Abstract
Nodular silica concentrations reminiscent of evaporite bodies have been observed in the Late Precambrian (Riphean) Porsangerfjord Group in western Porsangerfjord, northern Norway. The nodules are individual or coalescent kidney-shaped bodies measuring a few centimetres across, and consist predominantly of megaquartz and of length-slow chalcedony. Length-fast chalcedony occurs only as a red layer present in some large nodules. Relics of a fibrous, felted or radiating texture are preserved in numerous crystals of megaquartz and quartzine. The quartz nodules are interpreted as silica-replaced, early diagenetic evaporite (anhydrite) bodies. The paleoclimatic importance of these Precambrian evaporites is briefly discussed and the significance of length-slow chalcedony as an indicator of evaporite environments is confirmed.
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