Carbon-saturated COH fluids in the upper mantle: a review of high-pressure and high-temperature ex situ experiments
Articolo
Data di Pubblicazione:
2022
Citazione:
Carbon-saturated COH fluids in the upper mantle: a review of high-pressure and high-temperature ex situ experiments / C. Tiraboschi, F. Miozzi, S. Tumiati. - In: EUROPEAN JOURNAL OF MINERALOGY. - ISSN 1617-4011. - 34:1(2022), pp. 59-75. [10.5194/ejm-34-59-2022]
Abstract:
High-pressure COH fluids have a fundamental role in a variety of geological processes. Their composition
in terms of volatile species can control the solidus temperature and carbonation/decarbonation reactions,
as well as influence the amount of solutes generated during fluid–rock interaction at depth. Over the last decades,
several systems have been experimentally investigated to unravel the effect of COH fluids at upper-mantle conditions.
However, fluid composition is rarely tackled as a quantitative issue, and rather infrequently fluids are
analyzed in the same way as the associated solid phases in the experimental assemblage. A comprehensive characterization
of carbon-bearing aqueous fluids in terms of composition is hampered by experimental difficulties
in synthetizing and analyzing high-pressure fluids without altering their composition upon quenching.
Recently, improved techniques have been proposed for the analyses of experimental carbon-saturated COH
fluids, leading to a significant advancement in synthetic fluid characterization. Here, we present a review of
carbon-bearing aqueous fluid experiments conducted at lower-crust and upper-mantle P–T (pressure and temperature)
conditions, in which fluids have been characterized quantitatively through ex situ techniques.We review
the experimental background of the most commonly employed thermodynamic models for COH fluids, together
with the techniques to synthetize them and analyze their composition when the fluid coexists with solid phases.
We highlight how a quantitative approach to COH fluid analyses is a fundamental step to understand the effect
of these fluids at upper-mantle conditions and to provide a strong experimental foundation to thermodynamic
models to ultimately unravel the deep cycling of elements.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
C. Tiraboschi, F. Miozzi, S. Tumiati
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