In situ cosmogenic super(10)Be production-rate calibration from the Southern Alps, New Zealand

We present a super(10)Be production-rate calibration derived from an early Holocene debris-flow deposit at about 1000 m above sea level in the central Southern Alps, New Zealand, in the mid-latitude Southern Hemisphere. ten radiocarbon ages on macrofossils from a soil horizon buried by the deposit date the deposit to 9690 +/- 50 calendar years before AD2008. Surface super(10)Be concentrations of seven large boulders partially embedded in the stable surface of the deposit are tightly distributed, yielding a standard deviation of [not, vert, similar]2%. Conversion of the super(10)Be measurements to sea level/high-latitude values using each of five standard scaling methods indicates super(10)Be production rates of 3.84 +/- 0.08, 3.87 +/- 0.08, 3.83 +/- 0.08, 4.15 +/- 0.09, and 3.74 +/- 0.08 atoms g super(-1) a super(-1), relative to the '07KNSTD' super(10)Be AMS standard, and including only the local time-integrated production-rate uncertainties. When including a sea level high-latitude scaling uncertainty the overall error is [not, vert, similar]2.5% (1[sigma]) for each rate. To test the regional applicability of this production-rate calibration, we measured super(10)Be concentrations in a set of nearby moraines deposited before 18 060 +/- 200 years before AD2008. The super(10)Be ages are only consistent with minimum-limiting super(14)C age data when calculated using the new production rates. This also suggests that terrestrial in situ cosmogenic-nuclide production did not change significantly from Last Glacial Maximum to Holocene time in New Zealand. Our production rates agree well with those of a recent calibration study from northeastern North America, but are 12-14% lower than other commonly adopted values. The production-rate values presented here can be used elsewhere in New Zealand for rock surfaces exposed during or since the last glacial period.