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dc.contributor.authorRoberts, David
dc.coverage.spatialKVÆNANGEN
dc.coverage.spatial17344 Nordreisa
dc.coverage.spatial17343 Reisadalen
dc.coverage.spatial17341 Kvænangen
dc.coverage.spatialNORDREISA
dc.date.accessioned2020-08-26T09:12:57Z
dc.date.available2020-08-26T09:12:57Z
dc.date.issued1990
dc.identifier.urihttps://hdl.handle.net/11250/2674275
dc.description.abstractTholeiitic metadolerite dyke rocks in the Corrovarre Nappe of the Kalak Nappe Complex in North Troms show chemical traits which indicate T-MORB affinities, with fairly flat, chondrite-normalised REE patterns in a (La\/Nb)N just over 1. The low initial 87Sr\/86Sr ratio, 0.7030, and lack of Th enrichment suggest that the magma was not contaminated to any extent during upward passage from a secondarily slightly LIL element-enriched but primarily depleted mantle source. Element abundamces and ratios and the low initial Sr ratio are compar- able to those from Tertiary T-MORB dykes and lavas from the Vøring Plateau. It is suggested that the Corrovarre dykes, Sm\/Nd-dated to c. 580 Ma, penetrated a continental crust which had thinned appreciably since the time of initial rifting. The dykes probably intruded just prior to the actual inception of sea- floor spreading along this segment of the Baltoscandian margin.
dc.language.isoeng
dc.relation.ispartofseriesNGU Bulletin (419)
dc.rightsNavngivelse 4.0 Internasjonal
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no
dc.subjectSJELDNE JORDARTER
dc.subjectGANGBERGART
dc.subjectKALEDONSKE FJELLKJEDE
dc.titleGeochemistry of mafic dykes in the Corrovarre Nappe, Troms, North Norway
dc.typeJournal article
dc.description.localcode35312
dc.source.pagenumber45-53


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