Results 101 to 110 of about 2,064 (153)
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A Neoproterozoic Snowball Earth
Science, 1998Negative carbon isotope anomalies in carbonate rocks bracketing Neoproterozoic glacial deposits in Namibia, combined with estimates of thermal subsidence history, suggest that biological productivity in the surface ocean collapsed for millions of years.
, Hoffman +3 more
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Toward the snowball earth deglaciation…
Climate Dynamics, 2010The current state of knowledge suggests that the Neoproterozoic snowball Earth is far from deglaciation even at 0.2 bars of CO2. Since understanding the termination of the fully ice-covered state is essential to sustain, or not, the snowball Earth theory, we used an Atmospheric General Climate Model (AGCM) to explore some key factors which could induce
Le Hir, Guillaume +3 more
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Science, 2000
In his News Focus article “An appealing snowball Earth that's still hard to swallow” (10 Mar., p. [1734][1]), Richard A. Kerr provides an update on the “snowball Earth” hypothesis ([1][2]), which proposes that around 600 and 2400 million years ago in the Proterozoic era there were ...
Warwick F. Vincent +1 more
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In his News Focus article “An appealing snowball Earth that's still hard to swallow” (10 Mar., p. [1734][1]), Richard A. Kerr provides an update on the “snowball Earth” hypothesis ([1][2]), which proposes that around 600 and 2400 million years ago in the Proterozoic era there were ...
Warwick F. Vincent +1 more
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Science, 1998
In their article “A Neoproterozoic snowball Earth” (Reports, 28 Aug., p. [1342][1]), Paul F. Hoffman et al. report that global ice-house conditions existed during the Proterozoic, as inferred from negative carbon isotopes in carbonate rocks from Namibia.
Gregory S. Jenkins +1 more
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In their article “A Neoproterozoic snowball Earth” (Reports, 28 Aug., p. [1342][1]), Paul F. Hoffman et al. report that global ice-house conditions existed during the Proterozoic, as inferred from negative carbon isotopes in carbonate rocks from Namibia.
Gregory S. Jenkins +1 more
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2012
Our attempts to reconstruct the climate of the distant Archaean in Chapter 1 might seem a little like reading a volume of Tolstoy’s War and Peace recovered from a burnt-out house. Most of the pages have turned to ash, and only some scattered sentences remain on a few charred pages.
Jan Zalasiewicz, Mark Williams
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Our attempts to reconstruct the climate of the distant Archaean in Chapter 1 might seem a little like reading a volume of Tolstoy’s War and Peace recovered from a burnt-out house. Most of the pages have turned to ash, and only some scattered sentences remain on a few charred pages.
Jan Zalasiewicz, Mark Williams
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Sedimentary challenge to Snowball Earth
Nature Geoscience, 2008Evidence from the magnetic field fossilized in sedimentary rocks suggests that, more than 600 million years ago, ice occupied tropical latitudes. A popular explanation for these findings, the Snowball Earth concept, envisages a fully frozen Earth for millions of years, caused by a runaway ice–albedo feedback. A rapid, catastrophic meltback at very high
Philip A. Allen, James L. Etienne
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From Snowball to Phaneorozic Earth
International Geology Review, 2005The so-called Late Proterozoic snowball Earth disappeared at the beginning of Phanerozoic time: the surface of the Phanerozoic Earth was enveloped by an ocean and oxygen-rich atmosphere, and the planet had a warm climate. We propose that this dramatic change resulted from the return flow of seawater into the mantle beginning at 750 Ma, as a consequence
S. Maruyama, J. G. Liou
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Scientific American, 2011
The article discusses research by biogeochemists at the University of California, Riverside, investigating the link between the glacial runoff and the rapid evolution of animal life. Topics include the research methodology the team used to calculate the phosphorus concentrations of oceans one billion years ago, which is a key nutrient in biological ...
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The article discusses research by biogeochemists at the University of California, Riverside, investigating the link between the glacial runoff and the rapid evolution of animal life. Topics include the research methodology the team used to calculate the phosphorus concentrations of oceans one billion years ago, which is a key nutrient in biological ...
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Nature, 2000
The snowball Earth hypothesis posits an ice-covered planet. New climate simulations of ‘snowball’ conditions allow ice-free equatorial oceans that may be crucial for a theory about early animal evolution.
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The snowball Earth hypothesis posits an ice-covered planet. New climate simulations of ‘snowball’ conditions allow ice-free equatorial oceans that may be crucial for a theory about early animal evolution.
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