Current Mantle News and Events

Current Mantle News and Events, Mantle News Articles.
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'Missing ice problem' finally solved
During glacial periods, the sea level falls, because vast quantities of water are stored in the massive inland glaciers. To date, however, computer models have been unable to reconcile sea-level height with the thickness of the glaciers. (2021-02-23)

'Problem of missing ice' finally solved by movement of the earth's crust
An international team of scientists published a study in Nature Communications today. This new reconstruction revolutionizes what is thought about the global continental ice mass during the Last Ice Age. (2021-02-23)

A new, clearer insight into Earth's hidden crystals
Geologists have developed a new theory about the state of Earth billions of years ago after examining the very old rocks formed in the Earth's mantle below the continents. (2021-02-17)

Vaporised crusts of Earth-like planets found in dying stars
Remnants of planets with Earth-like crusts have been discovered in the atmospheres of four nearby white dwarf stars by University of Warwick astronomers, offering a glimpse of the planets that may have once orbited them up to billions of years ago. (2021-02-11)

No new mountains formed during Earth's middle age, halting life's evolution for an eon
During the Proterozoic, Earth grew no taller - the tectonic processes that form mountains stalled, leaving continents devoid of high mountains for nearly 1 billion years, according to a new study. (2021-02-11)

Can super-Earth interior dynamics set the table for habitability?
New research led by Carnegie's Yingwei Fei provides a framework for understanding the interiors of super-Earths--rocky exoplanets between 1.5 and 2 times the size of our home planet--which is a prerequisite to assess their potential for habitability. Planets of this size are among the most abundant in exoplanetary systems. (2021-02-09)

Geological phenomenon widening the Atlantic Ocean
An upsurge of matter from deep beneath the Earth's crust could be pushing the continents of North and South America further apart from Europe and Africa, new research has found. (2021-01-27)

Diamonds need voltage
Diamonds are fascinating - as jewellery but also because of the extreme hardness of the material. How exactly this variant of carbon is formed deep underground and under extremely high pressures and temperatures remains a mystery. Now, researchers from the Russian Academy of Sciences Novosibirsk, collaborating with the German Research Centre for Geosciences GFZ, have documented a new influencing factor in theory and experiment. Weak electric fields can be a decisive catalyst for its formation (2021-01-21)

Geologic history written in garnet sand
Syracuse University researchers probe deep secrets of trapped inclusions in garnet sand from Papua New Guinea (2021-01-14)

New study of Earth's crust shows global growth spurt three billion years ago
Curtin University researchers have used ancient crystals from eroded rocks found in stream sediments in Greenland to successfully test the theory that portions of Earth's ancient crust acted as 'seeds' from which later generations of crust grew. (2021-01-12)

Insights into the Yellowstone hotspot
The Yellowstone hotspot is well known for generating supereruptions in the geologic past that are far more explosive than historic examples. The origin and sustained longevity of the hotspot is less understood but is focused on two competing models, where the ascent of hot mantle is derived from either a deep-seated mantle plume or a shallow mantle source. (2021-01-07)

Slow start of plate tectonics despite a hot early Earth
Writing in PNAS, scientists from Cologne university present important new constraints showing that plate tectonics started relatively slow, although the early Earth's interior was much hotter than today. (2020-12-22)

Secret of Australia's volcanoes revealed
New research from the University of Sydney proposes a theory that explains not only Australia's volcanic coast, but provides a framework for other incidences of intraplate volcanism in China, the US and the Caribbean. (2020-12-16)

New study helps pinpoint when earth's plate subduction began
According to findings published Dec. 9 in the journal Science Advances, plate subduction could have started 3.75 billion years ago, reshaping Earth's surface and setting the stage for a planet hospitable to life. (2020-12-09)

Newly discovered Greenland plume drives thermal activities in the Arctic
A team of researchers understands more about the melting of the Greenland ice sheet. They discovered a flow of hot rocks, known as a mantle plume, rising from the core-mantle boundary beneath central Greenland that melts the ice from below. (2020-12-07)

