Tuesday, June 22, 2021
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Geology Page

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Zircons studied by the research team, photographed using cathodoluminescence, a technique that allowed the team to visualize the interiors of the crystals using a specialized scanning electron microscope. Dark circles on the zircons are the cavities left by the laser that was used to analyze the age and chemistry of the zircons.Scientists led by Michael Ackerson, a research geologist at the Smithsonian's National Museum of Natural History, provide new evidence that modern plate tectonics, a defining feature of Earth and its unique ability to support life, emerged roughly 3.6 billion years ago. The study, published May 14 in the journal Geochemical Perspective Letters, uses zircons, the oldest minerals ever found on Earth, to peer back into the planet's ancient past.The team tested more than 3,500 zircons, each just a couple of human hairs wide, by blasting them with a laser and then measuring their chemical composition with a mass spectrometer. These tests revealed the age and underlying chemistry of each zircon. Of the thousands tested, about 200 were fit for study due to the ravages of the billions of years these minerals endured since their creation. Credit: Michael Ackerson, Smithsonian.
Earth

Earth’s oldest minerals date onset of plate tectonics to 3.6 billion...

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McGill Colloidal Au research team study a mineralized (gold-bearing) vein underground at the Brucejack mine. Credit: Duncan McLeish
Earth

Clues from soured milk reveal how gold veins form

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The quantitative model used in the study explains the enigmatic melt degrees and layered structures observed in most cratons on Earth.
Earth

Where on Earth is all the water?

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Elements of a newly discovered process in plate tectonics include a mass (rock slab weight), a pulley (trench), a dashpot (microcontinent), and a string (oceanic plate) that connects these elements to each other. In the initial state, the microcontinent drifts towards the subduction zone (Figure a). The microcontinent then extends during its journey to the subduction trench owing to the tensional force applied by the pull of the rock slab pull across the subduction zone (Figure b). Finally, the microcontinent accretes to the overriding plate and resists subduction due to its low density, causing the down-going slab to break off (Figure c). Credit: Erkan Gün/University of Toronto
plate tectonics

Discovery of new geologic process calls for changes to plate tectonic...

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Karen Heeter overlooks Yellowstone from Republic Pass on a tree coring excursion in July 2018. Credit: Grant L. Harley
Earth

Yellowstone National Park is hotter than ever

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This study site was used by researchers to examine a portion of the Oman–United Arab Emirates ophiolite’s metamorphic sole. Credit: Tyler Ambrose
Earth

A closer look at the creation of a metamorphic sole

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Early lineages of mammal like this large Gobiconodon from Mongolia, outcompeted the ancestors of modern mammals in the time of dinosaurs. Credit: Corbin Rainbolt
Dinosaur

Mammals in the time of dinosaurs held each other back

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A cross-section of an 18.5 million-year-old fossil of Ampelorhiza heteroxylon. Credit: Nathan Jud/Provided
Fossils

18.5 million year old vine fossil identified as new species

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The Earth has a layered internal structure with the crust, upper mantle, mantle transition zone, lower mantle, outer core, and inner core from the surface to the center. In the Earth’s formation stage at approximately 4.6 billion years ago, the heavy metal components were separated from silicates and sank in the magma ocean, and a core formed at the center of the Earth. In this core-mantle separation process, partitioning of noble gases between the core and mantle occurred. Credit: Taku Tsuchiya, Ehime University
Earth

A deep reservoir of primordial helium in the Earth

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Hesperornis image provided by the Yale Peabody Museum of Natural History. (Photo: Robert Lorenz)Hesperornis image provided by the Yale Peabody Museum of Natural History. (Photo: Robert Lorenz)
Dinosaur

What can a dinosaur’s inner ear tell us? Just listen

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The last common ancestor of chimpanzees and humans represents the starting point of human and chimpanzee evolution. Fossil apes play an essential role when it comes to reconstructing the nature of our ape ancestry. Printed with permission from © Christopher M. Smith
Fossils

Most human origins stories are not compatible with known fossils

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An enhanced image of Bicellum showing an outer wall of sausage-shaped cells enclosing an inner cell mass. Credit: Boston College
Fossils

Microfossil found in Scottish Highlands could be a new insight into...

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Researchers also want to encourage the locals to develop practical evacuation plans to help them feel less pessimistic about their survival odds. Credit: Katsushika Hokusai
Earthquake

Previously unrecognized tsunami hazard identified in coastal cities

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A close-up image of bladed barite crystals in the Mapepe Formation in the Barberton Greenstone Belt of South Africa. Credit: Desiree Roerdink
Continents

New research uncovers continental crust emerged 500 million years earlier than...

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Seismogram
Earthquake

Earthquake, tsunami hazards from subduction zones might be higher than current...

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Fracking
Earthquake

Local impacts from fracking the Eagle Ford

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"Hollywood" specimen, same species as Teratophoneus, discovered approximately two miles north of the "Rainbows and Unicorns Quarry" on Grand Staircase-Escalante National Monument. Credit: U.S. Bureau of Land Management
Dinosaur

Fearsome tyrannosaurs were social animals, study shows

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Illustration showing how the three new species of fossil cloud rats might have looked. Credit: © Velizar Simeonovski, Field Museum.
Fossils

Fossils of ‘giant cloud rats’ discovered in Philippine caves

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Rafinesquina, seen in this close-up shot, was an ancient genus of brachiopod belonging to order Strophomenida. This order survived two mass extinction events, but the second represented a ‘death sentence’ from which they were unable to recover diversity, persisting for another hundred million years as a ‘dead clade walking’ before their eventual extinction. IMAGE: Provided by Benjamin Barnes
Fossils

New insights into mass extinctions

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Bathymetric chart of a part of the Red Sea. Source GEOMAR.
plate tectonics

Red Sea is no longer a baby ocean

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