Regional beryllium-10 production rate calibration for late-glacial northeastern North America

On the reconstruction of palaeo-ice sheets: Recent advances and future challenges

“…Several recent 10 Be production rate calibration studies have reported 5-15% lower reference 10 Be production rates (e.g. Balco et al, 2009;Young et al, 2013;Heyman, 2014) compared to the original CRONUS production rates (e.g. Balco et al, 2008), implying that many exposure ages are likely to be thousands of years older than previously reported.…”

“…In Switzerland, for example, Andree et al (1986) found an 800-year offset in radiocarbon age between bulk sediment and AMS plant macrofossil ages for the late-glacial interval, while offsets of up to 8 ka occur in basal lake sediments in central North America (Grimm et al, 2009). In another example, the initiation of 13 lakes/bogs across a landscape previously covered by the south-eastern LIS provided a tight cluster of AMS ages between 16 and 15 ka (Peteet et al, 2012), which is 5-9 ka later than the time of ice retreat based upon the extrapolation of bulk chronologies (Dyke et al, 2003), varves (Ridge, 2004), and cosmogenic dates (Balco et al, 2009). …”

The Roussillon Basin (S. France): A case-study to distinguish local and regional events between 6 and 3 Ma

“…A sea-level, high-latitude (SLHL) spallation production of 4.03±0.18 at g -1 yr -1 was used and scaled for latitude (Stone, 2000) and elevation. This production rate, recently used by Molliex et al, (2013) in the same area is based from weighted mean of the most recently calibrated production rates in the Northern Hemisphere (Northeastern North America (Balco et al, 2009), Northern Norway (Fenton et al, 2011), Southern Norway and Greenland (Briner et al, 2012). The production rate is calculated for each cells of the present-day DEM constituting the catchment and the mean catchment production rate value is calculated by averaging the values of quartz-producing rocks areas following the method described by Delunel et al, (2010) and using the script of Balco (2001) for the calculation of the shielding factor.…”

Applying the Cosmogenic Nuclide Dipstick Model for Deglaciation of Mt. Washington

“…4), owing to considerable 14 C dating of lakes and bogs, and in particular, extensive varve sequences, which have been tied to the 14 C timescale and the Greenland ice core record (Ridge et al, 2004(Ridge et al, , 2012. Furthermore, 10 Be ages from the Connecticut and Champlain Valley lowlands have also been linked to these other chronometers, resulting in a precise regional production rate calibration (Balco et al, 2009). This well-dated margin record makes the region especially conducive to constraining ice volume changes and understanding ice sheet behavior, if, and only if, the thinning history can be well determined.…”