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Journal articles on the topic 'Zermatt-Saas Zone'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

REBAY, GISELLA, DAVIDE ZANONI, ANTONIO LANGONE, PIETRO LUONI, MASSIMO TIEPOLO, and MARIA IOLE SPALLA. "Dating of ultramafic rocks from the Western Alps ophiolites discloses Late Cretaceous subduction ages in the Zermatt-Saas Zone." Geological Magazine 155, no. 2 (2017): 298–315. http://dx.doi.org/10.1017/s0016756817000334.

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AbstractThe Zermatt-Saas Zone was part of the Middle to Late Jurassic Tethyan lithosphere that underwent oceanic metamorphism during Mesozoic time and subduction during Eocene time (HP to UHP metamorphism). In upper Valtournanche, serpentinite, metarodingite and eclogite record a dominant S2 foliation that developed under 2.5±0.3 GPa and 600±20°C during Alpine subduction. Serpentinites contain clinopyroxene and rare zircon porphyroclasts. Clinopyroxene porphyroclasts show fringes within S2 with similar compositions to that of grains defining S2. Zircon cores show zoning typical of magmatic gro

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2

BARNICOAT, A. C., and N. FRY. "High-pressure metamorphism of the Zermatt-Saas ophiolite zone, Switzerland." Journal of the Geological Society 143, no. 4 (1986): 607–18. http://dx.doi.org/10.1144/gsjgs.143.4.0607.

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3

Barnicoat, A. C. "Zoned high-pressure assemblages in pillow lavas of the Zermatt-Saas ophiolite zone, Switzerland." Lithos 21, no. 3 (1988): 227–36. http://dx.doi.org/10.1016/0024-4937(88)90011-4.

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4

Reinecke, Thomas. "Very-high-pressure metamorphism and uplift of coesite-bearing metasediments from the Zermatt-Saas zone, Western Alps." European Journal of Mineralogy 3, no. 1 (1991): 7–18. http://dx.doi.org/10.1127/ejm/3/1/0007.

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5

Widmer, T. "Local origin of high pressure vein material in eclogite facies rocks of the Zermatt-Saas-Zone, Switzerland." American Journal of Science 301, no. 7 (2001): 627–56. http://dx.doi.org/10.2475/ajs.301.7.627.

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6

McNamara, D. D., J. Wheeler, M. Pearce, and D. J. Prior. "Fabrics produced mimetically during static metamorphism in retrogressed eclogites from the Zermatt-Saas zone, Western Italian Alps." Journal of Structural Geology 44 (November 2012): 167–78. http://dx.doi.org/10.1016/j.jsg.2012.08.006.

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7

Gilio, Mattia, Marco Scambelluri, Samuele Agostini, Marguerite Godard, Daniel Peters, and Thomas Pettke. "Petrology and Geochemistry of Serpentinites Associated with the Ultra-High Pressure Lago di Cignana Unit (Italian Western Alps)." Journal of Petrology 60, no. 6 (2019): 1229–62. http://dx.doi.org/10.1093/petrology/egz030.

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AbstractIn the Western Alps, the ophiolitic Zermatt–Saas Zone (ZSZ) and the Lago di Cignana Unit (LCU) record oceanic lithosphere subduction to high (540°C, 2·3GPa) and ultra-high pressure (600°C, 3·2GPa), respectively. The top of the Zermatt–Saas Zone in contact with the Lago di Cignana Unit consists of olivine + Ti-clinohumite-bearing serpentinites (the Cignana serpentinite) hosting olivine + Ti-clinohumite veins and dykelets of olivine + Ti-chondrodite + Ti-clinohumite. The composition of this serpentinite reveals a refertilized oceanic mantle peridotite protolith that became subsequently e

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8

Bucher, K., and R. Grapes. "The Eclogite-facies Allalin Gabbro of the Zermatt-Saas Ophiolite, Western Alps: a Record of Subduction Zone Hydration." Journal of Petrology 50, no. 8 (2009): 1405–42. http://dx.doi.org/10.1093/petrology/egp035.

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9

Reinecke, T. "Prograde high- to ultrahigh-pressure metamorphism and exhumation of oceanic sediments at Lago di Cignana, Zermatt-Saas Zone, western Alps." Lithos 42, no. 3-4 (1998): 147–89. http://dx.doi.org/10.1016/s0024-4937(97)00041-8.

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10

Pleuger, Jan, Sybille Roller, Jens M. Walter, Ekkehard Jansen, and Nikolaus Froitzheim. "Structural evolution of the contact between two Penninic nappes (Zermatt-Saas zone and Combin zone, Western Alps) and implications for the exhumation mechanism and palaeogeography." International Journal of Earth Sciences 96, no. 2 (2006): 229–52. http://dx.doi.org/10.1007/s00531-006-0106-6.

