SIO 50 Lecture Notes - Lecture 7: Intermediate Composition, Volcanic Gas, Mount Pinatubo

• School: UCSD
• Department: Scripps Institution of Oceanography
• Course: SIO 50
• Professor: Geoffrey Cook

Document Summary

Oxygen-poor, reducing environment bc it won"t rot very quickly so it"s more likely to be preserved. Abundance of dissolved minerals for replacement (sio2 source= volcanic ash) All different kinds of fossils, index fossils are formed and readily identifiable fossils. Permineralization- replacement that preserves internal structures (cells and pores) Pseudomorphism- replacement that preserves the external form, but ot the internal detail (most common) tracks, trails, imprints. Most of the time it is silica materials. Petrification is the process in which organic matter is converted to stony matter. Usually it involves water and some kind of sio2. They"re kind of dangerous and in recent decades has the most death toll. Slurry of concrete (takes much less depth to take you out) Distribution of ash that has reach vermont and main. Relatively small eruption relative to its size. Breathing in ash is probably not a really smart idea. Now has a tiny vertical magma chamber coming up.