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Hutchison Icefield 18035
Basic information Name: Hutchison Icefield 18035
     This is an OFFICIAL meteorite name.
Abbreviation: HUT 18035
Observed fall: No
Year found: 2019
Country: Antarctica [Collected by the Lost Meteorites of Antarctica project, UK]
Mass:help 1.66 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 545 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 20 Dec 2021
Writeuphelp
Writeup from MB 110:

Hutchison Icefield 18035 (HUT 18035)        81°32.29267’S, 25°46.43950’W

Antarctica, Antarctica

Find: 2019 Jan 21

Classification: HED achondrite (Eucrite)

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 blue ice surface. Altitude 1269 m.

Physical characteristics: Mass: 1.66 g. Pieces: 1. Dimensions: 1.5 × 1.5 × 1 cm. An irregular, part stone with 40% shiny black fusion crust on two sides and sandy colored interior with white clasts.

Petrography: Brecciated composed of fragmented pyroxene and plagioclase grains, as well as granular igneous clasts comprised of pyroxene and plagioclase with a granular texture. Main minerals are pyroxene (up to 0.6 mm) with ubiquitous exsolution lamellae, and plagioclase (up to 0.7 mm). Minor silica, ilmenite, phosphate and chromite are present.

Geochemistry: Mineral compositions and geochemistry (J. L. MacArthur, K. H. Joy, R. Jones): All analyses by EPMA. Orthopyroxene Fs61.3±1.1Wo3.9±1.3 (N=44), clinopyroxene Fs33.6±5.3Wo36.6±6.1 (N=97). All pyroxene combined Fs42.2±13.7Wo26.4±16.1 (N=141). Plagioclase An86.8±1.5Ab12.6±1.5 (N=31). Average Fe/Mn (atomic) in orthopyroxene = 30.3±0.9 (N=44). Compositional ranges indicate this is a basaltic eucrite. 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=1.598, δ18O=3.485, Δ17O=-0.229. Δ17O value calculated using the linearized method of Miller (2002), with a slope value of 0.5247. This plots within ± 2? field for the HEDs as defined by Greenwood et al. (2017).

Classification: Eucrite (basaltic)

Specimens: 1.389 g type specimen (main mass) held at NHM.

Bibliography:
  • Greenwood R. C., Burbine T. H., Miller M. F. and Franchi I. A. (2017) Melting and differentiation of early-formed asteroids: The perspective from high precision oxygen isotope studies. Geochemistry 77, 1–43. (link)
  • Miller M.F. (2002) Isotopic fractionation and the quantification of 17O anomalies in the three oxygen isotope system: an appraisal and geochemical significance. Geochim. Cosmochim. Acta 66, 1881-1889 (link)
Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Antarctica
Origin or pseudonym:Hutchison 5 (south) Icefields
Date:2019 Jan 21
Latitude:81°32.29267'S
Longitude:25°46.43950'W
Mass (g):1.66
Pieces:1
Class:Eucrite
Weathering grade:low
Ferrosilite (mol%):61.3±1.1 (N=44); 33.6±5.3 (N=97).
Wollastonite (mol%):3.9±1.3 (N=44); 36.6±6.1 (N=97).
Classifier:J. L. MacArthur, K. L. Joy and R. H. Jones, UMan
Type spec mass (g):1.389
Type spec location:NHM
Main mass:NHM
Finder:Katherine Joy
Comments:Field ID:000035 BAS ID: Z18.11.1; 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° 32' 18"S, 25° 46' 26"W)

Statistics:
     This is 1 of 43331 approved meteorites from Antarctica (plus 3802 unapproved names)
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