Articles | Volume 13, issue 11
Research article
22 Nov 2022
Research article |  | 22 Nov 2022

Epidote dissolution–precipitation during viscous granular flow: a micro-chemical and isotope study

Veronica Peverelli, Alfons Berger, Martin Wille, Thomas Pettke, Pierre Lanari, Igor Maria Villa, and Marco Herwegh

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Cited articles

Anenburg, M., Katzir, Y., Rhede, D., Jöns, N., and Bach, W.: Rare earth element evolution and migration in plagiogranites: a record preserved in epidote and allanite of the Troodos ophiolite, Contrib. Mineral. Petrol., 169, 25,, 2015. 
Bambauer, H. U., Herwegh, M., and Kroll, H.: Quartz as indicator mineral in the Central Swiss Alps: The quartz recrystallization isograd in the rock series of the northern Aar massif, Swiss J. Geosci., 102, 345–351,, 2009. 
Bate, P.: The effect of deformation on grain growth in Zener pinned systems, Acta Mater., 49, 1453–1461,, 2001. 
Belgrano, T. M., Herwegh, M., and Berger, A.: Inherited structural controls on fault geometry, architecture and hydrothermal activity: an example from Grimsel Pass, Switzerland, Swiss J. Geosci., 109, 345–364,, 2016. 
Bergemann, C., Gnos, E., Berger, A., Whitehouse, M., Mullis, J., Wehrens, P., Pettke, T., and Janots, E.: Th-Pb ion probe dating of zoned hydrothermal monazite and its implications for repeated shear zone activity: An example from the central alps, Switzerland, Tectonics, 36, 671–689,, 2017. 
Short summary
This work studies the interplay of epidote dissolution–precipitation and quartz dynamic recrystallization during viscous granular flow in a deforming epidote–quartz vein. Pb and Sr isotope data indicate that epidote dissolution–precipitation is mediated by internal/recycled fluids with an additional external fluid component. Microstructures and geochemical data show that the epidote material is redistributed and chemically homogenized within the deforming vein via a dynamic granular fluid pump.