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Hutchison Icefield 18034
Basic information Name: Hutchison Icefield 18034
     This is an OFFICIAL meteorite name.
Abbreviation: HUT 18034
Observed fall: No
Year found: 2019
Country: Antarctica [Collected by the Lost Meteorites of Antarctica project, UK]
Mass:help 0.81 g
Classification
  history:
Recommended:  Aubrite    [explanation]

This is 1 of 76 approved meteorites classified as Aubrite.   [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites
Comments: Approved 20 Dec 2021
Writeuphelp
Writeup from MB 110:

Hutchison Icefield 18034 (HUT 18034)        81°28.64683’S, 26°17.66250’W

Antarctica, Antarctica

Find: 2019 Jan 20

Classification: Enstatite achondrite (Aubrite)

History: The meteorite was recovered as part of the Lost Meteorites of Antarctica project, which was funded in the UK by the Leverhulme Trust and supported by the British Antarctic Survey and the University of Manchester. These samples were collected as part of the project’s first field season in austral summer December 2018 - January 2019 by a two person field party consisting of Katherine Joy and Julie Baum. Found on firn. Altitude 1152 m.

Physical characteristics: Mass: 0.81 g. Pieces: 1. Dimensions: 2 × 2 × 1 cm. An irregular, white-grayish part-stone with visible white grains (enstatite) and 40% black fusion crust. Several orange-brownish stained areas sometimes with silvery metallic grains are visible.

Petrography (J. L. MacArthur, K. H. Joy, R. Jones): The section consists of predominantly enstatite grains up to 3 cm in size in a brecciated matrix dominated by enstatite. Additional minerals include diopside (~8%), some containing abundant enstatite exsolution lamellae, ~4% feldspar, ~3% forsterite and occasional grains of Ti-bearing troilite, daubreelite and schreibersite.

Geochemistry: Mineral compositions and geochemistry (J. L. MacArthur, K. H. Joy, R. Jones): All analyses by EPMA. Olivine: forsterite Fo100±0 (N=7). Pyroxene: En98.9±0.4Fs0.0±0.0Wo 1.1±0.4 (N=10) and En55.9±1.2Fs 0.1±0.1Wo 44.0±1.2 (N=6). Plagioclase An5.0±4.6Ab92.0±3.8Or 3.0±0.9 (N=5). Oxygen Isotopes (J. Malley, R. Greenwood and R. Findlay, OU): One fragment was analyzed for oxygen isotopes by laser fluorination at OU. An ~18 mg homogenized sample yielded the following results (per mil deviation from VSMOW): δ17O=2.414, δ18O=4.531, Δ17O=0.058. Δ17O values are calculated using a slope of 0.52. The oxygen isotope analysis of the fragment plots close to the terrestrial fractionation line and is only slightly displaced from the aubrite analyses of Newton et al. (2000) and Barrat et al. (2016).

Classification: Aubrite

Specimens: 0.672 g type specimen (main mass) held at NHM .

Bibliography:
  • Barrat J-A., Greenwood R.C., Keil K., Rouget M.L. Boesenberg J. S., Zanda B. and Franchi I. A. (2016) The origin of aubrites: Evidence from lithophile trace element abundances and oxygen isotope compositions. Geochim. Cosmochim. Acta 192, 29-48. (link)
  • Newton J. Franchi I.A. and Pillinger C.T. (2000) The oxygen-isotopic record in enstatite meteorites. Meteorit. Planet. Sci. 35, 689-698 (link)
Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Antarctica
Origin or pseudonym:Hutchison 2 (north) Icefields
Date:2019 Jan 20
Latitude:81°28.64683'S
Longitude:26°17.66250'W
Mass (g):0.81
Pieces:2
Class:Aubrite
Weathering grade:low
Fayalite (mol%):0 (N=7)
Ferrosilite (mol%):0.0 (N=10); 0.1±0.1 (N=6)
Wollastonite (mol%):1.1±0.4 (N=10); 44.0±1.2 (N=6)
Classifier:J. L. MacArthur, K. L. Joy and R. H. Jones, UMan
Type spec mass (g):0.672
Type spec location:NHM
Main mass:NHM
Finder:Julie Baum
Comments:Field ID:000034 BAS ID: Z18.6.10; submitted by J. L. MacArthur, UMan
Plots: O isotopes:  
Institutions
   and collections
NHM: Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom; Website (institutional address; updated 9 Dec 2011)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
UMan: Department of Earth Sciences, University of Manchester, Oxford Road, Manchester, M139PL, United Kingdom (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos:
CreditPhotos
Public domain photographs:
Jane MacArthur      
Geography:

Antarctica
Coordinates:
     Recommended::   (81° 28' 39"S, 26° 17' 40"W)

Statistics:
     This is 1 of 43500 approved meteorites from Antarctica (plus 3802 unapproved names)
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