For the whole-rock analyses, major- and minor-element oxides were determined by ALS using X-ray fluorescence spectrometry following a lithium borate fusion. In order to check reported major- and minor-element oxide and trace-element values, DGGS inserts well-characterized rock standards in each laboratory batch throughout the sample order. Standards are checked by DGGS to make sure they fall within 2 standard deviations of accepted values, and if not, all samples in the batch are reanalyzed.