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An experimental study on smectites as nitrogen conveyors in subduction zones

Cedeno, Daniel Grings (author)
Univ Fed Rio Grande do Sul, Brazil
Conceicao, Rommulo Vieira (author)
Univ Fed Rio Grande do Sul, Brazil
Wilbert de Souza, Marcio Roberto (author)
Univ Fed Rio Grande do Sul, Brazil.
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Schimdt Quinteiro, Roberto Vicente (author)
Univ Fed Rio Grande do Sul, Brazil
Carniel, Larissa Colombo (author)
Univ Fed Rio Grande do Sul, Brazil
Ketzer, João Marcelo (author)
Pontificia Univ Catolica Rio Grande Sul PUCRS, Brazil
Rodrigues, Frederico (author)
Pontificia Univ Catolica Rio Grande Sul PUCRS, Brazil
Bruzza, Eduardo do Canto (author)
Pontificia Univ Catolica Rio Grande Sul PUCRS, Brazil
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Univ Fed Rio Grande do Sul, Brazil Univ Fed Rio Grande do Sul, Brazil (creator_code:org_t)
Elsevier, 2019
2019
English.
In: Applied Clay Science. - : Elsevier. - 0169-1317 .- 1872-9053. ; 168, s. 409-420
Related links:
https://urn.kb.se/re...
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https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • We performed high pressure and high temperature (HPHT) experiments on NH4-doped montmorillonite (similar to 2 wt % of NH4) under pressures of 2.5, 4.0, and 7.7 GPa and temperatures from 200 to 700 degrees C. Each experiment was analyzed with XRD, FTIR, CHN elemental analysis, and SEM in order to determine the NH4-Smectite phase changes and their morphology, and the presence of ammonium in the runs. Our results show that smectite can easily transport nitrogen, speciated as ammonium (NH4+), incorporated into the smectite interlayer in mildly reducing environments to deeper levels in the Earth through cold thermal regime subduction zones. NH4-Smectite transforms into NH4-enriched micaceous phase (tobelite) through a NH4+-enriched interlayered I/S phase in relatively low pressures and temperatures (around 2.5 GPa and 500 degrees C). Tobelite is stable until more extreme conditions (7.7 GPa and 700 degrees C), together with lesser amounts of buddingtonite (an ammonium-bearing feldspar) kyanite, and garnet. Our experiments also show the effect of nitrogen in the feldspar stability, as potassic and sodic feldspar are stable up to similar to 5 GPa, while buddingtonite, is observed to be stable up to 7.7 GPa. Nitrogen can return to the surface once the stability of these nitrogen-enriched minerals is reached due to pressure or temperature increasing.

Subject headings

NATURVETENSKAP  -- Geovetenskap och miljövetenskap (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences (hsv//eng)

Keyword

Nitrogen
Subduction zones
Ammonium
Pelagic sediments
Miljövetenskap
Environmental Science

Publication and Content Type

ref (subject category)
art (subject category)

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