Contact metamorphism of layered carbonate-shale sequences in the Oslo Rift. II: Migration of isotopic and reaction fronts around cooling plutons

Jamtveit, Bjørn; Grorud, Hans Fredrik; Bucher-Nurminen, Kurt

doi:10.1016/0012-821x(92)90156-p

Cited by 40 publications

(14 citation statements)

References 32 publications

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“…Simoneit et al 1978;Jamtveit et al 1992;Lasaga & Rye 1993;Bishop & Abbott 1995;Cooper et al 2007;Nabelek 2007;Aarnes et al 2010). Simoneit et al 1978;Jamtveit et al 1992;Lasaga & Rye 1993;Bishop & Abbott 1995;Cooper et al 2007;Nabelek 2007;Aarnes et al 2010).…”

Section: Introductionunclassified

Devolatilization‐induced pressure build‐up: Implications for reaction front movement and breccia pipe formation

Aarnes¹,

Podladchikov²,

Svensen³

2012

Geofluids

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Generation of fluids during metamorphism can significantly influence the fluid overpressure, and thus the fluid flow in metamorphic terrains. There is currently a large focus on developing numerical reactive transport models, and with it follows the need for analytical solutions to ensure correct numerical implementation. In this study, we derive both analytical and numerical solutions to reaction‐induced fluid overpressure, coupled to temperature and fluid flow out of the reacting front. All equations are derived from basic principles of conservation of mass, energy and momentum. We focus on contact metamorphism, where devolatilization reactions are particularly important owing to high thermal fluxes allowing large volumes of fluids to be rapidly generated. The analytical solutions reveal three key factors involved in the pressure build‐up: (i) The efficiency of the devolatilizing reaction front (pressure build‐up) relative to fluid flow (pressure relaxation), (ii) the reaction temperature relative to the available heat in the system and (iii) the feedback of overpressure on the reaction temperature as a function of the Clapeyron slope. Finally, we apply the model to two geological case scenarios. In the first case, we investigate the influence of fluid overpressure on the movement of the reaction front and show that it can slow down significantly and may even be terminated owing to increased effective reaction temperature. In the second case, the model is applied to constrain the conditions for fracturing and inferred breccia pipe formation in organic‐rich shales owing to methane generation in the contact aureole.

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Section: Introductionunclassified

Devolatilization‐induced pressure build‐up: Implications for reaction front movement and breccia pipe formation

Aarnes¹,

Podladchikov²,

Svensen³

2012

Geofluids

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“…and Bucher-Nurminen, 1992). Decarbonation reactions leading to formation of the contact metamorphic mineral assemblage are to a large extent driven by this infiltration.…”

Section: Contact Metamorphism In the Rift 63mentioning

confidence: 97%

“…4.4c). Within this limestone unit, the carbonate layers are zoned with respect to oxygen isotope composition, with the lowest (most altered) values near thin calc-silicate (former shale) layers Oamtveit, Grorud and Bucher-Nurminen, 1992). Based on these data and a 10 advection transport model, Jamtveit, Grorud and Bucher-Nurminen (1992) estimated the fluid fluxes away from the intrusive contact ( ~ 2000 m 3 m -2, depending on the vertical slope of the intrusive contact), the eo l content of the magmatic fluids (X C02 c. 0.005) and the fluid flow rates « 10 -8 m s -1).…”

Section: The Drammen Granitementioning

confidence: 99%

Fluid Flow and Transport in Rocks

Jamtveit¹,

Yardley²

1996

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“…Early infiltration was pervasive and coeval with more or less ductile deformation. whereas later infiltration was focused along faults and fractures formed during brittle deformation (1,(2)(3)(4). Garnets grew throughout these events.…”

Section: Mil) Across the Interface Between Aluminum-rich Garnet Coresmentioning

confidence: 99%

“…NY 10025. Atlantic because experiments with acoupled ocean-atmosphere model suggest that the North Atlantic thermohaline circulation, which delivers heat to the high latitudes, could alternate between two stable modes of operation (on or off), and asoects of North Atlantic deeo-sea sediment records exhibit this type of behavior(4). However.…”

mentioning

confidence: 99%

Constraints on Transport and Kinetics in Hydrothermal Systems from Zoned Garnet Crystals

Jamtveit

Hervig

1994

Science

117

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Zonation of oxygen isotope ratios, fluorine, and rare earth element abundances across garnet crystals from the Permian Oslo Rift reflect temporal variation of the hydrothermal system in which the garnets grew. A sharp rimward decrease in the (18)O/(16)O ratio (of 5 per mil) across the interface between aluminum-rich garnet cores and iron-rich rims indicates influx of meteoric fluids to a system initially dominated by magmatic fluids. This influx may record the transition from ductile to brittle deformation of the hydrothermally altered rocks. In contrast, fluorine and light rare earth element concentrations increase at the core-rim interface. These data may reflect enhanced advective transport and notable kinetic control on trace element uptake by the garnets during brittle deformation.

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Contact metamorphism of layered carbonate-shale sequences in the Oslo Rift. II: Migration of isotopic and reaction fronts around cooling plutons

Cited by 40 publications

References 32 publications

Devolatilization‐induced pressure build‐up: Implications for reaction front movement and breccia pipe formation

Devolatilization‐induced pressure build‐up: Implications for reaction front movement and breccia pipe formation

Fluid Flow and Transport in Rocks

Constraints on Transport and Kinetics in Hydrothermal Systems from Zoned Garnet Crystals

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