Tuesday, January 26, 2021
plate tectonics

plate tectonics

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A graphic showing the convective heat cycle (red arrows) that drives plate tectonic motion (black arrows) on Earth. Heat flows toward subduction zones through the uppermost mantle layer, the asthenosphere. A computer model from Rice University finds that the asthenosphere can locally drag plates along with it rather than acting exclusively as a brake on plate movements as had been widely believed. (Image courtesy of Surachit/Wikimedia Commons)
plate tectonics

Former piece of Pacific Ocean floor imaged deep beneath China

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Final model for the East African Rift System. Hashed lines indicate newly discovered broad deforming zone. Arrows represent predicted tectonic plate motions. ABFZ—Andrew Bain Fracture Zone; IFZ—Indomed Fracture Zone; RSZ—Ranotsara shear zone. Figure created by D.S. Stamps.
plate tectonics

East African Rift System is slowly breaking away, with Madagascar splitting...

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The journey of Hawaii's pancake from its creation at the mantle plume to where it slipped under the Pacific plate and sunk deep into the Earth's mantle. Credit: Michigan State University
plate tectonics

Researchers discover ‘missing’ piece of Hawaii’s formation

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Three-dimensional visualisation of partial melting at the base of tectonic plates. The orange iso-surfaces show the regions where, at a depth of between 100 and 300 km, the quantity of molten rock is greater than 0.2%. The white sphere in the centre of the globe represents the Earth’s core. Credit © Stéphanie Durand, Laboratoire de géologie de Lyon: Terre, planètes et environnement (CNRS/ENS de Lyon/Université Claude Bernard Lyon 1).
plate tectonics

Deep magma facilitates the movement of tectonic plates

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A 3D block diagram across North America showing a mantle tomography image reveals the Slab Unfolding method used to flatten the Farallon tectonic plate. By doing this, Fuston and Wu were able to locate the lost Resurrection plate.
plate tectonics

Lost and found: Geologists ‘resurrect’ missing tectonic plate

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Central Alps of Switzerland
plate tectonics

Formation of the Alps: Detaching and uplifting, not bulldozing

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carbon cycle
plate tectonics

Understanding Earth’s ‘deep-carbon cycle’

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Location and geological map of Yukinoura district, Saikai City, Nagasaki Prefecture, Japan. Credit: Professor Tadao Nishiyama
plate tectonics

Japan’s geologic history in question after discovery of metamorphic rock microdiamonds

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Minerals inside tiny crystals could reveal how Earth's crust began moving.
plate tectonics

Unearthing evidence for the origins of plate tectonics

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The Dipping Moho is a sign of one continent being thrust over another. Credit: IGG
plate tectonics

Plate tectonics goes global

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Graduate student Mike Duvall is pictured here in southeastern Nepal during fieldwork in 2017. Image credit: John Waldron
plate tectonics

Scientists discover fault system in southeastern Nepal

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San Andreas Fault Zone
plate tectonics

Chance of big San Andreas earthquake increased by Ridgecrest temblors, study...

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A snapshot of a model from the new work, showing the late stages of growth and coalescence of a new global fracture network. Fractures are in black / shadow, and colors show stresses (pink color denotes tensile stress, blue color denotes compressive stress).
plate tectonics

A new idea on how Earth’s outer shell first broke into...

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The Andes seen from space. The height of the Andes, like the height of other mountain ranges on Earth, is determined by tectonic forces (Credit: NASA; Astronaut photograph ISS059-E-517).
plate tectonics

Which factors control the height of mountains?

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New Curtin University research on the remixing of Earth's stratified deep interior suggests that global plate tectonic processes, which played a pivotal role in the existence of life on Earth, started to operate at least 3.2 billion years ago. Credit: Professor Zheng-Xiang Li
plate tectonics

Remixed mantle suggests early start of plate tectonics

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Proposed model for deep-carbon transport along a cratonic boundary in the EARS study region.
plate tectonics

Scientists decipher the role of carbon and the break-up of continents

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This artist’s impression shows a view of the surface of the planet Proxima b orbiting the red dwarf star Proxima Centauri, the closest star to the Solar System. The double star Alpha Centauri AB also appears in the image to the upper-right of Proxima itself. Proxima b is a little more massive than the Earth and orbits in the habitable zone around Proxima Centauri, where the temperature is suitable for liquid water to exist on its surface. (Illustration by ESO/M. Kornmesser)
plate tectonics

Study finds a (much) earlier birth date for tectonic plates

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Subduction zones occur where one tectonic plate dives under another. New computer modeling by Magali Billen, professor of earth and planetary sciences at UC Davis, shows why earthquakes on these sinking plates cluster at certain depths and could give insight into processes deep in the Earth. (U.S. Geological Survey)
plate tectonics

New clues to deep earthquake mystery

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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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