Lunar Meteorite: Dhofar 026 clan

Oman

The Dhofar 026 clan consists of Dhofar 026, 457 through 468, and 1669

Dhofar 026. Photo credit: Vernadsky Institute

Two sides of a small slab of Dhofar 026. Tick mark spacing: 1 mm. Photo credit: Randy Korotev

Dhofar 4xx stones in the field. Note the ventifact shape (wind ablation) of 457, 461, 464, and 465. Photo credit: Luc Labenne

Slices of 4 of the Dhofar 026 clan stones. Photo credit: Norbert Classen

Two sides of Dhofar 457. Photo credit: ?

Dhofar 1669 in the field (left; photo credit: anonymous finder) and a slice thereof (right, photo credit: Norbert Classen

Lab sample of Dhofar 1669. Photo credit: Randy Korotev

from The Meteoritical Bulletin No. 84

Dhofar 026

Oman
Found: 2000 March 6
Mass: 148 g

Lunar meteorite (anorthositic crystalline melt breccia)

A brownish gray stone weighing 148 g was found in the Dhofar region of Oman.

Mineralogy and classification (M. Nazarov and M. Ivanova,Vernad): fusion crust absent; meteorite is a clast-poor, anorthositic, crystalline melt breccia containing rare mineral fragments and clasts of feldspathic rocks embedded in a completely devitrified fine-grained matrix; vesicles are abundant; sphere-shaped, chondrule-like inclusions and rare impact melt veins are present; feldspar, An96-98; olivine (a dominant mafic phase), Fo61-79(Fe/Mn = 80-120 at.); low-Ca pyroxene, En53-63Wo8-20(with 0.13-0.84 wt% TiO2, Fe/Mn = 40-60 at.); high-Ca pyroxene, En43-50Wo27-33(with 1.1-3.5 wt% TiO2, Fe/Mn = 40-50 at.); accessory minerals are silica, ilmenite (MgO = 7 wt%), troilite, and FeNi metal; a prominent positive Eu anomaly (Sm/Eu = 1.04) is present; terrestrial weathering is not significant. The meteorite is completely different in texture and composition from Dhofar 025, but pairing must still be considered due to the proximity of the finds to one another.*

Specimens:type specimen, 41 g plus two thin sections,Vernad; main mass with anonymous finder.

*Randy’s note: The find locations are separated by 20 km. On the basis of composition and cosmic-ray exposure histories, the meteorites are not paired.

from The Meteoritical Bulletin, No. 89

Name Date Latitude
S
Longitude
E
Mass (g) Pieces Type (g) Type
Dho 457 04/03/2001 18°14.901′ 54°00.096′ 99.5 1 1.64 UCLA
Dho 458 04/03/2001 18°14.917′ 54°00.145′ 36.7 1 1.00 UCLA
Dho 459 04/03/2001 18°14.914′ 54°00.202′ 31.5 1 1.68 UCLA
Dho 460 04/10/2001 18°14.965′ 54°00.436′ 73.1 1 9.16 MNB*
Dho 461 04/22/2001 18°14.682′ 53°59.868′ 33.7 1 3.03 UCLA
Dho 462 04/22/2001 18°14.800′ 54°00.113′ 44.7 1 1.97 UCLA
Dho 463 04/22/2001 18°14.808′ 54°00.145′ 24.3 1 2.85 UCLA
Dho 464 04/23/2001 18°14.976′ 53°59.662′ 22.3 1 1.17 UCLA
Dho 465 04/23/2001 18°14.833′ 54°00.377′ 70.7 1 2.58 UCLA
Dho 466 04/26/2001 18°14.814′ 53°59.772′ 69.2 1 2.17 UCLA
Dho 467 07/11/2001 18°15.226′ 54°00.046′ 36.2 1 1.17 UCLA
Dho 468 07/12/2001 18°15.390′ 53°59.525′ 18.9 1 0.91 UCLA

*Museum für Naturkunde Berlin

from The Meteoritical Bulletin, No. 101

Dhofar 1669

Zufar, Oman
Found: 2010 Nov 19
Mass: 3.3 g

Lunar meteorite (feldspathic breccia)

History: Found by an anonymous prospector on November 19, 2010.

Physical characteristics: A single gray stone (3.3 g) without fusion crust.

Petrography: (A .Irving and S. Kuehner, UWS) Very fine grained breccia composed of abundant anorthite with olivine, pigeonite, subcalcic augite, Ti-rich chromite, troilite, kamacite and a Cr-Ni-Fe phase.

Geochemistry: Olivine (Fa38.8-39.6, FeO/MnO = 106-109), pigeonite (Fs28.8Wo8.1, FeO/MnO = 50), subcalcic augite (Fs17.4Wo33.4, FeO/MnO = 50), plagioclase (An96.0-97.2Or0.1).

Classification: Lunar (feldspathic breccia).

Specimens: A total of 0.66 g of type material is on deposit at WUSL (0.53 g) and UWB (0.13 g). The main mass is held by an anonymous collector.

Randy Says…

Compositionally, the Dhofar 026 clan is a typical feldspathic lunar meteorite. Dhofar 1669 was found about twice the distance from Dhofar 026 as were the Dhofar 457–468 stones. Dhofar 1669 was found nearer to the find location of the Dhofar 025 clan and Dhofar 287, but the Dhofar 025 clan is compositionally distinct (Korotev, 2012) and Dhofar 287 is a mare basalt. Figure S4 of Korotev 2017.

