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Dhofar 1673
Basic information Name: Dhofar 1673
     This is an OFFICIAL meteorite name.
Abbreviation: Dho 1673
Observed fall: No
Year found: 2011
Country: Oman
Mass:help 15.1 g
Classification
  history:
Meteoritical Bulletin:  MB 101  (2012)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 174 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 21 Sep 2012
Revised 18 Oct 2012: fix typo in loingitude
Writeuphelp
Writeup from MB 101:

Dhofar 1673 (Dho 1673)        18°42’40.4"N, 54°9’37.1"E

Zufar, Oman

Found: Jan 2011

Classification: Lunar meteorite (feldspathic breccia)

Petrography: (P. Strickland, UAb) Dominated by ferroan anorthosite and less frequent gabbroic clasts embedded in two distinct matrices. Olivine is rare and occurs in small amounts as fine grains. Ferroan anorthosite clasts are frequently seen with poikilitic pigeonite and augite, and some gabbro clasts have ophitic textures. The anorthosite clasts are embedded in a devitrified fine-grained matrix and fragment-rich feldspathic glassy impact melt matrix. A preferred orientation of clasts can be seen within these matrices. Clast sizes range from 0.05-1 mm, excluding the crystalline clasts which range up to 1.3mm. Other fragments consist of dark fine-grained impact-melt breccias and microporphyritic impact-melt breccias. High alumina, silica-poor (HASP) glass spherules range from 50 to 500 μm and seem to be mainly associated with the fine-grained matrix. Very few fractures are present, indicating low shock deformation. Minimal presence of calcite veins and oxidation indicate low weathering grade.

Geochemistry: (C. Herd and P. Strickland, UAb) Olivine Fa47.3±6.6 (n=10); low-Ca pyroxene Fs43.3±4.6Wo31.2±7.7 (n=16); augite Fs40.2±11.1Wo31.2±7.7 (n=27); plagioclase An96.2±1.2 (n=29); Ti-Cr-Spinel (all wt%) TiO2=21.6, Al2O3=3.92, Cr2O3=20.0, FeO=50.1, MgO= 1.6; HASP Glass (all wt%) SiO2=39.9-45.6, Al2O3=27.5-34.0.

Classification: Achondrite, Lunar Feldspathic Regolith Breccia. Classified as a regolith breccia rather than a fragmental breccia based on the presence of HASP glass spherules, as was observed in the mature regolith breccia QUE 93069 (Warren et al., 2005).

Specimens: 7.1 g type specimen, including polished thin section, are on deposit at UAb. Remainder at SQU.

Bibliography:
  • Warren P.H., Ulff-Moller F., and Kallemeyn G. W. (2005) "New" lunar meteorites: Impact melt and regolith breccias and large-scale heterogeneities of the upper lunar crust. Meteorit. Planet. Sci. 40, 989–1014. (link)
Data from:
  MB101
  Table 0
  Line 0:
State/Prov/County:Zufar
Date:Jan 2011
Latitude:18°42'40.4"N
Longitude:54°9'37.1"E
Mass (g):15.1
Pieces:1
Class:Lunar (feldsp. breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):47.3±6.6 (n=10)
Ferrosilite (mol%):43.3±4.6 (n=16)
Wollastonite (mol%):10.1±4.8
Classifier:C. Herd and P. Strickland, UAb
Type spec mass (g):7.1
Type spec location:UAb
Main mass:SQU
Comments:Field number O-61; Fs and Wo contents provided for low-Ca pyroxene, although augites were more abundant.; submitted by C. Herd
Institutions
   and collections
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
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Geography:

Oman
Coordinates:
     Recommended::   (18° 42' 40"N, 54° 9' 37"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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