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11

Pleuger, Jan, Sybille Roller, Jens M. Walter, Ekkehard Jansen, and Nikolaus Froitzheim. "Structural evolution of the contact between two Penninic nappes (Zermatt-Saas zone and Combin zone, Western Alps) and implications for the exhumation mechanism and palaeogeography." International Journal of Earth Sciences 96, no. 6 (2007): 1211–12. http://dx.doi.org/10.1007/s00531-007-0197-8.

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12

Santillán-Quiroga, Luis Miguel, Daniele Cocca, Manuela Lasagna, et al. "Analysis of the Recharge Area of the Perrot Spring (Aosta Valley) Using a Hydrochemical and Isotopic Approach." Water 15, no. 21 (2023): 3756. http://dx.doi.org/10.3390/w15213756.

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The Perrot Spring (1300 m a.s.l.), located to the right of the Chalamy valley in the Monte Avic Natural Park (Valle d’Aosta, Italy), is an important source of drinking water for the municipality of Champdepraz. This spring is located on a large slope characterised by the presence of a Quaternary cover of various origins (glacial, glaciolacustrine, and landslide) above the bedrock (essentially serpentinite referred to the Zermatt–Saas Zone, Penninic Domain). Water emerges at the contact between the landslide bodies and impermeable or semi-permeable glaciolacustrine deposits. The aim of this stu

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13

Weber, Sebastian, Sascha Sandmann, Irena Miladinova, et al. "Dating the initiation of Piemonte-Liguria Ocean subduction: Lu–Hf garnet chronometry of eclogites from the Theodul Glacier Unit (Zermatt-Saas zone, Switzerland)." Swiss Journal of Geosciences 108, no. 2-3 (2015): 183–99. http://dx.doi.org/10.1007/s00015-015-0180-5.

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14

Angiboust, S., P. Agard, L. Jolivet, and O. Beyssac. "The Zermatt-Saas ophiolite: the largest (60-km wide) and deepest (c.70-80 km) continuous slice of oceanic lithosphere detached from a subduction zone?" Terra Nova 21, no. 3 (2009): 171–80. http://dx.doi.org/10.1111/j.1365-3121.2009.00870.x.

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15

Lecacheur, Kilian, Olivier Fabbri, Francesca Piccoli, Pierre Lanari, Philippe Goncalves, and Henri Leclère. "High-pressure Ca metasomatism of metabasites (Mont Avic, Western Alps): insights into fluid–rock interaction during subduction." European Journal of Mineralogy 36, no. 5 (2024): 767–95. http://dx.doi.org/10.5194/ejm-36-767-2024.

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Abstract. The study of rock chemistry is a milestone in understanding fluid–rock interactions and fluid migration in subduction zones. When combined with thermodynamic models, it can provide direct insight into fluid composition, metasomatic reactions, and pressure–temperature (P–T) conditions, as well as their role in rock deformation. Here, a shear zone – located in the Mont Avic area of the Zermatt-Saas zone (Western Alps) – is analyzed. This shear zone consists of several blocks of different lithotypes, including a Ca-rich metasomatite block embedded in a serpentinite mylonitic matrix, and

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16

Cartwright, I., and A. C. Barnicoat. "Petrology, geochronology, and tectonics of shear zones in the Zermatt-Saas and Combin zones of the Western Alps." Journal of Metamorphic Geology 20, no. 2 (2002): 263–81. http://dx.doi.org/10.1046/j.0263-4929.2001.00366.x.

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17

Stoffel, M. "Impacts of climate change on natural hazards and land use in the Saas and Zermatt Valleys (Switzerland)." Geographica Helvetica 54, no. 4 (1999): 224–28. http://dx.doi.org/10.5194/gh-54-224-1999.

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Abstract. The aim of Swiss land use planning is to guarantee an expedient and economical use ofthe land and an orderly development of the country. Therefore. land use planning has to designate areas suitable for optimal economic development. The possiblility of climate change poses a special challenge for land use planners. This paper examines the implications of environmental change resulting from climate change and anticipates new zones of conflict between existing and future land uses in the Saas and Zermatt Valleys (Valais. Switzerland). Differences between the «reul-time» decisions of pla

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18

Kirst, Frederik, and Bernd Leiss. "Kinematics of syn- and post-exhumational shear zones at Lago di Cignana (Western Alps, Italy): constraints on the exhumation of Zermatt–Saas (ultra)high-pressure rocks and deformation along the Combin Fault and Dent Blanche Basal Thrust." International Journal of Earth Sciences 106, no. 1 (2016): 215–36. http://dx.doi.org/10.1007/s00531-016-1316-1.

