CODEX Rb and Sr isotopic data of granites

The files in this archive represent Rb and Sr isotopic compositions of hundreds of spot analyses on the Boulder Creek Granite and the Pikes Peak Granite. Data were acquired using CODEX, the Chemistry, Organics, and Dating Experiment, using the prototype instrument at the Southwest Research Institute in Boulder, Colorado, USA, in July-August 2019. The files are in plain text format. As indicated by the header, each row contains:<br> (1) A unique identifier for the spot analysis;<br> (2-4) 3 columns representing the position of the analysis spot (in mm) relative to a fiducial spot on the sample holder (this permits the construction of an isotopic map of the sample);<br> (5-7) the isotopic abundances for Rb-87, Sr-86, and Sr-87 in units of V*ns, i.e., the product of peak height and duration;<br> (8-10) the 1-sigma uncertainties in each of those isotope abundances, in the units; and<br> (11-13) the correlation coefficients (dimensionless) between fluctuations in the isotope pairs (Rb-87,Sr-86), (Sr-86,Sr-87), (Rb-87,Sr-87). These are important because the uncertainties in the isotope abundances are strongly correlated with one another, making the uncertainties in their ratios smaller than the uncertainty in individual abundances might suggest.