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Antarctica 004
Basic information Name: Antarctica 004
     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 70 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  L6
Recommended:  L6    [explanation]

This is 1 of 11485 approved meteorites (plus 6 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 23 Dec 2019
Writeuphelp
Writeup from MB 108:

Antarctica 004

Antarctica

Find: 1992-1993

Classification: Ordinary chondrite (L6)

History: A single specimen weighing 70 g was collected by a Canadian pilot supporting ANSMET searching during the 1992-93 season, from an unspecified location within Antarctica.

Physical characteristics: The single, rounded mass is covered in fusion crust and has minor iron staining. Interior surfaces show evidence for brecciation.

Petrography: (C. Herd, UAb) Optical and microprobe examination of a polished thin section shows a brecciated texture, including areas darkened by comminution, with poorly defined chondrules in a recrystallized matrix. Shock effects include strong mosaicism, PDFs and PFs in olivine. Minor iron staining is present throughout. 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 carbon-coated thin section: Olivine Fa24.5±0.7 (n=35); Low-Ca Pyroxene Fs20.9±0.4Wo1.5±0.2 (n=25).

Classification: Ordinary chondrite, L6

Specimens: Entire specimen, including one thin section is 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:
  MB108
  Table 0
  Line 0:
Date:1992-1993
Mass (g):70
Pieces:1
Class:L6
Shock stage:S5
Weathering grade:W1.0
Fayalite (mol%):24.5±0.7 (n=35)
Ferrosilite (mol%):20.9±0.4 (n=25)
Wollastonite (mol%):1.5±0.2 (n=25)
Classifier:C. Herd, UAb
Type spec mass (g):63.7
Type spec location:UAb
Main mass:UAb
Comments:Field number A5; 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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Antarctica
Coordinates:Unknown.

Statistics:
     This is 1 of 40719 approved meteorites from Antarctica (plus 4494 unapproved names)

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