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

Maria Chapela-Lara, Heather Buss, Philip A E Pogge von Strandmann, Celine Dessert, Jerome Gaillardet

Research output: Contribution to journal › Special issue (Academic Journal) › peer-review

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Abstract

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.
Original languageEnglish
Pages (from-to)200-203
Number of pages4
JournalProcedia Earth and Planetary Science
Volume10
Early online date26 Aug 2014
DOIs
Publication statusPublished - 2014

Bibliographical note

Conference proceeding: Geochemistry of the Earth's surface GES-10 Paris France, 18-23 August, 2014.

Keywords

  • Mg cycle
  • Tropical Weathering
  • Mg isotopes
  • Critical Zone
  • Regolith
  • Soil

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    • 4 Article (Academic Journal)
    • 1 Conference Contribution (Conference Proceeding)
    View all 5 research outputs

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

      Kendall, M. (Principal Investigator), Buss, H. L. (Principal Investigator) & Chapela Lara, M. (Student)

      1/08/11 → 1/08/13

      Project: Research

    • LCZO: Luquillo Critical Zone Observatory

      Buss, H. L. (Co-Investigator), Brantley, S. L. (Co-Investigator), Scatena, F. N. (Principal Investigator), Silver, W. (Co-Investigator), Plante, A. (Principal Investigator), Willenbring, J. (Co-Investigator), McDowell, W. (Principal Investigator), Shanley, J. (Co-Investigator), White, A. F. (Other ), Scholl, M. (Co-Investigator), Johnson, A. (Co-Investigator), Jerolmack, D. (Co-Investigator), Horton, B. (Co-Investigator), Chapela Lara, M. (Student) & Moore, O. W. (Student)

      1/10/10 → 30/09/13

      Project: Research

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