Abstract
The Northern Timan is an uplifted block of Late Precambrian basement of the Timan Ridge, where Neoproterozoic sedimentary-metamorphic rocks of the Barmin Group are cut by intrusive rocks of different composition and all unconformably overlain by Lower Silurian limestone. To determine the age of granites, U-Pb dating of zircons was carried out using secondary ion mass spectrometry (SIMS). Two episodes of Neoproterozoic granite magmatism were established. Granite rocks of the Bolshoy Kameshek (613 ± 6 Ma) and Cape Bolshoy Rumyanichny (614 ± 11 Ma) plutons are interpreted to be associated with the formation of Central Iapetus Magmatic Province and record the Ediacaran stage of Rodinia breakup. The granites of the Sopki Kamennyie pluton (723‒727 Ma) formed in Cryogenian time and are assumed to represent an earlier episode of Rodinia breakup. Their ages correlate with the age of the Franklin LIP that existed in Northern Laurentia and is believed to have spread to South Siberia.
Highlights
In the Kanin-Timan region of the northwestern Russia (Fig. 1), which includes the Kanin Peninsula and the Timan Ridge, intrusive gabbro-dolerites and dolerites, granites, syenites, olivine-kersutite gabbros and alkaline gabbroic rocks are exposed only in the northwestern part of Northern Timan [Ivensen, 1964; Mal’kov, 1972; Kostyukhin, Stepa nenko, 1987]. These magmatic rocks are of undoubted scien tific interest due to the fact that they are located on the Neo proterozoic passive margin of the Baltica paleocontinent and provide information on timing of plume- or rift-related mag matism in this region
In the Northern Timan, the intrusive bodies consisting of gabbroic rocks, syenites and granites cut sedimentary and metamorphic rocks of the Neoproterozoic Barmin Group and are overlain unconformably by Silurian (Llandoverian) limestone (Fig. 1)
In summary, the U-Pb isotopic dating of zircons carried out for the granitoids of the Northern Timan suggests two episodes of magmatism
Summary
In the Kanin-Timan region of the northwestern Russia (Fig. 1) , which includes the Kanin Peninsula and the Timan Ridge, intrusive gabbro-dolerites and dolerites, granites, syenites, olivine-kersutite gabbros and alkaline gabbroic rocks are exposed only in the northwestern part of Northern Timan [Ivensen, 1964; Mal’kov, 1972; Kostyukhin, Stepa nenko, 1987]. These magmatic rocks are of undoubted scien tific interest due to the fact that they are located on the Neo proterozoic passive margin of the Baltica paleocontinent and provide information on timing of plume- or rift-related mag matism in this region. All calculation errors cited here and in the text below are 2σ
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