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19

Guerini, S., and P. Tartarotti. "The effect of tectonic boudinage and folding in a subducted mélange of the Alpine orogenic belt (Zermatt-Saas Zone, Italian Western Alps)." Journal of the Geological Society, November 16, 2023. http://dx.doi.org/10.1144/jgs2023-142.

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The Zermatt-Saas Zone is an eclogite-facies metaophiolite unit representing the fossil oceanic lithosphere of the Jurassic Tethys. In the Italian Northwestern Alps, the Zermatt-Saas Zone includes a chaotic rock unit, or mélange, ca. 40 m thick, interposed between serpentinites and calcschists. The mélange consists of decimetric ultramafic layers and boudins embedded in a serpentine + carbonate-rich matrix showing a block-in-matrix fabric. The mélange shares the same Alpine tectono-metamorphic evolution with the surrounding rocks, starting with a prograde path developed under high-pressure (HP)

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20

Piccoli, Francesca, Aaron A. Hutter, and Jörg Hermann. "Carbon retention during subduction of ophicarbonate rocks from the Zermatt-Saas unit (Western Alps)." Swiss Journal of Geosciences 118, no. 1 (2025). https://doi.org/10.1186/s00015-025-00479-6.

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Abstract Serpentinite-hosted carbonate rocks (i.e., ophicarbonates) are an important rock type for the deep C cycle because they can occur either in the slab or in the mantle wedge. We present a case study of ophicarbonate rocks from the Zermatt-Saas unit, Western Alps, that were subducted up to eclogite facies conditions at 2.5 GPa, 560 °C. In the study area, ophicarbonates overlie a large body of partially dehydrated serpentinites. This allows us to understand whether fluids released from the serpentinites infiltrated the ophicarbonates or not, and to what extent decarbonation reactions occu

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21

Bucher, Kurt, and Ingrid Stober. "Metamorphic gabbro and basalt in ophiolitic and continental nappes of the Zermatt region (Western Alps)." Swiss Journal of Geosciences 114, no. 1 (2021). http://dx.doi.org/10.1186/s00015-021-00390-w.

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AbstractThe composition of meta-gabbro and meta-basalt occurring abundant and widespread in all nappes of the nappe stack exposed in the Zermatt region of the Western Alp shows distinct patterns related to the geodynamic origin of metamorphic basic rocks. Eclogitic meta-basalts of the ophiolitic Zermatt-Saas Unit (ZSU) show enriched MORB signatures. The meta-basalts (eclogites) of the continental fragment of the Theodul Glacier Unit (TGU) derive from pre-Alpine metamorphic continental intraplate basalts. Meta-basalts (eclogites) from the continental basement of the Siviez-Mischabel nappe (SMN)

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22

Zanoni, Davide, Gisella Rebay, Jacopo Bernardoni, and Maria Iole Spalla. "Using multiscale structural analysis to infer high-/ultrahigh-pressure assemblages in subducted rodingites of the Zermatt-Saas Zone at Valtournanche, Italy." Journal of the Virtual Explorer 41 (2012). http://dx.doi.org/10.3809/jvirtex.2011.00290.

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23

Gusmeo, Thomas, Gisella Rebay, Maria Iole Spalla, and Davide Zanoni. "Origin and tectono-metamorphic history of the Riffelberg-Garten meta-sedimentary ophiolitic unit, Western Alps." Journal of the Geological Society, March 26, 2025. https://doi.org/10.1144/jgs2025-041.

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Within the Zermatt-Saas Zone (Western Alps), the Riffelberg-Garten Unit is part of the ophiolite meta-sedimentary cover, which in uppermost Valtournanche contains metabasite (some with gabbro texture) and minor ultramafite elements. Seven Riffelberg-Garten Unit types are distinguished based on rock matrix composition and amount, shape, composition, and size of enclosed elements. The rock matrix varies between carbonate-rich and quartz-rich, with white mica in most types. These rocks record four groups of Alpine syn-metamorphic ductile structures. The first two, developed during oceanic subduct

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24

Bovay, Thomas, Daniela Rubatto, and Pierre Lanari. "Pervasive fluid-rock interaction in subducted oceanic crust revealed by oxygen isotope zoning in garnet." Contributions to Mineralogy and Petrology 176, no. 7 (2021). http://dx.doi.org/10.1007/s00410-021-01806-4.

