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Dhofar 1980
Basic information Name: Dhofar 1980
     This is an OFFICIAL meteorite name.
Abbreviation: Dho 1980
Observed fall: No
Year found: 2012
Country: Oman
Mass:help 23.5 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Lunar
Recommended:  Lunar    [explanation]

This is 1 of 89 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 15 Nov 2014
Writeuphelp
Writeup from MB 103:

Dhofar 1980 (Dho 1980)        19°0.643’N, 54°32.242’E

Zufar, Oman

Found: 2012 Dec

Classification: Lunar meteorite

History: Found during a foot search.

Physical characteristics: Six stones with masses of 5.8, 5.5, 4.9, 3.2, 3.2, and 0.9 g and ~2.5 to 1.5 cm in maximum size. Two stones contain significant dark, speckled fusion crust that cover most of one face of the respective stones. Shapes are angular to sub-rounded and colors range from grey, reddish, and tan with dark, sub-mm veins that connect melt pods. A 1.2-g slice of the 5.5-g stone shows a well consolidated rock with a brecciated texture of angular clasts that exhibit orange staining, and a few that are light colored. These clasts are set in a very fine-grained, gray groundmass that accounts for ~20 vol% of the sample.

Petrography: (A. Wittmann, WUSL) A 23.3 by 15.9 mm petrographic thin section exhibits a well consolidated, crystalline, melt rock that contains abundant angular, dark, apahnitic clasts, and light, angular to sub-rounded clasts that display rusty, orange staining. The complex, clast-rich, intergranular melt rock has a groundmass of 10 μm feldspar, olivine, and pyroxene, plus minor merrillite, FeNi metal, and troilite grains. Monomineralic clasts include <1 mm plagioclase, olivine, pyroxene, and spherical FeNi metal grains that are variably deformed and partly assimilated. Polymineralic clasts include dark, microcrystalline, intergranular lithic clasts that contain up to 100 μm mineral clasts of plagioclase; medium to fine-grained poikilitic lithic clasts with noritic and anorthositic mineralogies; medium-grained anorthositic clasts with granulitic textures; medium-grained anorthositic cumulate clasts of >0.3 mm feldspar with interstitial, poikilitic pyroxene and FeNi metal particles; and medium to fine-grained sub-ophitic domains of feldspar laths, zoned pigeonite, rhyolitic mesostasis, armalcolite, troilite, and FeNi metal intergrown with schreibersite. Silicate minerals frequently show reduced birefringence and intense brittle deformation. Many olivine and magnesian pyroxene clasts are extensively altered to phyllosilicates, and plagioclase shows orange staining in places. Other common alteration phases are SrSO4, CaSO4, CaCO3, and Fe-oxides that fill fractures; Fe-oxides also replace metal and troilite.

Geochemistry: Mineral compositions and geochemistry: (A. Wittmann, P. Carpenter, WUSL) Feldspar (Ab2.7-14.6An84-97Or0.1-1.9; n=21) is the most abundant component, followed by pyroxene that is mainly pigeonite (En61-75Fs20-31Wo5-14; Fe/Mn = 38-75; n=18), minor augite (En76-79Fs46-50Wo36-39; Fe/Mn = 41-48; n=3), and rare low-Ca pyroxene (En75-76Fs20-21Wo4.3-4.5; Fe/Mn = 55-58; n=2), and olivine that is mainly magnesian (Fo71-74; n=16; Fo66; n=1; Fe/Mn = 74-119). Minor components are rhyolitic mesostasis (SiO2 = 70%, K2O = 4%), Fe-Mg armalcolite (n=2) with 0.17% ZrO2, FeNi-metal (Ni = 4.4-5.9%, Co = 0.28±0.56%, n=5) and is in some cases associated with minor troilite and schreibersite (P = 12.6%, Ni = 10.6-14%, Co = 0.24-0.36%; n=2). Bulk composition (INAA, R. Korotev, WUSL): Na2O = 0.56, FeO = 5.8 (both in %), Ni = 475, Sr = 800, Sm = 7.3, and Th = 2.5 (all in ppm). Overall, indistinguishable from Dhofar 1627.

Classification: lunar (feldspathic breccia).

Specimens: Type specimen, ASU; TS and INAA samples at WUSL.

Data from:
  MB103
  Table 0
  Line 0:
State/Prov/County:Zufar
Origin or pseudonym:desert pavement
Date:2012 Dec
Latitude:19°0.643'N
Longitude:54°32.242'E
Mass (g):23.5
Pieces:6
Class:Lunar
Weathering grade:moderate
Classifier:A. Wittmann, B. Jolliff, P. Carpente, and R. Korotev, WUSL
Type spec mass (g):4.73
Type spec location:ASU
Main mass:anonymous finder
Finder:anonymous
Comments:Submitted by R. L. Korotev
Institutions
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
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° 0' 39"N, 54° 32' 15"E)

Statistics:
     This is 1 of 2131 approved meteorites from Zufar, Oman (plus 4 unapproved names)
     This is 1 of 3960 approved meteorites from Oman (plus 371 unapproved names)
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