High-pressure–low-temperature metamorphism and deformation in the Bündnerschiefer of the Engadine window: implications for the regional evolution of the eastern Central Alps
A study of the metamorphic and tectonic evolution of the Bündnerschiefer of the Engadine window shows that the individual nappes have been thinned by a large amount and that extension was active during and soon after nappe stacking.Based on contrasting P–T histories the Penninic Bündnerschiefer can...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
BOUSQUET*, R. [verfasserIn] OBERHÄNSLI, R. [verfasserIn] GOFFE, B. [verfasserIn] |
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| Format: |
E-Artikel |
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| Erschienen: |
Oxford, UK: Blackwell Science Ltd. ; 1998 |
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| Schlagwörter: |
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| Umfang: |
Online-Ressource |
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| Reproduktion: |
2004 ; Blackwell Publishing Journal Backfiles 1879-2005 |
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| Übergeordnetes Werk: |
In: Journal of metamorphic geology - Oxford [u.a.] : Wiley-Blackwell, 1983, 16(1998), 5, Seite 0 |
| Übergeordnetes Werk: |
volume:16 ; year:1998 ; number:5 ; pages:0 |
| Links: |
|---|
| DOI / URN: |
10.1111/j.1525-1314.1998.00161.x |
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NLEJ243175477 |
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| 520 | |a A study of the metamorphic and tectonic evolution of the Bündnerschiefer of the Engadine window shows that the individual nappes have been thinned by a large amount and that extension was active during and soon after nappe stacking.Based on contrasting P–T histories the Penninic Bündnerschiefer can be divided in two major units bounded by a horizontal contact. The lower (Mundin) unit shows typical high-P/low-T parageneses in metapelites (Mg-carpholite) and in metabasites (glaucophane); metamorphic conditions are estimated around 12 kbar, 375 °C. The upper (Arina) unit contains no specific high-P minerals; metamorphic conditions are estimated around 7 kbar, 325 °C. A minimum pressure gap of 5 kbar is thus observed. The contact between the two units is marked by a mappable normal shear zone with top-to-the-north-west sense of shear. Near the shear zone, fresh carpholite fibres trend parallel to the regional stretching lineation, implying that the detachment is an early structure active from the depth of stability of the carpholite and persisting during subsequent exhumation. The good preservation of carpholite and the absence of retrograde chloritoid below the shear zone show that exhumation occurred along a cooling path, whereas the deeper units are exhumed along an isothermal path. Exhumation probably occurred during convergence and further nappe stacking during the earlier Eocene. These results suggest that pre-collisional tectonic thinning of the Penninic oceanic units may be more widespread and significant than generally recognized. | ||
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10.1111/j.1525-1314.1998.00161.x doi (DE-627)NLEJ243175477 DE-627 ger DE-627 rakwb BOUSQUET*, R. verfasserin aut High-pressure–low-temperature metamorphism and deformation in the Bündnerschiefer of the Engadine window: implications for the regional evolution of the eastern Central Alps Oxford, UK Blackwell Science Ltd. 1998 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A study of the metamorphic and tectonic evolution of the Bündnerschiefer of the Engadine window shows that the individual nappes have been thinned by a large amount and that extension was active during and soon after nappe stacking.Based on contrasting P–T histories the Penninic Bündnerschiefer can be divided in two major units bounded by a horizontal contact. The lower (Mundin) unit shows typical high-P/low-T parageneses in metapelites (Mg-carpholite) and in metabasites (glaucophane); metamorphic conditions are estimated around 12 kbar, 375 °C. The upper (Arina) unit contains no specific high-P minerals; metamorphic conditions are estimated around 7 kbar, 325 °C. A minimum pressure gap of 5 kbar is thus observed. The contact between the two units is marked by a mappable normal shear zone with top-to-the-north-west sense of shear. Near the shear zone, fresh carpholite fibres trend parallel to the regional stretching lineation, implying that the detachment is an early structure active from the depth of stability of the carpholite and persisting during subsequent exhumation. The good preservation of carpholite and the absence of retrograde chloritoid below the shear zone show that exhumation occurred along a cooling path, whereas the deeper units are exhumed along an isothermal path. Exhumation probably occurred during convergence and further nappe stacking during the earlier Eocene. These results suggest that pre-collisional tectonic thinning of the Penninic oceanic units may be more widespread and significant than generally recognized. 2004 Blackwell Publishing Journal Backfiles 1879-2005 |2004|||||||||| decompression OBERHÄNSLI, R. verfasserin aut GOFFE, B. verfasserin aut JOLIVET, L. oth VIDAL, O. oth In Journal of metamorphic geology Oxford [u.a.] : Wiley-Blackwell, 1983 16(1998), 5, Seite 0 Online-Ressource (DE-627)NLEJ243926766 (DE-600)2020499-1 1525-1314 nnns volume:16 year:1998 number:5 pages:0 http://dx.doi.org/10.1111/j.1525-1314.1998.00161.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 16 1998 5 0 |
