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Dhofar 1983
Basic information Name: Dhofar 1983
     This is an OFFICIAL meteorite name.
Abbreviation: Dho 1983
Observed fall: No
Year found: 2011
Country: Oman
Mass:help 56.3 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 175 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 28 Dec 2014
Writeuphelp
Writeup from MB 103:

Dhofar 1983 (Dho 1983)        18°42.682’N, 54°9.438’E

Zufar, Oman

Found: Jan 2011

Classification: Lunar meteorite (feldspathic breccia)

Physical characteristics: Dark brown fusion crust with an orange tint covers the sample. Fracture surfaces have light orange colorations due to minor weathering. Cut section shows a clast-rich gray interior with white and gray clasts ranging from 0.5 to 10 mm in diameter. There are no obvious signs of oxidation of the interior with the exception a single orange veinlet.

Petrography: (P. Strickland and C. Herd, UAb). Petrographic microscope examination of thin section. Dominated by ferroan anorthosite and less frequent gabbroic clasts embedded in two distinct matrices. Melt breccia clasts up to 1 cm across are present, as are much smaller mineral fragments of pyroxene and less commonly, olivine. Glassy spherules approximately 100 μm are also present. Clasts and spherules are embedded in either a lighter, devitrified fine-grained matrix, or a less abundant, darker, glassy melt matrix. A preferred orientation of clasts is not observed. Very few fractures are present, indicating low shock deformation. Minimal presence of calcite veins and oxidation indicate low weathering grade.

Geochemistry: EPMA examination of carbon-coated thin sections (C. Herd and P. Strickland, UAb; T. Theye, UStutt; P. Hill, UWO): Olivine Fa20.0-45.8 (n=28); low-Ca pyroxene Fs16.2-82.4Wo2.6-19.3 (n=30); augite Fs10.3-57.8Wo17.6-43.6 (n=26); plagioclase An90.6-98.3 (n=53). Bulk composition (R. Korotev, WUSL): INAA of subsamples give mean abundances of (in wt.%) FeO 5.6, Na2O 0.369, CaO 15.2, and (in ppm) Sc 11.7, La 2.3, Sm 1.17, Eu 0.79, Yb 1.01, and Th 0.37. Oxygen isotopic composition (A. Ali and N. Banerjee, UWO): δ17O = 2.6±0.3 ‰, δ18O = 5.1±0.5 ‰, Δ17O = -0.03±<0.01 ‰ (n=2; unleached specimens).

Classification: Achondrite, lunar feldspathic regolith breccia.

Specimens: 11.4 g type specimen, including polished thin section and 0.3 g bulk powdered sample, are on deposit at UAb. A 0.55 g slice of the type specimen was used for INAA by Korotev. Remainder at SQU.

Data from:
  MB103
  Table 0
  Line 0:
State/Prov/County:Zufar
Date:Jan 2011
Latitude:18°42.682'N
Longitude:54°9.438'E
Mass (g):56.3
Pieces:1
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):20.0-45.8 (n=28)
Ferrosilite (mol%):16.2-82.4 (n=30)
Wollastonite (mol%):2.6-19.3 (n=30)
Classifier:C. Herd and P. Strickland (UAb), T. Theye (UStutt), P. Hill (UWO) and R. Korotev (WUSTL)
Type spec mass (g):11.4
Type spec location:UAb
Main mass:SQU
Comments:Field number O-30. Fs and Wo contents reported in data table are for low-Ca pyroxene only.; submitted by C. Herd
Plots: O isotopes:  
Institutions
   and collections
UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
SQU: Sultan Qaboos University, College of Science, Earth Sciences Department, P.O. Box 36 Code 123 Al­Khoud, Oman (institutional address; updated 5 Oct 2014)
UStutt: Universität Stuttgart, Institut für Mineralogie und Kristallchemie, Azenbergstraße 18, D-70174 Stuttgart , Germany (institutional address; updated 3 Aug 2014)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography:

Oman
Coordinates:
     Recommended::   (18° 42' 41"N, 54° 9' 26"E)

Statistics:
     This is 1 of 2119 approved meteorites from Zufar, Oman (plus 4 unapproved names)
     This is 1 of 3944 approved meteorites from Oman (plus 371 unapproved names)
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