Lunar Meteorites: Dhofar 925, 960, & 961 (paired stones)

Oman



A slice of Dhofar 961. Tick marks are spaces at 1 mm. Click on image for enlargement.
(photo by Randy Korotev)


Sawn face of Dhofar 961
(photo courtesy of Tony Irving)


Exterior of Dhofar 961
(photo by Randy Korotev)


Two sides of a slice of Dhofar 925. Tick marks are spaces at 1 mm. Click on image for enlargement. Despite the textural similarity between our samples of Dhofar 925 and Dhofar 961, Dhofar 961 is much more mafic and richer in incompatible elements.
(photos by Randy Korotev)

 

A different slice of Dhofar 960. Click on image for enlargement. Thanks to Doug Ross for the sample.
(photo by Randy Korotev)


Slice and chips of Dhofar 960. Thanks to Norbert Classen for the sample.
(photo by Randy Korotev)

End piece of Dhofar 960. 1 cm cube for scale.
(photo courtesy of Michael Blood)
  


Compositionally and texturally, our samples of Dhofar 925 and Dhofar 960 are just like SaU 449, allegedly collected ~210 km to the north. That's probably too far apart for the stones to be paired, unless the stones have or have been moved since they fell.

Our sample of Dhofar 961 is different from Dhofar 925 and 960. The meteorite is coarse-grained and heterogeneous. Nevertheless, we believe it to be paired with the others

On the basis of composition and mineralogy, if we have a lunar meteorite from the giant South Pole-Aitken impact basin on the farside of the Moon, Dhofar 961 is the most likely candidate.
  


from The Meteoritical Bulletin, No. 88, Meteoritics & Planetary Science 39, A215–A272 (2004)

Dhofar 925

Oman 
Found: 2003 February 6
Mass: 49 g

Lunar meteorite (VLT basalt-bearing feldspathic impact melt breccia)

A grey stone weighing 49 g was found in the Dhofar region of Oman.

Mineralogy and classification (S. Demidova, M. Nazarov, Vernad., G. Kurat, NHMV): fusion crust is absent. The meteorite is an impact melt breccia; abundant mineral fragments and lithic clasts are set within a fine-grained impact melt matrix; the lithic clast population is dominated by impact melt breccias and granulitic rocks of anorthositic, troctolitic, noritic, and gabbronoritic compositions; the presence of VLT mare basalt clasts and rare KREEPy and granitic fragments is a characteristic feature of this meteorite; glass veins and fragments are common; feldspar, An2-98Or0-85; orthopyroxene, Wo2-5En49-90; clinopyroxene; Wo5-47En0.1-79, olivine, Fo0.5-93 (Fe/Mn ~ 87 at); accessory minerals are ulvöspinel, Ti-rich chromite, pleonaste, ilmenite (0.4-7.4 wt % MgO), silica, troilite, and abundant FeNi metal (0.6-24 wt% Ni; 0.1-1.5 wt% Co); K-Ba feldspar, whitlockite, Cl-apatite, baddeleyite, zircon, Zr-armalcolite, monazite, tranquillityite, and zirconolite occur in granitic clasts. One fragment of tschermakitic amphibole was found. The stone is moderately weathered; calcite, gypsum, celestite, barite, smectite and Fe hydroxides are present. The meteorite was found close to Dho 489 but the stones are very different in composition. Dho 489 does not contain any mare basalt material.

Specimens: type specimens of 10.1 g, and 2 thin sections, Vernad.; main mass with anonymous finder.
  


from The Meteoritical Bulletin, No. 89, Meteoritics & Planetary Science 40, A201–A263 (2005)

Dhofar 960

Oman 
Found: 2003 November 16
Mass: 35.4 g

Lunar meteorite (feldspathic impact melt breccia)

A grey stone weighing 35.4 g was found in the Dhofar region of Oman.

