion of chondrules (~10%) contain olivine. Chondrules are well defined and are mainly RP and PP; they range in size up to 5 mm, with many in the range 1-4 mm. The matrix is opaque and chondrule mesostases typically extremely fine grained (crystals <1 μm). Olivine has straight extinction, and there are no indicators of higher shock. Greater than 95% of the metal has been oxidized, but remaining metal contains exsolved acicular pyroxene crystals, and these can also easily be seen in iron oxide pseudomorphs of metal. Petrographically this meteorite has the same silicate petrography, shock characteristics and extent of weathering as Watson 007, which was found 15 km to the west. Given the rarity of EL3 chondrites, it is highly likely that these are from the same fall, and represent part of a relatively large strewn field.

Geochemistry: (A. Tait, Monash) Low-Ca pyroxene has Fs0.12-1.93, mean = Fs0.74±1.03, n=3, olivine has Fa0.13-2.09, mean = Fa0.46±0.72, n = 7; metal has 0.55 wt.% Si.

Classification: The sparse olivine and very fine grained chondrule mesostases are consistent with Type 3 classification. Low Si in metal indicates EL. Enstatite Chondrite (EL3, S1, W4).

Data from:
  Table 0
  Line 0:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor Plain
Date:2013 Apr 9
Mass (g):1506.0
Shock stage:S1
Weathering grade:W4
Fayalite (mol%):0.61
Ferrosilite (mol%):0.74
Wollastonite (mol%):0.07
Classifier:A. Tomkins, A. Tait, Monash
Type spec mass (g):1500
Type spec location:Monash
Main mass:Monash
Finder:A. Tomkins
Comments:Submitted by A. Tomkins
   and collections
Monash: Building 28 School of Geosciences Monash University Victoria 3800 Australia, Australia (institutional address; updated 12 Dec 2012)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     Recommended::   (30° 33' 17"S, 131° 49' 9"E)

     This is 1 of 240 approved meteorites from South Australia, Australia (plus 3 unapproved names) (plus 4 impact craters)
     This is 1 of 717 approved meteorites from Australia (plus 46 unapproved names) (plus 27 impact craters)
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