Other
Scientific paper
Oct 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967saosr.251.....e&link_type=abstract
SAO Special Report #251 (1967)
Other
Scientific paper
Numerous magnetic spherules and grains collected from the Greenland ice were studied microscopically and with the microprobe. Seven types of spherules and grains were recognized. Several magnetite spherules contain metallic cores. The metallic cores of three spherules are composed of nearly pure αFe with traces of Ni. The metallic nuclei of two other spherules contain appreciable amounts of Ni; the nucleus of one of these is composed of a Ni-rich NiFe alloy (96.9% Ni) and that of the other contains 3% Ni. This latter spherule is probably of cosmic origin, perhaps formed in the fusion crust of an iron meteorite. The majority of the spherules consist of magnetite, which is more or less transected by martite lamellae parallel to {111} planes of the magnetite. A single composite grain of titanomagnetite, ilmenite, hematite, and pyroxene was also found. This grain is of terrestrial origin, probably derived from the metamorphic crystalline complex of Greenland. The mineralogy and chemistry the magnetite spherules and grains studied are also discussed in detail.
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