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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...
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...
FIGURES | View All (14)
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 ( E  t ) in Gran Paradiso Mass...
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 betw...
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 ...
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 ( E  t ) for each sample and contours o...
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 relatio...
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 contin...
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 napp...
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...
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...
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
Geological and structural outline of the upper Valtournanche. (a) Tectonic ...
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
Image
Simplified tectonic map of the <span class="search-highlight">Zermatt</span>-<span class="search-highlight">Saas</span> ophiolite <span class="search-highlight">zone</span> (modified after ...
Published: 01 May 2005
F igure 1. Simplified tectonic map of the Zermatt-Saas ophiolite zone (modified after Bearth 1967 ). The Mischabel and Monte Rosa nappe are Penninic crystalline basement, whereas the Dent Blanche nappe is of Austroalpine origin. LdC = Lago di Cignana coesite locality ( Reinecke 1991 ).
Journal Article
Published: 01 September 2004
Journal of the Geological Society (2004) 161 (5): 875–884.
...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. ...
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