Hadean


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Related to Hadean: Archean

Hadean

[′hā·dē·ən]
(geology)
The period (more than 3800 million years ago) extending for several hundred millions of years from the end of the accretion of the earth to the formation of the oldest recognized rocks.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Paper's lead author Simone Marchi said that the new picture of the Hadean Earth emerging from this work has important implications for its habitability.
That Late Heavy Bombardment melted most of Earth's surface rocks, erasing most terrestrial evidence of the Hadean epoch.
And this hadean Arcady is often the domain of death, where the middle class goes to die.
The study, titled "Potassic, high-silica Hadean crust," was published June 4 in the (http://www.pnas.org/content/early/2018/05/30/1720880115) journal PNAS.
Elemental nature has lost its elan vital, is reduced to a denatured Hadean shadow.
From Earth's origin some 4.6 billion years ago until 3.8 billion years ago, the planet was such a hellish place that geologists call this eon the Hadean after Hades, the Greek god of the underworld.
Washington, Nov 26 ( ANI ): A new analysis of Hadean mineralogy challenges the assumption that the mineral species found on Earth today are much the same as they were during Earth's first 550 million years-the Hadean Eon-when life emerged.
As so well demonstrated by the Moon's thoroughly cratered surface, Earth was impacted as much as any other planet, especially in the period before 3.8 Ga during the elusive Hadean times.
His ninth book of poetry, Hadean Eclogues, will be published by Story Line Press next year.
Awakened to both the memory and the extent of the loss, young artists and poets see the new world with ancient eyes, revealed in an amazing, brilliant light; contemporary America transformed in the language of the Orphic lyre, the cities and suburbs come alive in all their strange, Hadean, Arcadian grotesqueness and beauty.
When the meteorites from the Hadean period, between 4 billion and 4.56 billion years ago, pummeled young Earth and caused subduction, "this would have effectively recycled large portions of the Earth's surface, drastically changing the geography of the planet," lead study author Craig O'Neill said in a statement from (http://www.mq.edu.au/newsroom/2017/09/26/large-meteorite-impacts-drove-plate-tectonic-processes-on-the-early-earth/) Macquarie University.
Judith Coggon at the University of Bonn, Germany, said that the first 600 million years of Earth are called the Hadean, as it was previously believed that at this period of the time, Earth was hellish and uninhabitable.