GEOLOGY COLLEGE TEST OUT. PYROXENE Chain silicate Contains Fe, Mg, Si Dark black or dark green augite.

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Presentation transcript:

GEOLOGY COLLEGE TEST OUT

PYROXENE Chain silicate Contains Fe, Mg, Si Dark black or dark green augite

AMPHIBOLE Similar to pyroxene Double chain silicate No green- dark black only Hornblende

porphyry Two different sized crystals Two different rates of cooling phenocryst Porphyritic andestie Porphyritic diorite

OOLITIC LIMESTONE From precipitation of seawater White concretions of CaCO3 fizz

Igneous rocks Clast- made of pieces Clastic- sedimentary –Sandstone, conglomerate, shale Pyroclast(ic)- igneous »Tuff

Lava or pyroclast?

EARTH LAYERS louie/class/plate/composition.html louie/class/plate/composition.html

Earth’s layers Crust- –Continental- feldspar, quartz –Oceanic- pyroxene, plag, olivine Mantle- olivine outer core- liquid iron Inner core- iron

Ocean crust Denser Mafic Thinner Only 200 million years old

How do plates move? Convection currents Slab pull Where does heat come from? –Radioactive decay

Plates

Sea floor spreading Oldest ocean crust= 200 my Polar reversals New crust in center of ridge

Plate boundaries

Pangea

Why wasn’t Wegener’s cont. drift accepted? No seafloor data No earthquake data No mechanism to move plates Convection currents Slab pull Ridge push (thermal plumes)

isostasy is a term used in geology to refer to the state of gravitational equilibrium between the earth's lithosphere and asthenosphere such that the tectonic plates "float" at an elevation which depends on their thickness and densitygeologygravitationalearthlithosphereasthenospheretectonic plates

Accretionary wedge

Magmatic arc

Half life problem If you begin with 80 grams of 14 C after a time, 20 grams are left. How old is the sample? One half life= 14,000 years

Magnitude scale Each step is 10x

Passive plate margins Non- tectonic Continental shelf- slope- rise