Trondhjemite-granodiorite intrusive magmatism of the Losevo lithotectonic zone of the Voronezh crystalline massif

The mineralogical-petrographic, petrochemical, and geochemical characteristics of the trondhjemite-granodiorite intrusions widespread among the volcanoterrigenous rocks of the eastern part of the Voronezh crystalline massif are studied. The rocks are characterized by cotectic quartz-plagioclase diff...

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Bibliographic Details
Published in:Doklady earth sciences 2014-10, Vol.458 (2), p.1261-1264
Main Authors: Skryabin, V. Yu, Terentiev, R. A.
Format: Article
Language:English
Subjects:
Continental crust
Earth and Environmental Science
Earth Sciences
Geochemistry
Island arcs
Magma
Magmatism
Mineralogy
Petrochemicals
Petrology
Rocks
Zirconium
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Summary:The mineralogical-petrographic, petrochemical, and geochemical characteristics of the trondhjemite-granodiorite intrusions widespread among the volcanoterrigenous rocks of the eastern part of the Voronezh crystalline massif are studied. The rocks are characterized by cotectic quartz-plagioclase differentiation and differentiated (La/Yb = 31) REE pattern and are enriched in LILE with a decrease in the K/Rb and Zr/Hf ratios and an increase in the Th/U ratio by 1.5–2 times relative to subduction trondhjemites and their volcanic analogs from the modern and young island arcs. These data allow us to conclude that generation of the trondhjemite magma is a result of melting of the rocks of the continental crust during collision. The concordant (SHRIMP) age of trondhjemites is 2047 ± 11 Ma, and the age of zircon cores probably entrapped from the host rocks by the trondhjemitic melt is 2172 ± 17 Ma.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X14100201