More Information

Meteoritical Bulletin Database

Dhofar 026| 457| 458| 459| 460| 461| 462| 463| 464| 465| 466| 467| 468| 1669

Map

Schematic Map of  Find Locations of  Lunar Meteorite from Oman

References

Cohen B. A., Taylor L. A., and Nazarov M. A. (2001) Lunar meteorite Dhofar 026: A second-generation impact melt. Lunar and Planetary Science XXXII, abstract no. 1404.

Cohen B. A., Swindle T.D., Taylor L.A., and Nazarov M.A. (2002) 40Ar-39Ar ages from impact melt clasts in lunar meteorites Dhofar 025 and Dhofar 026. Lunar and Planetary Science XXXIII, abstract no. 1252.

Cohen B. A., James O. B., Taylor L. A., Nazarov M. A., and Barsukova L. D. (2004) Lunar highland meteorite Dhofar 026 and Apollo sample 15418: Two strongly shocked, partially melted, granulitic breccias. Meteoritics & Planetary Science 39, 1419-1447.

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.

Fritz J. (2012) Impact ejection of lunar meteorites and the age of Giordano Bruno. Icarus 221, 1183-1186.

James O. B., Cohen B. A., and Taylor L. A. (2003) Lunar meteorite Dhofar 026: A shocked granulitic breccia, not an impact melt. Lunar and Planetary Science XXXIV, abstract no. 1149.

James O. B., Cohen B. A., Taylor L. A., Nazarov M. A. (2007) Comment on: “New” lunar meteorites: Impact melt and regolith breccias and large-scale heterogeneities of the upper lunar crust, by P. H. Warren, F. Ulff-Moller, and G. W. Kallemeyn. Meteoritics & Planetary Science 42, 1029-1032.

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

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

Korotev R. L. (2012) Lunar meteorites from Oman. Meteoritics & Planetary Science 47, 1365-1402.

Korotev R. L. (2017) Update (2012–2017) on lunar meteorites from Oman. Meteoritics & Planetary Science 52, 1251-1256.

All Korotev data on Omani lunar meteorites.

Korotev R. L. and Irving A. J. (2013) Keeping up with the lunar meteorites 2013. 44th Lunar and Planetary Science Conference, abstract no. 1216.

Korotev R. L., Jolliff B. L., Zeigler R. A., Gillis J. J., and Haskin L. A. (2003) Feldspathic lunar meteorites and their implications for compositional remote sensing of the lunar surface and the composition of the lunar crust. Geochimica et Cosmochimica Acta 67, 4895-4923.

Nazarov M. A., Badyukov D. D., Lorents K.A., Demidova. S. I. (2004) The flux of lunar meteorites onto the Earth. Solar System Research 38, 49-58.

Nishiizumi K. (2003) Exposure histories of lunar meteorites. Evolution of Solar System Materials: A New Perspective from Antarctic Meteorites, 104.

Nishiizumi K. and Caffee M. W. (2001) Exposure histories of lunar meteorites Dhofar 025, 026, and Northwest Africa 482. 64th Annual Meeting, Meteoritical Society, abstract no. 5411.

Nishiizumi K., Hillegonds D. J., McHargue L. R., and Jull A. J. T. (2004) Exposure and terrestrial histories of new lunar and martian meteorites, In Lunar and Planetary Science XXXV, abstract no. 1130.

Schiller M., Bizzarro M., and Fernandes V. A. (2018) Isotopic evolution of the protoplanetary disk and the building blocks of Earth and the Moon. Nature 555, 507-510.

Shukolyukov Y. A., Nazarov M. A., Pätsch M., and Schultz L. (2001) Noble gases in three lunar meteorites from Oman. Lunar and Planetary Science XXXII, abstract no. 1502.

Taylor L. A., Nazarov M. A., Cohen B. A., Warren P. H., Barsukova L. D., Clayton R. N., and Mayeda T. K. (2001) Bulk chemistry and oxygen isotopic compositions of lunar meteorites Dhofar 025 and Dhofar 026: A second-generation impact melt. Lunar and Planetary Science XXXII, abstract no. 1985.

Warren P. H., Taylor L. A., Kallemeyn G., Cohen B. A., Nazarov M. A. (2001) Bulk-compositional study of three lunar meteorites: Enigmatic siderophile element results for Dhofar 026. Lunar and Planetary Science XXXII, abstract no. 2197.

Warren P. H., Ulff-Møller F., and Kallemeyn G. W. (2005) “New” lunar meteorites: Impact melt and regolith breccias and large-scale heterogeneities of the upper lunar crust. Meteoritics & Planetary Science 40, 989-1014.

Zhang A.-C., Hsu W.-B., Li X.-H., Ming H.-L., Li Q.-L., Liu Y, and Tang G.-Q. (2011) Impact melting of lunar meteorite Dhofar 458: Evidence from polycrystalline texture and decomposition of zircon. Meteoritics and Planetary Science 46, 103-115.

Zhang A., Hsu W., Li X., Ming H., Li Q., Liu Y., and Tang G. (2011) Polycrystalline zircon in lunar meteorite Dhofar 458: Origin and implications. 42nd Lunar and Planetary Science Conference, abstract no. 2805.

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