Depositional environment of formation of the cherty rocks of the Sikhote-Alin taukha terrain (on geochemical data)

Abstract

The results of a comparative geochemical study of the cherts and siliceous-clayey rocks composing the tectono-sedimentary complexes of the Taukhinsky terrain different structural levels are presented. It is shown that same-aged portions of the cherty-terrigenous sections of the lower and middle structural levels of the terrane are characterized by significant differences in both the content and distribution of the main petrogenic oxides, micro- and rare-earth elements, which is due to their accumulation in a different oceanic facies zones. From set of the geochemical data, it is established that the formation of sections of the tectono-sedimentary complexes was carried out within the successively replacing each other oceanic facial zones , starting from the spreading ridge area, then in the pelagial and completed in the continental-margin sedimentation area.