A new study of Californias southern Sierra Nevada range by a University of Colorado at Boulder research team has located a massive body of rock that sank into Earths mantle some 3.5 million years ago, allowing the mountains to pop up.
Sunrise illuminates the crest of the Sierra Nevada north of Mt. Whitney. These peaks owe their elevation to removal of weighty material from the base of the Sierra, material now seen descending into the mantle. Photo courtesy Craig Jones, CU-Boulder
Undertaken with a high-tech suite of instruments designed to probe the geology to roughly 125 miles below Earths surface, the study illustrated the mountain building process in the southern Sierras with unprecedented detail.
The study explains how the southern Sierra mountains rose when a body of underlying dense rock sank down and away from the base of the 35-kilometer-deep crust. Authored by CU-Boulder doctoral student Oliver Boyd and CU-Boulder geological sciences Associate Professors Craig Jones and Anne Sheehan, the paper appeared in the July 30 issue of Science.
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Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.
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In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
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