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Yarle Lakes 004
Basic information Name: Yarle Lakes 004
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2009
Country: Australia
Mass:help 4.6 g
Classification
  history:
Meteoritical Bulletin:  MB 99  (2011)  CK4
Recommended:  CK4    [explanation]

This is 1 of 108 approved meteorites classified as CK4.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 18 Jan 2011
Writeuphelp
Writeup from MB 99:

Yarle Lakes 004        30°30’S, 131°28’E

South Australia, Australia

Found: 11 May 2009

Classification: Carbonaceous chondrite (CK4)

History: D. Bradley found a single piece lying on the Nullarbor Plain.

Physical characteristics: The meteorite weighs 4.6 g and measures 2.2 cm x 1.6 cm x 0.7 cm. The surface is dark maroon to black and has no obvious fusion crust. The freshly cut surface reveals a dark rusted brown interior with several paler chondrules scattered throughout.

Petrography: (Kim Lai N. Bell, Monash) Large PO chondrules within a dark stained, fine-grained matrix and are difficult to discern due to the staining. Chondrules have a size range of 0.3-1 mm, with an average diameter of 0.6 mm. Mineralogy differs from an ordinary chondrite in that it contains no obvious metals or sulfides. Mineralogy dominated by olivine, plagioclase, pyroxenes and magnetite. Olivine and pyroxene grains have straight to undulose extinctions and occur within chondrules or as fragments in the matrix. Plagioclase tends to occur as small grains (≤50 μm) within both the matrix and chondrules. The silicates are stained a rusty brown, with up to 75% staining affecting them. Magnetite (4%) grains are irregular shaped, <0.1 mm in size and can be found rimming chondrules and within the matrix.

Geochemistry: EMPA (wt%) Olivine: SiO2 = 36.85, TiO2 = 0.02, Al2O3 = 0.02, FeO = 28.87, MnO = 0.26, MgO = 34.49, CaO = 0.02, Na2O = 0.01, K2O = 0.00, (Fa31.95±0.13, n = 6). Plagioclase: SiO2 = 55.73, TiO2 = 0.01, Al2O3 = 26.27, FeO = 0.52, MnO = 0.01, MgO = 0.22, CaO = 9.71, Na2O = 5.83, K2O = 0.65 (An47.26±18.59, n = 5). Pentlandite: Fe = 27.96, Ni = 30.66, Cr = 1.26, Mg = 0.71. Magnetite: Fe = 61.25, Cr = 3.27, Al = 1.33, Ti = 0.74, Mg = 0.34, Ni = 0.19.

Classification: Carbonaceous chondrite (CK4, S2, W1-4).

Specimens: Sample and one thin section held by A. Tomkins at Monash.

Data from:
  MB99
  Table 0
  Line 0:
State/Prov/County:South Australia
Origin or pseudonym:Nullarbor
Date:11 May 2009
Latitude:30°30'S
Longitude:131°28'E
Mass (g):4.6
Pieces:1
Class:CK4
Shock stage:S2
Weathering grade:W4
Fayalite (mol%):32
Classifier:K.-L.N. Bell
Type spec mass (g):4.6
Type spec location:Monash
Main mass:Monash
Finder:D. Bradley
Comments:Submitted by K.-L.N. Bell, A. Tomkins
Institutions
   and collections
Monash: Building 28 School of Geosciences Monash University Victoria 3800 Australia, Australia (institutional address; updated 12 Dec 2012)
Catalogs:
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
Find references in NASA ADS:
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Geography:

Australia
Coordinates:
     Recommended::   (30° 30'S, 131° 28'E)

Statistics:
     This is 1 of 235 approved meteorites from South Australia, Australia (plus 2 unapproved names) (plus 4 impact craters)
     This is 1 of 704 approved meteorites from Australia (plus 45 unapproved names) (plus 27 impact craters)
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