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Picryl description: Public domain image, drawing, American, 19th century, free to use, no copyright restrictions

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Greater Pacific Northwest—Three Types of Plate Boundaries and a Hotspot

description

Summary

The Yellowstone Hotspot track is superimposed on other tectonic provinces of the Pacific Northwest. The hotspot first surfaced 17 million years ago as massive outpourings of fluid basalt lava in the Columbia Plateau and Steens Basalt region. Surfacing of the hotspot was affected by subduction that is now manifest as the Cascadia Subduction Zone where the Juan de Fuca Plate descends beneath the edge of the continent. Since then the North American Plate has been moving west-southwest over the hotspot, so that a chain of explosive rhyolite volcanic centers (pink blobs) extends across the Snake River Plain to Yellowstone. This line of supervolcanoes is concurrent with continental rifting forming the Basin and Range Province.

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Tags

plate tectonics geology geologic resources division greater pacific northwest three types plate boundaries hotspot yellowstone hotspot track hotspot first fluid basalt lava steens basalt region cascadia subduction zone north american plate tectonic provinces range province fuca plate snake river plain national parks gallery ultra high resolution high resolution wyoming yellowstone national park
date_range

Date

2020
create

Source

National Parks Gallery
link

Link

https://npgallery.nps.gov/
copyright

Copyright info

Public Domain Dedication

label_outline Explore Range Province, Yellowstone Hotspot Track, North American Plate

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Topics

plate tectonics geology geologic resources division greater pacific northwest three types plate boundaries hotspot yellowstone hotspot track hotspot first fluid basalt lava steens basalt region cascadia subduction zone north american plate tectonic provinces range province fuca plate snake river plain national parks gallery ultra high resolution high resolution wyoming yellowstone national park