Monday, May 23, 2022
plate tectonics

plate tectonics

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plate tectonics

X-ray view of subducting tectonic plates

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Minerals are visible in rock samples from the coast of Oman. Scientists said these rocks may reveal new information about subduction, an important tectonic process on Earth. Credit: Joshua Garber / Penn State.
plate tectonics

Mineral dating reveals new clues about important tectonic process

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A series of earthquakes and aftershocks shook the Ridgecrest area in Southern California in 2019. Distributed acoustic sensing (DAS) using fiber-optic cables enables high-resolution subsurface imaging, which can explain the observed site amplification of earthquake shaking. Credit: Yang et al., 2022
plate tectonics

Fiber-optic cables can produce high-resolution underground maps

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The edges of Earth’s tectonic plates, centered over the Pacific Ocean. Colors indicate whether plates are scraping past (yellow), diving under (green), or pulling away (red) from one another. Study site near New Zealand marks the location of a newly forming subduction zone. Credit: Brandon Shuck/University of Texas Institute for Geophysics
plate tectonics

How does a major subduction zone get started? It may begin...

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A view of the graben, which emerged near the Holuhraun lava field in Iceland. The western boundary of the graben is seen in the foreground, in the center-right portion of the image, where the land begins to dip down. Credit: Stephan Kolzenburg
plate tectonics

As tectonic plates pull apart, what drives the formation of rifts?

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Rapid erosion of supermountains released large amounts of nutrients, which were eventually carried into the oceans. Photo: Peter Campbell
plate tectonics

Supermountains controlled the evolution of life on Earth

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Fault zone with broken rock inside stippled lines and faulting directions of each rock segment outlined by half arrows. Photo credit: Henrik Drake. Illustration: Mikael Tillberg.
plate tectonics

How fault lines in a kitchen sink are changing what we...

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Researchers used thermochronometric data from four North American locations to determine the cause of the “Great Unconformity”—a massive loss of rock about 700 million years ago. Credit: Kalin McDannell
plate tectonics

New research strengthens link between glaciers and Earth’s ‘Great Unconformity’

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The model offers new insights into how the plate subducted under Japan breaks into segments by bending and thereby crushing olivine grains on its underside. (Graphic: Taras Gerya / ETH Zurich)
plate tectonics

Crushed resistance: Tectonic plate sinking into a subduction zone

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Boudins of amphibolite layers (metamorphosed basalts) that were stretched within quartz schists (Norway). Photo credits © Haakon Fossen.
plate tectonics

Fate of sinking tectonic plates is revealed

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A map of the World Ocean Floor. Credit: Library of Congress, Geography and Map Division
plate tectonics

Geologists take Earth’s inner temperature using erupted sea glass

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The cliffs of the volcanic island of Santorini showing the layers of deposits from past volcanic eruptions. Credit: co-author Dr. Ralf Gertisser (Keele University).
plate tectonics

Sea levels influence eruptions on volcanic island

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A "Plume" in the Earth's mantle, i.e. a surge of hot material, caused the Indian Plate to spin off. (Graphic: Alisha Steinberger)
plate tectonics

Supervolcano fed from Earth’s mantle caused crustal plates to rotate

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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.
plate tectonics

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

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

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

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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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From left, University of Wyoming students Shane Scoggin, Adam Trzinski and Jessie Shields are part of new research investigating crustal melting in western North America. Here, they examine igneous rocks in the Snake Range of Nevada. Credit: Jay Chapman
plate tectonics

Scientists probe mysterious melting of Earth’s crust in western North America

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The Atlantis II fracture zone in the southwestern Indian Ocean with a zoom on the northern corner. The greater water depth in the transform valley is clearly visible. As the plates move, magmatism in the corners refills the deep transform valleys so that the adjacent fracture zones are shallower. Graphic: Christoph Kersten/GEOMAR according to Grevemeyer et al., 2021
plate tectonics

A new view on plate tectonics

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In this image, the warped amount of the surface is due to the opening of the Central American gateway that allowed hot material to flow through. (a) Before 8.5 million years ago, hot material was upwelling under the Galapagos from deep inside the Earth, but was blocked out of the Caribbean because of a curtain of subducting plate. (b) A gateway opened at 8.5 million years ago allowing the hot material to flow through. (c) Today, the hot material reaches midway between Central America and the Lesser Antilles, tilting up the bottom of the Caribbean sea by about 300 m (1,000 ft). Credit: University of Houston
plate tectonics

Geologists discover powerful ‘river of rocks’ below Caribbean

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