New data on the basement of Franz Josef Land, Arctic region

Abstract

We have studied pebbles of igneous rocks from the Lower Jurassic sedimentary succession of Hall Island, Franz Josef Land. Pebbles are represented by felsic intrusive and extrusive rocks, often cataclased and greisenized. The U-Pb age of crystallization for zircons of the studied samples yielded the Latest Devonian-Early Carboniferous and Early-Middle Permian ages. In addition, the studied zircons demonstrate a broad scatter of ages, from Middle Paleozoic to Mesozoic, suggesting repeated thermal reworking and metamorphism of granites. It is shown that coeval Late Paleozoic magmatism indicates the similarity of the geological evolution of the northern Barents Sea and the Severnaya Zemlya archipelago.

Provenance Analysis of the Andrée Land Basin and Implications for the Paleogeography of Svalbard in the Devonian

“…; (b) Middle Devonian (Figure 8): Svalbard (this study; Beranek et al, 2020), Western Norway (Templeton, 2015, p. 3 representative samples out of 15), East Greenland (Slama et al, 2011), Canadian Arctic Islands Anfinson, Leier, Gaschnig, et al, 2012), and the New Siberian Islands (Ershova et al, 2018). (c) Late Devonian (Figure 9): Svalbard (this study), East Greenland (Templeton, 2015), Canadian Arctic Islands Anfinson, Leier, Gaschnig, et al, 2012), Northwest Canada (Beranek et al, 2010;Lemieux et al, 2011), New Siberian Islands (Ershova et al, 2015a(Ershova et al, , 2015bErshova et al, 2018), Seward Peninsula (Amato et al, 2009), Northeast Siberia (Ershova et al, 2020), Northern Baltica (Miller et al, 2011), Novaya Zemlya (Lorenz et al, 2013). No age filters were applied to the published data and the "Best Age" (i.e., accepted ages from authors) column was used when available.…”

“…Upper Devonian strata are present over a much broader geographic distribution in the modern circum Arctic compared to that of Lower and Middle Devonian strata. These Upper Devonian strata have drawn increased attention from researchers due to potential bearing on the extent and timing of the Ellesmerian orogen Anfinson, Leier, Gaschnig, et al, 2012;Beauchamp et al, 2019;Beranek et al, 2010;Ershova et al, 2015aErshova et al, , 2015bLemieux et al, 2011;Piepjohn et al, 2000;Vogt, 1928; this study), and their preservation of important fossil assemblages including some of the first documented fossil forests from within studied Andrée Land Group strata from Svalbard (Figure 3f; Location noted on Figure 2a; Berry & Marshall, 2015).…”

“…Age ranges for KDE and pie diagrams listed in Figure 4. Detrital zircon data sources: Svalbard (This study), East Greenland (Templeton, 2015), Canadian Arctic Islands Anfinson, Leier, Gaschnig, et al, 2012), Northwest Canada (Beranek et al, 2010;Lemieux et al, 2011), New Siberian Islands (Ershova et al, 2015a(Ershova et al, , 2015b, Seward Peninsula (Amato et al, 2009), Northeast Siberia (Ershova et al, 2020), Northern Baltica (Miller et al, 2011), Novaya Zemlya (Lorenz et al, 2013).…”

“…Notably, in late Devonian strata, there is increased abundance and more widespread distribution of Timanian detrital zircon ages (Figure 9), suggesting increased exhumation of, or catchment expansion into, Timanian aged detrital zircon sources. The Timanian ages have been useful in identifying new detrital sources in circum arctic strata (e.g., Anfinson, Leier, Gaschnig, et al, 2012;Beranek et al, 2010;Ershova et al, 2015aErshova et al, , 2015b. The exact sources of these Timanian ages are often difficult to place, but there is increasing evidence of widespread magmatism associated with the Timanide orogen and the involve-ment of regions not typically considered part of the sensu stricto Timanide Orogen (e.g., xenoliths in northeastern Greenland; Rosa et al, 2016).…”

“…The second unit of the lower ORS succession is represented by ∼3.5 km thick sandstone and conglomerate of the Lochkovian (earliest Devonian) Red Bay Group (Holtedahl, 1914), which are mainly exposed in the narrow, NNW-SSE trending Raudfjorden Trough between the Raudfjorden Fault in Colpron and Nelson [2009]). Detrital zircon data by location (East to West from Prime Meridian): EG, East Greenland (Slama et al, 2011); CA, Canadian Arctic Islands Anfinson, Leier, Gaschnig, et al, 2012), NC, Northwest Canada (Beranek et al, 2010;Lemieux et al, 2011); AT, Alexander terrane (Beranek et al, 2013;Tochilin et al, 2014;White et al, 2016); SP, Seward Peninsula (Amato et al, 2009); NI, New Siberian Islands (Ershova et al, 2015a(Ershova et al, , 2015bErshova et al, 2018); NS, Northeast Siberia (Ershova et al, 2020); SZ, Severnaya Zemlya (Lorenz et al, 2008); NZ, Novaya Zemlya (Lorenz et al, 2013); NB, Northern Baltica (Miller et al, 2011);Sv, Svalbard (This study;Beranek et al, 2020;Pettersson et al, 2010); WN, Western Norway (Templeton, 2015). Geographic references: PE, Pearya terrane; LR, Lomonosov Ridge; CB, Chukchi Borderland; and FJL, Franz Joseph Land.…”