Continents prone to destruction in their infancy, study finds
Monash University geologists have shed new light on the early history of the Earth through their discovery that continents were weak and prone to destruction in their infancy. (2020-12-02)

A dessert-like desert: Californian lithosphere resembles crème brûlée
A model for the southeastern California lithosphere suggests that a strong upper crust overlies weaker lower rock layers. (2020-11-30)

Transportation of water into the deep Earth by Al-phase D
Researchers at Ehime University have recently measured the propagation speed of ultrasonic waves in an aluminum-rich hydrous mineral called Al-phase D at pressure conditions relevant to the Earth's deep mantle. Their results suggest that seismic shear anomalies observed locally beneath subduction zones may reveal the presence of hydrous minerals in the uppermost lower mantle, which would have important implications for the Earth's interior because hydrogen affects considerably the physical and chemical properties of mantle minerals. (2020-11-30)

Almost like on Venus
A team of international scientists led by ETH researcher Paolo Sossi has gained new insights into Earth's atmosphere of 4.5 billion years ago. Their results have implications for the possible origins of life on Earth. (2020-11-25)

Piecing together the Alaska coastline's fractured volcanic activity
Among seismologists, the geology of Alaska's earthquake- and volcano-rich coast from the Aleutian Islands to the southeast is fascinating, but not well understood. Now, with more sophisticated tools than before, a University of Massachusetts Amherst team reports unexpected new details about the area's tectonic plates and their relationships to volcanoes. (2020-11-17)

Former piece of Pacific Ocean floor imaged deep beneath China
In a study that gives new meaning to the term ''rock bottom,'' seismic researchers have discovered the underside of a rocky slab of Earth's lithosphere that has been pulled more than 400 miles beneath northeastern China by the process of tectonic subduction. (2020-11-16)

The connectivity of multicomponent fluids in subduction zones
A team of researchers has discovered more about the grain-scale fluid connectivity beneath the earth's surface, shedding new light on fluid circulation and seismic velocity anomalies in subduction zones. (2020-11-12)

Radioactive elements may be crucial to the habitability of rocky planets
The amount of long-lived radioactive elements incorporated into a rocky planet as it forms may be a crucial factor in determining its future habitability. That's because internal heating from the radioactive decay of the heavy elements thorium and uranium drives plate tectonics and may be necessary for the planet to generate a magnetic field. Earth's magnetic field protects the planet from solar winds and cosmic rays. (2020-11-10)

Distinct slab interfaces found within mantle transition zone
Prof. CHEN Qifu's group from the Institute of Geology and Geophysics, Chinese Academy of Sciences (IGGCAS) and their collaborators observed two distinct seismic discontinuities within the mantle transition zone (~410 km to 660 km) beneath the western Pacific. (2020-11-09)

Squid jet propulsion can enhance design of underwater robots, vehicles
Squids use a form of jet propulsion that is not well understood, especially when it comes to their hydrodynamics under turbulent flow conditions. Discovering their secrets can help create new designs for bioinspired underwater robots, so researchers are exploring the fundamental mechanism. They describe their numerical study in Physics of Fluids; among their discoveries, they found that thrust production and efficiency are underestimated within laminar, or nonturbulent, flows. (2020-11-03)

New mineral discovered in moon meteorite
The high-pressure mineral Donwilhelmsite, recently discovered in the lunar meteorite Oued Awlitis 001 from Apollo missions, is important for understanding the inner structure of the earth. (2020-11-03)

Magma 'conveyor belt' fuelled world's longest erupting supervolcanoes
International research led by geologists from Curtin University has found that a volcanic province in the Indian Ocean was the world's most continuously active -- erupting for 30 million years -- fuelled by a constantly moving 'conveyor belt' of magma. (2020-11-03)

