NEW EVIDENCE FOR GRENVILLE AND VALHALLA TECTONIC EVENTS AT THE WESTERN MARGIN OF SIBERIAN CRATON: THE EXAMPLE OF THE GAREVKA METACOMPLEX, YENISEY RIDGE

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We report new data on the petrogenesis, tectonic settings, thermodynamic conditions, metamorphism and protolith ages for compositionally contrasting rocks of the Garevka metamorphic complex, obtained from the results of mineralogical-petrological, geochemical, and isotope-geochronological studies. Zircon SHRIMP U–Pb analyses coupled with 40 Ar- 39 Ar dating constrain the timing of two new pulses of Neoproterozoic endogenous activity at the western margin of the Siberian Craton, associated with Grenville (930–900 Ma) and (880–845 Ma) post-Grenville Valhalla (880–845 Ma) accretion-and-collision processes.