Geochemical features of biotite-amphibole monzonites of the Ust-Monholinski massif in the Kotuykan-Monholinski tectonic melange zone correspond to low-Ti and high-Ba-Sr sanukitoidoids. The concordant age of monzonites by zircon (U-Pb, SHRIMP II) of 2702 ± 9 Ma. Geochemical characteristics and isotopic composition of Nd suggest crust-mantle interaction in the genesis of monzonites. εNd values vary from +3.5 to −2.4 and the TNd(DM) values that vary from 2.75 to 3.2 Ga, suggest variable contributions of ancient, probably Mezooarchaean, crust and juvenile material in their genesis.
| Abstracts file: | аннотация.doc |
| Full text file: | Gusev_txt.doc |