Journal
RUSSIAN GEOLOGY AND GEOPHYSICS
Volume 53, Issue 11, Pages 1176-1196Publisher
RUSSIAN ACAD SCIENCES, SIBERIAN BRANCH, VS SOBOLEV INST GEOL & MINEROL
DOI: 10.1016/j.rgg.2012.09.005
Keywords
alkaline magmatism; mineralogy; petrography; geochemistry; geochronology; Neoproterozoic; active continental margin; southwestern framing of the Siberian craton
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Funding
- Russian foundation for basic research [11-05-00131-a]
- Earth Sciences Division of the RAS [ONZ 9.1]
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The formation and evolution conditions for alkaline magmatism and associated igneous rocks in the western framing of the Siberian craton are shown by the example of alkaline and subalkaline intrusive bodies of the Yenisei Ridge. Here we present petrographic, mineralogical, geochemical, and geochronological data for the rocks of the Srednetatarka and Yagodka plutons located within the Tatarka-Ishimba suture zone. Ferroan and metaluminous varieties enriched with rare elements (Nb, Ta, Zr, Hf, and REE) are making up most of the studied rocks. They formed at the stages of fractional crystallization of alkaline magma in a setting of active continental margin in the west of the Siberian craton in the Late Neoproterozoic (710-690 Ma). As differentiates of mantle magmas, these rocks associate with Nb-enriched rocks-A-type leucogranites and carbonatites. Sm/Nd and Rb/Sr isotopic data imply a predominance of the mantle component in the magmatic sources of the mafic and intermediate rocks as well as contamination processes of various volumes of continental crustal material by this magma. (C) 2012, V. S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B. V. All rights reserved.
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