Flood basalt - Wikipedia
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. Many flood basalts have been attributed to the onset of a hotspot reaching the surface of the Earth via a mantle plume. [2]
Basalt - Wikipedia
The shape, structure and texture of a basalt is diagnostic of how and where it erupted—for example, whether into the sea, in an explosive cinder eruption or as creeping pāhoehoe lava flows, the classic image of Hawaiian basalt eruptions.
Deccan Traps - Wikipedia
The eruptions occurred over a 600–800,000 year time period between around 66.3 to 65.6 million years ago, spanning the Cretaceous–Paleogene boundary.
Flood Basalt Eruptions: NASA Warns That Some Volcanoes Could …
2022年5月3日 · A new NASA climate simulation suggests that extremely large volcanic eruptions called “flood basalt eruptions” could significantly warm Earth’s climate and devastate the ozone layer that shields life from the Sun’s ultraviolet radiation.
Columbia River Basalt Group Stretches from Oregon to Idaho
2023年12月7日 · Columbia River Basalt Group map shows main regions of basalt exposure in Washington, Oregon, Idaho and Nevada, USA. Flood basalt lava flow in stacked layers viewed eastward across the Columbia River from Rowena Crest Viewpoint, Oregon. Basalt in the lava flows has formed columnar jointing.
NASA Simulation Suggests Some Volcanoes Might Warm …
2022年5月2日 · A new NASA climate simulation suggests that extremely large volcanic eruptions called “flood basalt eruptions” might significantly warm Earth’s climate and devastate the ozone layer that shields life from the Sun’s ultraviolet radiation.
Rapid eruption of the Columbia River flood basalt and ... - AAAS
2018年9月19日 · The Columbia River Basalt Group (CRBG) is the youngest, smallest, and best-preserved continental flood basalt. It erupted ~210,000 km 3 of lava in the Pacific Northwest, United States, between ~17 and 5 million years (Ma) ago. Forty-three distinct stratigraphic members with volume estimates have been defined using regional correlations based on detailed mapping, geochemistry, and paleomagnetic ...
Intrusions induce global warming before continental flood basalt ...
2022年5月9日 · Extinction events are known to correlate with continental flood basalt eruptions. Massive carbon degassing from these eruptions can have catastrophic impacts on the global climate and...
Mega-eruptions linked to most mass extinctions over past 500 …
2022年9月12日 · A new study, led by scientists at Dartmouth College in New Hampshire, concludes that most of these mass extinctions had one thing in common: They occurred after mega-eruptions that spewed volcanic lava and toxic gases for hundreds of thousands of years, and some for as long as a million years.
Flood Basalts | Volcano World | Oregon State University
Flood Basalts. Flood basalts are yet another strange type of "volcano." Some parts of the world are covered by thousands of square kilometers of thick basalt lava flows - individual flows may be more than 50 meters thick, and individual flows extend for hundreds of kilometers.
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