Schimmelpfennig Irene Lois author Columbia University. Lamont-Doherty Earth Observatory Schaefer Joerg M. author Columbia University. Earth and Environmental Sciences Columbia University. Lamont-Doherty Earth Observatory Goehring Brent M. author Lifton Nathaniel author Putnam Aaron Ervin author Columbia University. Lamont-Doherty Earth Observatory Barrell David J. A. author Columbia University. Lamont-Doherty Earth Observatory originator text Articles 2012 manuscript version English In situ cosmogenic 14C (in situ 14C) analysis from quartz-bearing rocks is a novel isotopic tool useful for quantifying recent surface exposure histories (up to ∼25 ka). It is particularly powerful when combined with longer-lived cosmogenic isotopes such as 10Be. Recent advances in the extraction of in situ 14C from quartz now permit the routine application of this method. However, only a few experiments to calibrate the production rate of in situ 14C in quartz have been published to date. Here, we present a new in situ 14C production rate estimate derived from a well-dated debris flow deposit in the Southern Alps, New Zealand, previously used to calibrate 10Be production rates. For example, based on a geomagnetic implementation of the Lal/Stone scaling scheme we derive a spallogenic production rate of 11.4 ± 0.9 atoms 14C (g quartz)−1 a−1 and a 14C/10Be spallogenic production rate ratio of 3.0 ± 0.2. The results are comparable with production rates from previous calibrations in the northern hemisphere. Geology http://dx.doi.org/10.1002/jqs.2566 http://hdl.handle.net/10022/AC:P:14785 NNC NNC 2012-09-27 14:50:17 -0400 2012-09-27 15:00:56 -0400 8793 eng