Timing and heat sources for the Barrovian metamorphism, Scotland

Viete, Daniel R.; Oliver, Graham; Fraser, Geoff; Forster, Marnie; Lister, Gordon

doi:10.1016/j.lithos.2013.06.009

Cited by 52 publications

(70 citation statements)

References 99 publications

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“…Harte & Hudson (1979) proposed an alternative model in which the sillimanite overprint developed within the same thermal context as the rest of the Barrovian metamorphic sequence; the sillimanite overprint represents the Barrovian thermal climax. Viete et al (2013) reconciled the Harte & Hudson (1979) view on the sillimanite overprint with the spatial association between sillimanite-grade rocks and the Grampian gabbros, suggesting that the entire Barrovian thermal anomaly, from the chlorite zone to the sillimanite zone, resulted from regional contact metamorphism driven by punctuated and focused magmatic heat advection.…”

Section: Self Affinity In Metamorphic Time Scales?mentioning

confidence: 78%

“…The punctuated heat advection model of Viete et al (2013) followed Viete et al (2011b), who showed that Mn diffusion is recorded at multiple, discrete length scales within single garnets from the Barrovian sillimanite zone. Viete et al (2011b) suggested that multimodal distribution of length scales of chemical diffusion in high-grade garnets mirrors the multimodal distribution of length scales of the Barrovian isograds, and records thermal activity on multiple time scales in the high-grade core of the Barrovian metamorphic series.…”

Section: Self Affinity In Metamorphic Time Scales?mentioning

confidence: 99%

“…Viete et al (2011b) suggested that multimodal distribution of length scales of chemical diffusion in high-grade garnets mirrors the multimodal distribution of length scales of the Barrovian isograds, and records thermal activity on multiple time scales in the high-grade core of the Barrovian metamorphic series. Viete et al (2011bViete et al ( , 2013 proposed that the sillimanite overprint was, in effect, a 'last gasp' pulse of an episodic advective heating regime that produced the entire Barrovian metamorphic series. Figure 5 illustrates a series of T-t paths that may develop in response to the episodic heating regime proposed for the Barrovian metamorphism by Viete et al (2011bViete et al ( , 2013.…”

Section: Self Affinity In Metamorphic Time Scales?mentioning

confidence: 99%

“…Viete et al (2011bViete et al ( , 2013 proposed that the sillimanite overprint was, in effect, a 'last gasp' pulse of an episodic advective heating regime that produced the entire Barrovian metamorphic series. Figure 5 illustrates a series of T-t paths that may develop in response to the episodic heating regime proposed for the Barrovian metamorphism by Viete et al (2011bViete et al ( , 2013. The conceptual curves of Figure 5 demonstrate decreasing self affinity with distance from the heat source.…”

Section: Self Affinity In Metamorphic Time Scales?mentioning

confidence: 99%

“…Camacho et al 2005;Dragovic et al 2012Dragovic et al , 2015, magmatic (e.g. Baxter et al 2002;Brouwer et al 2004;Reverdatto & Polyansky 2004;Viete et al 2013) or tectonic (e.g. Smye et al 2011;Ashley et al 2015) heat advection, to account for peak metamorphic T. Globally, exceptional heating scenarios are also necessary to explain P-T conditions of subduction-zone metamorphism at forearc depths corresponding to P < 2 -2.5 GPa (Penniston-Dorland et al 2015).…”

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confidence: 99%

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On the significance of short-duration regional metamorphism

Viete

Lister

2016

JGS

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Short-duration regional metamorphism is a recently observed and poorly understood phenomenon in metamorphic geology. In this review, it is defined as metamorphism on time scales that limit length scales (of the associated thermal anomaly) to significantly less than the thickness of the orogenic crust (<10 myr) or subducted oceanic lithosphere (<5 myr). Without appealing to exceptional heat sources, thermal models have been unable to account for peak metamorphic temperature during collisional orogenesis and subduction. This observation, combined with restricted time scales for regional metamorphism, suggests that metamorphic facies series can record atypical and transient thermal conditions (related to punctuated and localized heat advection and/or production), rather than normal, ambient conditions for the tectonic setting to which they are allied. Highprecision geochronology can resolve short-duration metamorphic estimates of 1 -10 myr. However, diffusion geospeedometry typically yields extremely short metamorphic durations (<1 myr); tools in metamorphic geology may have matured to the point that the discipline is beginning to recognize episodicity and criticality in deep processes. New, very high-precision petrochronology techniques offer great potential to probe the veracity of extremely short metamorphic durations being obtained from diffusion geospeedometry. Benchmarking of these new very high-precision petrochronology techniques must become a priority for metamorphic geology.Received 26 May 2016; revised 2 October 2016; accepted 27 October 2016Early interpretations of the geological record leant heavily on catastrophism. As geology matured as a science, uniformitarianism came to supersede catastrophism. Uniformitarianism offers a more sophisticated, logical framework for interpretation of the rock record within the context of current and observable processes. However, the grand success of the uniformitarian philosophy has also resulted in a propensity toward interpretation of deep (and thus unobservable) geological phenomena in terms of slowly evolving or steady-state processes. A notable example of this preference for gradualism in deep processes has been ideas for the origins of regional metamorphism and metamorphic facies series, and implications for the nature of tectonism. Barrow (1893Barrow ( , 1912 was the first to map regional metamorphism on the basis of diagnostic mineral assemblages. His Barrovian metamorphic sequence, exposed in NE Scotland, comprises a series of 'isograds' marking the first appearance of chlorite, biotite, garnet, staurolite, kyanite and sillimanite in pelitic lithologies, in the direction of increasing metamorphic grade. Regional metamorphism recorded by Barrovian-type isograds defines intermediate pressure/temperature (P/T ) conditions (575 -1250°C GPa Barrow (1893) originally proposed that his Barrovian metamorphism resulted from magmatic advection of heat from depth. Following development of the theory of plate tectonics, numerous models were proposed for the ori...

