Tuesday, July 7, 2020
plate tectonics

plate tectonics

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Researchers developed a technique that allows them to study the atomic arrangements of liquid silicates at the extreme conditions found in the core-mantle boundary. This could lead to a better understanding of the Earth's early molten days, which could even extend to other rocky planets. Credit: Greg Stewart/SLAC National Accelerator Laboratory
plate tectonics

Earth’s evolutionary tale, researchers probe materials at deep-Earth conditions

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Francis Macdonald walks along a road near Manitou Springs, Colorado, where an exposed outcrop shows a feature known as the "Great Unconformity."
plate tectonics

The Great Unconformity : A billion years is missing from the...

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An artistic cross-section through forming crust approximately 3-4 billion years ago. The presence or absence of plate tectonics during this time is a topic of vigorous scientific debate. A study led by Harvard geologists has found evidence that the crust moved quickly over Earth's surface in the deep past, a hallmark of modern plate tectonics. This suggests that plate motion could have been a meaningful process in early Earth history. Credit: Alec Brenner, Harvard University
plate tectonics

Tectonic plates started shifting earlier than previously thought

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Geologists studying rock samples from Baffin Island find lost fragment of continent. Credit: istock
plate tectonics

Geologists find lost fragment of ancient continent in Canada’s North

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The rocks the team analysed are the oldest preserved mantle rocks. They allow us to see into the early history of the Earth as if through a window. Credit: UNSW
plate tectonics

Building blocks for life on Earth arrived much later than we...

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Benjamin Johnson of Iowa State University woks at an outcrop in remote Western Australia where geologists are studying 3.2-billion-year-old ocean crust. Photo by Jana Meixnerova. Photos provided by Benjamin Johnson.
plate tectonics

Geologists determine early Earth was a ‘water world’ by studying exposed...

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Isobath map of the eastern Alborán basin with the volcanic edifice location. Orange lines show the main flood paths. (Image: García-Castellanos et al, 2020, Earth-Sciences Reviews)
plate tectonics

New pieces of evidence found in the Alborán Sea possibly related...

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Calculated lattice thermal conductivity of MgSiO3 postperovskite (PPv) and bridgmanite (Brg) under the Earth’s lowermost mantle conditions. Credit: Ehime University
plate tectonics

Heat transport property at the lowermost part of the Earth’s mantle

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Horseshoe Bend, Arizona
plate tectonics

As groundwater depletes, arid American West is moving east

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Credit: University of St Andrews
plate tectonics

Hidden past of Earth’s oldest continents unearthed

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Satellite image of the Gibraltar Arc. Credit: NASA
plate tectonics

Lithospheric thickening beneath the Betics and Rif mountains pulls down the...

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Earth's layers
plate tectonics

New insights into the formation of Earth’s crust

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A schematic summary of the effect of the convergence rate. Upper image shows a slow convergence rate allows thermal difussion and a derived reduction of slab's density (positive buoyancy). Lower image shows how a faster convergence rate increases the slab's density promoting the negative buoyancy. Credit: Kittiphon Boonma, Scientific Reports
plate tectonics

Study explores the density of the tectonic plates and why they...

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The deep structure of the continent Antarctica. Credit: Planetary Visions (credit: ESA/Planetary Visions)
plate tectonics

The Antarctic: Data about the structure of the icy continent

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This figure illustrates how inorganic carbon cycles through the mantle more quickly than organic carbon, which contains very little of the isotope carbon-13. Both inorganic and organic carbon are drawn into Earth's mantle at subduction zones (top left).
plate tectonics

Study points to one cause for several mysteries linked to breathable...

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Spherules in the Barberton greenstone belt in the Kaapvaal craton, South Africa. Credit: Lowe et al., 2014.
plate tectonics

Extra-terrestrial impacts may have triggered ‘bursts’ of plate tectonics

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Reconstructed paleo-elevation in southwestern North America at the Late Eocene (36 million years ago). Credit: Bahadori and Holt
plate tectonics

New geologic modeling method explains collapse of ancient mountains in American...

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Earth
plate tectonics

Telescopes and satellites combine to map entire planet’s ground movement

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Images of the numerical solution at the moment when a supercontinent (left, in purplish grey) begins to break up. In the image on the left, the modelled fictional planet looks much like the Earth: its surface and mantle move spontaneously, at speeds close to those observed on Earth. The distribution of the plates (some of which are large, while many are small) is also similar, as is the topography: red hues represent shallow regions of the ocean (ridges), while blue indicates the deep seafloor. The deepest blue areas correspond to subduction trenches (where a plate is sinking into the mantle). The continents are shown in translucent white (and therefore appear purplish grey).The image on the right shows warm currents (plumes) rising from the bottom of the mantle. Credit: Nicolas Coltice
plate tectonics

What makes the Earth’s surface move?

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As part of MISTI-India, Megan Guenther, a junior in EAPS, records field notes about the landscape of the Kohistan-Ladakh region of the Himalayas in northern India. Credit: Craig Martin
plate tectonics

Collision course: A geological mystery in the Himalayas

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