STRUCTURAL ANALYSIS AND DETRITAL ZIRCON (U-TH)/HE AGES FROM PALEOZOIC STRATA OF THE NW NOVAYA ZEMLYA ARCHIPELAGO (RUSSIAN HIGH ARCTIC)
Six samples from Paleozoic successions of the NW Novaya Zemlya Archipelago were analyzed for ZHe analysis. The obtained ZHe ages are younger than the depositional age of the studied strata, indicating the ages have been reset since deposition. The ZHe data constrain the minimum burial depth of the studied succession to >~7 km and provide information on the exhumation history of the NW Novaya Zemlya Archipelago. ZHe ages from Cambrian to Devonian strata yield two age peaks at ca. 218 and 180 Ma, pointing to significant uplift and erosion in the Late Triassic and Early Jurassic.
The two stages of deformation revealed from the structural studies are attributed to two separate episodes of orogenic activity within the study region. We speculative assume that the first stage of folding is likely related to the Caledonian or Ellesmerian orogenies. The second stage of deformation, with significant Late Mesozoic uplift as suggested by the ZHe ages, is related to the latest stages of the Uralian Orogeny.
This research was supported by RFBR grant 16-55-20012 & The Research Council of Norway grant 254962/H30.