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10.1111/j.1525-1314.1998.00161.x doi (DE-627)NLEJ243175477 DE-627 ger DE-627 rakwb BOUSQUET*, R. verfasserin aut High-pressure–low-temperature metamorphism and deformation in the Bündnerschiefer of the Engadine window: implications for the regional evolution of the eastern Central Alps Oxford, UK Blackwell Science Ltd. 1998 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A study of the metamorphic and tectonic evolution of the Bündnerschiefer of the Engadine window shows that the individual nappes have been thinned by a large amount and that extension was active during and soon after nappe stacking.Based on contrasting P–T histories the Penninic Bündnerschiefer can be divided in two major units bounded by a horizontal contact. The lower (Mundin) unit shows typical high-P/low-T parageneses in metapelites (Mg-carpholite) and in metabasites (glaucophane); metamorphic conditions are estimated around 12 kbar, 375 °C. The upper (Arina) unit contains no specific high-P minerals; metamorphic conditions are estimated around 7 kbar, 325 °C. A minimum pressure gap of 5 kbar is thus observed. The contact between the two units is marked by a mappable normal shear zone with top-to-the-north-west sense of shear. Near the shear zone, fresh carpholite fibres trend parallel to the regional stretching lineation, implying that the detachment is an early structure active from the depth of stability of the carpholite and persisting during subsequent exhumation. The good preservation of carpholite and the absence of retrograde chloritoid below the shear zone show that exhumation occurred along a cooling path, whereas the deeper units are exhumed along an isothermal path. Exhumation probably occurred during convergence and further nappe stacking during the earlier Eocene. These results suggest that pre-collisional tectonic thinning of the Penninic oceanic units may be more widespread and significant than generally recognized. 2004 Blackwell Publishing Journal Backfiles 1879-2005 |2004|||||||||| decompression OBERHÄNSLI, R. verfasserin aut GOFFE, B. verfasserin aut JOLIVET, L. oth VIDAL, O. oth In Journal of metamorphic geology Oxford [u.a.] : Wiley-Blackwell, 1983 16(1998), 5, Seite 0 Online-Ressource (DE-627)NLEJ243926766 (DE-600)2020499-1 1525-1314 nnns volume:16 year:1998 number:5 pages:0 http://dx.doi.org/10.1111/j.1525-1314.1998.00161.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 16 1998 5 0 |
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10.1111/j.1525-1314.1998.00161.x doi (DE-627)NLEJ243175477 DE-627 ger DE-627 rakwb BOUSQUET*, R. verfasserin aut High-pressure–low-temperature metamorphism and deformation in the Bündnerschiefer of the Engadine window: implications for the regional evolution of the eastern Central Alps Oxford, UK Blackwell Science Ltd. 1998 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A study of the metamorphic and tectonic evolution of the Bündnerschiefer of the Engadine window shows that the individual nappes have been thinned by a large amount and that extension was active during and soon after nappe stacking.Based on contrasting P–T histories the Penninic Bündnerschiefer can be divided in two major units bounded by a horizontal contact. The lower (Mundin) unit shows typical high-P/low-T parageneses in metapelites (Mg-carpholite) and in metabasites (glaucophane); metamorphic conditions are estimated around 12 kbar, 375 °C. The upper (Arina) unit contains no specific high-P minerals; metamorphic conditions are estimated around 7 kbar, 325 °C. A minimum pressure gap of 5 kbar is thus observed. The contact between the two units is marked by a mappable normal shear zone with top-to-the-north-west sense of shear. Near the shear zone, fresh carpholite fibres trend parallel to the regional stretching lineation, implying that the detachment is an early structure active from the depth of stability of the carpholite and persisting during subsequent exhumation. The good preservation of carpholite and the absence of retrograde chloritoid below the shear zone show that exhumation occurred along a cooling path, whereas the deeper units are exhumed along an isothermal path. Exhumation probably occurred during convergence and further nappe stacking during the earlier Eocene. These results suggest that pre-collisional tectonic thinning of the Penninic oceanic units may be more widespread and significant than generally recognized. 2004 Blackwell Publishing Journal Backfiles 1879-2005 |2004|||||||||| decompression OBERHÄNSLI, R. verfasserin aut GOFFE, B. verfasserin aut JOLIVET, L. oth VIDAL, O. oth In Journal of metamorphic geology Oxford [u.a.] : Wiley-Blackwell, 1983 16(1998), 5, Seite 0 Online-Ressource (DE-627)NLEJ243926766 (DE-600)2020499-1 1525-1314 nnns volume:16 year:1998 number:5 pages:0 http://dx.doi.org/10.1111/j.1525-1314.1998.00161.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 16 1998 5 0 |
