A new Scandinavian reference 10Be production rate

Abstract

An important constraint on the reliability of cosmogenic nuclide exposure dating is the rigorous determination of production rates. We present a new dataset for Be production rate calibration from Mount Billingen, southern Sweden, the site of the final drainage of the Baltic Ice Lake, an event dated to 11,620 ± 100 cal yr BP. Five samples of flood-scoured bedrock surfaces (58.5°N, 13.7°E, 105-120 m a.s.l.) unambiguously connected to the drainage event yield a reference 10 Be production rate of 4.19 ± 0.20 atoms g-1 yr-1 for the CRONUS-Earth online calculator Lm scaling and 4.02 ± 0.18 atoms g-1 yr-1 for the nuclide specific LSD n scaling. We also recalibrate the reference 10 Be production rates for four sites in Norway and combine three of these with the Billingen results to derive a tightly clustered Scandinavian reference 10 Be production rate of 4.13 ± 0.11 atoms g-1 yr-1 for the CRONUS Lm scaling and 3.95 ± 0.10 atoms g-1 yr-1 for the LSD n scaling scheme.

The Bothnian Sea ice stream: early Holocene retreat dynamics of the south‐central Fennoscandian Ice Sheet

“…ka BP based on connection to ice-core chronology GICC05 by Stroeven et al 2015). ka BP based on connection to ice-core chronology GICC05 by Stroeven et al 2015).…”

“…The Bothnian Sea icestream event, however, has no corollary in the Swedish terrestrial retreat pattern, where varve-based reconstructions show steady retreat (Str€ omberg 1989). ka BP after Stroeven et al (2015). uniform lobe or a heterogeneous sector) are not clear.…”

“…The potential timing of the Bothnian Sea ice-stream event is several hundred years after the rapid warming that followed the Pre-Boreal Oscillation (11.47-11.35 ka: Stroeven et al 2015;Fig. Ice is not funnelled into the eastern trough of the Bothnian Basin; rather, the ice stream bypasses the head of the trough and flows onto the higher ground of Eystrasaltbanken, with no perturbation to either the direction or the morphology of its component MSGLs.…”

Deglaciation history of Lake Ladoga (northwestern Russia) based on varved sediments

“…Two moraines, the Salpausselk€ a I and II (Ss I & Ss II) to the north of Lake Ladoga, post-date the final deglaciation of the Ladoga basin (Saarnisto & Saarinen 2001;Rinterknecht et al 2006;Stroeven et al 2016). Following the ice retreat, Lake Ladoga became part of the Baltic Ice Lake (BIL), which drained in a catastrophic flood event into the North Sea at the end of the YD (Bj€ orck 1995; Jakobsson et al 2007;Bennike & Jensen 2013;Stroeven et al 2015). ka BP (Rinterknecht et al 2004(Rinterknecht et al , 2006.…”

“…Salpaus-selk€ a I, according to cosmogenic 10 Be exposure dating, formed during the Younger Dryas (YD) at around 12.5AE0.7 cal. a BP by Stroeven et al (2015). Following the ice retreat, Lake Ladoga became part of the Baltic Ice Lake (BIL), which drained in a catastrophic flood event into the North Sea at the end of the YD (Bj€ orck 1995; Jakobsson et al 2007;Bennike & Jensen 2013;Stroeven et al 2015).…”