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Cosmogenic 26Al/10Be surface production ratio in Greenland
Ist Teil von
Geophysical research letters, 2017-02, Vol.44 (3), p.1350-1359
Ort / Verlag
Washington: Blackwell Publishing Ltd
Erscheinungsjahr
2017
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The assumed value for the cosmogenic 26Al/10Be surface production rate ratio in quartz is an important parameter for studies investigating the burial or subaerial erosion of long‐lived surfaces and sediments. Recent models and data suggest that the production ratio is spatially variable and may be greater than originally thought. Here we present measured 26Al/10Be ratios for 24 continuously exposed bedrock and boulder surfaces spanning ~61–77°N in Greenland. Empirical measurements, such as ours, include nuclides produced predominately by neutron‐induced spallation with percent‐level contributions by muon interactions. The slope of a York regression line fit to our data is 7.3 ± 0.3 (1σ), suggesting that the 26Al/10Be surface production ratio exceeds the commonly used value of 6.75, at least in the Arctic. A higher 26Al/10Be production ratio has implications for multinuclide cosmogenic isotope studies because it results in greater modeled burial durations and erosion rates.
Key Points
The cosmogenic 26Al/10Be production ratio in quartz is higher than traditionally thought and likely varies with latitude/altitude
Using continually exposed rock surfaces in Greenland, we constrain the high‐latitude 26Al/10Be production ratio to 7.3 ± 0.3
A higher assumed 26Al/10Be production ratio results in greater modeled burial durations and erosion rates