dc.contributor.author | Korneliussen, Are | |
dc.contributor.author | Sawyer, Edward | |
dc.coverage.spatial | 14313 Skjomdalen | |
dc.coverage.spatial | 14312 Cunojavri | |
dc.coverage.spatial | 14311 Bjørnfjell | |
dc.coverage.spatial | HAMARØY | |
dc.coverage.spatial | 13311 Skjomen | |
dc.coverage.spatial | EVENES | |
dc.coverage.spatial | NARVIK | |
dc.coverage.spatial | 13312 Frostisen | |
dc.coverage.spatial | 14314 Narvik | |
dc.date.accessioned | 2020-08-26T09:00:49Z | |
dc.date.available | 2020-08-26T09:00:49Z | |
dc.date.issued | 1989 | |
dc.identifier.uri | https://hdl.handle.net/11250/2674078 | |
dc.description.abstract | The supracrustal sequence of the Rombak Basement Window, consisting of vocanic rocks and quartzites, was intruded by mafic dykes, mafic to intermediate plutons and variety of granitoid batholiths c. 1.8-1.7 Ga aga. The region has experienced amphiobolite-grade metamorphism, followed by retrogression to greenschist facies along Caledonian shear-zones.On the basis of their petrographic and geochemical characteristics the volcanic rocks can be divided into 3 suites: (1) high-Mg basalts; (2) mafic to felsic volcanites with fairly high potassium contents and with calc-alkaline affinities; and (3) low-potassium, calc-alkaline felsic volcanites. Based on major element geochemistry the evolution of the potassic volcanites is interpreted to have been controlled, in the case of mafic-intermediate varieties, by early fractionation of Fe, Mg-rich minerals, and by plagioclase crystallisation for the felsic varieties. Suites 2 and 3 are similar to associated granites and granodiorites in their chemical composition.It is concluded that the volcano-sedimentary and intrusive rocks were formed in an lower Proterozoic mature magmatic arc environment at the southern margin of a continent composed predominantly of Archean tonalitic granitoid rocks and Lower Proterozoic greenstone terranes. | |
dc.language.iso | eng | |
dc.relation.ispartofseries | NGU Bulletin (415) | |
dc.rights | Navngivelse 4.0 Internasjonal | |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | |
dc.subject | PREKAMBRIUM | |
dc.title | The geochemistry of Lower Proterozoic mafic to felsic igneous rocks, Rombak Window, North Norway. | |
dc.type | Journal article | |
dc.description.localcode | 36219 | |
dc.source.pagenumber | 7-21 | |