The Vendian alkaline igneous suite of northern Timan: ion microprobe U-Pb zircon ages of gabbros and syenite
- 17 January 2004
- journal article
- Published by Geological Society of London in Geological Society, London, Memoirs
- Vol. 30 (1) , 69-74
- https://doi.org/10.1144/gsl.mem.2004.030.01.07
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.Keywords
This publication has 12 references indexed in Scilit:
- Neoproterozoic, passive-margin, sedimentary systems of the Kanin Peninsula, and northern and central Timan, NW RussiaGeological Society, London, Memoirs, 2004
- Timanian blueschist-facies metamorphism in the Kvarkush metamorphic basement, Northern Urals, RussiaGeological Society, London, Memoirs, 2004
- Timanian orogenic deformation along the northeastern margin of Baltica, Northwest Russia and Northeast Norway, and Avalonian–Cadomian connectionsPublished by Elsevier ,2002
- Single-zircon Pb evaporation geochronology constrains basement-cover relationships in the lower Hecla Hoek Complex of northern Ny Friesland, SvalbardChemical Geology, 1997
- Structure and geodynamics of the Uralian orogenGeological Society, London, Special Publications, 1997
- THREE NATURAL ZIRCON STANDARDS FOR U‐TH‐PB, LU‐HF, TRACE ELEMENT AND REE ANALYSESGeostandards Newsletter, 1995
- Zircon zonation patterns as revealed by cathodoluminescence and backscattered electron images: Implications for interpretation of complex crustal historiesChemical Geology, 1993
- Whole-grain evaporation for 207Pb/206Pb-age-investigations on single zircons using a double-filament thermal ion sourceContributions to Mineralogy and Petrology, 1986
- Subcommission on geochronology: Convention on the use of decay constants in geo- and cosmochronologyEarth and Planetary Science Letters, 1977
- Approximation of terrestrial lead isotope evolution by a two-stage modelEarth and Planetary Science Letters, 1975