Articles | Volume 13, issue 11
https://doi.org/10.5194/se-13-1803-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-13-1803-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
22 Nov 2022
Research article |
| 22 Nov 2022
| 22 Nov 2022
Epidote dissolution–precipitation during viscous granular flow: a micro-chemical and isotope study
Veronica Peverelli
CORRESPONDING AUTHOR
Department of Geological Sciences, University of Bern, 3012 Bern,
Switzerland
Alfons Berger
Department of Geological Sciences, University of Bern, 3012 Bern,
Switzerland
Martin Wille
Department of Geological Sciences, University of Bern, 3012 Bern,
Switzerland
Thomas Pettke
Department of Geological Sciences, University of Bern, 3012 Bern,
Switzerland
Pierre Lanari
Department of Geological Sciences, University of Bern, 3012 Bern,
Switzerland
Igor Maria Villa
Department of Geological Sciences, University of Bern, 3012 Bern,
Switzerland
Dipartimento di Scienze dell'Ambiente e della Terra, University of
Milano-Bicocca, 20126 Milan, Italy
Marco Herwegh
Department of Geological Sciences, University of Bern, 3012 Bern,
Switzerland
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We used U–Pb dating and Pb–Sr–O–H isotopes of hydrothermal epidote to characterize fluid circulation in the Aar Massif (central Swiss Alps). Our data support the hypothesis that Permian fluids exploited syn-rift extensional faults. In the Miocene during the Alpine orogeny, fluid sources were meteoric, sedimentary, and/or metamorphic water. Likely, Miocene shear zones were exploited for fluid circulation, with implications for the Sr isotope budget of the granitoids.
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Revised manuscript not accepted
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Francesco Giuntoli, Pierre Lanari, and Martin Engi
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Francesco Giuntoli, Pierre Lanari, Marco Burn, Barbara Eva Kunz, and Martin Engi
Solid Earth, 9, 191–222, https://doi.org/10.5194/se-9-191-2018, https://doi.org/10.5194/se-9-191-2018, 2018
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Subducted continental terranes commonly comprise an assembly of subunits that reflect the different tectono-metamorphic histories they experienced in the subduction zone. Our challenge is to unravel how, when, and in which part of the subduction zone these subunits were juxtaposed. Our study documents when and in what conditions re-equilibration took place. Results constrain the main stages of mineral growth and deformation, associated with fluid influx that occurred in the subduction channel.
Raphael Schneeberger, Miguel de La Varga, Daniel Egli, Alfons Berger, Florian Kober, Florian Wellmann, and Marco Herwegh
Solid Earth, 8, 987–1002, https://doi.org/10.5194/se-8-987-2017, https://doi.org/10.5194/se-8-987-2017, 2017
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Structural 3-D modelling has become a widely used technique within applied projects. We performed a typical modelling workflow for a study site with the occurrence of an underground facility. This exceptional setting enabled us to test the surface-based extrapolation of faults with the mapped faults underground. We estimated the extrapolation-related uncertainty with probabilistic 2-D interpolation. This research was conducted to improve structural 3-D modelling in less-constrained areas.
Related subject area
Subject area: Tectonic plate interactions, magma genesis, and lithosphere deformation at all scales | Editorial team: Geochemistry, mineralogy, petrology, and volcanology | Discipline: Geochemistry
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In the Liaodong Peninsula, the widely exposed Jurassic high-Sr / Y rocks are generally considered to be derived from the thickened mafic crust. However, research on the Zhoujiapuzi granite in this study shows that there is at least one pluton with a high Sr / Y signature inherited from the source. Zircon growth in Zhoujiapuzi granite can be divided into two stages. The light-CL core was formed in a deeper, hotter magma chamber. The dark-CL rim formed from later, more evolved magma.
J. Javier Álvaro, Teresa Sánchez-García, Claudia Puddu, Josep Maria Casas, Alejandro Díez-Montes, Montserrat Liesa, and Giacomo Oggiano
Solid Earth, 11, 2377–2409, https://doi.org/10.5194/se-11-2377-2020, https://doi.org/10.5194/se-11-2377-2020, 2020
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A geochemical comparison of early Palaeozoic felsic magmatic episodes throughout the south-western European margin of Gondwana is analysed and includes data from the Iberian Massif, the Eastern Pyrenees, southern France and Sardinia. This dataset favours partial melting of sediments and/or granitoids in the lower continental crust during extensional movements related to the opening of the Rheic Ocean.
Marion Louvel, Carmen Sanchez-Valle, Wim J. Malfait, Gleb S. Pokrovski, Camelia N. Borca, and Daniel Grolimund
Solid Earth, 11, 1145–1161, https://doi.org/10.5194/se-11-1145-2020, https://doi.org/10.5194/se-11-1145-2020, 2020
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Here, we conducted spectroscopic measurements on high-pressure, high-temperature fluids and melts to study how halogens, in particular bromine, can be incorporated in subduction zone fluids and melts. We find that a gradual evolution of bromine speciation with liquid composition enables the incorporation of high amounts of Br in both phases. Thus, bromine and, by extension, chlorine are expected to be efficiently recycled from the slab towards the volcanic arc.
Americus Perez, Susumu Umino, Graciano P. Yumul Jr., and Osamu Ishizuka
Solid Earth, 9, 713–733, https://doi.org/10.5194/se-9-713-2018, https://doi.org/10.5194/se-9-713-2018, 2018
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The occurrence of boninite in the northern Zambales ophiolite is reported. Boninite is a relatively rare high-magnesium andesite that is intimately associated with early arc volcanism and the initiation of subduction zones. Taken as a whole, the geological and geochemical characteristics of Zambales and Izu-Ogasawara–Mariana forearc volcanic sequences enables a refined geodynamic reconstruction of subduction initiation.
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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.
This work studies the interplay of epidote dissolution–precipitation and quartz dynamic...
