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U-Pb age and Hf isotope compositions of zircons from the north-western region of the Ukrainian shield: mantle melting in response to post-collision extension
Institute of Geochemistry, Mineralogy and Ore Formation of the National Academy of Sciences of Ukraine, Kyiv.
Laboratory for Isotope Geology. Swedish Museum of Natural History, Stockholm.
University of St. Andrews.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
2012 (English)In: Terra Nova, ISSN 0954-4879, E-ISSN 1365-3121, Vol. 24, no 5, p. 373-379Article in journal (Refereed) Published
Abstract [en]

The North-Western region of the Ukrainian shield represents Palaeoproterozoic continental crust formed essentially during two orogenic events at ca. 2.1–2.05 and 2.0–1.95 Ga. At 1.8–1.74 this area was intruded by huge Korosten anorthosite–mangerite–charnockite granite complex. At least three generations of mafic dykes can be distinguished in the region. We report new U-Pb data obtained for a suite of Ni-enriched dolerite dykes and layered gabbroic intrusions. Our results indicate that the Tomashgorod dyke was formed at 1787.4 ± 6.4 Ma, the Prutivka intrusion at 1777.0 ± 4.7 Ma and the Kamenka massif at ca. 1.79 Ga. This time coincides with the collision of the Fennoscandian and Sarmatian segments of the East European craton and it is contemporaneous with the initial stages of evolution of the Korosten complex. Hf isotopic compositions of zircons indicate that these rocks originated due to melting of moderately depleted mantle material.

Place, publisher, year, edition, pages
2012. Vol. 24, no 5, p. 373-379
National Category
Geophysics
Research subject
Applied Geophysics; Exploration Geophysics
Identifiers
URN: urn:nbn:se:ltu:diva-4540DOI: 10.1111/j.1365-3121.2012.01075.xISI: 000308564300005Scopus ID: 2-s2.0-84866032977Local ID: 27e06a65-ba86-4fb7-a12e-d59de9eeb311OAI: oai:DiVA.org:ltu-4540DiVA, id: diva2:977414
Note
Validerad; 2012; 20120625 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Elming, Sten-åke

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