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AbstractDehydration reactions in the subducting slab liberate fluids causing major changes in rock density, volume and permeability. Although it is well known that the fluids can migrate and interact with the surrounding rocks, fluid pathways remain challenging to track and the consequences of fluid-rock interaction processes are often overlooked. In this study, we investigate pervasive fluid-rock interaction in a sequence of schists and mafic felses exposed in the Theodul Glacier Unit (TGU), Western Alps. This unit is embedded within metaophiolites of the Zermatt-Saas Zone and reached eclogit

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25

Hartmeier, Philip, Pierre Lanari, Jacob B. Forshaw, and Thorsten A. Markmann. "Tracking garnet dissolution kinetics in 3D using deep learning grain shape classification." Journal of Petrology, January 30, 2024. http://dx.doi.org/10.1093/petrology/egae005.

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Abstract The kinetics of fluid-driven metamorphic reactions are challenging to study in nature because of the tendency of metamorphic systems to converge towards chemical equilibrium. However, in cases where mineral textures that reflect incomplete reactions are preserved, kinetic processes may be investigated. Atoll garnet, a texture formed by the dissolution of a garnet’s core, has been described in 2D from thin sections of rocks worldwide. Quantifying the extent of this dissolution reaction requires sample-wide examination of hundreds of individual grains in 3D. In this study, we quantified

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26

Bouilhol, P., B. Debret, E. C. Inglis, et al. "Decoupling of inorganic and organic carbon during slab mantle devolatilisation." Nature Communications 13, no. 1 (2022). http://dx.doi.org/10.1038/s41467-022-27970-0.

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AbstractSerpentinites are an important sink for both inorganic and organic carbon, and their behavior during subduction is thought to play a fundamental role in the global cycling of carbon. Here we show that fluid-derived veins are preserved within the Zermatt-Saas ultra-high pressure serpentinites providing key evidence for carbonate mobility during serpentinite devolatilisation. We show through the O, C, and Sr isotope analyses of vein minerals and the host serpentinites that about 90% of the meta-serpentinite inorganic carbon is remobilized during slab devolatilisation. In contrast, graphi

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27

Kempf, Elias D., Jörg Hermann, Eric Reusser, Lukas P. Baumgartner, and Pierre Lanari. "The role of the antigorite + brucite to olivine reaction in subducted serpentinites (Zermatt, Switzerland)." Swiss Journal of Geosciences 113, no. 1 (2020). http://dx.doi.org/10.1186/s00015-020-00368-0.

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AbstractMetamorphic olivine formed by the reaction of antigorite + brucite is widespread in serpentinites that crop out in glacier-polished outcrops at the Unterer Theodulglacier, Zermatt. Olivine overgrows a relic magnetite mesh texture formed during ocean floor serpentinization. Serpentinization is associated with rodingitisation of mafic dykes. Metamorphic olivine coexists with magnetite, shows high Mg# of 94–97 and low trace element contents. A notable exception is 4 µg/g Boron (> 10 times primitive mantle), introduced during seafloor alteration and retained in metamorphic olivine. Oliv

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28

Dietrich, Julia, Jörg Hermann, and Thomas Pettke. "Magmatic genesis, hydration, and subduction of the tholeiitic eclogite-facies Allalin gabbro (Western Alps, Switzerland)." Swiss Journal of Geosciences 117, no. 1 (2024). http://dx.doi.org/10.1186/s00015-024-00461-8.

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AbstractThe Allalin gabbro of the Zermatt-Saas meta-ophiolite consists of variably metamorphosed Mg- to Fe-Ti-gabbros, troctolites, and anorthosites, which are crosscut by basaltic dykes. Field relationships of the various rock types and petrographic studies together with bulk rock and mineral chemical composition data allow the reconstruction of the complete geological history of the Allalin gabbro. With increasing magmatic differentiation, the incompatible element content in clinopyroxene increases (e.g., REEs and Zr by a factor of 5), whereas the Mg# decreases (from 86.4 to 74.6) as do the

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29

Rubatto, Daniela, Morgan Williams, Thorsten Andreas Markmann, Jörg Hermann, and Pierre Lanari. "Tracing fluid infiltration into oceanic crust up to ultra-high-pressure conditions." Contributions to Mineralogy and Petrology 178, no. 11 (2023). http://dx.doi.org/10.1007/s00410-023-02060-6.

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AbstractFluid–rock interaction within the altered oceanic crust and across the slab–mantle boundary during subduction facilitates element transfer, but the dynamics of fluid transport and fluid–rock exchange during upward fluid migration are still unclear. A study of metamorphic fluid–rock interaction within a section of subducted oceanic crust was carried out on eclogites and metasediments of the ultra-high-pressure Lago di Cignana Unit (NW Italian Alps). The P–T modeling of a quartzschist shows that garnet grew during the prograde and sporadically during the retrograde path and that phengite

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