Mineralogy and classification (S. Demidova, Vernad., F. Brandstätter, NHMV): Fusion crust is absent. The meteorite is an impact melt breccia with abundant mineral fragments and lithic clasts set within a fine-grained impact melt matrix. The lithic clasts are impact melt breccias and granulitic rocks of anorthositic, gabbro-noritic, troctolitic, and noritic compositions. A presence of VLT mare basalt clasts, KREEPy and rare granitic fragments is a characteristic feature of the meteorite. Glass veins and fragments are common. Mineral compositions are as follows; plagioclase, An57-98Or0-6; orthopyroxene, Wo3-5En66-78; clinopyroxene; Wo5-43En0.4-73; olivine, Fo4-90 (Fe/Mn ~= 92 at); accessory minerals are ulvöspinel, Cr-rich ulvöspinel, Ti-rich chromite, Al-rich chromite, pleonaste, ilmenite (0.7-7.4 wt.% MgO), silica, troilite, FeNi metal (5-21 wt.% Ni; 0.3-0.7 wt.% Co); K-Ba feldspar, pyroxferroite, whitlockite, apatite, baddeleyite, Zr-armalcolite and Zr-rich phases. The stone is moderately weathered; calcite, gypsum, celestite, smectite and Fe hydroxides are present. The meteorite was found close to Dho 925 and they are similar in texture, petrography and mineral chemistry. The stones may be paired.

Specimens: type specimens of 7.4 g and 2 thin sections deposited at Vernad. The main mass is held by an anonymous finder.
  


from The Meteoritical Bulletin, No. 89, Meteoritics & Planetary Science 40, A201–A263 (2005)

Dhofar 961

Oman 
Found: 2003 November 12
Mass: 21.6 g

Lunar meteorite (feldspathic impact melt breccia)

A grey stone weighing 21.6 g was found nearby to the Dho 925 and 960 lunar meteorites in the Dhofar region of Oman.

Mineralogy and classification (S. Demidova, Vernad, F. Brandstätter, NHMV): the meteorite is similar to Dho 925 and 960 in texture, mineralogy and mineral chemistry and the stones may be paired.

Specimens: type specimens of 4.8 g and a thin section on deposit at Vernad. The main mass is held by an anonymous finder.
  



More Information

Meteoritical Bulletin Database

Dhofar 925 | 960 | 961

Lunar Meteorite Compendium

Dhofar 925/960/961

Map

Schematic Map of the Find Locations of the Dhofar Lunar Meteorites

References

Demidova S. I., Nazarov M. A., Kurat G., Brandstätter F., and Ntaflos T. (2005) New lunar meteorites from Oman: Dhofar 925, 960 and 961, In Lunar and Planetary Science 36, abstract no. 1607, Lunar and Planetary Institute, Houston.

Demidova S. I., Nazarov M. A., Lorenz C. A., Kurat G., Brandstätter F., and Ntaflos Th. (2007) Chemical composition of lunar meteorites and the lunar crust. Petrology 15 (4), 386-407.

Demidova S. I., Nazarov M. A., Brandstätter F., and Ntaflos Th. (2014) Mineralogical evidence for the activity of lunar water (abstract). 45th Lunar and Planetary Science Conference, abstract no. 1087.

Jolliff B. L., Zeigler R. A., Korotev R. L., and Carpenter P. K. (2007) Lunar meteorite Dhofar 961, mafic impact-melt breccia: Petrographic components and possible provenance (abstract). 70th Annual Meeting of the Meteoritical Society, abstract no. 5311. Lunar and Planetary Institute, Houston.

Jolliff B. L., Zeigler R. A., Korotev R. L., Carpenter P. K., Vicenzi E. P., and Davis J. M. (2008) Mafic impact-melt components in lunar meteorite Dhofar 961 (abstract). In Lunar and Planetary Science XXXIX, abstract no. 2519, 39th Lunar and Planetary Science Conference, Houston.

Jolliff B. L., Korotev R. L., Zeigler R. A., and Prettyman T. H. (2009) Connecting lunar meteorite Dhofar 961 to the South Pole-Aitken Basin through Lunar Prospector gamma-ray data (abstract). In Lunar and Planetary Science XL, abstract no. 2555, 40th Lunar and Planetary Science Conference, Houston.

