Rare late Neoproterozoic detritus in SW Scandinavia as a response to distant tectonic processes

Abstract

Rare late Neoproterozoic (Cryogenian and Ediacaran) detrital zircons are detected in sedimentary sequences of Ediacaran to Carboniferous age in SW Scandinavia. New data on five samples of clastic metasediment corroborate their presence. Three distinct sources are proposed for late Neoproterozoic zircons based on new and literature data: (1) rift-related magmatism along the W margin of Baltica connected with the opening of Iapetus in the Neoproterozoic, (2) the Neoproterozoic to Cambrian Timanian orogeny at the NE margin of Baltica and (3) Cadomian terranes incorporated into the Variscan orogen accreted from the south to Laurussia during the Devonian and Carboniferous. The appearance of late Neoproterozoic detritus, which is otherwise exotic to Baltica, is therefore bound to tectonic processes active at the margins of the palaeocontinent. In a broader perspective, rare detrital zircon populations, when confirmed as genuine, are extremely valuable provenance indicators.

Detrital zircon U-Pb and Hf constraints on provenance and timing of deposition of the Mesoproterozoic to Cambrian sedimentary cover of the East European Craton, Belarus

“…6). Similar major provenance shifts from the bimodal (1.5 and 1.8 Ga) to polymodal distribution with a Neoproterozoic cluster were reported from Estonia (Isozaki et al, 2014), the Russian part of the Baltic Monoclise (Kuznetsov et al, 2011;Ivleva et al, 2016) and Scandinavia (lower Cambrian in Lorentzen et al, 2017 vs. middle-upper Cambrian in Slàma andPedersen, 2015;Sláma, 2016). Similarly, the middle Cambrian sediments of the Okuniew IG-1 borehole (Podlasie Depression Poland, SW part of the EEC; Valverde-Vaquero et al, 2000) and of the Syczyn OU1 borehole (Lublin Basin; Porębski et al, 2019) contain a Neoproterozoic zircon cluster.…”

“…The first is the Timanide belt along the northern edge of Baltica (cf. Kuznetsov et al, 2011;Isozaki et al, 2014;Sláma and Pedersen, 2015;Ivleva et al, 2016;Sláma, 2016). The second possible source terrain is located around the SW corner of the present-day EEC and it is related to a peri-Gondwanan Neoproterozoic terrane (Scythia) docked to the Baltica margin (Fig.…”

Provenance and Sediment Maturity as Controls on CO2 Mineral Sequestration Potential of the Gassum Formation in the Skagerrak

“…Only a few ages coincide with the age of the Oslo Graben, which is probably because the zircon fertility is low in these extrusive rocks (Corfu et al, 2015). Timanian ages have not been encountered elsewhere in the Norwegian-Danish Basin (Olivarius and Nielsen, 2016), and such ages are rare in Fennoscandia since they correspond to the Timanian Orogen far to the northeast, which was eroded in Cambrian-Ordovician time where sediment was transported toward the southwest (Slama, 2016). These sediments are preserved locally in southern Norway, so it is likely that they have supplied detritus to proximal parts of the Gassum Formation in the study area.…”

“…this is the only sample with zircon ages that coincide with the age of the Timanian Orogen (c. 0.75-0.49 Ga) occurring far to the northeast. This orogen was eroded during the Cambrian-Ordovician and some of the produced detritus was deposited in southern Norway where it is outcropping in some areas (Slama, 2016).…”

The pre-orogenic detrital zircon record of the Peri-Gondwanan crust

“…Number of analysed ages in brackets. References (superscript): (1) Andresen et al (2014); (2) Avigad et al (2003); (3) Avigad et al (2007); (4) Avigad et al (2015); (5) Kolodner et al (2006); (6) Moghadam et al (2017); (7) Altumi et al (2013); (8) Bea et al (2010); (9) Meinhold et al (2011); (10) Meinhold, Morton & Avigad (2013); (11) Linnemann et al (2011); (12) Abati et al (2010); (13) Avigad et al (2012); (14) Horbe et al (2013); (15) Matteini et al (2012); (16) Andersen, Griffin & Pearson (2002); (17) Be'eri-Shlevin et al (2011); (18) Gee et al (2014); (19) Slama (2016); (20) Bream et al (2004); (21) Hofmann et al (2011); (22) Yao et al (2012); (23) Shu et al (2011); (24) Boger et al (2000); (25) Carson et al (2000); (26) Corvino et al (2005); (27) Corvino & Henjes-Kunst (2007); (28) Corvino et al (2008); (29) Halpin et al (2012); (30) Kelly, Clarke & Fanning (2002); (31) Kelly, Clarke & Fanning (2004); (32) Mikhalsky et al (2006). …”