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Some aspects on the subdivision of the Haparanda and Jörn intrusive suites in northern Sweden
Luleå tekniska universitet.
Luleå tekniska universitet, Geovetenskap och miljöteknik.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Luleå tekniska universitet.ORCID iD: 0000-0003-3879-3897
Swedish Museum of Natural History.
2003 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 125, no 2, p. 77-85Article in journal (Refereed) Published
Abstract [en]

The geographical subdivision between the Haparanda and the Jörn suites of intrusive rocks in northern Sweden has not been very well defined. Early stratigraphical schemes placed these two granitoid suites in two separate orogenic cycles, where the Jörn belonged to the older cycle and Haparanda to the younger. Our present knowledge regarding the isotopic ages of these rocks in northern Sweden has changed this view, but has also made the distinction between the two suites less clear. Based on recent Sm–Nd isotopic work combined with geochemistry and some new U–Pb zircon data, we point out some similarities as well as some differences between the Jörn and Haparanda suites of rocks. Two U–Pb zircon age determinations performed give upper intercept ages of 1891±32 Ma and 1861±19 Ma which are interpreted as maximum ages. The two samples are taken from the Luleå area, on each side of the Archaean–Proterozoic boundary, as defined by Sm–Nd isotopic analyses of c.1.9 Ga old intrusive rocks combined with the southern limit of outcropping Archaean rocks. On the basis of new results together with results from previous studies of areas north and south of the Archaean–Proterozoic boundary, we also suggest how to separate the Haparanda and Jörn suites of rocks due to their geochemical, and isotope geochemical, characteristics. The Haparanda suite generally has negative εNd(t) values and was formed within or in marginal parts of the Archaean craton. The Jörn suite was formed in an juvenile, island-arc terrane, that was accreted to the Archaean craton during the later, collisional stages of the Svecokarelian orogeny. In a similar way, we connect the Haparanda suite of rocks with the Archaean craton, and the Jörn suite of rocks with Svecofennian juvenile crust.

Place, publisher, year, edition, pages
2003. Vol. 125, no 2, p. 77-85
National Category
Geology
Research subject
Applied Geology; Ore Geology
Identifiers
URN: urn:nbn:se:uu:diva-327686DOI: 10.1080/11035890301252077Local ID: ceb66200-8a1f-11db-8975-000ea68e967bOAI: oai:DiVA.org:uu-327686DiVA: diva2:1131092
Note

Validerad; 2003; 20061123 (bajo)

Available from: 2016-09-29 Created: 2017-08-11

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Publisher's full texthttp://www.gff-online.se/site/article.asp?articleID=743

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