The CREp program and the ICE-D production rate calibration database: A fully parameterizable and updated online tool to compute cosmic-ray exposure ages

Abstract

CREp is able to calculate a large number of ages in a reasonable time (typically < 30 s for 50 samples). The user may export a summary table of the computed ages and the density probability function associated with each age (in the form of a spreadsheet).

Basinga: A cell‐by‐cell GIS toolbox for computing basin average scaling factors, cosmogenic production rates and denudation rates

“…(), modified by Martin et al . (). The Production rates tool calculates the basin average production rates based on the SLHL rates provided in Martin et al .…”

“…For the LSD model, we used the Matlab® functions of Lifton (), which were amended by Martin et al . () to test for different dipolar geomagnetic corrections. When using the Lal/Stone scheme the time was not integrated and we used only the present‐day scaling factors.…”

“…10 Be cosmogenic production rates were calculated based on the SLHL rate of 4.11 of Martin et al . () (see their Table 7). We followed the approach and database proposed by Balco () to accurately estimate the attenuation length of muons in the rocks as a function of the denudation and elevation (Figure ).…”

“…where P i,x,SLHL is the surface production at sea level and high latitude (SLHL) (atoms g À1 year À1 ) for each nuclide i and production pathway x. Global average values for the SLHL production rates of different nuclides have recently been constrained by Martin et al (2017; see their Table 7), taking into account all published calibration studies, notably the most recent ones (Balco et al, 2009;Kaplan et al, 2011;Lifton et al, 2014;Kelly et al, 2015;Martin et al, 2015;Stroeven et al, 2015). These worldwide averages were computed using the CREp program (Martin et al, 2017) and include a time-integration correction based on the virtual dipole moment (VDM) reconstructed by Muscheler et al (2005).…”

“…We used both the LSD (Lifton, 2015) and Lal/Stone (Lal, 1991;Stone, 2000) schemes to estimate the scaling factors and production rates in each cell based on the cell's latitude, longitude and elevation. For the LSD model, we used the Matlab® functions of Lifton (2015), which were amended by Martin et al (2017) to test for different dipolar geomagnetic corrections. When using the Lal/Stone scheme the time was not integrated and we used only the present-day scaling factors.…”