Calcium diffusivity in alumino-silicate garnets: an experimental and ATEM study

Vielzeuf, Daniel; Baronnet, Alain; Perchuk, A. L.; Laporte, Didier; Baker, M. B.

doi:10.1007/s00410-007-0184-x

Cited by 79 publications

(67 citation statements)

References 44 publications

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“…Consequently, diffusion coefficients D Fe-Mg retrieved using the two kinds of models do not differ from experimentally reported data for most natural garnet compositions. Diffusivities retrieved by Freer and Edwards (1999) are higher than for other experimental data Borinski et al 2012;Vielzeuf et al 2007) (Fig. 4).…”

Section: Trivalent Rare Earth Element Diffusionmentioning

confidence: 50%

“…1). Mg self-diffusion coefficients were also experimentally determined by Schwandt et al (1995) for natural pyrope-almandine garnet in a 1 atm CO-CO 2 gas-mixing furnace at 1073-1273 K, and determined by Chakraborty and Rubie (1996) , MLFR13 (van Mierlo et al 2013), NKO13 , VBP07 (Vielzeuf et al 2007), BHC12 , FE99 (Freer and Edwards 1999) Chakraborty and Rubie (1996) and Cygan and Lasaga (1985) at 0.1 GPa and 1023-1173 K (Fig. 1), but higher by more than one order of magnitude than that obtained by Schwandt et al (1995).…”

Section: Oxygen Diffusionmentioning

confidence: 99%

“…They found a very high value (11.2 cm 3 /mol) for the activation volume, for which they could not offer a plausible explanation. Vielzeuf et al (2007) determined quasibinary Ca-(Fe,Mg) interdiffusion coefficients in garnet-as if Fe and Mg constitute a single component-from the results of diffusion couple experiments in a piston-cylinder apparatus at 1.5-3.2 GPa, 1173-1373 K, fO 2 : IW buffer and 1.3 GPa, 1323-1523 K, fO 2 : B graphite-O 2 buffer, respectively. The interdiffusion coefficients of Ca-(Fe,Mg) in garnet reported by Vielzeuf et al (2007) are much lower than those obtained by Freer and Edwards (1999) (Fig.…”

Section: Trivalent Rare Earth Element Diffusionmentioning

confidence: 99%

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Diffusion in garnet: a review

Zhang

2017

Acta Geochim

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With improvements on high-pressure experimental techniques in multi-anvil apparatus and the development of new analytical tools, major progress has been made on diffusion in garnets in the past several decades. The data obtained in the experimental determination of diffusion coefficients in garnets are of fundamental importance for diffusion modeling and timescales of geological and planetary processes. In this review, we have compiled experimental data on self-diffusion (Si, O, cations), trace element diffusion (Li, Y, Ga, Cr, Sr, REEs), and interdiffusion (CaFe/Mg, Si-Al) in garnet in the light of new advances and recent applications. In addition, some empirical relationships among diffusion parameters (pre-exponential factor D 0 , activation energy E, ionic radius) are also discussed. We hope that this review can provide a useful data digest and guide to future study of diffusion in garnet.

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Section: Trivalent Rare Earth Element Diffusionmentioning

confidence: 50%

Section: Oxygen Diffusionmentioning

confidence: 99%

Section: Trivalent Rare Earth Element Diffusionmentioning

confidence: 99%

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Diffusion in garnet: a review

Zhang

2017

Acta Geochim

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“…Spear (1991) showed that, depending on diameter, cooling rate, and ratio of garnet to biotite, diffusion can impact garnet rim compositions to temperatures as low as 550 °C. As the diffusion of Ca in garnet is orders of magnitude slower than Fe and Mg (Vielzeuf et al, 2007), and reaction rates are considerably slower below the solidus , the intersection of the grossular isopleths with the solidus (point C) is taken as the P-T conditions at which the rim last equilibrated. The interpreted prograde P-T path is a heating path with minor burial in the kyanite field (Figs.…”

