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Oct292019 by adminNo Comments

Geologists locate source of chemical signature in ancient volcanic rocks

Science

Oct. 28 (UPI) -- Geologists have linked ancient volcanic activity with a unique geochemical signature measured in rock samples recovered from the coast of Greece. According to a new study published this week in the journal Nature Geoscience, an ancient ring of explosive arc volcanoes, which erupted some 45 million years ago, accounts for the highly oxidized rocks found along the coast of Greece. Researchers hypothesized that fluids from subducted oceanic rocks can explain the oxidation found in rocks formed by the arc volcanoes. To test their hypothesis, scientists went looking for the fluid source's geochemical signature in ancient subducted oceanic crust located on the Greek island of Sifnos. Oxidizing fluids influence the iron isotope composition found large garnet crystals, and becau...

Nov262018 by adminNo Comments

Researchers locate carbon reserve six feet below the soil's surface

Science

Nov. 26 (UPI) -- At least a quarter of all the carbon stored in Earth's soil is found locked up in minerals roughly six feet beneath the surface. But new research suggests this unique carbon reservoir will become less efficient at carbon storage as the planet warms. To better understand how rising carbon dioxide levels in the atmosphere will impact the planet's climate, scientists need to more accurately model Earth's many carbon cycles. Soil hosts one of those carbon cycles. As part of a new survey, the first of its kind, researchers detailed the way carbon physically and chemically binds to minerals in soils across the globe. The results of the survey were published Monday in the journal Nature Climate Change. "We know less about the soils on Earth than we do about the surface of Mars,"...

Jul192018 by adminNo Comments

Biologists locate baby white sharks' hangout in North Atlantic

Science

July 18 (UPI) -- With the help of next-generation satellite and acoustic technology, marine biologists have identified the migration patterns and hangouts of baby white sharks in the North Atlantic. Researchers have long suspected that the New York Bight, a seafloor indentation running from New Jersey's Cape May Inlet to Montauk Point on the eastern tip of Long Island, serves as a nursery for newborn and juvenile white sharks. But a nursery must meet three specific criteria: it must host higher densities of young sharks; it must be used year after year, over years; and it must be used as a residency for extended periods. Until now, scientists have only been able to confirm the New York Bight's adherence to the first two criteria. However, the recent tagging and tracking of 10 baby white ...

Jul182017 by adminNo Comments

Gamma-ray telescopes locate high-energy trap in the middle of the Milky Way

Science

July 18 (UPI) -- According to the latest observations from several large gamma-ray telescopes, the center of the Milky Way contains a high-energy trap, where cosmic rays are slowed by clouds of gas and dust."Our results suggest that most of the cosmic rays populating the innermost region of our galaxy, and especially the most energetic ones, are produced in active regions beyond the galactic center and later slowed there through interactions with gas clouds," Daniele Gaggero, an astronomer at the University of Amsterdam, said in a news release.Tracing the paths of cosmic rays is nearly impossible. But when they interact with matter, like a gas cloud in the middle of the Milky Way, the matter gets excited and emits gamma rays, which can be observed by NASA's Fermi Gamma-ray Space Telescope ...