Processes noble gas mass spectrometer data to determine the isotopic composition of argon (comprised of Ar36, Ar37, Ar38, Ar39 and Ar40) released from neutronirradiated potassiumbearing minerals. Then uses these compositions to calculate precise and accurate geochronological ages for multiple samples as well as the covariances between them. Error propagation is done in matrix form, which jointly treats all samples and all isotopes simultaneously at every step of the data reduction process. Includes methods for regression of the timeresolved mass spectrometer signals to t=0 ('time zero') for both single and multicollector instruments, blank correction, mass fractionation correction, detector intercalibration, decay corrections, interference corrections, interpolation of the irradiation parameter between neutron fluence monitors, and (weighted mean) age calculation. All operations are performed on the logs of the ratios between the different argon isotopes so as to properly treat them as 'compositional data', sensu Aitchison [1986, The Statistics of Compositional Data, Chapman and Hall].
Package details 


Author  Pieter Vermeesch [aut, cre] 
Date of publication  20150826 23:00:14 
Maintainer  Pieter Vermeesch <p.vermeesch@ucl.ac.uk> 
License  GPL2 
Version  0.2 
Package repository  View on CRAN 
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