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Antarctica 001
Basic information Name: Antarctica 001
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1992 or 1993
Country: Antarctica [Collected by a pilot supporting ANSMET]
Mass:help 2.3 kg
Classification
  history:
Recommended:  L/LL4    [explanation]

This is 1 of 21 approved meteorites classified as L/LL4.   [show all]
Search for other: L chondrites, L/LL chondrites, L/LL chondrites (type 4-7), LL chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 1 Jan 2020
Writeuphelp
Writeup from MB 109:

Antarctica 001

Antarctica

Find: 1992-1993

Classification: Ordinary chondrite (L/LL4)

History: Two fragments weighing 1904 g and 399 g were collected by a Canadian pilot supporting ANSMET searching during the 1992-93 season, from an unspecified location within Antarctica.

Physical characteristics: Both masses have little fusion crust and show well-defined chondrules. Iron staining is prevalent. The two masses fit together.

Petrography: (C. Herd, UAb) Optical and microprobe examination of a polished thin section of each fragment shows well-defined chondrules in a fine-grained, clastic matrix. Chondrule glass was sought but not found, although equilibration is locally variable based on microprobe results. Sharp optical extinction with < 2° angular variation in olivine. Minor iron staining is present locally. Weathering grade according to Zurfluh et al. (2016); shock stage according to Fritz et al. (2017).

Geochemistry: (C. Herd, UAb) Data obtained by EMP examination of two carbon-coated thin sections consisting of 7 chips of the rock: Olivine Fa26.4±1.4 (n=157); Low-Ca Pyroxene Fs19.1±4.0Wo1.2±1.1 (n=85).

Classification: Ordinary chondrite, L/LL4

Specimens: Entire specimens, including two thin sections are at UAb. Difference between recovered weight and type specimen is due to cutting losses.

Bibliography:
  • F.J. Zurfluh, B.A. Hofmann, E. Gnos, U. Eggenberger, and A.J.T. Jull (2016) Weathering of ordinary chondrites from Oman: Correlation of weathering parameters with 14C terrestrial ages and a refined weathering scale. Meteorit. Planet. Sci. 51, 1685–1700. (link)
  • Fritz J., Greshake A., and Fernandes V.A. (2017) Revising the shock classification of meteorites. Meteorit. Planet. Sci. 52, 1216-1232. (link)
Data from:
  MB109
  Table 0
  Line 0:
Date:1992-1993
Mass (g):2303
Pieces:2
Class:L/LL4
Shock stage:S1
Weathering grade:W1.0
Fayalite (mol%):26.4± 1.4 (n=157)
Ferrosilite (mol%):19.1± 4.0 (n=85)
Wollastonite (mol%):1.2± 1.1 (n=85)
Classifier:C. Herd, UAb
Type spec mass (g):2288.7
Type spec location:UAb
Main mass:UAb
Comments:Field numbers A1 and A2; 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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Antarctica
Coordinates:Unknown.

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)

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