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 journalSpecial 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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