PIXE analysis of apatite from granitic pegmatite dikes near cross lake

The study of the elements in 31 accessory apatites in pegmatite field illustrates the usefulness of PIXE in the measurement of elements in rocks and minerals. Based on the elemental composition results, the behavior of REE and other trace elements within the pegmatite system is discussed, the concentration distribution of the substitution elements in apatite to their locations in the field and to the geochemical characteristics of the K-feldspars. The average cK/cRb value for the core margin K-feldspars is considered as a reliable indicator of the general level of the fractionation by the pegmatite. Consequently the element concentration distribution trend due to fractionation may be illustrated by a plot of it against the cK/cRb ratio