Preliminary investigations of some Ordovician volcanics from Stord, West Norway.
dc.contributor.author | Lippard, Stephen John | |
dc.coverage.spatial | 11141 Fitjar | |
dc.coverage.spatial | 12144 Husnes | |
dc.date.accessioned | 2020-08-26T13:16:06Z | |
dc.date.available | 2020-08-26T13:16:06Z | |
dc.date.issued | 1976 | |
dc.identifier.uri | https://hdl.handle.net/11250/2675040 | |
dc.description.abstract | Later Ordovician volcanics on Stord, W. Norway, comprise alkaline rhyolite flows and ignimbrites, and ferro-basalt (icelandite) and basaltic andesite lavas. The latter are hy-normative, \"evolved\" rocks rich in residual trace elements and low in Ni and Cr. The rhyolites are highly fractionated rocks. They contrast with later intrusions of granite porphyry which are clac-alkaline and poorer in Zr, Nb, Y, and REE, and richer in Ca, Mg and Sr than rhyolites. Subaerial volcanism of this type suggests an intra-continental, possibly rifted, environment in this part of southwestern Norway in the late Ordovician. Younger dolerite sills and basalt dykes in the area are continental tholeiites and transitional basalts. | |
dc.language.iso | eng | |
dc.relation.ispartofseries | NGU (327) | |
dc.rights | Navngivelse 4.0 Internasjonal | |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | |
dc.subject | PETROGRAFI | |
dc.subject | GEOKJEMI | |
dc.subject | ORDOVICIUM | |
dc.subject | STRATIGRAFI | |
dc.subject | OMDANNING | |
dc.subject | DAGBERGART | |
dc.title | Preliminary investigations of some Ordovician volcanics from Stord, West Norway. | |
dc.type | Journal article | |
dc.description.localcode | 35538 | |
dc.source.pagenumber | 41-66 |
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