Title:

Calibration of the in situ cosmogenic 14C production rate in New Zealand's Southern Alps

Author(s):

Schimmelpfennig, Irene Lois
Schaefer, Joerg M.
Goehring, Brent M.
Lifton, Nathaniel
Putnam, Aaron Ervin
Barrell, David J. A.

Date:

2012

Type:

Articles

Department:

Lamont-Doherty Earth Observatory

Permanent URL:

http://hdl.handle.net/10022/AC:P:14785

Book/Journal Title:

Journal of Quaternary Science

Abstract:

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.

Subject(s):

Geology

DOI:

http://dx.doi.org/10.1002/jqs.2566

Item views:

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