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10.1111/j.1525-1314.1998.00161.x doi (DE-627)NLEJ243175477 DE-627 ger DE-627 rakwb BOUSQUET*, R. verfasserin aut High-pressure–low-temperature metamorphism and deformation in the Bündnerschiefer of the Engadine window: implications for the regional evolution of the eastern Central Alps Oxford, UK Blackwell Science Ltd. 1998 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A study of the metamorphic and tectonic evolution of the Bündnerschiefer of the Engadine window shows that the individual nappes have been thinned by a large amount and that extension was active during and soon after nappe stacking.Based on contrasting P–T histories the Penninic Bündnerschiefer can be divided in two major units bounded by a horizontal contact. The lower (Mundin) unit shows typical high-P/low-T parageneses in metapelites (Mg-carpholite) and in metabasites (glaucophane); metamorphic conditions are estimated around 12 kbar, 375 °C. The upper (Arina) unit contains no specific high-P minerals; metamorphic conditions are estimated around 7 kbar, 325 °C. A minimum pressure gap of 5 kbar is thus observed. The contact between the two units is marked by a mappable normal shear zone with top-to-the-north-west sense of shear. Near the shear zone, fresh carpholite fibres trend parallel to the regional stretching lineation, implying that the detachment is an early structure active from the depth of stability of the carpholite and persisting during subsequent exhumation. The good preservation of carpholite and the absence of retrograde chloritoid below the shear zone show that exhumation occurred along a cooling path, whereas the deeper units are exhumed along an isothermal path. Exhumation probably occurred during convergence and further nappe stacking during the earlier Eocene. These results suggest that pre-collisional tectonic thinning of the Penninic oceanic units may be more widespread and significant than generally recognized. 2004 Blackwell Publishing Journal Backfiles 1879-2005 |2004|||||||||| decompression OBERHÄNSLI, R. verfasserin aut GOFFE, B. verfasserin aut JOLIVET, L. oth VIDAL, O. oth In Journal of metamorphic geology Oxford [u.a.] : Wiley-Blackwell, 1983 16(1998), 5, Seite 0 Online-Ressource (DE-627)NLEJ243926766 (DE-600)2020499-1 1525-1314 nnns volume:16 year:1998 number:5 pages:0 http://dx.doi.org/10.1111/j.1525-1314.1998.00161.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 16 1998 5 0 |
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10.1111/j.1525-1314.1998.00161.x doi (DE-627)NLEJ243175477 DE-627 ger DE-627 rakwb BOUSQUET*, R. verfasserin aut High-pressure–low-temperature metamorphism and deformation in the Bündnerschiefer of the Engadine window: implications for the regional evolution of the eastern Central Alps Oxford, UK Blackwell Science Ltd. 1998 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A study of the metamorphic and tectonic evolution of the Bündnerschiefer of the Engadine window shows that the individual nappes have been thinned by a large amount and that extension was active during and soon after nappe stacking.Based on contrasting P–T histories the Penninic Bündnerschiefer can be divided in two major units bounded by a horizontal contact. The lower (Mundin) unit shows typical high-P/low-T parageneses in metapelites (Mg-carpholite) and in metabasites (glaucophane); metamorphic conditions are estimated around 12 kbar, 375 °C. The upper (Arina) unit contains no specific high-P minerals; metamorphic conditions are estimated around 7 kbar, 325 °C. A minimum pressure gap of 5 kbar is thus observed. The contact between the two units is marked by a mappable normal shear zone with top-to-the-north-west sense of shear. Near the shear zone, fresh carpholite fibres trend parallel to the regional stretching lineation, implying that the detachment is an early structure active from the depth of stability of the carpholite and persisting during subsequent exhumation. The good preservation of carpholite and the absence of retrograde chloritoid below the shear zone show that exhumation occurred along a cooling path, whereas the deeper units are exhumed along an isothermal path. Exhumation probably occurred during convergence and further nappe stacking during the earlier Eocene. These results suggest that pre-collisional tectonic thinning of the Penninic oceanic units may be more widespread and significant than generally recognized. 2004 Blackwell Publishing Journal Backfiles 1879-2005 |2004|||||||||| decompression OBERHÄNSLI, R. verfasserin aut GOFFE, B. verfasserin aut JOLIVET, L. oth VIDAL, O. oth In Journal of metamorphic geology Oxford [u.a.] : Wiley-Blackwell, 1983 16(1998), 5, Seite 0 Online-Ressource (DE-627)NLEJ243926766 (DE-600)2020499-1 1525-1314 nnns volume:16 year:1998 number:5 pages:0 http://dx.doi.org/10.1111/j.1525-1314.1998.00161.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 16 1998 5 0 |
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BOUSQUET*, R. |
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10.1111/j.1525-1314.1998.00161.x |
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| title_sort |
high-pressure–low-temperature metamorphism and deformation in the bündnerschiefer of the engadine window: implications for the regional evolution of the eastern central alps |
