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dc.contributor.authorWalker, Nicholas
dc.contributor.authorBjerkgård, Terje
dc.contributor.authorBirkeland, Anne
dc.contributor.authorLarsen, Rune B.
dc.coverage.spatial19261 Røssvatnet
dc.date.accessioned2020-07-15T08:28:28Z
dc.date.available2020-07-15T08:28:28Z
dc.date.issued1995
dc.identifier.issn0800-3416
dc.identifier.urihttps://hdl.handle.net/11250/2666065
dc.description.abstractFrie emneord: Sulfidmalmforekomst Fluorrike biotitter The Bleikvassli massive sulphide deposit is closely associated with a microcline gneiss interpreted as the metamorphosed equivalent of an alkaline magmatic rock of syenitic composition which yield a concordant U\/Pb zircon age of 481 +- Ma. A 30 metres wide zone along the margin of the microcline gneiss suffered intensive alkali-depletion and addition of iron and magnesium, when it was metamorphosed together with the massive sulphides. Iron and magne- sium partitioned in to biotite and phengitic mica and biotite show a conspi- cuous enrichment of fluorine and depletion of iron compared to the unaltered interior of the microcline gneiss. Partitioning of fluorine in favour of biotite is an indirect effect of the proximity to the massive sulphides. This is because an environment with a high fs2 wil favour the crystallisation of phlogopitic biotites which will enhance the substitutional exchange of F for OH. Because of this effect, fluorine can be used as a guide revealing the existence of unexposed massive sulphide deposits.
dc.language.isoeng
dc.relation.ispartofseriesNGU-Rapport (95.152)
dc.rightsNavngivelse 4.0 Internasjonal
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no
dc.subjectOMVANDLING
dc.subjectGEOLOGISK UNDERSØKELSE
dc.subjectSINK
dc.subjectBLY
dc.subjectKOBBER
dc.subjectSØLV
dc.subjectGNEIS
dc.subjectSULFID
dc.titleFluorine-rich biotites and alkali-metasomatism as guided to massive sulphide deposits: an example from the Bleikvassli Zn-Pb-Ah-(CU) deposit, Norway
dc.typeReport
dc.description.localcode34414
dc.source.pagenumber37


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