Section: Ka044mentioning

confidence: 99%

Lateral extrusion, underplating, and out-of-sequence thrusting within the Himalayan metamorphic core, Kanchenjunga, Nepal

et al. 2015

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Integrated pseudosection modeling and monazite petrochronology of paragneiss from the Kanchenjunga region of northeastern Nepal reveal the presence of cryptic tectonometamorphic discontinuities within the Himalayan metamorphic core. These new data outline a series of thrust-sense structures that juxtapose rocks that generally record a protracted history of early Eocene to latest Oligocene-early Miocene (ca. 41-23 Ma) prograde metamorphism and lateral extrusion against others that typically record short prograde (between 2 and 7 m.y.) and retrograde (between 3 and 6 m.y.) histories variably spanning the middle Oligocene to the middle Miocene (ca. 31-12 Ma). Retrograde metamorphism in the hanging wall of the thrust faults is typically coeval with prograde metamorphism in the footwall, indicating that overthrusting/underthrusting accommodated crustal shortening and drove metamorphic processes. The structures and juxtaposed panels were cut by early Miocene (ca. 20-18 Ma) out-of-sequence thrusting coincident with the previously mapped High Himal thrust. The resulting kinematic model for the evolution of the Himalayan metamorphic core in the Kanchenjunga area demonstrates that the Himalayan metamorphic core was dominated by underplating from at least the Oligocene through to present, and that the internal structure of the exhumed metamorphic core is significantly more complex than has been documented previously.

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“…Efforts to quantify the variables that describe major element diffusion in garnet have principally involved experimental studies on garnets of varying composition (e.g. Freer 1979;Cygan & Lasaga 1985;Loomis et al 1985;Chakraborty & Ganguly 1992;Schwandt et al 1995Schwandt et al , 1996Ganguly et al 1998;Freer & Edwards 1999;Vielzeuf et al 2007). Experimental work concerning the diffusion of commonly occurring divalent cationic species (Ca, Fe, Mg, Mn) in garnet has been carried out at pressures of between 1 bar and 40 kbar and temperatures of 800-1400 8C.…”

Section: Major Element Diffusion In Garnetmentioning

confidence: 99%

The nature and origin of the Barrovian metamorphism, Scotland: diffusion length scales in garnet and inferred thermal time scales

Viete

Hermann

Lister

et al. 2011

JGS

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In this paper we examine the length scales of major element diffusion in garnet during the Barrovian metamorphism. The role of diffusion in the flattening of Mn zoning profiles in garnet with increasing metamorphic grade across the Barrovian metamorphic series is ambiguous. However, the loss of distinct Mn-defined secondary compositional zoning in Barrovian garnets with increasing metamorphic grade and preservation of geochemical textures around Mn-free inclusions within high-grade Barrovian garnets provide robust evidence for c. 1000 ìm Mn diffusion in sillimanite-zone garnets during the Barrovian regional metamorphism. Sillimanite-grade garnets from the Barrovian metamorphic series also preserve c. 100 ìm Mn diffusion textures between sillimanite-grade rim domains and lower-grade cores. Bimodality in diffusion length scales requires bimodality in thermal time scales. Length scales of chemical diffusion are considered within the context of recent duration estimates for the Barrovian metamorphism of a few million years. We conclude that heat associated with the Barrovian regional metamorphism accumulated following numerous, short time-scale heating events responsible for the smaller-scale diffusion textures. This self-similar thermal regime was likely accommodated by the operation of shear zones in the highest-grade regions of the Barrovian metamorphic series, which concentrated small-scale episodic heat sources such as sheeted magmas, fluids and/ or mechanical work.Supplementary material: A table of quantitative electron microprobe analyses, an example of the calibration curve used to produce quantitative electron microprobe maps from count maps, and Y maps are available at

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Calcium diffusivity in alumino-silicate garnets: an experimental and ATEM study

Cited by 79 publications

References 44 publications

Diffusion in garnet: a review

Diffusion in garnet: a review

Lateral extrusion, underplating, and out-of-sequence thrusting within the Himalayan metamorphic core, Kanchenjunga, Nepal

The nature and origin of the Barrovian metamorphism, Scotland: diffusion length scales in garnet and inferred thermal time scales

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