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Geochemistry of the fellingsbro type granites, south central Sweden
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Luleå University of Technology.
1988 (English)In: Geologie & Mijnbouw, ISSN 0016-7746, E-ISSN 1573-9708, Vol. 67, no 2-4, p. 213-225Article in journal (Refereed) Published
Abstract [en]

The Fellingsbro granite sensu stricto is a massive coarse-grained rock characterized by red, angular microcline megacrysts up to 7 cm long. The Lisjo granite is of the same type as the Fellingsbro granite but is situated 20 km to the NE. Gravity studies suggest that the Fellingsbro and Lisjo granites rose from a huge granite ridge through structuraly controlled root zones, forming mushroom-shaped intrusions. These porphyritic granites have the geochemical characteristics (eg high Y, Nb, Zr and HREE) of granites generated as "within-plate' or tensional rifting environments. The even-grained interior of the Lisjo granite and the contemporaneous Dingtuna and Pingstaberg granites, were generated by differentiation of granites with similar characteristics as the porphyritic Fellingsbro granite. Recently published U-Pb zircon datings have demonstrated that the Smaland-Varmland granite-porphyry Belt has approximately the same age as the granites in this study. We speculate that both groups were emplaced in a tensional environment on the continental side of a subduction related calc-alkaline belt, remnants of which may be preserved in the SW Swedish Gneiss Region.

Place, publisher, year, edition, pages
1988. Vol. 67, no 2-4, p. 213-225
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-10475Local ID: 94adef70-dd2f-11db-9cae-000ea68e967bOAI: oai:DiVA.org:ltu-10475DiVA, id: diva2:983420
Note
Godkänd; 1988; Bibliografisk uppgift: The Bergslagen Province,Central Sweden : structure, stratigraphy and ore-forming processes. Editors: James H. Baker and Robert H. Hellingwerf; 20070328 (pafi)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Öhlander, Björn

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