This site from Dr. Bernie Gunn offers a brief description of volcanic and igneous centers world-wide (and some associated sediments) for which there is reasonable data. The site features regional variation diagrams as well as multi-element fingerprint analyses and data for rare earth elements, metals, and alkaline earth trace elements. The site also includes fractionation diagrams, comparisons between the different types of basalts and other fundamental magma types, graphic comparisons between centers of similar and dissimilar type, and the primary basaltic parental magma trends. The data is continuously updated. In addition, surveys are given of the more important elements, their fractionation paths, their distributions in major rock types, locales where the greatest abundances are likely to be found, and their ratios to related or similar elements.