PPT-1 Petrology Lecture 9

Introduction to Metamorphism GLY 4310 Spring 2016 2 Metamorphism Definition The mineralogical chemical and structural adjustment of solid rocks to physical and chemical conditions which differ from the conditions under which the rocks in question originated from the Glossary of geology 2nd edition . Gautam Sen. Plates & Mid-oceanic Ridges. Types of Spreading Center. Ridge offset by a. Transform fault. Overlapping . Spreading Center. Continuous Ridge. Axis with a small. bend. Relief map of EPR. &#x/MCI; 0 ;&#x/MCI; 0 ;Humphries D.J., Biggar G.M and O’Hara M.J. (1972) Phase equilibria and origin of Apollo 15 basalts etc. . 103-107. Lunar Planetary Institute, Ehmann EarthEarth Oceanic Intraplate Volcanism. GLY 4310 - Spring, 2016. 2. Hot Spots, Trails, and . Aseismic Ridges. Figure 14.1. . Map of relatively well-established hotspots and selected hotspot trails (island chains or aseismic ridges). Hotspots and trails from Crough (1983) with selected more recent hotspots from Anderson and Schramm (2005). Also shown are the geoid anomaly contours of Crough and Jurdy (1980, in meters). Note the preponderance of hotspots in the two major geoid highs (superswells).. Gautam Sen. Flood Basalts & Hot Spot Tracks. “Plume Heads & Tail” Model. Central Atlantic Magmatic Province (CAMP). Flood Basalts & Mass Extinctions. Columbia River Basalt. FeO* & TiO. of Metamorphic Petrology Data. Patrick West. 1 (. westp@. rpi.edu. ). , . Peter Fox. 1(. pfox@cs.rpi.edu. ). , Frank Spear. 2. (. spearf@rpi.edu. ). ,. Sibel. Adali. 3. (. sibel@cs.rpi.edu. ). , Cam Le Nguyen. Igneous Structures and . Field Relationships. GLY 4310 - Spring, 2016. 2. Viscosity and Temperature. Anhydrous rhyolitic magma . 1400. °. C - 10. 5. poise. 1000. °. C - 10. 8. poise. 3. Viscosity and Composition. granitoids. of the northern part of Adamawa Massif, N.E Nigeria. I.V. . . Haruna. Department of Geology. Modibbo. . Adama. University of Technology, . Yola. - Nigeria. ORDER OF PRESENTATION. Introduction. Mid-Ocean Ridge Volcanism. GLY 4310 - Spring, 2016. 2. MOR System. 3. MOR Spreading Rates. 4. Oceanic Crust Cross-Section. Figure 13-5 . Modified after Brown and . Mussett. (1993) . The Inaccessible Earth: An Integrated View of Its Structure and Composition. Chapman & Hall. London.. Mid-Ocean Ridge Volcanism. GLY 4310 - Spring, 2017. 2. MOR System. 3. MOR Spreading Rates. 4. Oceanic Crust Cross-Section. Figure 13-5 . Modified after Brown and . Mussett. (1993) . The Inaccessible Earth: An Integrated View of Its Structure and Composition. Chapman & Hall. London.. Introduction to Metamorphism. GLY 4310 - Spring, 2017. 2. Metamorphism Definition. “The mineralogical, chemical, and structural adjustment of solid rocks to physical and chemical conditions which differ from the conditions under which the rocks in question originated” (from the Glossary of geology, 2nd edition) . Igneous Structures and . Field Relationships. GLY 4310 - Spring, 2017. 2. Viscosity and Temperature. Anhydrous rhyolitic magma . 1400. °. C - 10. 5. poise. 1000. °. C - 10. 8. poise. 3. Viscosity and Composition. GLY 4310 - Spring, 2018. 2. Hot Spots, Trails, and . Aseismic Ridges. Figure 14.1. . Map of relatively well-established hotspots and selected hotspot trails (island chains or aseismic ridges). Hotspots and trails from Crough (1983) with selected more recent hotspots from Anderson and Schramm (2005). Also shown are the geoid anomaly contours of Crough and Jurdy (1980, in meters). Note the preponderance of hotspots in the two major geoid highs (superswells).. GLY 4310 - Spring, 2019. 2. Alternative Assemblages, Oslo. MgSiO. 3. + CaAl. 2. Si. 2. O. 8. = CaMgSi. 2. O. 6. + Al. 2. SiO. 5. . . En. + An = Di + And.