Influence of deformation partitioning and metamorphic re-equilibration on P–T path reconstruction in the pre-Alpine basement of central Southern Alps (Northern Italy)
The dominant foliation (S2) in the metapelites of the Southalpine basement, near the western side of the Tertiary Adamello intrusive stock, is a Variscan greenschist facies planar fabric, slightly reworked during thick-skin Alpine tectonics. S2 is defined by muscovite and chlorite and was formed by...
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| Autor*in: |
SPALLA [verfasserIn] CARMINATI [verfasserIn] CERIANI [verfasserIn] |
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| Format: |
E-Artikel |
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| Erschienen: |
Oxford, UK: Blackwell Science Inc ; 1999 |
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| Umfang: |
Online-Ressource |
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| Reproduktion: |
2001 ; Blackwell Publishing Journal Backfiles 1879-2005 |
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| Übergeordnetes Werk: |
In: Journal of metamorphic geology - Oxford [u.a.] : Wiley-Blackwell, 1983, 17(1999), 3, Seite 0 |
| Übergeordnetes Werk: |
volume:17 ; year:1999 ; number:3 ; pages:0 |
| Links: |
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| DOI / URN: |
10.1046/j.1525-1314.1999.00199.x |
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NLEJ243175191 |
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| 245 | 1 | 0 | |a Influence of deformation partitioning and metamorphic re-equilibration on P–T path reconstruction in the pre-Alpine basement of central Southern Alps (Northern Italy) |
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| 520 | |a The dominant foliation (S2) in the metapelites of the Southalpine basement, near the western side of the Tertiary Adamello intrusive stock, is a Variscan greenschist facies planar fabric, slightly reworked during thick-skin Alpine tectonics. S2 is defined by muscovite and chlorite and was formed by decrenulation of pre-existing foliations, which are confined to metre-size, less-deformed domains and defined by biotite and white mica. The pre-S2 fabric is composite (D1a & D1b) and defined by contrasting amphibolite facies metamorphic assemblages in different residual sites. Cld+BtI+Grt+MsI+Pl+Qtz and St+BtII+Grt+MsII+Pl+Qtz assemblages mark D1a and D1b fabrics respectively; these developed during successive steps of a single, temperature-prograde polyphase event, rather than during separate tectonometamorphic imprints affecting different tectonic units, later coupled during a D2 greenschist facies stage. Thermobarometric estimates of assemblages formed during D1a, D1b and D2 show a transition from T =480–540 °C (during D1a) to T =570–660 °C (during D1b), corresponding to a slight pressure-increase from 0.75–0.95 GPa to 0.85–1.15 GPa. D2 greenschist retrogression corresponds to a pressure and temperature decrease (T <400–550 °C and P<0.3–0.4 GPa). This P–T–deformation–time path is inferred to be the result of uplift from a depth of c. 35 km, after Palaeozoic subduction and continental collision; it is consistent with models postulated for other metamorphic units of the Variscan Belt in Europe. This is the first documented example in the Southern Alps of temperature-prograde metamorphism before Palaeozoic collision. | ||
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10.1046/j.1525-1314.1999.00199.x doi (DE-627)NLEJ243175191 DE-627 ger DE-627 rakwb SPALLA verfasserin aut Influence of deformation partitioning and metamorphic re-equilibration on P–T path reconstruction in the pre-Alpine basement of central Southern Alps (Northern Italy) Oxford, UK Blackwell Science Inc 1999 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The dominant foliation (S2) in the metapelites of the Southalpine basement, near the western side of the Tertiary Adamello intrusive stock, is a Variscan greenschist facies planar fabric, slightly reworked during thick-skin Alpine tectonics. S2 is defined by muscovite and chlorite and was formed by decrenulation of pre-existing foliations, which are confined to metre-size, less-deformed domains and defined by biotite and white mica. The pre-S2 fabric is composite (D1a & D1b) and defined by contrasting amphibolite facies metamorphic assemblages in different residual sites. Cld+BtI+Grt+MsI+Pl+Qtz and St+BtII+Grt+MsII+Pl+Qtz assemblages mark