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

doi:10.1016/j.proeps.2014.08.019

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

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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 language	English
Pages (from-to)	200-203
Number of pages	4
Journal	Procedia Earth and Planetary Science
Volume	10
Early online date	26 Aug 2014
DOIs	https://doi.org/10.1016/j.proeps.2014.08.019
Publication status	Published - 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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10.1016/j.proeps.2014.08.019

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Projects

2 Finished

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

Kendall, M., Buss, H. L. & Chapela Lara, M.

1/08/11 → 1/08/13

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.

1/10/10 → 30/09/13

Project: Research

Cite this

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

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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.",

keywords = "Mg cycle, Tropical Weathering, Mg isotopes, Critical Zone, Regolith, Soil",

author = "Maria Chapela-Lara and Heather Buss and {Pogge von Strandmann}, {Philip A E} and Celine Dessert and Jerome Gaillardet",

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

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doi = "10.1016/j.proeps.2014.08.019",

language = "English",

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T2 - Insights from a Case Study at the Luquillo Critical Zone Observatory

AU - Chapela-Lara, Maria

AU - Buss, Heather

AU - Pogge von Strandmann, Philip A E

AU - Dessert, Celine

AU - Gaillardet, Jerome

N1 - Conference proceeding: Geochemistry of the Earth's surface GES-10 Paris France, 18-23 August, 2014.

PY - 2014

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N2 - 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.

AB - 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.

KW - Mg cycle

KW - Tropical Weathering

KW - Mg isotopes

KW - Critical Zone

KW - Regolith

KW - Soil

U2 - 10.1016/j.proeps.2014.08.019

DO - 10.1016/j.proeps.2014.08.019

M3 - Special issue (Academic Journal)

VL - 10

SP - 200

EP - 203

JO - Procedia Earth and Planetary Science

JF - Procedia Earth and Planetary Science

SN - 1878-5220

ER -