Apatite Application to Investigate Magmatic Evolution of Zouzan Granites, NE Lut Block

Apatite minerals of i-type zouzan granitoids and typical garnet-bearing s-type granites have been analyzed by electronmicroprobe to define trace element concentrations and compare them in different granites. zouzan granites are composed of apatiteswith lower fe, mn, na and hree and higher ree and ?ree relative to s-type ones. trace elements abundances of apatite oftenvary with some parameters of the host rock, especially aluminum saturation index (asi). strontium content of apatite is verysensitive to whole-rock composition and binary diagrams of sro- trace elements could be used to discriminate different granites andrealize magmatic evolution in a single phase. the apatite concentration of fe, mn, na and hree increases during magmaticfractionation in zouzan pluton, while sr and ree decreases. the difference of ree concentrations in apatites of mafic and felsicrocks of zouzan granitoids relates to the coeval or earlier crystallization of amphibole and titanite, respectively. acicular apatiteswhich are present in granodiorites and mafic microgranular enclaves show exceptionally dissimilar composition in comparison withother apatites in the same sample and host rock geochemistry. extraordinary high levels of fe, mn, lree, (srapatite/srbulk-rock) > 1 andunusual low hree indicate that a more mafic magma was involved in magma genesis of zouzan pluton and confirms magmamixing.