D1a and D1b fabrics respectively; these developed during successive steps of a single, temperature-prograde polyphase event, rather than during separate tectonometamorphic imprints affecting different tectonic units, later coupled during a D2 greenschist facies stage. Thermobarometric estimates of assemblages formed during D1a, D1b and D2 show a transition from T =480–540 °C (during D1a) to T =570–660 °C (during D1b), corresponding to a slight pressure-increase from 0.75–0.95 GPa to 0.85–1.15 GPa. D2 greenschist retrogression corresponds to a pressure and temperature decrease (T <400–550 °C and P<0.3–0.4 GPa). This P–T–deformation–time path is inferred to be the result of uplift from a depth of c. 35 km, after Palaeozoic subduction and continental collision; it is consistent with models postulated for other metamorphic units of the Variscan Belt in Europe. This is the first documented example in the Southern Alps of temperature-prograde metamorphism before Palaeozoic collision. 2001 Blackwell Publishing Journal Backfiles 1879-2005 |2001|||||||||| central Southern Alps CARMINATI verfasserin aut CERIANI verfasserin aut OLIVA oth BATTAGLIA oth In Journal of metamorphic geology Oxford [u.a.] : Wiley-Blackwell, 1983 17(1999), 3, Seite 0 Online-Ressource (DE-627)NLEJ243926766 (DE-600)2020499-1 1525-1314 nnns volume:17 year:1999 number:3 pages:0 http://dx.doi.org/10.1046/j.1525-1314.1999.00199.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 17 1999 3 0 |
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10.1046/j.1525-1314.1999.00199.x doi (DE-627)NLEJ243175191 DE-627 ger DE-627 rakwb SPALLA verfasserin aut Influence of deformation partitioning and metamorphic re-equilibration on P–T path reconstruction in the pre-Alpine basement of central Southern Alps (Northern Italy) Oxford, UK Blackwell Science Inc 1999 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The dominant foliation (S2) in the metapelites of the Southalpine basement, near the western side of the Tertiary Adamello intrusive stock, is a Variscan greenschist facies planar fabric, slightly reworked during thick-skin Alpine tectonics. S2 is defined by muscovite and chlorite and was formed by decrenulation of pre-existing foliations, which are confined to metre-size, less-deformed domains and defined by biotite and white mica. The pre-S2 fabric is composite (D1a & D1b) and defined by contrasting amphibolite facies metamorphic assemblages in different residual sites. Cld+BtI+Grt+MsI+Pl+Qtz and St+BtII+Grt+MsII+Pl+Qtz assemblages mark D1a and D1b fabrics respectively; these developed during successive steps of a single, temperature-prograde polyphase event, rather than during separate tectonometamorphic imprints affecting different tectonic units, later coupled during a D2 greenschist facies stage. Thermobarometric estimates of assemblages formed during D1a, D1b and D2 show a transition from T =480–540 °C (during D1a) to T =570–660 °C (during D1b), corresponding to a slight pressure-increase from 0.75–0.95 GPa to 0.85–1.15 GPa. D2 greenschist retrogression corresponds to a pressure and temperature decrease (T <400–550 °C and P<0.3–0.4 GPa). This P–T–deformation–time path is inferred to be the result of uplift from a depth of c. 35 km, after Palaeozoic subduction and continental collision; it is consistent with models postulated for other metamorphic units of the Variscan Belt in Europe. This is the first documented example in the Southern Alps of temperature-prograde metamorphism before Palaeozoic collision. 2001 Blackwell Publishing Journal Backfiles 1879-2005 |2001|||||||||| central Southern Alps CARMINATI verfasserin aut CERIANI verfasserin aut OLIVA oth BATTAGLIA oth In Journal of metamorphic geology Oxford [u.a.] : Wiley-Blackwell, 1983 17(1999), 3, Seite 0 Online-Ressource (DE-627)NLEJ243926766 (DE-600)2020499-1 1525-1314 nnns volume:17 year:1999 number:3 pages:0 http://dx.doi.org/10.1046/j.1525-1314.1999.00199.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 17 1999 3 0 |
