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 at the Southwest Research Institute in Boulder, Colorado, USA in July-August 2019, using the breadboard version of CODEX, the Chemistry, Organics, and Dating Experiment. The files are in plain text format. Following a one-row header that gives column headings, subsequent rows contain:<br> (1) A unique identifier for each 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 Rb87, Sr86, and Sr87 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 same units;<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; <br> (14-15) the ratio of Rb87/Sr86 and its 1-sigma uncertainty; <br> (16-17) the ratio of Sr87/Sr86 and its 1-sigma uncertainty; and<br> (18) the correlation coefficient between the Rb87/Sr86 ratio and the Sr87/Sr86 ratio.