Geochemistry

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Faculty

  • Ronit  Kessel

    Ronit Kessel

    Associate Professor
    Head of the Geology Program
    +972-2-65-85584
    ronit.kessel@mail.huji.ac.il
    Room 210 South

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    The combination of experimental petrology and thermodynamic modeling provides powerful insights into the igneous and metamorphic processes by which Earth and other planets evolved.  My research involves the development of experimental techniques together with modeling of the experimental data to constrain the nature of both terrestrial and extraterrestrial environments through the study of synthetic analogs. 

    The topics I am currently involved with:

    Melt and fluid compositions in equilibrium with mantle material. Aqueous fluids play an important role in melting and metasomatism of the Earth’s mantle; I study the role of volatiles (H2O, CO2, etc.) in dehydration/hydration and melting processes in the mantle.

    The evolution of meteorite groups. Samples delivered to the Earth as meteorites provide us with a unique opportunity to study the timing and the processes by which our solar system formed and evolved.  I combine both experimental and analytical methods to understand the formation conditions of different groups of meteorites.

     

    Curriculum Vitae

     

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  • Boaz  Lazar

    Boaz Lazar

    Professor
    972-2-65-86535
    boaz.lazar@mail.huji.ac.il
    Room 5 South

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    Research interests: 

    My research has been focused on geochemical and biogeochemical processes at and near natural interfaces such as between water (saline/fresh) and rocks (or sediments or particles) and water-atmosphere boundaries. The research covers a wide-scale variety of geological environments. I have studied fluid inclusions within crystals, microgradients between seawater and electrode surfaces, stromatolites (microbial mats), coral reefs, porewaters within corals and sediments, floods and the open sea water column. A brief description of the research activities:Sr isotopes in ground waters as tracers of the calcite-calcite and calcite-dolomite transformations; Fluid inclusions in halite and the reconstruction of the chemical evolution of the oceans during the geological history; Diagenesis of reef corals and the distribution of trace elements (proxies for paleo-oceanographic conditions) between coralline aragonite and seawater; The fate of manganese in the soil-aquifer treatment of a sewage reclamation system; Isotopic effect of CO2 influx across brine-atmosphere interface induced by intense photosynthesis; 14C fluxes into marine sediments, across freshwater seawater interface, flood water and radiocarbon budgets; Carbon, oxygen and nutrients variations in coral reefs emphasizing the role of bioeroders, the decrease in reef calcification due to eutrophication, and suggesting that reefs will stop to grow on atmospheric CO2 doubling; Nutrients budget of the northern Gulf of Aqaba, Red Sea that enable to determine the role of fish farming in the eutrophication of that oligotrophic basin; Using the disequilibrium in the U-Th series, the cosmogenic isotopes 14C and 10Be for identifying atmospheric exchange, flood intensity, fluxes into porewater and water dating and analyzing the open system effect on dating corals by the U-Th method and studying water fluxes and adsorption/desorption kinetics. 4)
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