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zankaon
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What would it be like if a 300 km diameter meteorite hit the early (first 1 Byrs) Archean surface?
Hint: a smaller impact on Kilawea surface in Hawaii.
Hint: a smaller impact on Kilawea surface in Hawaii.
Correlation of Earth's oldest documented impact layer between the EPB of Western Australia and the BGB of South Africa is consistent with our previous work indicating that these early Archean impacts were very large: 10 to 100 times more massive than the Cretaceous-Tertiary event, producing unusual impact-generated tsumanis (3, 7, 14, 16). This report confirms the global nature of these massive fallout layers, suggests that an early terrestrial record of large asteroidal impacts does exist, and may provide important constraints on the evolution of Earth's geological and biological systems.
zankaon said:What would it be like if a 300 km diameter meteorite hit the early (first 1 Byrs) Archean surface?
Hint: a smaller impact on Kilawea surface in Hawaii.
zankaon said:such Archean surface (not crust) would have no silicates, since anoxic environment. so seemingly not much ejected material into atmosphere.
zankaon said:such Archean surface (not crust) would have no silicates, since anoxic environment. so seemingly not much ejected material into atmosphere. So except for direct hit, seemingly not much of a geological effect?
zankaon said:Such shallow Archean sea impact would vaporize impacted water, which is compressable, as well as extruded into atmosphere. Hence wouldn't there seem to result in an inflow of surrounding waters into vaporized volume of water? Perhaps after any outgoing wave.
The 300km meteorite impact on early Earth's surface was caused by a large object, likely an asteroid or comet, colliding with the Earth at a high velocity.
The 300km meteorite impact is estimated to have occurred around 3.26 billion years ago during the Archean Eon. This is based on geological evidence and radiometric dating of impact debris.
The 300km meteorite impact had significant consequences for early Earth. It created a large crater and caused massive earthquakes, tsunamis, and volcanic eruptions. It also released a tremendous amount of energy and heat, altering Earth's climate and atmosphere.
Yes, the 300km meteorite impact had long-term effects on early Earth's surface. It led to the formation of new minerals, including diamonds, and helped to trigger the evolution of early life forms.
Yes, we can still see evidence of the 300km meteorite impact on early Earth's surface today. The impact crater, known as the Vredefort Dome, is located in South Africa and is a UNESCO World Heritage Site. Additionally, rocks and minerals from the impact have been found in various locations around the world.