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Yellow stone flood basalts1/8/2024 ![]() Helens through much larger than the 1991 Mount Pinatubo eruption. Because of their geometry and age distributions. Such eruptions could range in size from smaller than the 1980 eruption of Mt. Yellowstone-Snake River Plain province, and the volcanic platform and ridge system centered on Iceland. If rhyolitic lava flows do erupt, they could also include explosive phases that might produce significant volumes of volcanic ash and pumice. Earlier this month, Death Valley, in a severe drought, got a near record amount of rainfall in one day, causing floods, and is still in a nasty drought. Many flood basalts have been attributed to the onset of a hotspot reaching the surface of the earth via a mantle plume. The same thing happened in Yellowstone in June. An eruption of lava could cause widespread havoc in the park, including fires and the loss of roads and facilities, but more distant areas would probably remain largely unaffected. A flood basalt (or plateau basalt 1) is the result of a giant volcanic eruption or series of eruptions that covers large stretches of land or the ocean floor with basalt lava. During eruption, these flows oozed slowly over the surface, moving at most a few hundred feet per day for several months to several years, destroying everything in their paths. These extensive rhyolite lavas are very large and thick, and some cover as much as 340 km 2 (130 mi 2), twice the area of Washington, D.C. Other flows of rhyolite and basalt (a more fluid variety of lava) also have been extruded outside the caldera.Įach day, visitors to the park drive and hike across the lavas that fill the caldera, most of which were erupted since 160,000 years ago, some as recently as about 70,000 years ago. Since Yellowstone’s last caldera-forming eruption 640,000 years ago, about 30 eruptions of rhyolitic lava flows have nearly filled the Yellowstone Caldera. These would be significant and produce flows with volumes greater than 1 km 3, but all of these would most certainly remain within the boundary of Yellowstone National Park. Flow dated at 72,000 years erupted as a single event, others were likely formed from multiple eruptions. This mantle plume released a massive amount.4 answers Top answer: Conventional wisdom is that they must, as another answer said, have a causal relationship. Around 17 million years ago a mantle plume reached the crust. Map of post-caldera lava flows from Yellowstone volcano. Yes, they were both formed by the same geologic event.
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