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Download Introduction to Metamorphic Petrology Recommended Textbook: J.D. Winter (2001) An Introduction to Igneous and Metamorphic Petrology: Prentice Hall Pub

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  • Slide 1
  • Introduction to Metamorphic Petrology Recommended Textbook: J.D. Winter (2001) An Introduction to Igneous and Metamorphic Petrology: Prentice Hall Pub.
  • Slide 2
  • Scope of Metamorphic petrology Metamorphic petrology is the study of the subsolidus changes that a rock undergoes when exposed to physicochemical conditions different from those prevailing near the surface of the Earth. Metamorphism produces changes in mineral assemblages and textures that reflect re-equilibration of the rock to the new physicochemical conditions, i.e., minimization of the energy of the system. Metamorphism is commonly isochemical (except for volatile components, e.g., H 2 O, CO 2 ). Where the system is open, the process is referred to as metasomatism.
  • Slide 3
  • Metamorphic Reactions Dehydration KAl 3 Si 3 O 10 (OH) 2 + SiO 2 = KAlSi 3 O 8 + AlSi 2 O 5 + H 2 O Decarbonation CaCO 3 + SiO 2 = CaSiO 3 + CO 2 Calcite Quartz Wollastonite Muscovite Quartz K-Feldspar Sillimanite Solid-Solid NaAlSi 3 O 8 = NaAlSi 2 O 6 + SiO 2 Albite Jadeite Quartz
  • Slide 4
  • Prograde and Retrograde Metamorphism Prograde Path Retrograde Path
  • Slide 5
  • Metamorphic Facies A metamorphic facies is a domain of Pressure-Temperature Space Metamorphic facies are defined by characteristic mineral assemblages specific to particular bulk-rock compositions
  • Slide 6
  • Conditions of Metamorphism and Metamorphic Facies
  • Slide 7
  • Contact or Thermal Metamorphism Regional Metamorphism Orogenic Metamorphism Orogenic Metamorphism Burial Metamorphism Burial Metamorphism Ocean Floor Metamorphism Ocean Floor Metamorphism Hydrothermal Metamorphism (Alteration) Impact or Shock Metamorphism Types of Metamorphism
  • Slide 8
  • Contact or Thermal Metamorphism
  • Slide 9
  • Contact Metamorphism of Limestone Diabase Marble Limestone Marble Limestone
  • Slide 10
  • Pyroxene Plagioclase Garnet Thermally Metamorphosed Clastic Sediments
  • Slide 11
  • Orogenic Metamorphism
  • Slide 12
  • Slide 13
  • Orogenic Metamorphism and differential stress 1 > 2 = 3 foliation and no lineation 1 = 2 > 3 lineation and no foliation 1 > 2 > 3 both foliation and lineation 11 Foliation (or Cleavage) and Lineation
  • Slide 14
  • Cleavage Bedding Onset of Orogenic Metamorphism Shale Slate Bedding
  • Slide 15
  • Phyllite Schist Progressive Orogenic Metamorphism
  • Slide 16
  • Gneiss
  • Slide 17
  • Anatexis
  • Slide 18
  • Anatexis or Partial Melting of Metasedimentary Rocks (Migmatites)
  • Slide 19
  • Burial Metamorphism
  • Slide 20
  • Slide 21
  • Subduction Metamorphism
  • Slide 22
  • Paired Metamorphic Belts Blueschist Facies Amphibolite Facies
  • Slide 23
  • Subduction Metamorphism
  • Slide 24
  • Ocean Floor Metamorphism
  • Slide 25
  • Slide 26
  • Metamorphic Isograd Mapping (Index Minerals)
  • Slide 27
  • Metamorphic Index Minerals (Porphyroblasts) Staurolite (Fe,Mg) 2 Al 9 Si 4 O 23 (OH) Garnet (Fe,Mg) 3 Al 2 Si 3 O 12 Cordierite (Mg,Fe) 2 Al 4 Si 5 O 18
  • Slide 28
  • The Aluminosilicates Al 2 SiO 5 Andalusite Kyanite Sillimanite
  • Slide 29
  • Metamorphic Isograds and P-T Paths Barrow Zones Buchan Zones
  • Slide 30
  • Aluminosilcates as Indicators of Metamorphic Grade
  • Slide 31
  • Metamorphic reactions and metamorphic grade Muscovite + Quartz = K-feldspar + sillimanite + H 2 O Sillimanite Quartz K-feldspar Muscovite
  • Slide 32
  • Oslo: K-Feldspar- Cordierite Orijrvi: Biotite-muscovite 2 KMg 3 AlSi 3 O 10 (OH) 2 + 6 KAl 2 AlSi 3 O 10 (OH) 2 (Ms) + 15 SiO 2 = 3 Mg 2 Al 4 Si 5 O 18 + 8 KAlSi 3 O 8 + 8 H 2 O Metamorphic Facies and Isograds
  • Slide 33
  • Facies Series
  • Slide 34
  • Pressure-Temperature-Time Paths

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