Cosmic ray exposure ages, Wicklow Mountains, SE Ireland

Please cite:

Ballantyne C.K., McCarroll D. and Stone J.O. (2006)

Vertical dimensions and age of the Wicklow Mountains ice dome, Eastern Ireland, and implications for the extent of the last Irish ice sheet

Quaternary Science Reviews (in final revision), in reference to these data.

Sample OIS Grid Ref Latitude Longitude Altitude Scaling1 Scaling1 Thickness Horizon Be-10 prod'n rate2 [Be-10]3 Exposure age4 Internal error4
(deg N) (deg W) (m asl) (spallation) (muons) correction correction (atom/g/yr) (105 atom/g) (kyr) (kyr)
Samples from above mapped limit of glaciation
LQ-02 Lugnaquillia summit T 033917 52.9662 6.4624 920 2.383 1.581 0.965 1.000 11.56 ± 0.69 10.84 ± 0.21 95.88 ± 6.11 1.90
MC-02 Mullaghcleevaun summit O 068070 53.1029 6.4052 847 2.242 1.530 0.945 1.000 10.65 ± 0.63 6.59 ± 0.18 62.82 ± 4.18 1.78
MC-03 Mullaghcleevaun east O 082067 53.0999 6.3844 795 2.144 1.494 0.945 1.000 10.19 ± 0.60 6.82 ± 0.26 67.99 ± 4.86 2.61
TON-01 Tonelagee summit O 085016 53.0541 6.3817 810 2.172 1.504 0.953 1.000 10.41 ± 0.62 4.82 ± 0.11 46.86 ± 3.01 1.09
Samples from sites inferred to have been over-ridden by glacier ice
DJ-01 Djouce summit O 179103 53.1302 6.2383 725 2.019 1.447 0.961 1.000 9.77 ± 0.58 1.86 ± 0.04 19.11 ± 1.20 0.37
KAN-01 Kanturk summit O 125034 53.0694 6.3214 523 1.690 1.317 0.970 1.000 8.26 ± 0.49 1.50 ± 0.04 18.19 ± 1.17 0.44
SCA-01 Scarr summit O 134016 53.0531 6.3086 600 1.809 1.365 0.961 0.999 8.75 ± 0.52 1.61 ± 0.04 18.53 ± 1.19 0.43
1 Correction factor relative to 1013.25 mbar and latitude > 60 degrees (Lal, 1991; Stone, 2000).
2 Assumed Be-10 production rates: spallation: 4.95 ± 0.30 atom/g SiO2/yr, muon capture: 0.11 ± 0.02 atom/g SiO2/yr, at 1013.25 mbar and latitude > 60 degrees (Stone, 2000; Heisinger et al., 2002).
3 Measured relative to LLNL in-house Be-10/Be-9 standards, traceable to ICN Be-10 standard. Uncertainties propagated at ±1 sigma level including all known sources of analytical error.
4 Simple exposure ages, assuming no prior exposure and no erosion during exposure.
    Uncertainties are ±1 sigma (68% confidence) including Be-10 measurement uncertainties and an assumed uncertainty of ±6% in the Be-10 production rate, to allow comparison with ages obtained with other methods.
    Values in parentheses are uncertainties based on measurement errors alone, for sample-to-sample comparisons.