Weak tides during Cryogenian glaciations
نویسندگان
چکیده
منابع مشابه
A Cryogenian chronology: Two long-lasting synchronous Neoproterozoic glaciations
The snowball Earth hypothesis predicts globally synchronous glaciations that persisted on a multimillion year time scale. Geochronological tests of this hypothesis have been limited by a dearth of reliable age constraints bracketing these events on multiple cratons. Here we present four new Re-Os geochronology age constraints on Sturtian (717–660 Ma) and Marinoan (635 Ma termination) glacial de...
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The Neoproterozoic was an era of great environmental and biological change, but a paucity of direct and precise age constraints on strata from this time has prevented the complete integration of these records. We present four high-precision U-Pb ages for Neoproterozoic rocks in northwestern Canada that constrain large perturbations in the carbon cycle, a major diversification and depletion in t...
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Sedimentary hydrocarbon remnants of eukaryotic C26-C30 sterols can be used to reconstruct early algal evolution. Enhanced C29 sterol abundances provide algal cell membranes a density advantage in large temperature fluctuations. Here, we combined a literature review with new analyses to generate a comprehensive inventory of unambiguously syngenetic steranes in Neoproterozoic rocks. Our results s...
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Some of Earth’s greatest relief occurs where glacial processes act on mountain topography1,2. This dramatic landscape is thought to be an imprint of Pleistocene glaciations3,4. However, whether the net effect of glacial erosion on mountains is to increase5–7 or decrease8–10 relief remains disputed. It has been suggested that in the European Alps, the onset of widespread glaciation since the mid...
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4-Hydroxyanisole (4-OHA) was administered to C57Bl/lOJ mice in which B16 melanoma or Lewis lung carcinoma had been implanted s.c. or i.m. The drug had the largest antitumour effect against B16 melanoma growing s.c. and a smaller antitumour effect against B16 melanoma or Lewis lung carcinoma growing i.m. In the treatment regimens where drug was administered only after tumour implantation, a sign...
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ژورنال
عنوان ژورنال: Nature Communications
سال: 2020
ISSN: 2041-1723
DOI: 10.1038/s41467-020-20008-3