EESA06H3 Lecture Notes - Lecture 4: Continental Crust, Rhyolite, Mid-Ocean Ridge
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. 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. Transform faults: enable sea floor spreading on a spherical surface. Rejyjanes ridge where the mid-atlantic ridge come onshore in iceland. Basalt and gabbro (more course grained cools slow) Mantal ploom feeding hot rock (orange triangle) Shield volcano gentle slopes; between 2-10" the. Hawaiian example rise 10 km from the sea floor. Magma chamber hot rock is being melted. Peridotite plastic, hot, begins to melt as it goes up magma chamber. Acidic rocks granite rhyolite, diorite andesite, gabbro basalt (dangerous magma) Alibeem green mineral (peridot) mantle is made out of this.
