E&PS_WU_logo.jpg

 

Lunar Meteorite

Lynch 002

Australia

 

A fragment of Lynch 002

(photo credit: of Alex Bevan)

 

Small fragments of Lynch 002 in the lab
(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, no. 100, in prep.

Lynch 002

Western Australia, Australia
Found: 2010 September 25
Mass: 36.54 g

Lunar meteorite

History: A weathered mass was found on an open plain during systematic meteorite searching.

Physical characteristics: The 36.54 g irregularly shaped stone lacks fusion crust and measures 4 × 4 × 2 cm. It has a dark, desert-varnished surface.

Petrography: (C. L. Smith and A. T. Kearsley, NHM) The sample is highly brecciated from the micro to macro-scale, and contains numerous clasts in a heterogeneous, brecciated matrix. Melt veins, some containing blebs of Fe-Ni metal, are pervasive. Melt spherules are also observed. Larger clasts to ~1 mm are composed of basaltic lithologies, melt clasts, KREEP-rich clasts, and pyroxferroites. The matrix is brecciated and heterogeneous and is composed of mono and polymineralic fragments. Many of the smaller polymineralic fragments appear similar to the larger clasts. Matrix consists predominantly of pyroxene and feldspar. Irregularly shaped Fe-Ni metal grains (few micrometers to few tens of micrometers) occur and sulphide and schreibersite are also observed. Ilmenite grains are fairly abundant. Accessory phases include baddeleyite and silica. The sample is moderately fractured and carbonate veins fill cracks and voids. No fusion crust remains, although there is a distinct weathering rind preserved in some places.

Geochemistry: Representative large clasts; basaltic clast pyroxene (Fs24.5-41.8Wo6.1-34.3, Fe/Mn=58.4-74.3 and Fs18.9-72.2Wo4.9-24.1, Fe/Mn=51.1-77.6), plagioclase (An86.7-93.6Or0.4-2.5 and An88.3-92.1Or0.7-2.0); pyroxferroite clast (Fs45.0-58.8Wo21.5-39.0, Fe/Mn=71.5-96.8). Matrix low-Ca pyroxene (Fs20.4-74.9Wo1.6-17.8, Fe/Mn=47.8-76.3), high-Ca pyroxene (Fs6.6-70.1Wo20.5-51.4, Fe/Mn=40.0-96.0), plagioclase (An83.4-98.8Or0.0-1.5). All analyses by EPMA.

Oxygen Isotopes: I. A. Franchi (OU) δ17O = 3.638, 3.470 δ18O = 7.005, 6.676 Δ17O = -0.005, -0.002 all values in per mil. Bulk acid washed sample.

Classification: Achondrite, lunar breccia with moderate to high weathering.

Specimens: Main mass and one polished block at WAM.

 

Randy Says…

It's compositionally distinct from Calcalong Creek, the only other lunar meteorite from Australia, but similarly rich in incompatible elements like Th.  The chemical composition has been affected by terrestrial alteration more so than any other lunar meteorite. The two Australian lunar meteorites were found 859 km apart.

southwest_australia.jpg

 

More Information

Meteoritical Bulletin Database

Lynch 002

Map

Schematic Map of the Find Locations of the Dhofar Lunar Meteorites

References

Korotev R. L. (2013) Composition of Lynch 002 lunar meteorite (abstract). 76th Annual Meeting of the Meteoritical Society, abstract no. 5021.

Robinson K. L., Smith C. L., Kearsley A. T., Bevan A. W. R., and Anand M. (2016) The Lynch 002 lunar meteorite revisited. 46th Lunar and Planetary Science Conference, abstract no. 1470.

 

Smith C. L., Kearsley A. T., Bermingham K. R., Deacon G. L., Kurahashi E., Franchi I. A., and Bevan A. W. R. (2012) Lynch 002: A new lunar meteorite from the Nullarbor Desert, Western Australia (abstract). 75th Annual Meeting of the Meteoritical Society, abstract no. 5137.

 

 

 

Back to: Lunar Meteorites | List of Lunar Meteorites | Top of Page

 


Prepared by
: Randy L. Korotev
 
Department of Earth and Planetary Sciences
Washington University in St. Louis

Please don't contact me about the meteorite you think you've found until you read this and this.


e-mail
korotev@wustl.edu

Last revised: 5-Feb-2016