Silver and copper fractionation in MORB

Ag and Cu are strongly chalcophile elements, and their behavior in magmatic systems is highly dependent on the presence of solid or liquid sulfide phase in magmas and their sources..

Thematic issue: isotopic geochemistry of mineral deposits—implication for ore genesis

[Extract] Mineralization involves several processes, of which chemical processes are the ones that finally result in precipitation of metals or formation of minerals. Thus, geochemistry is an important field in the study of mineral deposits. Geochemical (e.g. elemental, isotopic, etc.) characterization of mineral deposits is important in (i) understanding ore genesis, (ii) mineral deposit classification, (iii) mineral exploration, (iv) extractive metallurgy or mineral processing, and (v) geoenvironmental research. This thematic issue of Resource Geology is devoted to isotopic geochemistry of mineral deposits for understanding of ore genesis

Geochemistry and isotopic ratios of basalts obtained during R/V Akademik Nikolaj Strakhov cruise ANS25

Based on the investigation of samples recovered during Cruise 25 of the R/V ''Akademik Nikolai Strakhov'', the character of magmatism was determined in the flank parts of the rift zone at the 74°05'N and 73°50'N region, where the direction of the rift valley changes from the north-northwest in the Knipovich Ridge to the northeast-trending structures of the Mohns Ridge. It was shown that the tholeiitic magmas of this region shows all the geochemical characteristics of TOR-2, which is typical of the Mohns Ridge and most oceanic rift zones worldwide, and differ from the basalts of the Knipovich Ridge, which are assigned to a shallower type of tholeiitic magmatism (Na-TOR). The persistent depletion of the magmas in terms of lithophile element contents and radiogenic isotope ratios of Sr, Nd, and Pb reflects the conditions of their formation during the ascent of the depleted oceanic mantle, which has occurred without significant complications since the early stages of the formation of the Mohns Ridge