dc.contributor.author | Roberts, David | |
dc.coverage.spatial | KVÆNANGEN | |
dc.coverage.spatial | 17344 Nordreisa | |
dc.coverage.spatial | 17343 Reisadalen | |
dc.coverage.spatial | 17341 Kvænangen | |
dc.coverage.spatial | NORDREISA | |
dc.date.accessioned | 2020-08-26T09:12:57Z | |
dc.date.available | 2020-08-26T09:12:57Z | |
dc.date.issued | 1990 | |
dc.identifier.uri | https://hdl.handle.net/11250/2674275 | |
dc.description.abstract | Tholeiitic 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.iso | eng | |
dc.relation.ispartofseries | NGU Bulletin (419) | |
dc.rights | Navngivelse 4.0 Internasjonal | |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | |
dc.subject | SJELDNE JORDARTER | |
dc.subject | GANGBERGART | |
dc.subject | KALEDONSKE FJELLKJEDE | |
dc.title | Geochemistry of mafic dykes in the Corrovarre Nappe, Troms, North Norway | |
dc.type | Journal article | |
dc.description.localcode | 35312 | |
dc.source.pagenumber | 45-53 | |