| title_auth |
High-pressure–low-temperature metamorphism and deformation in the Bündnerschiefer of the Engadine window: implications for the regional evolution of the eastern Central Alps |
| abstract |
A study of the metamorphic and tectonic evolution of the Bündnerschiefer of the Engadine window shows that the individual nappes have been thinned by a large amount and that extension was active during and soon after nappe stacking.Based on contrasting P–T histories the Penninic Bündnerschiefer can be divided in two major units bounded by a horizontal contact. The lower (Mundin) unit shows typical high-P/low-T parageneses in metapelites (Mg-carpholite) and in metabasites (glaucophane); metamorphic conditions are estimated around 12 kbar, 375 °C. The upper (Arina) unit contains no specific high-P minerals; metamorphic conditions are estimated around 7 kbar, 325 °C. A minimum pressure gap of 5 kbar is thus observed. The contact between the two units is marked by a mappable normal shear zone with top-to-the-north-west sense of shear. Near the shear zone, fresh carpholite fibres trend parallel to the regional stretching lineation, implying that the detachment is an early structure active from the depth of stability of the carpholite and persisting during subsequent exhumation. The good preservation of carpholite and the absence of retrograde chloritoid below the shear zone show that exhumation occurred along a cooling path, whereas the deeper units are exhumed along an isothermal path. Exhumation probably occurred during convergence and further nappe stacking during the earlier Eocene. These results suggest that pre-collisional tectonic thinning of the Penninic oceanic units may be more widespread and significant than generally recognized. |
| abstractGer |
A study of the metamorphic and tectonic evolution of the Bündnerschiefer of the Engadine window shows that the individual nappes have been thinned by a large amount and that extension was active during and soon after nappe stacking.Based on contrasting P–T histories the Penninic Bündnerschiefer can be divided in two major units bounded by a horizontal contact. The lower (Mundin) unit shows typical high-P/low-T parageneses in metapelites (Mg-carpholite) and in metabasites (glaucophane); metamorphic conditions are estimated around 12 kbar, 375 °C. The upper (Arina) unit contains no specific high-P minerals; metamorphic conditions are estimated around 7 kbar, 325 °C. A minimum pressure gap of 5 kbar is thus observed. The contact between the two units is marked by a mappable normal shear zone with top-to-the-north-west sense of shear. Near the shear zone, fresh carpholite fibres trend parallel to the regional stretching lineation, implying that the detachment is an early structure active from the depth of stability of the carpholite and persisting during subsequent exhumation. The good preservation of carpholite and the absence of retrograde chloritoid below the shear zone show that exhumation occurred along a cooling path, whereas the deeper units are exhumed along an isothermal path. Exhumation probably occurred during convergence and further nappe stacking during the earlier Eocene. These results suggest that pre-collisional tectonic thinning of the Penninic oceanic units may be more widespread and significant than generally recognized. |
| abstract_unstemmed |
A study of the metamorphic and tectonic evolution of the Bündnerschiefer of the Engadine window shows that the individual nappes have been thinned by a large amount and that extension was active during and soon after nappe stacking.Based on contrasting P–T histories the Penninic Bündnerschiefer can be divided in two major units bounded by a horizontal contact. The lower (Mundin) unit shows typical high-P/low-T parageneses in metapelites (Mg-carpholite) and in metabasites (glaucophane); metamorphic conditions are estimated around 12 kbar, 375 °C. The upper (Arina) unit contains no specific high-P minerals; metamorphic conditions are estimated around 7 kbar, 325 °C. A minimum pressure gap of 5 kbar is thus observed. The contact between the two units is marked by a mappable normal shear zone with top-to-the-north-west sense of shear. Near the shear zone, fresh carpholite fibres trend parallel to the regional stretching lineation, implying that the detachment is an early structure active from the depth of stability of the carpholite and persisting during subsequent exhumation. The good preservation of carpholite and the absence of retrograde chloritoid below the shear zone show that exhumation occurred along a cooling path, whereas the deeper units are exhumed along an isothermal path. Exhumation probably occurred during convergence and further nappe stacking during the earlier Eocene. These results suggest that pre-collisional tectonic thinning of the Penninic oceanic units may be more widespread and significant than generally recognized. |
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High-pressure–low-temperature metamorphism and deformation in the Bündnerschiefer of the Engadine window: implications for the regional evolution of the eastern Central Alps |
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