Projects per year
To better constrain the mechanisms controlling short-term Mg dynamics in the tropics, we sampled critical zone compartments of a catchment covered by thick, highly weathered regolith. Our Mg and δ26Mg data indicate that rain is a main source of Mg throughout the regolith, and we do not observe Mg isotope offsets in vegetation/surficial pore water. In addition to rain and weathering inputs, a heavy isotope excursion at ∼1 m depth indicates a fractionation process, likely sorption-desorption or clay dissolution. Stream water δ26Mg reflects inputs from rain and a heavy source, likely differential weathering along deep bedrock fractures.
Bibliographical noteConference proceeding: Geochemistry of the Earth's surface GES-10 Paris France, 18-23 August, 2014.
- Mg cycle
- Tropical Weathering
- Mg isotopes
- Critical Zone
ISOCRIT: Application of a Novel Magnesium-Lithium Dual Isotopic Tracer to Biogeochemical Cycles in the Soil Critical Zone - Dr Heather Buss
1/08/11 → 1/08/13
Chapela-Lara, M., Buss, H., Pogge von Strandmann, P. A. E., Dessert, C., & Gaillardet, J. (2014). Controls on the Mg Cycle in the Tropics: Insights from a Case Study at the Luquillo Critical Zone Observatory. Procedia Earth and Planetary Science, 10, 200-203. https://doi.org/10.1016/j.proeps.2014.08.019