Fluid‐Induced Processes: Metasomatism and Metamorphism

Putnis, Andrew; Austrheim, Håkon

doi:10.1002/9781444394900.ch18

Cited by 108 publications

(133 citation statements)

References 94 publications

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“…This is because rehydration reactions generally require water to produce low-temperature hydrous minerals (e.g., Yardley et al 2014). Therefore, retrogressive metamorphism is generally considered to be fluidinduced (e.g., Andersen et al 1991;Putnis and Austrheim 2010), such that the driving forces of rehydration can be assumed to be water infiltration in addition to changes in temperature and pressure.…”

Section: Rehydration Reactionsmentioning

confidence: 99%

“…From these textures, rehydration reactions are commonly considered to proceed under non-equilibrium conditions with the decomposition or replacement of nonequilibrium components, such as unstable minerals or the unstable portions of minerals that are components of stable mineral assemblages (e.g., Vernon 2004;Ota et al 2004;Okamoto and Toriumi 2005;Putnis 2009;Putnis and Austrheim 2010;Putnis and John 2010). For example, higher-grade non-equilibrium minerals such as garnet, omphacite, and kyanite are decomposed to produce lower-grade minerals such as amphibole, plagioclase, and paragonite (e.g., Yang 2004).…”

Section: Rehydration Reactionsmentioning

confidence: 99%

“…The mechanism of replacement reactions generally involves coupling of dissolution and precipitation at the interfaces of non-equilibrated minerals (e.g., Imon et al 2002;Okamoto and Toriumi 2005;Putnis 2009;Putnis and Austrheim 2010;Centrella et al 2015). Figure 1 shows a retrogressed mafic schist in a metamorphic rock from the Sanbagawa metamorphic belt in SW Japan.…”

Section: Rehydration Reactionsmentioning

confidence: 99%

“…Rehydration reactions commonly proceed heterogeneously in a non-equilibrium state (e.g., Brodie and Rutter 1985;Plunder et al 2012), whereas dehydration reactions occur under relatively homogeneous conditions in a perfect equilibrium state. As described in detail in the next section, rehydration reactions are generally fluid-induced and occur via replacement of relict minerals by equilibrated minerals (e.g., Andersen et al 1991;Imon et al 2002;Ota et al 2004;Okamoto and Toriumi 2005;Putnis 2009;Putnis and Austrheim 2010;Centrella et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Firstly, we describe how rehydration reactions proceed based on theoretical considerations (Guiraud et al 2001;Putnis 2009;Putnis and Austrheim 2010) and natural observations of metamorphic rocks (Andersen et al 1991;Imon et al 2002;Okamoto and Toriumi 2005;Yang 2004;Centrella et al 2015). Secondly, forward modeling of rehydration is formulated by applying the thermodynamic forward modeling approach proposed by Kuwatani et al (2011).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Thermodynamic forward modeling of retrogressive hydration reactions induced by geofluid infiltration

Kuwatani

Toriumi

2017

Earth Planets Space

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We have developed a new methodology for forward analysis of retrogressive hydration (rehydration) reactions by an improved thermodynamic forward modeling technique based on a differential thermodynamic approach (Gibbs' method). Based on natural observations and theoretical considerations, the progress of a rehydration reaction is modeled by incorporating a change in the effective bulk composition on account of the breakdown of the nonequilibrated phase and the amount of water infiltration into the system. Forward analyses of rehydration reactions under greenschist-facies conditions show that (1) the reaction progress of rehydration is proportional to the external water supply, and (2) the mineral compositions of equilibrated minerals are mainly controlled by P-T conditions and are similar to those in the global equilibrium model. Calculated results are in accordance with natural observations of rehydration reactions in greenschist-facies rocks, which supports the validity of the proposed model. The proposed model can be used as a basic forward model for various inversion analyses and numerical simulations and thus to understand the distribution and behavior of geofluids.

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Section: Rehydration Reactionsmentioning

confidence: 99%

Section: Rehydration Reactionsmentioning

confidence: 99%

Section: Rehydration Reactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Thermodynamic forward modeling of retrogressive hydration reactions induced by geofluid infiltration

Kuwatani

Toriumi

2017

Earth Planets Space

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Feedback between fluid infiltration and rheology along a regional ductile-to-brittle shear zone: The East Tenda Shear Zone (Alpine Corsica)

et al. 2014

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The East Tenda Shear Zone (ETSZ) is the major Alpine tectonic boundary marking the overthrusting of the ocean-derived Schistes Lustrés nappe onto the Variscan crystalline basement of Corsica. New structural, mineralogical, and geochemical investigations along a transect ranging from the Variscan basement to the contact with the Schistes Lustrés are used to construct a rheological model for the ETSZ during its polyphase deformation history. The progressive transformation of the isotropic granitoid protolith into gneisses, shear zones, and, locally, phyllonites is described. The textural/mineralogical change suggests a concurrent increasing metasomatism associated with structurally controlled fluid flow. The effect of such textural/mineralogical evolution on the bulk rheology of the ETSZ is estimated. Rheological flow laws are obtained using an averaging procedure based on the integration of single-phase rheological behavior. The flow laws are used to infer strain rates and construct strength envelopes for each structural domain during progressive deformation, which highlight the relative rheological differences of the main textural components of the ETSZ and the variations in their brittle/ductile transition depths. Two competing processes are inferred. On the one hand, the combined effects of the feldspar-to-mica reaction and the development of a strong planar fabric induce weakening and strain localization along shear zones. On the other hand, fluid channeling along these shear zones enhances alkali feldspar neoblastesis, inducing strain hardening. Among the possible consequences of such feedback processes between strain localization and fluid-rock interaction are episodes of rheological transitions from ductile to brittle behavior during the polyphase tectonic evolution of the ETSZ.

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Pore Fluid Extraction by Reactive Solitary Waves in 3‐D

Omlin

Malvoisin

Podladchikov

2017

Geophysical Research Letters

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In the lower crust, viscous compaction is known to produce solitary porosity and fluid pressure waves. Metamorphic (de)volatilization reactions can also induce porosity changes in response to the propagating fluid pressure anomalies. Here we present results from high‐resolution simulations using Graphic Processing Unit parallel processing with a model that includes both viscous (de)compaction and reaction‐induced porosity changes. Reactive porosity waves propagate in a manner similar to viscous porosity waves, but through a different mechanism involving fluid release and trap in the solid by reaction. These waves self‐generate from red noise or an ellipsoidal porosity anomaly with the same characteristic size and abandon their source region to propagate at constant velocity. Two waves traveling at different velocities pass through each other in a soliton‐like fashion. Reactive porosity waves thus provide an additional mechanism for fluid extraction at shallow depths with implications for ore formation, diagenesis, metamorphic veins formation, and fluid extraction from subduction zones.

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Fluid‐Induced Processes: Metasomatism and Metamorphism

Cited by 108 publications

References 94 publications

Thermodynamic forward modeling of retrogressive hydration reactions induced by geofluid infiltration

Thermodynamic forward modeling of retrogressive hydration reactions induced by geofluid infiltration

Feedback between fluid infiltration and rheology along a regional ductile-to-brittle shear zone: The East Tenda Shear Zone (Alpine Corsica)

Pore Fluid Extraction by Reactive Solitary Waves in 3‐D

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