Hadean - Wikipedia
The Hadean (/ h eɪ ˈ d iː ə n, ˈ h eɪ d i ə n / hay-DEE-ən, HAY-dee-ən) is the first and oldest of the four known geologic eons of Earth's history, starting with the planet's formation about 4.6 billion years ago [4] [5] (estimated 4567.30 ± 0.16 million years ago [2] set by the age of the oldest solid material in the Solar System ...
Hadean Eon | Start, Timeline, & Facts | Britannica
2024年10月8日 · Hadean Eon, informal division of the Precambrian occurring between about 4.6 billion and about 4.0 billion years ago. It was the time of Earth’s initial formation—the accretion of dust and gases, collisions with larger bodies, the stabilization of its core and crust, and the rise of its atmosphere and oceans.
Hadean Eon: The Formation of Earth (4.6 to 4.0 billion years ago)
From 4.6 to 4.0 billion years ago, the Hadean Eon is the first eon on Earth. Its key events are: HEAT SOURCE: Earth established a heat source with the sun. MAGNETIC FIELD: Convection currents produced a geodynamo. This was the first step for life to persist on Earth. MOON FORMATION: The formation of our moon was key to stabilizing our climate.
2.3: Hadean Eon - Geosciences LibreTexts
2024年4月11日 · The Hadean Eon, named after the Greek god and ruler of the underworld Hades, is the oldest eon and dates from 4.5–4.0 billion years ago. Figure \(\PageIndex{2}\): Artist’s impression of the Earth in the Hadean.
8.1: Hadean Eon - Geosciences LibreTexts
2024年9月23日 · The Hadean Eon, named after the Greek god and ruler of the underworld Hades, is the oldest eon and dates from 4.5–4.0 billion years ago. This time represents Earth’s earliest history, during which the planet was characterized by a partially molten surface, volcanism, and asteroid impacts.
Hadean Earth - SpringerLink
2020年6月20日 · This book consolidates the latest research on the Hadean Eon - the first 500 million years of Earth history - which has permitted hypotheses of early Earth evolution to be tested, including geophysical models that include the possibility of plate tectonic-like behavior.
10.1: The Hadean Eon (4600-4000 Ma) - Geosciences LibreTexts
2024年8月24日 · The Hadean Eon, named after the Greek god and ruler of the underworld, Hades, is the oldest eon and dates from 4.6-4.0 billion years ago. This time represents Earth’s earliest history, during which the planet was characterized by a partially molten surface, volcanism, and asteroid impacts.
Impact Cratering on the Hadean Earth - Lunar and Planetary …
A video of a rotating, impact-scarred Hadean Earth. This is an artistic reconstruction that illustrates land masses, mountain ranges, and seas shaped by impact cratering events, some of which significantly heated portions of the surface.
Hadean Earth and primordial continents: The cradle of …
2017年3月1日 · Earth's Hadean continents were destroyed and deep subducted through strong mantle convection. Primitive continent-lake-atmosphere system in Hadean set the cradle of prebiotitic life on Earth. The Hadean history of Earth is shrouded in mystery and it is considered that the planet was born dry with no water or atmosphere.
Impact-driven subduction on the Hadean Earth - Nature
2017年9月25日 · Here we conduct global-scale tectonic simulations of the evolution of the Earth through the Hadean eon under variable impact fluxes. Our simulations show that the thermal anomalies produced by...
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