Application of a Novel Magnesium-Lithium Dual Isotopic Tracer to Biogeochemical Cycles in the Soil Critical Zone - Dr Heather Buss

Project Details


Chemical weathering exerts a key control on global CO2 cycles and ocean chemistry. Magnesium is a particularly important aspect of seawater chemistry, given that it controls the nature of carbonate precipitation is important tool in the reconstruction of past ocean temperatures. Stable isotopic tracers are increasingly being used to identify sources of Mg and other constituents in rivers and oceans and in marine sediments and sedimentary rocks to deduce paleoclimates, ancient ocean chemistry and circulation, and other aspects of Earth's history. However these interpretations are entirely dependent on the processes that may fractionate the isotopes during mineral weathering and (bio)geochemical cycling. This proposal seeks to develop a novel biogeochemical multi-tracer using Mg and Li isotopes and apply it to test and interrogate the hypothesis that the isotopic composition of Mg in rivers is influenced by chemical weathering reactions in catchment soils. In particular, it seeks to understand processes in soils, the ultimate reactor in which the riverine flux to the oceans is determined. As an intensive case study, the isotopic multi-tracer technique will be applied to a large set of natural samples previously obtained from the Luquillo Mountains in Puerto Rico.

This dataset will be used to demonstrate the potential of the multi-tracer technique and to move forward the models of biogeochemical mineral nutrient cycling that I am developing for the Luquillo Critical Zone Observatory (LCZO). The Mg-Li multi-tracer will also be applied on a global scale, by analyzing a large suite of soil samples from a variety of climates, latitudes, and rock types, which are currently archived by Professor Vance in Bristol.
Effective start/end date1/08/111/08/13

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  • Research Output

    • 1 Conference Contribution (Conference Proceeding)
    • 1 Article (Academic Journal)
    • 1 Special issue (Academic Journal)

    Influence of atmospheric deposits and secondary minerals on Li isotopes budget in a highly weathered catchment, Guadeloupe (Lesser Antilles)

    Clergue, C., Dellinger, M., Buss, H. L., Gaillardet, J., Benedetti, M. F. & Dessert, C., 30 Oct 2015, In : Chemical Geology. 414, p. 28-41 14 p., 17673.

    Research output: Contribution to journalArticle (Academic Journal)

    Open Access
  • 35 Citations (Scopus)
    257 Downloads (Pure)

    Controls on the Mg Cycle in the Tropics: Insights from a Case Study at the Luquillo Critical Zone Observatory

    Chapela-Lara, M., Buss, H., Pogge von Strandmann, P. A. E., Dessert, C. & Gaillardet, J., 2014, In : Procedia Earth and Planetary Science. 10, p. 200-203 4 p.

    Research output: Contribution to journalSpecial issue (Academic Journal)

    Open Access
  • 268 Downloads (Pure)

    Mg isotopes: insights into weathering in a tropical volcaniclastic regolith

    Chapela Lara, M., Buss, H. L., Pogge von Strandmann, P. A. E., Dessert, C. & Gaillardet, J., 2013, Mineralogical Magazine. Vol. 77. p. 855 1 p.

    Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

    Open Access
  • 37 Downloads (Pure)


    WEBB: USGS Water Energy and Biogeochemical Budgets

    Buss, H. L., Scholl, M., White, A. F. & Shanley, J.

    1/10/91 → …

    Project: Research


    LCZO: Luquillo Critical Zone Observatory

    Buss, H. L., Brantley, S. L., Scatena, F. N., Silver, W., Plante, A., Willenbring, J., McDowell, W., Shanley, J., White, A. F., Scholl, M., Johnson, A., Jerolmack, D., Horton, B., Chapela Lara, M. & Moore, O. W.


    Project: Research