EPSC 201 Lecture 26: 11-EPSC-Lecture-Notes
20 Jul 2016
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Identified by concentrations of earthquakes o associated with many other dynamic phenomena: plate interiors are almost earthquake free, tectonic plates: o display a variety of sizes and shapes o change size and shape throughout their history, three types: o divergent boundary tectonic plates move apart ( ) Convergent margins: oceanic oceanic, oceanic continental, continental continental o transform boundary tectonic plates slide sideways. Continental lithosphere can break apart o lithosphere stretches and thins o brittle upper crust faults o ductile lower crust flows o asthenosphere rises and melts o magma erupts. Western u. s basin and range province is a rift o narrow north south mountains separated by basins o rifting titled blocks of crust to form mountains o sediment eroded from blocks, filling adjacent basins. Black smokers are found at some mors o water entering fractured rock is heated by magma o hot water dissolves minerals and cycles back out of rock o when water reaches the sea, minerals precipitate quickly.
