|Basic information||Name: Dhofar 1766|
This is an OFFICIAL meteorite name.
Abbreviation: Dho 1766
Observed fall: No
Year found: 2011
Mass: 292 g
This is 1 of 116 approved meteorites classified as Lunar (feldsp. breccia). [show all]
Search for other: Lunar meteorites
|Comments:||Approved 11 Dec 2013|
Writeup from MB 102:
Dhofar 1766 (Dho 1766) 18.592°N, 54.271°E
Found: 2011 Dec 9
Classification: Lunar meteorite (feldspathic breccia)
History: Found by a prospector in December 2011.
Physical characteristics: Angular 5 × 4 × 3 cm stone (292 g) with shiny, reddish exposure surface and bluish-grey basal surface. On surface ~5 mm rounded, knobby, yellowish-white to dark grey, partly melted clasts are embedded in a flow-textured groundmass, which has abundant, sub-mm vesicles.
Petrography: (A. Wittmann and P.Carpenter, WUSL) Melt rock with flow texture of aphanitic melt enclosing 5 to <0.5 mm size clasts of feldspar-rich rocks. All clasts are recrystallized but retain outlines of original textures of poikilitic to subhedral mafic silicates in plagioclase-dominated groundmass. Groundmass plagioclase forms dense masses of tabular, felty textured crystals with <10 μm skeletal pyroxene crystals filling interstices. Olivine occurs up to 50 μm, zoned, subhedral crystals in the melt groundmass, and in partly assimilated clasts is overgrown with augite that poikilitically encloses acicular plagioclase, silica-rich mesostasis and euhedral, up to 30 μm armalcolite crystals. Accessory troilite occurs in the melt groundmass as round to oval, <10 μm crystals, some of which are intergrown with minute taenite and tetratenite grains; subhedral to granular, 30 to 250 μm chromian spinel crystals exhibit variable ° of decomposition and recrystallization. Abundant vesicles are hollow or occupied by secondary gypsum, celestite, rare barite, and greenish-yellow, Mg-rich phyllosilicates (talc?) that are rimmed by celestite.
Geochemistry: (A. Wittmann, WUSL): Plagioclase (An77-96Ab13.9-3.4Or0-0.7; N=21); olivine (Fa10-30, molar Fe/Mn=61-195; N=20); augite (Fs10-21Wo24-42, molar Fe/Mn=34-40; N=3); armalcolite (up to 0.4 wt% ZrO2; n=6); spinel (Mg3.65–4.84Al6.48–12.77Fe3.24–4.57Ti0.37–0.65Cr2.57–8.44O32 ; n=3), troilite (up to 0.3 wt.% Ni; N=3), metal (36.5-45.5 wt% Ni, 1.3-1.4 wt% Co). Bulk composition (R. Korotev, WUSL) INAA of subsamples gave mean abundances of (in wt.%) FeO 2.9, Na2O 0.69, CaO 16, (in ppm) Sc 4.6, La 1.2, Sm 0.58, Eu 1.6, Yb 0.36, Th 0.08, and 1.1 ppb Ir.
Classification: Lunar (feldspathic melt rock).
Specimens: 20.3 g of type material and one polished thin section are at UWB. The remaining material is held by the anonymous finder.
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
|References:||Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015|
This is 1 of 2034 approved meteorites from Zufar, Oman (plus 3 unapproved names)
This is 1 of 3826 approved meteorites from Oman (plus 300 unapproved names)
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