The Columbia Plateau: A Land of Many Floods Olivia Miller & Morgan Rosenberg.

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Presentation transcript:

The Columbia Plateau: A Land of Many Floods Olivia Miller & Morgan Rosenberg

Miocene -Pliocene (17-6 Ma) 174,000 km 3 basalt 300+ flows 1.8 km thick

rks/province/ColumbiaRelief.j pg n.edu/EPIC/Geologic/Missoul a/thumbnails/ n.edu/EPIC/Geologic/Missoul a/thumbnails/46.EP_0187_DR _MF_46.jpg y/online_books/geology/publ ications/inf/72-2/sec5.htm Dry Falls

Crust & Lithosphere Properties Columbia Arc (Blue Mtns.) divides the Columbia Plateau into regions of lower elevation to the north and higher elevation to the south Crustal thickness: Within Plateau: ~ 25 km Around arc/ borders: to 30 km P-wave velocity: 8.1 km/s beneath plateau N of arc 7.8 – 8 km/s S of arc Heat flow high relative to avg. continental crust, but central portion of plateau has region of low heat flow relative to surrounding regions (< 1.5 heat flow units) Crustal Density using Gardner’s Relationship (ρ =.23 V p.25 ) N of arc: 2.94 g/cm 3 S of arc: 2.91 g/cm 3

W/AGU-T106/CRBG_stratigraphic.html Fossil soil layer Erosional unconformities