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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Length-Slow Chalcedony and Relicts of Sulphates--Evidences of Evaporitic Environments in the Upper Carboniferous and Permian Beds of Bear Island, Svalbard
Anna Siedlecka
ABSTRACT
Authigenic silica occurs in carbonate rocks of Upper Carboniferous and Permian age from Bear Island (Svalbard). Fibrous, length-slow spherulitic silica in the form of quartzine and/or lutecite, megaquartz and microcrystalline quartz have been differentiated. In the Carboniferous rocks (Fusulina Limestone Formation) all of these varieties of quartz reveal relict fibrous structure and inclusions of sulphates, while in the Permian (Spirifer Limestone Formation) no traces of sulphates were discernible. Association of length-slow fibrous silica (quartzine and/or lutecite) with sulphates is a commonly observed feature in the geological record and this particular variety was considered by Pittman and Folk (1970; 1971) as diagnostic of ancient evaporite environments.
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