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Greenstones related to rifting and ocean basin opening in the Jofjället area, central Swedish Caledonides
Luleå University of Technology.
1981 (English)In: Geologiska föreningens i Stockholm förhandlingar, ISSN 0016-786X, Vol. 103, no 4, p. 421-428Article in journal (Refereed) Published
Abstract [en]

Two greenstone formations in the Jofjllet area, central Swedish Caledonides, have been analysed for major and trace elements in order to establish their petrology and tectonic environment of origin. The formations - the Ruffe Greenstone and the Brackfjllet Greenstone - are situated in the uppermost part of the Seve-Kli Nappe Complex. The enrichment in volatiles, depletion in SiO2, redistribution of CaO and alkali contents are certainly caused by post-eruptive alteration processes. The Ruffe Greenstone is a tholeiite of a transition type between ocean-floor and within-plate basalt, while the Brackfjllet Greenstone is an alkaline basalt showing a clear within-plate basalt affinity. The basalts are possibly formed during the later stages of rifting and ocean basin opening in a near-continental environment. The basalts can probably be correlated with the Stren greenstone in Norway.

Place, publisher, year, edition, pages
1981. Vol. 103, no 4, p. 421-428
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-4516DOI: 10.1080/11035898209453720ISI: A1981PX78100001Scopus ID: 2-s2.0-0019729792Local ID: 274de740-1617-11df-bae5-000ea68e967bOAI: oai:DiVA.org:ltu-4516DiVA, id: diva2:977390
Note

Godkänd; 1981; 20100210 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-11-13Bibliographically approved

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