DBPapers
DOI: 10.5593/SGEM2014/B11/S1.014

GEOCHEMICAL AND ISOTOPE CHARACTERISTICS OF INTRUSIVE TRAPS IN THE EASTERN SIBERIAN PLATFORM

M. D. Tomshin, A.G. Kopylova, A.E. Vasilyeva, A.I. Zaitsev
Wednesday 1 October 2014 by Libadmin2014

References: References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-07-0 / ISSN 1314-2704, June 19-25, 2014,Book 1, Vol. 1, 113-120 pp

ABSTRACT

The paper presents the results of geochemical and isotope studies of intrusive traps in the upper Vilyui River. Three petrochemical groups of rocks are recognized there: I – traps with a moderate Ti content ( 1.5TiO2), II – low-Ti traps (TiO2≤ 1%) with minimal HFSE and REE values, and III – traps enriched in TiO2 and FeOtotal, with high alkalies and incompatible elements contents and a low concentration of coherent Ni and Cr. The model age of the mantle protolith for the basites is 800-1000 Ma as estimated from their Sr-Nd-Pb-Hf systematics.

Keywords: Traps, Siberian platform, east of Tunguska syncline, trap and trace element geochemistry, trap isotopy

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