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10.1046/j.1525-1314.1999.00199.x doi (DE-627)NLEJ243175191 DE-627 ger DE-627 rakwb SPALLA verfasserin aut Influence of deformation partitioning and metamorphic re-equilibration on P–T path reconstruction in the pre-Alpine basement of central Southern Alps (Northern Italy) Oxford, UK Blackwell Science Inc 1999 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The dominant foliation (S2) in the metapelites of the Southalpine basement, near the western side of the Tertiary Adamello intrusive stock, is a Variscan greenschist facies planar fabric, slightly reworked during thick-skin Alpine tectonics. S2 is defined by muscovite and chlorite and was formed by decrenulation of pre-existing foliations, which are confined to metre-size, less-deformed domains and defined by biotite and white mica. The pre-S2 fabric is composite (D1a & D1b) and defined by contrasting amphibolite facies metamorphic assemblages in different residual sites. Cld+BtI+Grt+MsI+Pl+Qtz and St+BtII+Grt+MsII+Pl+Qtz assemblages mark D1a and D1b fabrics respectively; these developed during successive steps of a single, temperature-prograde polyphase event, rather than during separate tectonometamorphic imprints affecting different tectonic units, later coupled during a D2 greenschist facies stage. Thermobarometric estimates of assemblages formed during D1a, D1b and D2 show a transition from T =480–540 °C (during D1a) to T =570–660 °C (during D1b), corresponding to a slight pressure-increase from 0.75–0.95 GPa to 0.85–1.15 GPa. D2 greenschist retrogression corresponds to a pressure and temperature decrease (T <400–550 °C and P<0.3–0.4 GPa). This P–T–deformation–time path is inferred to be the result of uplift from a depth of c. 35 km, after Palaeozoic subduction and continental collision; it is consistent with models postulated for other metamorphic units of the Variscan Belt in Europe. This is the first documented example in the Southern Alps of temperature-prograde metamorphism before Palaeozoic collision. 2001 Blackwell Publishing Journal Backfiles 1879-2005 |2001|||||||||| central Southern Alps CARMINATI verfasserin aut CERIANI verfasserin aut OLIVA oth BATTAGLIA oth In Journal of metamorphic geology Oxford [u.a.] : Wiley-Blackwell, 1983 17(1999), 3, Seite 0 Online-Ressource (DE-627)NLEJ243926766 (DE-600)2020499-1 1525-1314 nnns volume:17 year:1999 number:3 pages:0 http://dx.doi.org/10.1046/j.1525-1314.1999.00199.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 17 1999 3 0 |
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10.1046/j.1525-1314.1999.00199.x doi (DE-627)NLEJ243175191 DE-627 ger DE-627 rakwb SPALLA verfasserin aut Influence of deformation partitioning and metamorphic re-equilibration on P–T path reconstruction in the pre-Alpine basement of central Southern Alps (Northern Italy) Oxford, UK Blackwell Science Inc 1999 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The dominant foliation (S2) in the metapelites of the Southalpine basement, near the western side of the Tertiary Adamello intrusive stock, is a Variscan greenschist facies planar fabric, slightly reworked during thick-skin Alpine tectonics. S2 is defined by muscovite and chlorite and was formed by decrenulation of pre-existing foliations, which are confined to metre-size, less-deformed domains and defined by biotite and white mica. The pre-S2 fabric is composite (D1a & D1b) and defined by contrasting amphibolite facies metamorphic assemblages in different residual sites. Cld+BtI+Grt+MsI+Pl+Qtz and St+BtII+Grt+MsII+Pl+Qtz assemblages mark D1a and D1b fabrics respectively; these developed during successive steps of a single, temperature-prograde polyphase event, rather than during separate tectonometamorphic imprints affecting different tectonic units, later coupled during a D2 greenschist facies stage. Thermobarometric estimates of assemblages formed during D1a, D1b and D2 show a transition from T =480–540 °C (during D1a) to T =570–660 °C (during D1b), corresponding to a slight pressure-increase from 0.75–0.95 GPa to 0.85–1.15 GPa. D2 greenschist retrogression corresponds to a pressure and temperature decrease (T <400–550 °C and P<0.3–0.4 GPa). This P–T–deformation–time path is inferred to be the result of uplift from a depth of c. 35 km, after Palaeozoic subduction and continental collision; it is consistent with models postulated for other metamorphic units of the Variscan Belt in Europe. This is the first documented example in the Southern Alps of temperature-prograde metamorphism before Palaeozoic collision. 2001 Blackwell Publishing Journal Backfiles 1879-2005 |2001|||||||||| central Southern Alps CARMINATI verfasserin aut CERIANI verfasserin aut OLIVA oth BATTAGLIA oth In Journal of metamorphic geology Oxford [u.a.] : Wiley-Blackwell, 1983 17(1999), 3, Seite 0 Online-Ressource (DE-627)NLEJ243926766 (DE-600)2020499-1 1525-1314 nnns volume:17 year:1999 number:3 pages:0 http://dx.doi.org/10.1046/j.1525-1314.1999.00199.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 17 1999 3 0 |
