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Zermatt-Saas Zone

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Journal Article
Published: 10 January 2024
Journal of the Geological Society (2024) 181 (1): jgs2023-142.
...Sara Sibil Giuseppina Guerini; Paola Tartarotti Abstract The ZermattSaas Zone is an eclogite-facies meta-ophiolite unit representing the fossil oceanic lithosphere of the Jurassic Tethys. In the Italian Northwestern Alps, the ZermattSaas Zone includes a chaotic rock unit, or mélange, c. 40 m...
FIGURES | View All (7)
Journal Article
Published: 03 May 2017
Geological Magazine (2018) 155 (2): 298–315.
...GISELLA REBAY; DAVIDE ZANONI; ANTONIO LANGONE; PIETRO LUONI; MASSIMO TIEPOLO; MARIA IOLE SPALLA Abstract The 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...
FIGURES | View All (7)
Journal Article
Published: 01 January 1991
European Journal of Mineralogy (1991) 3 (1): 7–17.
Journal Article
Published: 01 July 1986
Journal of the Geological Society (1986) 143 (4): 607–618.
...A. C. BARNICOAT; N. FRY Abstract Within the ZermattSaas ophiolite zone of the western Alps a record of polystadial high-pressure metamorphism is well preserved. Early blueschist assemblages, retained as inclusions in garnets, were succeeded by eclogitic assemblages which in some rocks contained...
Journal Article
Published: 06 May 2025
Journal of the Geological Society (2025) 182 (4): jgs2025-041.
...Thomas Gusmeo; Gisella Rebay; Maria Iole Spalla; Davide Zanoni Within the Zermatt-Saas Zone (Western Alps), the Riffelberg-Garten Unit is part of the ophiolitic meta-sedimentary cover, which in the uppermost Valtournenche valley contains metabasite (some with a gabbroic texture) and minor...
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Series: Geological Society, London, Special Publications
Published: 01 January 2011
DOI: 10.1144/SP360.8
EISBN: 9781862394483
... be obtained from natural serpentinites exhumed from ancient subduction zones. We examine the microstructural record of HP-metamorphic ( P c. 2±0.5 GPa, T c. 550±50 °C) serpentinites exposed in the ZermattSaas zone, Western Alps, using optical and scanning electron microscopy with electron backscatter...
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Journal Article
Published: 01 June 2018
American Mineralogist (2018) 103 (6): 1002–1005.
... serpentinites of the Zermatt-Saas Zone (ZSZ) of the Western Alps allows the recrystallization of such rocks at UHP conditions ( P = 2.8–3.5 GPa, T = 600–670 °C) to be determined. Such conditions are similar to those registered by the nearby Cignana unit, a main Alpine area for UHP metamorphism, where coesite...
FIGURES
Journal Article
Published: 01 December 2016
European Journal of Mineralogy (2016) 28 (6): 1215–1232.
...) of the southern Dora-Maira Massif or the Lago di Cignana Unit (LCU) of the Piemonte Zermatt-Saas Zone. However, similar talcschists have never been reported from these units. Two samples of coesite-bearing, chloritoid + garnet ± glaucophane talcschist collected from two different specimens of quern-stones have...
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Journal Article
Published: 01 August 1987
Journal of the Geological Society (1987) 144 (4): 653–659.
...N. FRY; A. C. BARNICOAT Abstract Five mineralogical stages are recognized in the metamorphism of Alpine ophiolites from one area in the ZermattSaas zone. Constraints on P-T values indicate an abrupt change at the metamorphic peak (550–600 °C, 17–20 kbar) from a cold positive slope of 25°C/kbar...
Image
 Map showing contoured Nadai strain magnitude (Et) in Gran Paradiso Massif; contouring is based on 176 samples. The highest strains occur in the western part of the Gran Paradiso Unit. It should be noted that there is no distinct increase in strain magnitude towards the upper and lower nappe contacts of the Gran Paradiso Unit; in particular, the upper contact against the Zermatt–Saas Zone in the NE near Ronco is characterized by very small strain magnitudes (Zermatt–Saas Zone surrounding Gran Paradiso Massif is shown in white). The Erfaulet Unit forms the base of the exposed section and crops out in major valleys.
