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P-T-t Paths and Their Significance
Metamorphic Field Gradient –Trend of Thermal Maxima Across Metamorphic Facies
Clockwise P-T-t Path
P-T-t Path Reflecting Crustal Thickening
A Crustal Thickening P-T-t Path Central Indian Tectonic Zone (Proterozoic)
Early Barrovian P-T-t Path showing effects of later arc-related magmatism and variable uplift/erosion P-T-t Path for Connemara Inlier
P-T-t Path of Burial Metamorphism Field gradient 25 o C/Km
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, o C/Km 30 o C/Km
Clockwise P-T-t Path in a Back-Arc Basin ODP Site 976 between Spain and Morocco – Miocene extensional basin Exhumation in 6 4km/Ma
Alpine Uplift Rates from Geothermobarometry and 40 Ar- 39 Ar Dating mm/an 20 Ma 18 Ma 13.3 Ma 7.1 Ma Uplift Rate
Counter Clockwise P-T-t Paths
Counter-clockwise Path –Commonly Occurs Under Granulite Facies Conditions
Counter clockwise P-T-t Path – Archean Granulite Terrane
Proterozoic Metamorphism N. Australia HP LP
Counter-clockwise Paths in HP and LP Granulite Terranes
Clockwise P-T-t Path for Granulite Facies, Scotland
Variscan Clockwise and Counter-clockwise Paths in the Odenwald, Germany
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