Articles tagged with Earth Mantle
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A team of scientists discovered the King's Trough Complex, a colossal submarine canyon off Portugal's coast, formed by tectonic processes and hot mantle material. The structure extends over 500 kilometers, with Peake Deep as one of the deepest points in the Atlantic Ocean.
Researchers confirm nickel-rich metallic alloys in diamonds from South Africa's Voorspoed mine, revealing a 'redox-freezing' reaction between oxidized melts and reduced mantle rock. The study provides new insights into mantle dynamics and the formation of kimberlites, ocean island basalts, and volcanic magmas.
Researchers have discovered that low-velocity zones beneath subducting tectonic plates are caused by partial melts generated from upwelling water-rich mantle material. These melt pockets rise through the mantle, creating a global water-recycling loop and lubricating plate motion.
Researchers discovered that solid rock flows horizontally in the lower edge of the Earth's mantle, accelerating seismic waves. This finding solves the mystery of the D" layer and opens a window into the dynamics of the Earth's deepest interior.
Researchers have discovered that the underside of the North American continent is experiencing 'cratonic thinning', a phenomenon where the continent is slowly losing its stability and rock layers. This process, driven by the subduction of the Farallon Plate, may eventually stop as the plate sinks deeper into the mantle.
A new study from York University combines fluid mechanics and chemistry to understand the Earth's early evolution. Researchers found that the lower mantle's structure was established four billion years ago, with most crystals forming at low pressure, leading to a different chemical signature than previously thought.
Researchers modelled mantle convection to show African LLVP has older, better mixed material than Pacific LLVP, which is enriched in subducted oceanic crust. This difference affects heat extraction from Earth's core, posing a challenge for observations and models.
Research team finds that heavy Mg isotopic signatures in volcanic rocks can be explained by partial melting of serpentinite-dominated mélanges. The study proposes a novel model involving diapiric rise and melting of these mélanges, which aligns with geochemical characteristics of arc magmas.
Two large 'islands' with the size of a continent have been found in the Earth's mantle, showing they are at least half a billion years old. Seismologists discovered these regions by studying the tones and sound volume of seismic waves, finding little damping in the islands, but high damping in nearby cold slab graveyard.
Researchers from Göttingen University and Max Planck Institute for Solar System Research discovered the Moon formed from material ejected from the Earth's mantle. The findings support the idea that water reached Earth early in its development, contrary to the prevailing assumption of late impacts.
Researchers have discovered unexpected zones in Earth's mantle beneath large oceans and continents, contradicting current plate tectonic theories. The new high-resolution model uses full-waveform inversion to reveal anomalies that may indicate ancient or iron-rich material.
Recent study reveals that Earth's mantle is chemically more homogeneous than previously thought, with lavas acquiring unique properties during ascent. This discovery has significant implications for understanding Earth's formation, plate tectonics, and global element cycles.
Researchers investigate the effect of oxygen content on mantle rock melting and early Earth magma ocean formation. The study reveals that oxygen fugacity significantly influences melting temperatures, suggesting current models need revision.
An international team has recovered a nearly continuous 1,268-metre-long section of rocks that originated in the Earth's mantle, providing insights into the role of the mantle in the origins of life on Earth, volcanic activity, and global cycles. The study also reveals new information about how magma is formed and feeds volcanoes.
A recent study found that volcanic 'fires' in Iceland were triggered by the storage and melting of magma beneath the Earth's crust. The team used geochemical analysis to discover that the magma comes from underground melting of the crust, rather than directly from the mantle.
Researchers analyzed rocks collected from seafloor, finding they date back to at least 2.5 billion years ago and have retained a stable oxidation state since then. The discovery provides new evidence on Earth's geologic history and sheds light on the planet's evolution.
A new study reveals that solar radiation can affect the Earth's deep interior, influencing the redox state of arc magma. The research found a latitude-dependent distribution of arc magma with less oxidized magma in lower latitudes.
Researchers used high-energy laser experiments to study magnesium oxide's melting point and phase transitions under ultra-high pressures. The findings suggest the mineral could be the earliest solid to crystallize in forming super-Earths.
Research sheds light on how concentrations of metals used in renewable energy technologies can be transported from deep within the Earth's interior mantle by low temperature, carbon-rich melts. Carbonate melts effectively dissolve and transport base metals, precious metals, and oxidised sulfur.
Researchers have discovered large undersea faults on the Pacific Ocean floor that are pulling the Pacific Plate apart. The newly found faults, some thousands of meters deep and hundreds of kilometers long, are weakening the plate due to immense forces within it.