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10.1046/j.1525-1314.1999.00199.x doi (DE-627)NLEJ243175191 DE-627 ger DE-627 rakwb SPALLA verfasserin aut Influence of deformation partitioning and metamorphic re-equilibration on P–T path reconstruction in the pre-Alpine basement of central Southern Alps (Northern Italy) Oxford, UK Blackwell Science Inc 1999 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The dominant foliation (S2) in the metapelites of the Southalpine basement, near the western side of the Tertiary Adamello intrusive stock, is a Variscan greenschist facies planar fabric, slightly reworked during thick-skin Alpine tectonics. S2 is defined by muscovite and chlorite and was formed by decrenulation of pre-existing foliations, which are confined to metre-size, less-deformed domains and defined by biotite and white mica. The pre-S2 fabric is composite (D1a & D1b) and defined by contrasting amphibolite facies metamorphic assemblages in different residual sites. Cld+BtI+Grt+MsI+Pl+Qtz and St+BtII+Grt+MsII+Pl+Qtz assemblages mark D1a and D1b fabrics respectively; these developed during successive steps of a single, temperature-prograde polyphase event, rather than during separate tectonometamorphic imprints affecting different tectonic units, later coupled during a D2 greenschist facies stage. Thermobarometric estimates of assemblages formed during D1a, D1b and D2 show a transition from T =480–540 °C (during D1a) to T =570–660 °C (during D1b), corresponding to a slight pressure-increase from 0.75–0.95 GPa to 0.85–1.15 GPa. D2 greenschist retrogression corresponds to a pressure and temperature decrease (T <400–550 °C and P<0.3–0.4 GPa). This P–T–deformation–time path is inferred to be the result of uplift from a depth of c. 35 km, after Palaeozoic subduction and continental collision; it is consistent with models postulated for other metamorphic units of the Variscan Belt in Europe. This is the first documented example in the Southern Alps of temperature-prograde metamorphism before Palaeozoic collision. 2001 Blackwell Publishing Journal Backfiles 1879-2005 |2001|||||||||| central Southern Alps CARMINATI verfasserin aut CERIANI verfasserin aut OLIVA oth BATTAGLIA oth In Journal of metamorphic geology Oxford [u.a.] : Wiley-Blackwell, 1983 17(1999), 3, Seite 0 Online-Ressource (DE-627)NLEJ243926766 (DE-600)2020499-1 1525-1314 nnns volume:17 year:1999 number:3 pages:0 http://dx.doi.org/10.1046/j.1525-1314.1999.00199.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 17 1999 3 0 |
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Influence of deformation partitioning and metamorphic re-equilibration on P–T path reconstruction in the pre-Alpine basement of central Southern Alps (Northern Italy) central Southern Alps |
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Influence of deformation partitioning and metamorphic re-equilibration on P–T path reconstruction in the pre-Alpine basement of central Southern Alps (Northern Italy) |
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influence of deformation partitioning and metamorphic re-equilibration on p–t path reconstruction in the pre-alpine basement of central southern alps (northern italy) |
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Influence of deformation partitioning and metamorphic re-equilibration on P–T path reconstruction in the pre-Alpine basement of central Southern Alps (Northern Italy) |
| abstract |
The dominant foliation (S2) in the metapelites of the Southalpine basement, near the western side of the Tertiary Adamello intrusive stock, is a Variscan greenschist facies planar fabric, slightly reworked during thick-skin Alpine tectonics. S2 is defined by muscovite and chlorite and was formed by decrenulation of pre-existing foliations, which are confined to metre-size, less-deformed domains and defined by biotite and white mica. The pre-S2 fabric is composite (D1a & D1b) and defined by contrasting amphibolite facies metamorphic assemblages in different residual sites. Cld+BtI+Grt+MsI+Pl+Qtz and St+BtII+Grt+MsII+Pl+Qtz assemblages mark D1a and D1b fabrics respectively; these developed during successive steps of a single, temperature-prograde polyphase event, rather than during