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

Author:

Larionov Alexander N.1,Andreichev V. A.2,Gee D. G.3

Affiliation:

1. Isotope Research Centre, VSEGEI Sredny Prospect 74, 199106 St Petersburg, Russia cirvsg@vsegei.sp.ru

2. Geological Institute of the Komi Science Centre RAS 54 Pervomaiskaya str., 167610 Syktyvkar, Komi Republic, Russia cirvsg@vsegei.sp.ru

3. Institution for Earth Science, Geocentrum, Uppsala University Villav. 16, 752 36, Uppsala, Sweden david.gee@geo.uu.se

Abstract

AbstractNear 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.

Publisher

Geological Society of London

Subject

Geology

Reference26 articles.

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2. Andreichev V. A. (1998) Isotope geochronology of intrusive magmatism in Northern Timan (Ekaterinbourg), [in Russian], pp 1–90.

3. Timanian blueschist-facies metamorphism in the Kvarkush metamorphic basement, Northern Urals, Russia

4. Cherny V. G. Smirnov V. G. Chernaya I. P. (1972) Materials on geology and resources of North-East of the European part of USSR, Formational analysis of the Timan igneous rocks, (Syktyvkar) [in Russian], pp 167–179.

5. Gee D. G. (2000) Timan-Kanin international expedition. Cruise report. Polarforskningssekretariatets årsbok, 69–73.

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