Abstract
Tiny chromite grains were found in various facies of a banded iron-formation in the Isua supracrustal belt, West Greenland. The chromites have a peculiar composition with 0.1 % MgO. The Isua chromites resemble in size meteoritic chromite grains found in modern deep-sea sediments. The depositional environment of the Isua iron-formation indicates that the chromites are not likely to be of authigenic, detrital, or volcanic origin. It is suggested that the chromites represent the earliest traces of meteoric material found on Earth.
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