separate tectonometamorphic imprints affecting different tectonic units, later coupled during a D2 greenschist facies stage. Thermobarometric estimates of assemblages formed during D1a, D1b and D2 show a transition from T =480–540 °C (during D1a) to T =570–660 °C (during D1b), corresponding to a slight pressure-increase from 0.75–0.95 GPa to 0.85–1.15 GPa. D2 greenschist retrogression corresponds to a pressure and temperature decrease (T <400–550 °C and P<0.3–0.4 GPa). This P–T–deformation–time path is inferred to be the result of uplift from a depth of c. 35 km, after Palaeozoic subduction and continental collision; it is consistent with models postulated for other metamorphic units of the Variscan Belt in Europe. This is the first documented example in the Southern Alps of temperature-prograde metamorphism before Palaeozoic collision. |
| abstractGer |
The dominant foliation (S2) in the metapelites of the Southalpine basement, near the western side of the Tertiary Adamello intrusive stock, is a Variscan greenschist facies planar fabric, slightly reworked during thick-skin Alpine tectonics. S2 is defined by muscovite and chlorite and was formed by decrenulation of pre-existing foliations, which are confined to metre-size, less-deformed domains and defined by biotite and white mica. The pre-S2 fabric is composite (D1a & D1b) and defined by contrasting amphibolite facies metamorphic assemblages in different residual sites. Cld+BtI+Grt+MsI+Pl+Qtz and St+BtII+Grt+MsII+Pl+Qtz assemblages mark D1a and D1b fabrics respectively; these developed during successive steps of a single, temperature-prograde polyphase event, rather than during separate tectonometamorphic imprints affecting different tectonic units, later coupled during a D2 greenschist facies stage. Thermobarometric estimates of assemblages formed during D1a, D1b and D2 show a transition from T =480–540 °C (during D1a) to T =570–660 °C (during D1b), corresponding to a slight pressure-increase from 0.75–0.95 GPa to 0.85–1.15 GPa. D2 greenschist retrogression corresponds to a pressure and temperature decrease (T <400–550 °C and P<0.3–0.4 GPa). This P–T–deformation–time path is inferred to be the result of uplift from a depth of c. 35 km, after Palaeozoic subduction and continental collision; it is consistent with models postulated for other metamorphic units of the Variscan Belt in Europe. This is the first documented example in the Southern Alps of temperature-prograde metamorphism before Palaeozoic collision. |
| abstract_unstemmed |
The dominant foliation (S2) in the metapelites of the Southalpine basement, near the western side of the Tertiary Adamello intrusive stock, is a Variscan greenschist facies planar fabric, slightly reworked during thick-skin Alpine tectonics. S2 is defined by muscovite and chlorite and was formed by decrenulation of pre-existing foliations, which are confined to metre-size, less-deformed domains and defined by biotite and white mica. The pre-S2 fabric is composite (D1a & D1b) and defined by contrasting amphibolite facies metamorphic assemblages in different residual sites. Cld+BtI+Grt+MsI+Pl+Qtz and St+BtII+Grt+MsII+Pl+Qtz assemblages mark D1a and D1b fabrics respectively; these developed during successive steps of a single, temperature-prograde polyphase event, rather than during separate tectonometamorphic imprints affecting different tectonic units, later coupled during a D2 greenschist facies stage. Thermobarometric estimates of assemblages formed during D1a, D1b and D2 show a transition from T =480–540 °C (during D1a) to T =570–660 °C (during D1b), corresponding to a slight pressure-increase from 0.75–0.95 GPa to 0.85–1.15 GPa. D2 greenschist retrogression corresponds to a pressure and temperature decrease (T <400–550 °C and P<0.3–0.4 GPa). This P–T–deformation–time path is inferred to be the result of uplift from a depth of c. 35 km, after Palaeozoic subduction and continental collision; it is consistent with models postulated for other metamorphic units of the Variscan Belt in Europe. This is the first documented example in the Southern Alps of temperature-prograde metamorphism before Palaeozoic collision. |
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Influence of deformation partitioning and metamorphic re-equilibration on P–T path reconstruction in the pre-Alpine basement of central Southern Alps (Northern Italy) |
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