P-T-t%20Paths%20and%20Their%20Significance

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P-T-t Paths and Their Significance
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Metamorphic Field Gradient Trend of Thermal
Maxima Across Metamorphic Facies
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Clockwise P-T-t Path
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P-T-t Path Reflecting Crustal Thickening
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A Crustal Thickening P-T-t Path
Central Indian Tectonic Zone (Proterozoic)
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P-T-t Path for Connemara Inlier
Early Barrovian P-T-t Path showing effects of
later arc-related magmatism and variable
uplift/erosion
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P-T-t Path of Burial Metamorphism
Field gradient 25 oC/Km
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Subduction and exhumation in 10 Ma. Prograde,
retrograde stages of a single metamorphic cycle
Alpine orogeny, Rhodope Region, Greece
(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
10 oC/Km
30 oC/Km
SHRIMP U-Pb dating of zircon
Liati and Gebauer, 1999
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Clockwise P-T-t Path in a Back-Arc Basin
ODP Site 976 between Spain and Morocco Miocene
extensional basin
Exhumation in 6 Ma _at_ 4km/Ma
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Alpine Uplift Rates from Geothermobarometry and
40Ar-39Ar Dating
Uplift Rate
20 Ma
mm/an
18 Ma
18 Ma
13.3 Ma
7.1 Ma
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Counter Clockwise P-T-t Paths
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Counter-clockwise Path Commonly Occurs Under
Granulite Facies Conditions
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Counter clockwise P-T-t Path Archean Granulite
Terrane
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Proterozoic Metamorphism N. Australia
HP
LP
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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