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3 results

Magnesium Isotopes

Magnesium Isotopes
  • Tracer for the Global Biogeochemical Cycle of Magnesium Past and Present or Archive of Alteration?
  • Edward T. Tipper
  • Published online:
    07 February 2022
    Print publication:
    03 March 2022
  • Magnesium is a major constituent in silicate and carbonate minerals, the hydrosphere and the biosphere. Magnesium is constantly cycled between these reservoirs. Since each of the major planetary reservoirs of magnesium have different magnesium isotope ratios, there is scope to use magnesium isotope ratios to trace 1) the processes that cycle Magnesium at a spatial scales from the entire planet to microscopic and 2) the relative fluxes between these reservoirs. This review summarises some of the key motivations, successes and challenges facing the use of magnesium isotopes to construct a budget of seawater magnesium, present and past.

  • 6 - Equilibrium Models of NaturalWaters

  • from PART I - EQUILIBRIUM IN NATURAL WATERS
  • Craig M. Bethke, University of Illinois, Urbana-Champaign
  • Book:
    Geochemical and Biogeochemical Reaction Modeling
    Published online:
    09 December 2021
    Print publication:
    06 January 2022, pp 67-86

  • Summary

    Calculated models of the chemistry of natural waters show how mass is distributed among aqueous species, minerals, and gases, whether individual minerals are undersaturated or supersaturated, and gas partial pressures within the waters. This chapter explores how to construct and interpret computed models of water chemistry, using seawater, river water, and deep-sea brines as examples.

Pelagic Barite

Pelagic Barite
  • Tracer of Ocean Productivity and a Recorder of Isotopic Compositions of Seawater S, O, Sr, Ca and Ba
  • Weiqi Yao, Elizabeth Griffith, Adina Paytan
  • Published online:
    23 December 2020
    Print publication:
    28 January 2021
  • Reconstruction of ocean paleoproductivity and paleochemistry is paramount to understanding global biogeochemical cycles such as the carbon, oxygen and sulfur cycles and the responses of these cycles to changes in climate and tectonics. Paleo-reconstruction involves the application of various tracers that record seawater compositions, which in turn may be used to infer oceanic processes. Several important tracers are incorporated into pelagic barite, an authigenic mineral that forms in the water column. Here we summarize the utility of pelagic barite for the reconstruction of export production and as a recorder of seawater S, O, Sr, Ca and Ba.