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Age and character of late-Svecokarelian monzonitic intrusions in northeastern Norrbotten, northern Sweden
Luleå University of Technology.
Sveriges geologiska undersökning.
Swedish Museum of Natural History, Department of Geology.
Sveriges geologiska undersökning.
2018 (English)In: SGU Rapporter och meddelanden, ISSN 0349-2176, Vol. 141, p. 381-400Article in journal (Refereed) Published
Abstract [en]

Palaeoproterozoic magmatism in northern Norrbotten shows a complex evolution, with several different plutonic suites ranging in age 1.93–1.70 Ga. Here we present data for three monzonitic intrusions from different parts of the area. They are petrographically and chemically similar, consisting mainly of perthite, augite and orthopyroxene, with megacrysts of poikilitic biotite as a characteristic minor component, and with high Sr and Ba. The intrusions have been dated at 1.80 Ga and may be part of a more extensive magmatic event in northern Sweden, including other chemically similar monzonitic and gabbroic intrusions, which often occur as ring dykes at the Merasjärvi gravity high (MGH) in northeastern Norrbotten. The monzonitic intrusions have A-type signatures and chemical characteristics overlapping those of rocks in arc and within-plate settings. These intrusions may thus have formed in either a back arc setting related to eastward subduction associated with the Transscandinavian Igneous Belt further west (TIB 1), or through a separate igneous event caused by a mantle plume.

Place, publisher, year, edition, pages
Uppsala: Sveriges geologiska undersökning , 2018. Vol. 141, p. 381-400
National Category
Geology
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-3169OAI: oai:DiVA.org:nrm-3169DiVA, id: diva2:1272254
Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2018-12-18Bibliographically approved

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CiteExportLink to record
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Citation style
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