ГЕОХИМИЧЕСКИЕ ОСОБЕННОСТИ ОСАДКОВ ВПАДИНЫ ДЕРЮГИНА (ОХОТСКОЕ МОРЕ)

Abstract

Microelement distribution in the upper (up to 5 m) Holocene-Upper Pleistocene sediments along the northern and southern sublatitudinal profiles located in the northern part of the Deryugin trough is discussed. The mathematical data processing of the chemical analysis has been made. On the basis of the cluster analysis, 16 elements have been combined into 5 geochemical groups. One of them includes Ag and Mo, another - Mn, Ba, Ni and Sr. Analysis of Ag and Mo distribution in the sediments and findings of molybdenite permitted conclusion that the enrichment of the sediments by these elements resulted from the edaphic washing of magmatic rocks which form Ag/Mo mineralization and are probably located on the northwestern slope of the Deryugin truogh.. The other geochemical group is most likely to be connected with hydrothermal barytic mineralization revealed in the northeastern part. Considering the type of Mn distribution in the bottom sediment columns, the supply of Mn is pulsating in character. It allows us to conclude that during the Holocene - Late Pleistocene, three cycles of hydrothermal activity were recognized for the Deryugin trough. The most intensive hydrothermal activity occurred during the Holocene.