Concentrations of labile dissolved forms of Cu, Zn, Pb, and Cu in waters of the Kara Sea and Ob and Yenisey estuaries

Concentrations of labile dissolved forms of Cu, Zn, Pb, and Cu in waters of the Kara Sea and Ob and Yenisey estuaries measured on board during Cruise 49 of R/V Dmitry Mendeleev.

Isotopic composition of various forms of sulfur in barite crusts from the Red Sea rift

Barite crusts were formed by an intermittent hydrothermal vent with output temperature from 85 to 465°C. Principal sources of supply of sulfate sulfur are sea water, evaporites, and tholeiitic basalts of the Red Sea rift. Sulfides and sulfates were formed in conditions of isotope disequilibrium with respect to sulfur because rate of precipitation of sulfur compounds from hydrothermal solution was high compared with rate of isotope exchange.