The Hadean-Archaean Environment
A sparse geological record combined with physics and molecular phylogeny constrains the environmental conditions on the early Earth. The Earth began hot after the moon-forming impact and cooled to the point where liquid water was present in ∼10 million years Subsequently, a few asteroid impacts may...
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ftpubmed:oai:pubmedcentral.nih.gov:2869525 2023-05-15T16:29:11+02:00 The Hadean-Archaean Environment Sleep, Norman H. 2010-06 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2869525 http://www.ncbi.nlm.nih.gov/pubmed/20516134 https://doi.org/10.1101/cshperspect.a002527 en eng Cold Spring Harbor Laboratory Press http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2869525 http://www.ncbi.nlm.nih.gov/pubmed/20516134 http://dx.doi.org/10.1101/cshperspect.a002527 Copyright © 2010 Cold Spring Harbor Laboratory Press; all rights reserved Perspectives Text 2010 ftpubmed https://doi.org/10.1101/cshperspect.a002527 2013-09-03T00:25:51Z A sparse geological record combined with physics and molecular phylogeny constrains the environmental conditions on the early Earth. The Earth began hot after the moon-forming impact and cooled to the point where liquid water was present in ∼10 million years Subsequently, a few asteroid impacts may have briefly heated surface environments, leaving only thermophile survivors in kilometer-deep rocks. A warm 500 K, 100 bar CO2 greenhouse persisted until subducted oceanic crust sequestered CO2 into the mantle. It is not known whether the Earth's surface lingered in a ∼70°C thermophile environment well into the Archaean or cooled to clement or freezing conditions in the Hadean. Recently discovered ∼4.3 Ga rocks near Hudson Bay may have formed during the warm greenhouse. Alkalic rocks in India indicate carbonate subduction by 4.26 Ga. The presence of 3.8 Ga black shales in Greenland indicates that S-based photosynthesis had evolved in the oceans and likely Fe-based photosynthesis and efficient chemical weathering on land. Overall, mantle derived rocks, especially kimberlites and similar CO2-rich magmas, preserve evidence of subducted upper oceanic crust, ancient surface environments, and biosignatures of photosynthesis. Text Greenland Hudson Bay PubMed Central (PMC) Greenland Hudson Hudson Bay Cold Spring Harbor Perspectives in Biology 2 6 a002527 a002527 |
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Perspectives Sleep, Norman H. The Hadean-Archaean Environment |
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A sparse geological record combined with physics and molecular phylogeny constrains the environmental conditions on the early Earth. The Earth began hot after the moon-forming impact and cooled to the point where liquid water was present in ∼10 million years Subsequently, a few asteroid impacts may have briefly heated surface environments, leaving only thermophile survivors in kilometer-deep rocks. A warm 500 K, 100 bar CO2 greenhouse persisted until subducted oceanic crust sequestered CO2 into the mantle. It is not known whether the Earth's surface lingered in a ∼70°C thermophile environment well into the Archaean or cooled to clement or freezing conditions in the Hadean. Recently discovered ∼4.3 Ga rocks near Hudson Bay may have formed during the warm greenhouse. Alkalic rocks in India indicate carbonate subduction by 4.26 Ga. The presence of 3.8 Ga black shales in Greenland indicates that S-based photosynthesis had evolved in the oceans and likely Fe-based photosynthesis and efficient chemical weathering on land. Overall, mantle derived rocks, especially kimberlites and similar CO2-rich magmas, preserve evidence of subducted upper oceanic crust, ancient surface environments, and biosignatures of photosynthesis. |
format |
Text |
author |
Sleep, Norman H. |
author_facet |
Sleep, Norman H. |
author_sort |
Sleep, Norman H. |
title |
The Hadean-Archaean Environment |
title_short |
The Hadean-Archaean Environment |
title_full |
The Hadean-Archaean Environment |
title_fullStr |
The Hadean-Archaean Environment |
title_full_unstemmed |
The Hadean-Archaean Environment |
title_sort |
hadean-archaean environment |
publisher |
Cold Spring Harbor Laboratory Press |
publishDate |
2010 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2869525 http://www.ncbi.nlm.nih.gov/pubmed/20516134 https://doi.org/10.1101/cshperspect.a002527 |
geographic |
Greenland Hudson Hudson Bay |
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Greenland Hudson Hudson Bay |
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Greenland Hudson Bay |
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Greenland Hudson Bay |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2869525 http://www.ncbi.nlm.nih.gov/pubmed/20516134 http://dx.doi.org/10.1101/cshperspect.a002527 |
op_rights |
Copyright © 2010 Cold Spring Harbor Laboratory Press; all rights reserved |
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https://doi.org/10.1101/cshperspect.a002527 |
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Cold Spring Harbor Perspectives in Biology |
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2 |
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6 |
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