Silicification and bentonites in the Silurian of Gotland
作者:
Sven Laufeld,
Lennart Jeppsson,
期刊:
Geologiska Föreningen i Stockholm Förhandlingar
(Taylor Available online 1976)
卷期:
Volume 98,
issue 1
页码: 31-44
ISSN:0016-786X
年代: 1976
DOI:10.1080/11035897609454336
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A list of 25 localities with silicified fossils is given. Silicification was selective. At most of the localities, only the bryozoans and brachiopods are affected. Their skeletons originally consisted of low-magnesium calcite. Silicified gastropods (original shells mainly aragonite) and crinoids (original skeletons probably high-magnesium calcite) occur only at three localities. Seven other taxa are also represented. The origin of the silica was tephra, as is indicated by the close connection between the bentonites and the levels with siHcified fossils. The source area for the tephra was probably south of Gotland.
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