Computer Science
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..86..113p&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 86, no. 1, Nov. 1987, p. 113-121.
Computer Science
7
Abundance, Earth Core, Geochemistry, Grain Size, Sediments, Vapor Deposition, High Temperature, Metamorphism (Geology), West Germany
Scientific paper
Samples from six levels within the so-called 'Graded Unit' (GU) from the research borehole Noerdlingen in the Ries Crater, Germany, characterized by different mean grain sizes, were analyzed for Ir, Ni, Co, Cr, and Fe. Composite samples from the inner parts of coarse crystalline clasts from the GU (at 330.0 m) and from suevite (340.8 m) were used as reference samples for indigenous concentrations of these elements. The concentration of Ir was found to decrease systematically with depth within the GU, (with the enrichment factor of 28 in the uppermost layer). This is in qualitative agreement with an interpretation of the GU as impact debris sorted by settling through the explosion plume, when some vaporized projectile material would be expected to condense onto the settling grains.
Horn Peter
Pernicka Ernst
Pohl J. J.
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