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A multi-element study of ISUA iron-formation, W-GreenlandMeta-sediments from Isua, West Greenland were analyzed by instrumental thermal neutron activation analysis (ITNAA). These sediments are chemical precipitates having some layers of remarkably high Cr content. The latter were compared to Cr poor layers. It turned out that the Cr enriched layers had higher Ir and Ni contents than the samples from the Cr poor layers. Compared to phanerozoic samples the highest Ir contents are not extraordinarily higher than in a modern sediment, and the Cr poor layers, representing more or less phanerozoic shale. From the cratering record of the Moon one can assume a similar cratering of the Earth at about the time when the Isua rocks were formed.
Document ID
19840012893
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rast, U. (Max-Planck-Inst. fuer Chemie Mainz, Germany)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Publication Information
Publication: Lunar and Planetary Inst. Workshop on a Cross Section of Archean Crust
Subject Category
Geophysics
Accession Number
84N20961
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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