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Section: Self Affinity In Metamorphic Time Scales?mentioning

confidence: 78%

Section: Self Affinity In Metamorphic Time Scales?mentioning

confidence: 99%

Section: Self Affinity In Metamorphic Time Scales?mentioning

confidence: 99%

Section: Self Affinity In Metamorphic Time Scales?mentioning

confidence: 99%

mentioning

confidence: 99%

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On the significance of short-duration regional metamorphism

Viete

Lister

2016

JGS

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An assessment of the role of nonlinear reaction kinetics in parameterization of metamorphic fluid flow

Zhao

Skelton

2014

JGR Solid Earth

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Based on inverse modeling of reaction progress data using a numerical framework that considers coupled advection and diffusion, linear and nonlinear reaction kinetics, and with effective diffusivity given by Archie's law, we show that (1) choice of reaction order has little effect (<0.3 orders of magnitude) on estimates of time-integrated and time-averaged metamorphic fluid fluxes and metamorphic fluid flow durations based on reaction progress data, (2) reaction order must be known for robust determination of time-averaged net reaction rates based on reaction progress data and that underestimation of this term by more than 3 orders of magnitude can arise from assuming linear reaction kinetics, (3) differing reaction orders between laboratory experiments and natural metamorphic systems and/or a nonlinear dependence of effective diffusivity on porosity can explain order-of-magnitude discrepancies between field-based and laboratory-based estimates of time-averaged net reaction rates, and (4) parameterization of metamorphic fluid flow is limited to time-averaged values which fail to account for the possibility that metamorphism occurs in short-lived pulses during longer time periods of metamorphic quiescence.

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HT–MP metamorphism in Central Qilian Block, NE Tibet Plateau: Implications on the tectonic evolution of the Qilian Orogen

et al. 2022

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The metamorphism of the Central Qilian Block in the northeastern Tibetan Plateau records a complete tectonic history of the Qilian Orogen. Here, results of structural measurements, geochronological data, and thermobarometry for metamorphic rocks in the Central Qilian Block were presented, which trace the tectonic evolution of the Qilian Orogen. New U-Pb dating of detrital zircon from one paragneiss shows a main age population between c. 1500 and c. 1250 Ma, with the youngest age of 1085 Ma. This unit was intruded by an orthogneiss which has a U-Pb weighted mean age of 920 ± 18 Ma. Together with c. 1200-1000 Ma ages from inherited zircon cores in amphibolites, these results indicate that the protoliths of the Huangyuan Group were formed during the Mesoproterozoic and Neoproterozoic. Rims of these zircons obtain tightly constrained and concordant ages ranging from c. 459 to c. 427 Ma, with a weighted mean age of c. 450 Ma. Phase equilibrium modelling and conventional thermobarometry jointly indicate high-temperature/medium-pressure HT-MP metamorphism along a clockwise pressure-temperature (P-T) path at c. 450 Ma, passing through prograde conditions of 7.8-8.0 kbar and 620-650 C to peak conditions of 7 kbar and 780-800 C. Together with documented widespread metamorphism, magmatism, and ductile shear belts, these new results reassert that the Central Qilian Block experienced a three-stage tectono-metamorphic evolution during the Early Palaeozoic and the HT-MP metamorphism of Huangyuan Group was developed by a continental collision geodynamic setting with coeval mafic and granitic magmatism.

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Timing and heat sources for the Barrovian metamorphism, Scotland

Cited by 52 publications

References 99 publications

On the significance of short-duration regional metamorphism

On the significance of short-duration regional metamorphism

An assessment of the role of nonlinear reaction kinetics in parameterization of metamorphic fluid flow

HT–MP metamorphism in Central Qilian Block, NE Tibet Plateau: Implications on the tectonic evolution of the Qilian Orogen

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