Lecture notes from the Live lecture

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21 Mar 2011
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Lecture 7
๎€Guyots: (named after an oceanographer) A f lat topped dead volcano
๎€hot spots are usually associated with hot spot islands in the middle of oceans. Someone in the
60's asked why there was islands in the middle of the oceans, which is why we know about hot
spots
๎€On the islands the rocks are much younger than the sur rounding ocean f loor.
๎€The youngest island which is brand new (right above a hot spot)
๎€There is a systematic aging of the rocks as you move away from the hot spots and move down
the trail.
๎€The orientation of the hot spot trail gives the direction for t he plate movement.
๎€Bathymetric- a map that shows water depths
๎€Phreatomagmatic means to do with water, water will go down and hit the magma and create
steam, this leads to pyroclastic eruptions.
๎€Pyroclastic ask- ask thats thrown up in the air and falls onto t he land, or blows out onto the
water. The successive f lows build up laminated sediment layers.
๎€Cinder cone- ??
๎€Scor ia are large cinder pieces of ash
๎€Trace fossil: the track t hat an organism leaves.
๎€Predation means to eat s omething.
๎€Feral means w ild. In the Galapagos there was feral cats.
๎€There are igneous rock that gets extruded and int ruded
๎€Both igneous and sedimentary rocks can change. The new rock which is called metamorphic
rock is completely different from the original rock. These are the 3 groups of rocks found on
earth.
๎€The rock cycle only operates if there is plate tectonics and plate tectonics only occurs if there is
heat.
๎€Lithification- tur ns sediment into rock
๎€compaction- squeezing water and air out of something
๎€A rock is a naturally formed consolidation material composed of grains of one or more minerals
๎€A mineral is a naturally occur ring inorganic crystalline solid that has a definite chemical
composition, they are the building blocks of rocks.
๎€Crystallography- the study of dif ferent shapes of crystals, and the different mineral types.
๎€There are 4500 different types of minerals
๎€The most impor tant group are the silicate minerals containing silicon and oxygen and ac counts
for 90% of all minerals. A few minerals dominate such as Quartz( silica=SiO2=sil icon plus
oxygen), olivine, feldspars, pyroxenes, mica, clay minerals such as kaolinite, montmor illonite.
๎€Feldspars are the largest g roup (field crystals) they are found in a lot of different colours. They
are semi precious and can be polished into jewel lery.
๎€Quartz is the key mineral that thickens the magma. There is very little Quartz in basalt.
๎€Basic rocks lack silica
๎€Acidic rocks have much higher content of Quartz (Granite, andesite)
๎€We identify minerals by s hape, colour(most noticable but least accurate), streak (colour when
mineral ground to a find powder on a streak plate like hematite (redish-brown), sili cate minerals
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Document Summary

guyots: (named after an oceanographer) a flat topped dead volcano hot spots are usually associated with hot spot islands in the middle of oceans. 60"s asked why there was islands in the middle of the oceans, which is why we know about hot spots. on the islands the rocks are much younger than the surrounding ocean floor. the youngest island which is brand new (right above a hot spot) there is a systematic aging of the rocks as you move away from the hot spots and move down the trail. the orientation of the hot spot trail gives the direction for the plate movement. bathymetric- a map that shows water depths. phreatomagmatic means to do with water, water will go down and hit the magma and create steam, this leads to pyroclastic eruptions.

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