EESA06H3 Lecture Notes - Lecture 4: Shield Volcano, Peridotite, Viscosity
Document Summary
Read chap 1-4: mid ocean ridges modern and ancient (ophiolites, transform faults. Iceland: walking over a mid- ocean ridge: volcanic activity under glaciers: jokulhlaups, geothermal energy. Continuous cooling of margins of magma chamber and continuous of new magma at centre. How ocean widen continuous intrusion of dikes at. Layers (7 km) of oceanic crust (vertical columns: marine sediment (pillow basalt, sheeted dikes, gabbro intrusions, ultramafic rock (magnesium + ion) Mass flows where settlements slump down the slope, triggered by earthquakes. Ophiolites fossil ocean crust preserved on land. Transform faults: enable sea floor spreading on a spherical surface: lapetus ocean. Segment ridge: sediment deposition on newly formed continental margin, ocloser of lapetus ocean. Terrains sliver continental crust: lapetus ocean floor thrust onto north amer. Basalt and gabbro (more course grained cools slow) Mantal ploom feeding hot rock (orange triangle) Magma chamber hot rock is being melted. Peridotite plastic, hot, begins to melt as it goes up magma chamber.
