Mathematics – Logic
Scientific paper
Apr 1961
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961gecoa..23....9c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 23, Issue 1-2, pp.9-60
Mathematics
Logic
13
Scientific paper
Cobalt has been determined in a wide variety of geologically interesting materials using the combined techniques of emission speotrography and neutron activation analysis. Neutron activation was used to analyse standards for the emission spectrograph and materials low in cobalt. The following table is a summary of the results obtained with these methods. During differentiation of a basaltic magma (as in the case of the Stillwater complex) most of the cobalt enters the ferromagnesian minerals. The cobalt content of these minerals depends on the total number of Fe-Mg lattice sites and is independent of the Fe/Mg ratio. This relationship appears to hold for basaltic rocks in general. Cobalt is strongly coherent with magnesium in granitic rocks and behaves like magnesium in its partition relations between metamorphic minerals. The acceptance of both cobalt and magnesium is more selective at lower grades of metamorphism. These observed coherence relations require a re-evaluation of the geochemical laws governing the distribution of trace elements in the petrogenesis of igneous and metamorphic rocks and the partition of trace elements between coexisting minerals. In sediments most of the cobalt is in the argillaceous fraction and seems to follow iron and maguaneae. The cobalt economy in the deep sea is discussed and we conclude that with present knowledge, the cobalt accumulations in deep-sea sediments may be explained as the result of supply of detritally associated cobalt and dissolved cobalt from surface runoff rather than volcanic exhalations. The crustal abundance of cobalt is calculated as 27 p.p.m. on the model of a crust of basalt and granodiorite in equal proportions.
Carr Michael H.
Turekian Karl K.
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