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Patuxent Range 91501
Basic information Name: Patuxent Range 91501
     This is an OFFICIAL meteorite name.
Abbreviation: PAT 91501
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 8.55 kg
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 15(2)  (1992)  L7
Meteoritical Bulletin:  MB 76  (1994)  L7
NHM Catalogue:  5th Edition  (2000)  L7
MetBase:  v. 7.1  (2006)  L7
Recommended:  L7    [explanation]

This is 1 of 24 approved meteorites classified as L7.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 15(2):

Sample No.: PAT91501

Location: Patuxent Range

Field Number: 4742, 5482, 5772, 6254, 6261

Dimensions (cm): 19.1 x 14.3 x 14.5 plus many large fragments

Weight (g): 8550.6

Meteorite Type: L7 chondrite

 

Macroscopic Description: Robbie Marlow and Roberta Score

The exterior of this handsome green rock is extremely polished but no fusion crust remains on any of the many fragments collected. A minute amount of evaporite deposit lines some of the thin exterior fractures. Large (>1 cm) inclusions of copper-colored sulfides are scattered throughout this meteorite. One area shows a highly vesicular texture on both interior and exterior surfaces.

 

A 2 mm thick weathering rind was noted when PAT91501 was cleaved. The interior is coarse-grained, has a granular texture, and is very green in color.

 

The oxygen isotopic composition of PAT 91501,19 has been measured by T.K. Mayeda and R.N. Clayton, and is closest to that of L-chondrites. For PAT 91501, δ18O = +4.7‰, δ17O = +3.7‰, compared with the mean for L4, L5, and L6: δ18O = +4.70 ± 0.24, δ17O = +3.52 ± 0.14 (Clayton et al., Geochim. Cosmochim. Acta 55, 2317, 1991).

 

Thin Section (,26 & ,28) Description: Brian Mason

The sections show an equigranular aggregate of anhedral to subhedral olivine and pyroxene (average grain size 0.4 mm), with minor plagioclase and accessory nickel-iron and troilite. Plagioclase laths are larger than olivine and pyroxene (up to 3 mm long) and poikilitically enclose these minerals. Minor weathering is indicated by a small amount of limonitic staining in 91501,28. Microprobe analyses show the following compositions: olivine, Fa24; pyroxene, Wo2-6 Fs20; plagioclase, An12. The mineral compositions are characteristic of an L-group chondrite, but the absence of chondrules and the small amount of metal and troilite indicate complete recrystallization. The meteorite is therefore tentatively classified as an L7 chondrite; it resembles the Shaw meteorite (Geochim. Cosmochim. Acta, v. 31, p. 1705, 1967).

 

Data from:
  MB76
  Table 2
  Line 4785:
Origin or pseudonym:Brazitis Nunatak
Mass (g):8550.6
Class:L7
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):20
Comments:NTL=20.4±0.1
Plots: O isotopes:  
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References: Published in Antarctic Meteorite Newsletter 15(2) (1992), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
MeteoriteCollector.org - USNM - Smithsonian   
Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (84° 43'S, 64° 30'W)
     Recommended::   (84° 43'S, 64° 30'W)

Statistics:
     This is 1 of 38937 approved meteorites from Antarctica (plus 5051 unapproved names)
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