Joy K. H., Kring D. A., and Zolensky M. E.. (2011) Petrography of lunar meteorites Dhofar 925 and 961 (abstract). 74th Annual Meeting of the Meteoritical Society, abstract no. 5100. Lunar and Planetary Institute, Houston.

Joy K. H., Nemchin A., Grange M., Lapen T. J., Peslier A. H., Ross D. K., Zolensky M. E., and Kring D. A. (2014) Petrography, geochronology and source terrain characteristics of lunar meteorites Dhofar 925, 961 and Sayh al Uhaymir 449. Geochimica et Cosmochimica Acta, 299-325, DOI: 10.1016/j.gca.2014.08.013.

Korotev R. L. (2005) Lunar geochemistry as told by lunar meteorites. Chemie der Erde 65, 297–346.

Korotev R. L. (2006) New geochemical data for a some poorly characterized lunar meteorites (abstract). In Lunar and Planetary Science XXVII, number 1404, Lunar and Planetary Institute, Houston.

Korotev R. L. (2011) Lunar meteorites from Antarctica and Oman (abstract). 74th Annual Meeting of the Meteoritical Society, abstract no. 5073. Lunar and Planetary Institute, Houston.

Korotev R. L. (2012) Lunar meteorites from Oman. Meteoritics & Planetary Science 47, 1365–1402. doi: 10.1111/j.1945-5100.2012.01393.x

Korotev R. L. and Zeigler R. A. (2007) Keeping up with the lunar meteorites (abstract). In Lunar and Planetary Science XXXVIII, abstract no. 1340, Lunar and Planetary Institute, Houston.

Korotev R. L., Zeigler R. A., and Jolliff B. L. (2007) Do we have a meteorite from the South Pole-Aitken basin of the Moon? (abstract). 70th Annual Meeting of the Meteoritical Society, abstract no. 5257. Lunar and Planetary Institute, Houston.

Korotev R. L., Zeigler R. A., Irving A. J., and Bunch T. E. (2009) Keeping up with the Lunar Meteorites — 2009 (abstract). In Lunar and Planetary Science XL, abstract no. 1137, 40th Lunar and Planetary Science Conference, Houston.

Korotev R. L, Zeigler R. A., Jolliff B. L., Irving A. J., and Bunch T. E. (2009) Compositional and lithological diversity among brecciated lunar meteorites of intermediate iron composition. Meteoritics & Planetary Science 44, 1287-1322.

Korotev R. L., Zeigler R. A., and Jolliff B. L. (2010) New geochemical constraints on pairing of the Dhofar 961 clan of lunar meteorites (abstract). In Lunar and Planetary Science XLI, abstract no. 2126, 41st Lunar and Planetary Science Conference, Houston.

Rochette P., Gattacceca J., Ivanov A. V., Nazarov M. A., and Bezaeva N. S. (2010) Magnetic properties of lunar materials: Meteorites, Luna and Apollo returned samples. Earth Planet. Sci. Lett., doi:10.1016/j.epsl.2010.02.007.

Zeigler R. A., Jolliff B. L., and Korotev R. L. (2010) Petrography and pairing relationships of lunar meteorites Sayh al Uhaymir 449 and Dhofar 925, 960, and 961 (abstract). In Lunar and Planetary Science XLI, abstract no. 1985, 41st Lunar and Planetary Science Conference, Houston.

Zeigler R. A., Korotev R. L., and Jolliff B. L. (2010) The Dhofar 961 meteorite group: A view into the interior of South Pole Aitken basin? (abstract). The 33rd Symposium on Antarctic Meteorites, Tokyo.

Zeigler R. A., Jolliff B. L., and Korotev R. L. (2013) Lunar meteorites Sayh al Uhaymir 449 and Dhofar 925, 960, and 961: Windows into South Pole Aitken Basin? (abstract). In 44th Lunar and Planetary Science Conference, abstract no. 2437.



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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-mailkorotev@wustl.edu

Last revised: 10-Nov-2014