Capabilities of the LamonteDoherty Earth Observatory in situ 14 C extraction laboratory updated

We report on the status and capabilities of the LamonteDoherty Earth Observatory in situ 14 C extraction laboratory. In late 2006 we began, in collaboration with the AMS group at the University of Arizona, construction of a new laboratory to extract in situ cosmogenic 14 C from terrestrial silicates. Long-term measurements of the process blank over the last two years give an arithmetic mean and standard deviation of 125 � 43 � 10 3 atoms 14 C( n ¼ 9) and show significant improvement in the number of atoms, as well as stability compared to initial measurements of the process blank. We report long-term measurements of the intercomparison material CRONUS-A, which has been developed as part of the CRONUS-Earth effort to characterize inter- and intra-laboratory variability. We interpret the standard deviation (5%) of six replicate measurements of CRONUS-A as the reproducibility of in situ 14 C extractions in our laboratory.

[1]  Preparation of small samples for 14C accelerator targets by catalytic reduction of CO. , 1987 .

[2]  T. Cerling,et al.  Cosmogenic 14C in carbonate rocks , 1999 .

[3]  R. Wieler,et al.  An update on in situ cosmogenic 14C analysis at ETH Zürich , 2013 .

[4]  M. Caffee,et al.  Recent erosional history of a soil profile based on cosmogenic in‐situ radionuclides 14C and 10Be , 2013 .

[5]  J. Quade,et al.  A new extraction technique and production rate estimate for in situ cosmogenic 14C in quartz , 2001 .

[6]  R. Alley,et al.  The Rhone Glacier was smaller than today for most of the Holocene , 2011 .

[7]  M. Kurz,et al.  Constraints on age, erosion, and uplift of Neogene glacial deposits in the Transantarctic Mountains determined from in situ cosmogenic 10Be and 26Al , 1995 .

[8]  R. Finkel,et al.  Landscape development in an hyperarid sandstone environment along the margins of the Dead Sea fault: Implications from dated rock falls , 2005 .

[9]  J. Pigati,et al.  A Simplified In Situ Cosmogenic 14C Extraction System , 2010, Radiocarbon.

[10]  M. Shea,et al.  Scaling time-integrated in situ cosmogenic nuclide production rates using a continuous geomagnetic model , 2008 .

[11]  B. Dugan,et al.  New production rate estimates for in situ cosmogenic 14 C , 2008 .

[12]  R. Wieler,et al.  The current performance of the in situ 14C extraction line at ETH , 2009 .

[13]  D. White,et al.  Can in-situ cosmogenic 14C be used to assess the influence of clast recycling on exposure dating of ice retreat in Antarctica? , 2011 .

[14]  G. Miller,et al.  A millennial perspective on Arctic warming from 14C in quartz and plants emerging from beneath ice caps , 2008 .

[15]  J. Schaefer,et al.  Calibration of the in situ cosmogenic 14C production rate in New Zealand's Southern Alps , 2012 .

[16]  G. Miller,et al.  Limited ice-sheet erosion and complex exposure histories derived from in situ cosmogenic 10Be, 26Al, and 14C on Baffin Island, Arctic Canada , 2006 .

[17]  R. Wieler,et al.  Quantifying denudation rates and sediment storage on the eastern Altiplano, Bolivia, using cosmogenic 10Be, 26Al, and in situ 14C , 2012 .