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

By
Alexander N. Larionov
Alexander N. Larionov
1
Isotope Research Centre, VSEGEI
Sredny Prospect 74, 199106 St Petersburg, Russia
cirvsg@vsegei.sp.ru
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V. A. Andreichev
V. A. Andreichev
2
Geological Institute of the Komi Science Centre RAS
54 Pervomaiskaya str., 167610 Syktyvkar, Komi Republic, Russia
cirvsg@vsegei.sp.ru
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D. G. Gee
D. G. Gee
3
Institution for Earth Science, Geocentrum, Uppsala University
Villav. 16, 752 36, Uppsala, Sweden
david.gee@geo.uu.se
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Published:
January 01, 2004

Abstract

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.

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Contents

Geological Society, London, Memoirs

The Neoproterozoic Timanide Orogen of Eastern Baltica

David G. Gee
David G. Gee
Uppsala University, Sweden
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Victoria Pease
Victoria Pease
Stockholm University, Sweden
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Geological Society of London
Volume
30
ISBN electronic:
9781862394056
Publication date:
January 01, 2004

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