SwRI study offers more complete view of massive asteroid Psyche
A new study authored by Southwest Research Institute planetary scientist Dr. Tracy Becker discusses several new views of the asteroid 16 Psyche, including the first ultra-violet observations. The study, which was published today in The Planetary Science Journal and presented at the virtual meeting of the American Astronomical Society's Division for Planetary Sciences, paints a clearer view of the asteroid than was previous-ly available. (2020-10-26)

Deep magma facilitates the movement of tectonic plates
A small amount of molten rock located under tectonic plates encourages them to move. This is what scientists from the LGL-TPE (CNRS/ENS de Lyon/UCBL1) have recently discovered. Their new model takes into account not only the velocity of seismic waves but also the way in which they are attenuated by the medium they pass through. The velocity of tectonic plates near the surface is thus directly correlated with the quantity of magma present. (2020-10-21)

A new way of looking at the Earth's interior
Current understanding is that the chemical composition of the Earth's mantle is relatively homogeneous. But experiments conducted by ETH researchers now show that this view is too simplistic. Their results solve a key problem facing the geosciences - and raise some new questions. (2020-10-21)

Lost and found: UH geologists 'resurrect' missing tectonic plate
A team of geologists at the University of Houston College of Natural Sciences and Mathematics believes they have found the lost plate known as Resurrection in northern Canada by using existing mantle tomography images. (2020-10-20)

Glimpse deep into Earth's crust finds heat source that may stabilize continents
Rocks from the Rio Grande continental rift have provided a rare snapshot of active geology deep inside Earth's crust, revealing new evidence for how continents remain stable over billions of years, according to a team of scientists. (2020-10-19)

Natural nanodiamonds in oceanic rocks
Natural diamonds can form through low pressure and temperature geological processes on Earth, as stated in an article published in the journal Geochemical Perspectives Letters. (2020-10-16)

Diamonds found with gold in Canada's Far North offer clues to Earth's early history
The presence of diamonds in an outcrop atop an unrealized gold deposit in Canada's Far North mirrors the association found above the world's richest gold mine, according to University of Alberta research that fills in blanks about the thermal conditions of Earth's crust three billion years ago. (2020-10-06)

Uncovering new understanding of Earth's carbon cycle
A new study led by a University of Alberta PhD student--and published in Nature--is examining the Earth's carbon cycle in new depth, using diamonds as breadcrumbs of insight into some of Earth's deepest geologic mechanisms. (2020-09-23)

Detaching and uplifting, not bulldozing
ETH researchers have used a computer model to test a new hypothesis about the formation of the Alps while simulating seismic activity in Switzerland. This will help improve current earthquake risk models. (2020-09-17)

OBS deep seismic survey uncovered crustal structure mystery of NW sub-basin of the SCS
The formation and evolution history of Northwestern sub-basin has many different opinions due to its own short-period spreading and strong volcanic activities. This research has provided the evidences from deep velocity structures in the Northwestern sub-basin. (2020-09-15)

Understanding the 'deep-carbon cycle'
New geologic findings about the makeup of the Earth's mantle are helping scientists better understand long-term climate stability and even how seismic waves move through the planet's layers. (2020-09-10)

Atomistic modelling probes the behavior of matter at the center of Jupiter
EPFL professor and NCCR MARVEL project leader Michele Ceriotti and colleagues have developed a physics-based machine learning approach to examine the behavior of hydrogen at extremely high pressures. The model reveals evidence of continuous metallization, and so has significant implications for planetary science. More fundamentally, it shows the way ahead for a simulation-driven change in how we understand the behavior of matter in fields as diverse as drug development and alloys for automobiles. (2020-09-09)

Japan's geologic history in question after discovery of metamorphic rock microdiamonds
A collaboration of researchers based in Kumamoto University, Japan have discovered microdiamonds in the Nishisonogi metamorphic rock formation in Nagasaki Prefecture, Japan. Microdiamonds in metamorphic rocks are important minerals because they form in continental collision zones and show that the crust has penetrated deeper than 120 km below the surface. This is the second area in the world, after the Italian Alps, that shows microdiamonds can form in metamorphic rocks through subduction of oceanic plates. (2020-09-04)

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