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Caledonian Pyroclastic (?) Serpentinite in Central Norway

By
Christoffer Oftedahl
Christoffer Oftedahl
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Published:
January 01, 1969

Serpentinite beds within the Lalm-Sel area in the Caledonides of central Norway occur as a more or less clearly developed “serpentine conglomerate,” a term used in the literature. This rock is unique because in one locality it contains a rich fauna, determined to an age around the boundary Lower to Middle Ordovician. The serpentinite occurs as beds in a strongly folded eugeosynclinal series of greenschists and phyllite.

The observations and some evidence from recent literature are used in discussing the origin of the “serpentine conglomerate:” tectonic mélange, lava, metasomatic origin, true sedimentary origin, or pyroclastic origin. The latter is slightly favored, mostly from negative evidence: the “conglomerate” must be a sedimentary formation, but a pyroclastic origin seems less impossible than a truly sedimentary one.

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GSA Memoirs

Igneous and Metamorphic Geology

Leonard H. Larsen
Leonard H. Larsen
Editor
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;
Martin Prinz
Martin Prinz
Co-editors
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;
Vincent Manson
Vincent Manson
Co-editors
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Geological Society of America
Volume
115
ISBN print:
9780813711157
Publication date:
January 01, 1969

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