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Geological Society, London, Memoirs; 2004; v. 30; p. 69-74;
DOI: 10.1144/GSL.MEM.2004.030.01.07
© 2004 Geological Society of London

Timanide Fold-and-Thrust Belt

The Vendian alkaline igneous suite of northern Timan: ion microprobe U-Pb zircon ages of gabbros and syenite

Alexander N. Larionov1, V. A. Andreichev2 & D. G. Gee3

1 Isotope Research Centre, VSEGEI, Sredny Prospect 74, 199106 St Petersburg, Russia cirvsg{at}vsegei.sp.ru
2 Geological Institute of the Komi Science Centre RAS, 54 Pervomaiskaya str., 167610 Syktyvkar, Komi Republic, Russia cirvsg{at}vsegei.sp.ru
3 Institution for Earth Science, Geocentrum, Uppsala University, Villav. 16, 752 36, Uppsala, Sweden david.gee{at}geo.uu.se

Near the Barents Sea coast in northern Timan, turbidites of probable Neoproterozoic age are intruded by pre-tectonic dolerites and a major suite of gabbros, granites and syenites (some nepheline bearing). Zircon ion microprobe dating of three plutons has yielded well-defined ages of 613–617 Ma. This alkaline igneous activity apparently represents a final phase of Vendian extensional magmatism prior to Timanian Orogeny. Previous work on late to post-orogenic calc-alkaline granites in the basement beneath the Pechora Basin, three hundred kilometres towards the SE, has yielded c. 550–560 Ma single zircon Pb-evaporation ages. These compositionally different intrusive suites are inferred to constrain the main phase of Timanian Orogeny to c. 610–560 Ma.