Computer Science
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981metic..16..261b&link_type=abstract
Meteoritics, vol. 16, Sept. 30, 1981, p. 261-267.
Computer Science
Carbonaceous Meteorites, Iron Meteorites, Melts (Crystal Growth), Meteoritic Composition, Meteoritic Microstructures, Shock Heating, Chromium Compounds, Crystal Structure, Nickel Compounds, Rock Mechanics, Shear Stress, Solidification, Sulfur Compounds, Meteorites, Iron Meteorites, Shock, Dendrites, Heating, Photomicrographs, Microstructure, Origin, Analysis, Cooling Rate, Melts, Haig Meteorite, Troilite, Chemistry, Microprobe, Daubreelite, Shear, Cohenite, Haxonite, Minerals, Morphology, Mixing, Deformatio
Scientific paper
The Haig (IIIA) iron meteorite material (BM 1968,280) in the Collection of the British Museum (Natural History) displays pre-terrestrial shear deformation which transects a small troilite-daubréelite-cohenite nodule. Five globular areas (< 1 mm) with dendritic structures indicating rapid solidification from melts occur within and around the larger part of the transected nodule. All shock deformation structures and shock-heating effects exhibited by Haig. are of pre-terrestrial origin and at least four successive alterations to the original structure are evident.
Partial bulk analyses of the melt globules indicate complex mixtures of approximately 55 wt % troilite, 24 wt % metal, 14 wt % daubréelite and 7 wt % cohenite. It is suggested that a compressive environment maintained the melts as discrete pools of liquid.
The diameters of the globules (< 0.5 mm) and spacing of the dendrite arms (< 1 μm) indicate solidification at > 106 °C sec-1 which is the fastest cooling rate yet recorded in meteorites.
Axon H. J.
Bevan Alex W. R.
Kinder Jesse
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