Results 41 to 50 of about 2,064 (153)
Analysis of a Precambrian resonance‐stabilized day length
Geophysical Research Letters, 2016 During the Precambrian era, Earth's decelerating rotation would have passed a 21 h period that would have been resonant with the semidiurnal atmospheric thermal tide.
Benjamin C. Bartlett, David J. Stevenson
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A Decrease to Low Carbonate Clumped Isotope Temperatures in Cryogenian Strata
AGU Advances, 2020 Preglacial and synglacial low‐latitude carbonate sediments of the Elbobreen Formation, NE Svalbard, preserve facies changes associated with low‐latitude glacial advance in Cryogenian “Snowball Earth” episodes (717–635 Ma).
T. J. Mackey +3 more
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Frontiers in Plant Science, 2022 For tens of millions of years (Ma), the terrestrial habitats of Snowball Earth during the Cryogenian period (between 720 and 635 Ma before present–Neoproterozoic Era) were possibly dominated by global snow and ice cover up to the equatorial sublimative ...
Jakub Žárský +6 more
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Influence of Orbital Forcing on the Snowball Earth Deglaciation
Geophysical Research LettersNeoproterozoic snowball Earth events lasted for multiple million years, experiencing many orbital cycles. Here we investigate whether the deglaciation of these events would be triggered more easily at certain orbital configurations than others, by using ...
Jiacheng Wu, Yonggang Liu
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Weak tides during Cryogenian glaciations
Nature Communications, 2020 How and why the ‘Snowball Earth’ occurred during the Cryogenian period is debated. Here, the authors show that the cryogenian ocean hosted diminished tidal amplitudes and associated energy dissipation rates, reaching 10-50% of today’s rates thus perhaps ...
J. A. Mattias Green +4 more
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Eos, Transactions American Geophysical Union, 2006 Many scientists have been considering the idea that the Earth may have completely frozen over sometime in the past. Kirschvink [1992] proposed that a runaway ice‐albedo effect on continents amassed in low latitudes caused the descent into a global freeze.
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MineralogiaThe diagenetic processes exhibited by the Neoproterozoic diamictites from Murchisonfjorden (Nordaustlandet, NE Svalbard) are presented. Diamictite samples from the Cryogene Polarisbreen Group - the Petrovbreen Member of the Elbobreen Formation and the ...
Bal Szczepan +6 more
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Deep‐Time Paleoclimate Proxies
AGU Advances, 2020 Pre‐Cenozoic climate (>66 million years ago) has been reconstructed with climate sensitive sedimentary deposits. However, sedimentary records are inherently local and can be affected by topography and oceanic and atmospheric currents.
Francis A. Macdonald
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Considering a Neoproterozoic Snowball Earth
Science, 1999 P. F. Hoffman et al. and N. Christie-Blick et al. discuss Hoffman et al.'s paper that "developed a modified 'snowball Earth' hypothesis (2) to explain the association of Neoproterozoic low-latitude glaciation with the deposition of 'cap carbonate' rocks bearing highly depleted carbon isotopic values (δ13C ≤ −5‰).
Christie-Blick, Nicholas +2 more
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Snowball Bistability Vanishes at Moderate Orbital Eccentricity
The Planetary Science JournalSnowball episodes are associated with increases in atmospheric oxygen and the complexity of life on Earth, and they may be essential for the development of complex life on exoplanets. Sustained, stable Snowball episodes require a Snowball bifurcation and
Xuan Ji, Dorian S. Abbot
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