Published: 01 December 2007
and lower nappe contacts of the Gran Paradiso Unit; in particular, the upper contact against the ZermattSaas Zone in the NE near Ronco is characterized by very small strain magnitudes (ZermattSaas Zone surrounding Gran Paradiso Massif is shown in white). The Erfaulet Unit forms the base of the exposed
Image
 (a) Lineation map for the Gran Paradiso massif and (b) the contact between the Gran Paradiso massif and the Zermatt–Saas zone near Lillaz; arrowheads indicate plunging direction.
Published: 01 September 2004
Fig. 5.  ( a ) Lineation map for the Gran Paradiso massif and ( b ) the contact between the Gran Paradiso massif and the ZermattSaas zone near Lillaz; arrowheads indicate plunging direction.
Image
 Maps showing K values for samples and contours of K value for the Gran Paradiso massif (a) and contact of the latter with the Zermatt–Saas zone (b). Cross-section C–C′ in Figure 11 is indicated.
Published: 01 September 2004
Fig. 10.  Maps showing K values for samples and contours of K value for the Gran Paradiso massif ( a ) and contact of the latter with the ZermattSaas zone ( b ). Cross-section C–C′ in Figure 11 is indicated.
Image
 Maps showing Nadai strain magnitude (Et) for each sample and contours of Et for Gran Paradiso massif (a) and contact of latter with Zermatt–Saas zone (b). Cross-section B–B′ in Figure 9 is indicated.
Published: 01 September 2004
Fig. 8.  Maps showing Nadai strain magnitude ( E t ) for each sample and contours of E t for Gran Paradiso massif ( a ) and contact of latter with ZermattSaas zone ( b ). Cross-section B–B′ in Figure 9 is indicated.
Image
 Cross-section B–B′ showing contoured Nadai strain magnitude and its relation to nappe contact within the Gran Paradiso massif, and relation between the latter and the Zermatt–Saas zone; highest Nadai strains occur within the Gran Paradiso unit.
Published: 01 September 2004
Fig. 9.  Cross-section B–B′ showing contoured Nadai strain magnitude and its relation to nappe contact within the Gran Paradiso massif, and relation between the latter and the ZermattSaas zone; highest Nadai strains occur within the Gran Paradiso unit.
Image
P–T diagram based on present study. P–T paths from subduction and continental collision complexes are shown for comparison. Data from Ghent et al. (1987), Jamieson (1990), and Carswell (1990). Z, Zermatt-Saas zone (metaophiolites); EMC, eclogitic micaschist complex of the Sesia zone; EPMS, East Pond Metamorphic Suite; FL, Fleur de Lys Supergroup.
Published: 31 January 2001
Fig. 11. P–T diagram based on present study. P–T paths from subduction and continental collision complexes are shown for comparison. Data from Ghent et al. ( 1987 ), Jamieson ( 1990 ), and Carswell ( 1990 ). Z, Zermatt-Saas zone (metaophiolites); EMC, eclogitic micaschist complex of the Sesia
Image
 Cross section C–C′ showing contoured K value and its relation to the nappe contact within Gran Paradiso massif, and relation between the latter and the Zermatt–Saas zone; K values >1 are, in general, restricted to the Erfaulet unit and are interpreted to occur in hinges of early west-vergent folds. Comparison with Figure 9 suggests that zones of high strain magnitude largely coincide with higher K values.
Published: 01 September 2004
Fig. 11.  Cross section C–C′ showing contoured K value and its relation to the nappe contact within Gran Paradiso massif, and relation between the latter and the ZermattSaas zone; K values >1 are, in general, restricted to the Erfaulet unit and are interpreted to occur in hinges of early
Image
Tectonic map of the Western Alps and Northern Apennines (adapted from Bigi et al., 1990, Beltrando et al., 2014, and Carmignani et al., 2012) and location of deposits studied (numbers as in Table 1). Co, Combin Zone; DB, Dent Blanche nappe; ECM, External Crystalline Massifs; GP, Gran Paradiso massif; MV, Monviso massif; MR, M. Rosa massif; QS, Queyras Schistes Lustrés; SL, Sempione Line; SZ, Sesia Zone; VM, Voltri massif; VZ, Valais Zone; ZS, Zermatt-Saas Zone. (Online version in colour.)
