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55 Golden Wind Fields
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Posted By: Hal Brown
Date Posted: Sep 14, 2008
Description: Out east of the Cascade Mountains is the great Columbia Plateau. It is one of the world’s largest and most spectacular volcanic provinces. (It’s not really a plateau. It’s a basin.) You won’t see volcanic cones on the plateau. You will see massive flows of lava.

Floods of basalt over millions of year spilled out of huge volcanic center in southeastern Washington and Oregon. It flowed into the mountain valleys of eastern Idaho. It flowed north to the mountains of northeastern Washington, and west to the edge of the North Cascade subcontinent. It spilled through the old Columbia River valley beneath Mount Hood and all the way to the Pacific. Great pools of molten basalt hundreds of feet deep covered thousands of square miles. The earth bled black basalt. What a spectacle that must have been!

Such outpourings of basalt can be catastrophic for the planet. The “Great Dying” that occurred at the boundary of the Permian and Triassic periods could have been associated with the Siberian Traps. The Siberian Traps formed when the largest basalt flow let loose covering some 77,000 square miles.

About that time 96% of marine species and 70% of terrestrial species died. The basalt flows may have been only a factor, releasing ash and acid that would have blocked out the sun. The massive quantities of carbon dioxide that could have been released may have warmed the world enough to liberate methane hydrates from their storage on the sea floors, radically altering the atmosphere. Whatever happened, massive lava flows were not a good thing for living things.

Date Taken: Sep 14, 2008
Place Taken: Near Wishram, WA
Owner: Dan Nickens
File Name: 54_Basaltic_Basin.jpg   - Photo HTML
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Category: 329, Taking Peli Home
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