Geochemical characteristic of belemnite as reflection of change of paleoecologic condition of sea basins

The precision geochemical (LA-ICP-MS) study of belemnite rostra from Jurassic sediments of the Sysola Basins (Republic of Komi) is presented. It is shown that belemnite rostra are heterogeneous chemical system with significant variations in the distribution of trace elements. Several levels of cyclic change of trace elements content in along the belemnites growth rings were identified. This can be due to paleoecologycal conditions changes of sea basins.