P-T-t Paths and Their Significance. Metamorphic Field Gradient –Trend of Thermal Maxima Across...
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Transcript of P-T-t Paths and Their Significance. Metamorphic Field Gradient –Trend of Thermal Maxima Across...
![Page 1: P-T-t Paths and Their Significance. Metamorphic Field Gradient –Trend of Thermal Maxima Across Metamorphic Facies.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649cc05503460f94986d59/html5/thumbnails/1.jpg)
P-T-t Paths and Their Significance
![Page 2: P-T-t Paths and Their Significance. Metamorphic Field Gradient –Trend of Thermal Maxima Across Metamorphic Facies.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649cc05503460f94986d59/html5/thumbnails/2.jpg)
Metamorphic Field Gradient –Trend of Thermal Maxima Across Metamorphic Facies
![Page 3: P-T-t Paths and Their Significance. Metamorphic Field Gradient –Trend of Thermal Maxima Across Metamorphic Facies.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649cc05503460f94986d59/html5/thumbnails/3.jpg)
Clockwise P-T-t Path
![Page 4: P-T-t Paths and Their Significance. Metamorphic Field Gradient –Trend of Thermal Maxima Across Metamorphic Facies.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649cc05503460f94986d59/html5/thumbnails/4.jpg)
P-T-t Path Reflecting Crustal Thickening
![Page 5: P-T-t Paths and Their Significance. Metamorphic Field Gradient –Trend of Thermal Maxima Across Metamorphic Facies.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649cc05503460f94986d59/html5/thumbnails/5.jpg)
A Crustal Thickening P-T-t Path
Central Indian Tectonic Zone (Proterozoic)
![Page 6: P-T-t Paths and Their Significance. Metamorphic Field Gradient –Trend of Thermal Maxima Across Metamorphic Facies.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649cc05503460f94986d59/html5/thumbnails/6.jpg)
Early Barrovian P-T-t Path showing effects of later arc-related magmatism and variable uplift/erosion
P-T-t Path for Connemara
Inlier
![Page 7: P-T-t Paths and Their Significance. Metamorphic Field Gradient –Trend of Thermal Maxima Across Metamorphic Facies.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649cc05503460f94986d59/html5/thumbnails/7.jpg)
P-T-t Path of Burial Metamorphism
Field gradient 25 oC/Km
![Page 8: P-T-t Paths and Their Significance. Metamorphic Field Gradient –Trend of Thermal Maxima Across Metamorphic Facies.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649cc05503460f94986d59/html5/thumbnails/8.jpg)
Subduction and exhumation in 10 Ma. Prograde, retrograde stages of a single metamorphic cycle
(1, 2) Gt-hbl thermometry Gt-amph-plag-qtz barometry(3) Jd-Ky isograd (eclogite facies)(4) Plag-Cor isograd (granulite facies)5) Gt-Hbl thermometry, gt-amph-plag-qtz barometry
SHRIMP U-Pb dating of zircon
Alpine orogeny, Rhodope Region, Greece
Liati and Gebauer, 1999
10 oC/Km
30 oC/Km
![Page 9: P-T-t Paths and Their Significance. Metamorphic Field Gradient –Trend of Thermal Maxima Across Metamorphic Facies.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649cc05503460f94986d59/html5/thumbnails/9.jpg)
Clockwise P-T-t Path in a Back-Arc BasinODP Site 976 between Spain and Morocco – Miocene extensional basin
Exhumation in 6 Ma @ 4km/Ma
![Page 10: P-T-t Paths and Their Significance. Metamorphic Field Gradient –Trend of Thermal Maxima Across Metamorphic Facies.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649cc05503460f94986d59/html5/thumbnails/10.jpg)
Alpine Uplift Rates from Geothermobarometry and 40Ar-39Ar Dating
3.6
2.9
1.80.5
mm/an20 Ma
18 Ma
18 Ma13.3 Ma
7.1 Ma
Uplift Rate
![Page 11: P-T-t Paths and Their Significance. Metamorphic Field Gradient –Trend of Thermal Maxima Across Metamorphic Facies.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649cc05503460f94986d59/html5/thumbnails/11.jpg)
Counter Clockwise P-T-t Paths
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Counter-clockwise Path –Commonly Occurs Under Granulite Facies Conditions
![Page 13: P-T-t Paths and Their Significance. Metamorphic Field Gradient –Trend of Thermal Maxima Across Metamorphic Facies.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649cc05503460f94986d59/html5/thumbnails/13.jpg)
Counter clockwise P-T-t Path –Archean Granulite Terrane
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Proterozoic Metamorphism N. Australia
HPLP
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Counter-clockwise Paths in HP and LP Granulite
Terranes
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Clockwise P-T-t Path for Granulite Facies, Scotland
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Variscan Clockwise and Counter-clockwise
Paths in the Odenwald, Germany