Evolution of the Triassic shelf in the northern Barents Sea region

Abstract

The interpretation of an unpublished data set of shallow stratigraphic cores and deep, seismic profiles from the northern Barents Shelf has provided new information about the Middle and Late Triassic development of the Barents Shelf and Svalbard. At that time, sediment sources along the eastern and southeastern margins of the Barents Sea controlled the infilling of a previously deeper shelf area, gradually converting it into a paralic platform. Compared with the eastern source, sediment volumes from other areas were small. In our data, there are no indications of a provenance area north of Svalbard. Progradation from the ESE resulted in diachronous lithostratigraphic boundaries. The organic-rich shales of the Botneheia and Steinkobbe formations were deposited in the remaining deeper shelf areas in the western and northwestern Barents Sea shelf, from the Olenekian to the latest Ladinian, by which time the progradation from the ESE had reached eastern Svalbard. In mid-Carnian times, the area of paralic deposits extended from the eastern Barents Sea into the Svalbard Archipelago.

Evolution of the provenances of Triassic rocks in Franz Josef Land: U/Pb LA-ICP-MS dating of the detrital zircon from Well Severnaya

“…The contribution of the Neoproterozoic sources systematically decreased, while the role of the Caledonian sources increased from the beginning of the Middle to the end of the Late Triassic. The obtained data indicate that terrige nous material carried from the Uralian fold belt reached the Franz Josef Land Archipelago no later than in the Middle Triassic and was transferred to Svalbard only in the Late Triassic (Riis et al, 2008;Bue et al, 2011;Bue and Andersen, 2013). Triassic sediments of the Franz Josef Land Archipelago were deposited in a single North Barents Basin, and their formation was not related to the evolution of the Sve drup Basin.…”

The Upper Triassic flora of Svalbard

“…The fossils were most likely collected on the beach according to the logbook 973 entry by Jules Richard (which reads "10h am-3h pm: Hope Island: different objects have been collected, …"; Jacqueline Carpine-Lancre, personal communication 2012). Although Nathorst favoured a Jurassic age for the fossils (Albert I of Monaco 1899), Hopen is known to consist entirely of Upper Triassic (Carnian and Norian) rocks and the exposed succession comprises mostly claystone and sandstone beds of the De Geerdalen Formation Mørk et al 1999Mørk et al , 2013Riis et al 2008;Strullu-Derrien et al 2012). Three specimens of the material belonging to the Prince Albert I of Monaco have been illustrated in a short note within an expedition report by Høeg (1926).…”

Chapter 6 Phanerozoic palaeoenvironment and palaeolithofacies maps of the Arctic region

“…Low sea-level, aridity and rifting resulted in the widespread terrestrial clastic deposits with red beds and evaporites in Central and Western Europe during the Early Triassic (Ziegler 1982;Ronov et al 1989). Mixed coarse and fine-grained clastics prevailed on the Barents shelf (Rønnevik et al 1982;Johansen et al 1993;Bogatski et al 1996;O'Leary et al 2004;Faleide et al 2008;Riis et al 2008;Tugarova et al 2008). Marginal marine environment with clastic deposition existed in the seaway between Europe and Greenland (Stemmerik 2000).…”

“…Alaska, Sverdrup, and Barents Sea) contain black shales that have source rock potential (Leith et al 1993;Parrish et al 2001). In general, mixed coarse and fine-grained clastics were deposited on the Barents shelf (Rønnevik et al 1982;Johansen et al 1993;Bogatski et al 1996;O'Leary et al 2004;Faleide et al 2008;Riis et al 2008;Tugarova et al 2008). Terrestrial clastics were deposited on Siberia, while a marine environment prevailed in the Verkhoyansk area (Ronov et al 1989).…”