干旱区生态环境知识资源中心

Remnants of dinosaurs and other representatives of Cretaceous fauna of Southern Mongolia are enriched in REE independently on their locality, age, morphology, and species as well as with no relations to processes of sedimentation, diagenesis, and epigenesis. Significant anisotropy in REE distribution among various morphologic types of the dinosaur remnants as well as tortoises evidences on the life formation of the REE specifics of the Cretaceous vertebrates including presence of close relations between geochemical peculiarities of the bone remnants and biogeochemical ones of the bone fissues of the vertebrates. During the Late Cretaceous the accumulation of REE, first of all the heavy lanthanoids and yttrium, occurs so the remnants of Maestrichtian and especially Late Maestrichtian age are mostly enriched in REE. This trend is correlated with some characteristic of evolution of abiotic part of biosphere in Late Cretaceous of Southern Mongolia - increasing of the climate aridization and the landscape desertization.