Published: 01 January 2018
; GP, Gran Paradiso massif; MV, Monviso massif; MR, M. Rosa massif; QS, Queyras Schistes Lustrés; SL, Sempione Line; SZ, Sesia Zone; VM, Voltri massif; VZ, Valais Zone; ZS, Zermatt-Saas Zone. (Online version in colour.)
Image
Relationship between the temperature conditions of tourmaline formation and the [6]Al content (sum of Al at the Y and Z sites). Also plotted are data from samples R6b (1) coesite-bearing mantle of the tourmaline, Erzgebirge, Germany (Marschall et al. 2009), (2) dravite inclusion from a small pyrope crystal from Dora Maira (Schreyer 1985), and (3) a tourmaline from Lago di Cignana, Zermatt-Saas zone, Western Alps (Reinecke 1991). Vertical bars = average estimated standard deviation (1σ).
Published: 01 January 2010
from a small pyrope crystal from Dora Maira ( Schreyer 1985 ), and (3) a tourmaline from Lago di Cignana, Zermatt-Saas zone, Western Alps ( Reinecke 1991 ). Vertical bars = average estimated standard deviation (1σ).
Image
Summary of the estimated P–T values for mafic elements and the meta-sedimentary RGU matrix characterizing the D2 assemblages and the successive re-equilibration during D3 and D4 tectono-metamorphic stages (qualitatively evaluated; see discussion in the text) compared with the P–T climax metamorphic conditions from: 1, Cignana (Reinecke 1991; Skora et al. 2015); 2, upper Valtournenche serpentinites (Rebay et al. 2012, 2018); 3, eclogitized rodingites from upper Valtournenche (Zanoni et al. 2016); 4, Theodul Glacier continental unit eclogites (Weber and Bucher 2015); 5, Zermatt-Saas Zone eclogite adjacent to the Theodul Glacier unit (Weber and Bucher 2015); 6, Créton ultrahigh-pressure serpentinites (Luoni et al. 2018, 2021); 7, Zermatt-Saas metabasite near Lake Goillet (Angiboust et al. 2009). Lw-EC, lawsonite–eclogite facies; Dry EC, dry eclogite facies; Ep–EC, epidote–eclogite facies; Amp–EC, amphibole–eclogite facies; GS, greenschist facies; EA, epidote–amphibolite facies; BS, blueschist facies; AM, amphibolite facies; HGR, high-pressure granulite facies; GR, granulite facies.
Published: 06 May 2025
, Zermatt-Saas Zone eclogite adjacent to the Theodul Glacier unit ( Weber and Bucher 2015 ); 6, Créton ultrahigh-pressure serpentinites ( Luoni et al. 2018 , 2021 ); 7, Zermatt-Saas metabasite near Lake Goillet ( Angiboust et al. 2009 ). Lw-EC, lawsonite–eclogite facies; Dry EC, dry eclogite facies; Ep
Image
Geological and structural outline of the upper Valtournanche. (a) Tectonic sketch map of the Western Alps and its location within Europe and the Mediterranean region. (b) Interpretative tectonic sketch of the upper Valtournanche redrawn from the geotectonic map of the Aosta Valley (De Giusti et al.2003); area indicated by the thick white square in (a). ZSZ – Zermatt-Saas Zone; PCB – Pancherot-Cime Bianche-Bettaforca unit; CZ – Combin Zone; DB – Dent Blanche nappe; CL – Cignana Lake. (c) Outcrop map with the foliation trajectories of the metaophiolites of the upper Valtournanche (ZSZ), synthesized from an original mapping (unpublished) at 1:5000 scale. Relative chronology of superimposed foliation is shown in the legend. Topography redrawn from the technical map of the Val d'Aosta Regional Administration without hydrography.
Published: 03 May 2017
Giusti et al. 2003 ); area indicated by the thick white square in (a). ZSZ – Zermatt-Saas Zone; PCB – Pancherot-Cime Bianche-Bettaforca unit; CZ – Combin Zone; DB – Dent Blanche nappe; CL – Cignana Lake. (c) Outcrop map with the foliation trajectories of the metaophiolites of the upper Valtournanche