By Y.P. Mel'nik, D.B. Vitaliano
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Extra info for Precambrian Banded Iron-Formations: Physicochemical Conditions of Formation
The iron and shaly horizons differ mainly in FezO, and AlzO, content; silica usually is higher in the shaly bands; differences in the content of such secondary components as TiO,, K 20,and S are fairly clearly noticeable; the FeO, MgO, and Na,O contents are similar. 5 in ;he shaly varieties. 5. The high iron content of the shaly horizons, in which the FeO content sometimes is even higher than in the associated banded iron-formation, is very remarkable, and some correlations, in particular of MgO and FeO, are also observed.
R. The granules are of complex mineralogic composition- they consist of iron silicates (greenalite, minnesotaite, and stilpnomelane) and cherty material and magnetite in highly variable proportions. Many granules contain tiny spherulites in their interior. In some cases the rocks containing the granules grade gradually into oolitic rocks in which the oolites are rimmed with hematite (Bayley and James (1973) give typical photomicrographs). 5 cm thick may pinch out in a distance of a few centimeters.
However, detailed study has shown that there often are transitions between cherty iron-formation related to volcanogenic complexes and cherty ironformation which at first glance has no such relationship. The existence of transitions has made it possible to postulate a remote indirect relationship to volcanism and to presume a volcanogenic source of the material even for those iron-chert complexes in which there are no volcanics at all. This point of view borders on the first group of hypotheses and requires an answer to a number of controversial partial questions of the problem: how is the formation of the iron cherts related to volcanism in space; does this relationship change in time, does the character of volcanism itself change, and how does this affect the accumulation of cherty iron sediments?
Precambrian Banded Iron-Formations: Physicochemical Conditions of Formation by Y.P. Mel'nik, D.B. Vitaliano