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Dhofar 1982
Basic information Name: Dhofar 1982
     This is an OFFICIAL meteorite name.
Abbreviation: Dho 1982
Observed fall: No
Year found: 2013
Country: Oman
Mass:help 6 kg
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  L5
Recommended:  L5    [explanation]

This is 1 of 6534 approved meteorites (plus 4 unapproved names) classified as L5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 11 Dec 2014
Writeuphelp
Writeup from MB 103:

Dhofar 1982 (Dho 1982)        19°11.87’N, 54°54.17’E

Zufar, Oman

Found: January 2013

Classification: Ordinary chondrite (L5)

History: Collected by SQU-UWO meteorite research team in January 2013

Physical characteristics: Physical Characteristics: A 1205.76 g sample supplied by SQU, which has a 2-mm thick, brown-black fusion crust present on three out of five faces of the stone. Regmaglypts and contraction cracks are present on the surface of the fusion crust. This specimen has undergone extensive terrestrial weathering. This sample has been split in two, most likely due to weathering. The sample is magnetic.

Petrography (P. Hill, UWO) Many chondrules can be discerned, but lack sharp edges. Most of the chondrules are fairly large (~0.7 mm) with many of the non-porphyritic chondrules exceeding 1 mm in diameter. A majority of the chondrules are porphyritic olivine-pyroxene but porphyritic pyroxene chondrules also make up significant portion of the chondrules. Porphyritic olivine, radial pyroxene, granular and cryptocrystalline chondrules are present but occur less frequently throughout the thin section. The entire chondrite has been strongly oxidized, with rust present on all mineral phases present. A large amount of deformation is evident, and fractures ~100 μm wide cut across the thin section. There is evidence of brecciation. The matrix has been completely recrystallized with secondary feldspar common throughout the thin section. Troilite is present primarily as inclusions within the chondrules and Fe-Ni oxide rims but also as coarser grains. All of the Fe-Ni metal has been oxidized within the thin section but there is little evidence of weathering of silicate minerals, indicating weathering grade W3. Weak mosaicism, planar fractures and undulatory extinction in olivine suggest shock stage S4.

Geochemistry: Mineral composition and geochemistry (M. Beauchamp, P. Hill, UWO) Olivine (Fa22.3±0.65, n=30) with PMD Fa=1.8%, low-Ca pyroxene (Fs18.9±0.67Wo1.5±1.02, n=13) with PMD Fs=3.1%. The high-Ca pyroxene was observed is suggestive of augite composition of (Fs5.5±5.0Wo23.9±16.3, n=2)

Classification: Ordinary chondrite (L5, S4, W3).

Specimens: 6078 g type specimen, including polished thin section, are on deposit at SQU.

Data from:
  MB103
  Table 0
  Line 0:
State/Prov/County:Zufar
Origin or pseudonym:Desert plain
Place of purchase:SQU
Date:January 2013
Latitude:19°11.87’N
Longitude:54°54.17’E
Mass (g):6000
Pieces:2
Class:L5
Shock stage:S4
Weathering grade:W3
Fayalite (mol%):22.3±0.7
Ferrosilite (mol%):18.9±0.7; 5.5±5.0
Wollastonite (mol%):1.5±0.3; 23.9±16.3
Classifier:P. Hill, N. Banerjee, G. Osinski, UWO; S. Nasir, SQU
Type spec mass (g):6078
Type spec location:SQU
Main mass:SQU
Finder:SQU-UWO team
Comments:Fileld No SQU -22; submitted by P. Hill
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)
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. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography:

Oman
Coordinates:
     Recommended::   (19° 11' 52"N, 54° 54' 10"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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