| 词条 | Yellowstone Plateau |
| 释义 |
The Yellowstone Plateau volcanic field is a geological feature found in the U.S. state of Wyoming. It is a popular site for tourists. The plateau developed through three volcanic cycles spanning two million years that included some of the world's largest known eruptions. Eruption of the >{{convert|2500|sqkm|abbr=on}} Huckleberry Ridge Tuff about 2 million years ago created the more than {{convert|75|km|abbr=on}} long Island Park Caldera. The second cycle concluded with the eruption of the Mesa Falls Tuff around 1.3 million years ago, forming the {{convert|25|km|abbr=on}} wide Henry's Fork Caldera at the western end of the first caldera. Activity subsequently shifted to the present Yellowstone Plateau and culminated 630,000 years ago with the eruption of the {{convert|1000|sqkm|abbr=on}} Lava Creek Tuff and the formation of the present {{convert|45|x|75|km|abbr=on}} caldera. Resurgent doming then occurred at both the NE and SW sides of the caldera and voluminous {{convert|1000|sqkm|abbr=on}} intracaldera rhyolitic lava flows were erupted between 150,000 and 70,000 years ago. Phreatic eruptions produced local tephras during the early Holocene. The caldera presently contains one of the world's largest hydrothermal systems including the world's largest concentration of geysers.[1] Much of the plateau is located within Yellowstone National Park. References1. ^{{cite web | url = http://volcanoes.usgs.gov/yvo/history.html | title = Volcanic History of the Yellowstone Plateau Volcanic Field| work = | publisher = U.S. Geological Survey | accessdate = 2007-02-18}} {{coord|44.471031|-110.501862|display=title}}{{Wyoming-geo-stub}} 5 : Landforms of Yellowstone National Park|Volcanic plateaus|Geology of Wyoming|Plateaus of the United States|Volcanic fields of Wyoming |
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