The Mesoproterozoic (1.47-1.44 Ga) orogenic magmatism in Fennoscandia; Baddeleyite U-Pb dating of a suite of massif-type anorthosites in S Sweden

Summary, in English

The Jonkoping Anorthositic Suite (JAS) in S. Sweden has characteristics typical for (Proterozoic) massif-type anorthosites. The interstitial liquid of these plagioclase-porphyritic rocks solidified at 1,455 +/- A 6 Ma, as determined by U-Pb isotope analysis of baddeleyite. The JAS developed during a regional 1.47-1.44 event in Fennoscandia that generated widespread mafic magmatism (basalts, and diabase dykes and sills) in the north and emplacement of felsic plutons in the south. The event of 1.47-1.44 Ga magmatism in Fennoscandia largely coincides in age with dynamic high-grade metamorphism in SW Sweden and was probably related to convergent active-margin processes during the Danopolonian orogeny.

• Författare: Linus Brander; Ulf Söderlund
• Avdelning/ar: Berggrundsgeologi
• Publiceringsår: 2009
• Språk: Engelska
• Sidor: 499-516
• Publikation/Tidskrift/Serie: International Journal of Earth Sciences
• Volym: 98
• Issue: 3
• Länkar: http://dx.doi.org/10.1007/s00531-007-0281-0
• Dokumenttyp: Artikel i tidskrift
• Förlag: Springer
• Ämne: Geology
• Nyckelord: Fennoscandia; anorthosites; massif-type; baddeleyite; Danopolonian
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 1437-3254