Researchers studying oceanic transform faults have found a previously unknown part of the geological carbon cycle, revealing a potentially vast sink for CO2. The study's findings suggest that magmatic degassing and melt impregnation in these faults contribute significantly to global CO2 fluxes.
Researchers propose that ancient planet Theia collided with Earth billions of years ago, forming two continent-sized blobs of unusual material and the Moon. The blobs, known as large low-velocity provinces (LLVPs), are rich in iron and likely composed of different proportions of elements than the mantle surrounding them.
Researchers analyzed whiteschist from the Dora Maira Massif to study rapid upward movements, revealing a sharp decrease in pressure or decompression. This suggests that UHP rocks may not have reached a depth of 120 kilometers before returning to the surface.
Geologists at Utrecht University reconstructed the history of lost continent Argoland, which was fragmented into microcontinental shards. The team found that Argoland is still present, albeit in fragments, beneath the islands of Indonesia and Myanmar, revealing a puzzle that fits seamlessly between neighboring geological systems.
A University of Alberta study of superdeep diamonds provides previously unknown information about the formation and transport of diamonds within Gondwana, a ancient supercontinent. The research reveals that diamonds were transported to the base of Gondwana by host rocks carrying subducted mantle material.
The study predicts thermal conductivity of bridgmanite and post-perovskite at high pressure and temperature, clarifying heat flow distribution and magnitude at the core-mantle boundary. The team obtained a heat flux of 7.1 ± 0.5 TW, which is significant for understanding Earth's coupled core-mantle evolution and geodynamo operation.
Researchers reconstructed a massive tectonic plate from fragments found in mountain belts around the world. They discovered that the plate, named Pontus, existed for at least 150 million years and had a significant impact on Earth's geological history.
A team of researchers from Japan found that water enhances energy dispersion and reduces elastic moduli in rocks, leading to increased seismic wave attenuation. The study suggests the oceanic asthenosphere must contain water, explaining sharp velocity drops and near-constant attenuation observed at the LAB.
A UNIGE team has developed a method to rapidly obtain valuable information about the structure of volcanoes. By analyzing three key parameters: height, rock thickness, and chemical composition of magma, scientists can identify the active volcanoes most likely to produce large-scale eruptions.
An international team of scientists has discovered a link between Earth's ancient atmosphere and the chemistry of its deep mantle. The study found that sediment recycling provided atmospheric access to the mantle, leading to increased oxidation of calc-alkaline magma and altering the composition of the continental crust.
Geoscientists at Cornell University have discovered that gaseous carbon dioxide can trigger explosive eruptions in basaltic volcanoes. The research uses a new model to suggest that magma comes directly from the mantle, stored tens of kilometers below Earth's surface.
African Superplume is responsible for rift-parallel deformation and seismic anisotropy in the East African Rift System, contradicting previous theories on plate-driving forces. The study uses 3D thermomechanical modeling to explain this phenomenon.
Researchers investigate Denali Fault's mantle-to-crust connections to understand seismic cycle and linkages between fluid flow, seismicity, and fault strength. Bubbling springs along the fault indicate intact connections to the mantle, suggesting a 'roadblock' may prevent future earthquakes.
Researchers at Colorado State University have made a groundbreaking discovery in understanding how mountains form, revealing that deep Earth processes are the primary drivers of mountain building in subduction zones. By combining novel data sets and techniques with traditional geomorphology measurements, the team generated a long-term ...
New research from Rice University suggests that ancient microorganisms helped cause massive volcanic events by facilitating the precipitation of minerals in banded iron formations. The study provides insight into processes that could produce habitable exoplanets and reframes scientists' understanding of Earth's early history.
A study from Smithsonian researchers deepens understanding of Earth's crust by testing and eliminating the garnet hypothesis about why continental crust is lower in iron and more oxidized. The findings suggest that intense heat and pressure cannot produce the necessary conditions for garnet formation, contradicting a popular explanation.
Research led by The University of Alabama reveals a dense, yet thin, layer of ancient ocean floor surrounding the Earth's core-mantle boundary. This ultra-low velocity zone is denser than the rest of the deep mantle and may play an important role in heat escape from the core.
QUT researchers have solved a long-held geological conundrum about how diamonds formed in the deep roots of the earth's ancient continents. The study used computer modeling on an ancient rock sample to determine that diamonds are rare today and were always rare, challenging the existing explanation.
Researchers from Florida State University used high-performance computing to simulate the Earth's early history, finding that an ancient magma ocean solidified in under 2 million years. This discovery helps explain chemical diversity in the lower mantle and layering within the Earth.
Researchers have discovered a new layer of partly molten rock under the Earth's crust that helps settle a long-standing debate about how tectonic plates move. The study reveals that the melt layer has no significant influence on plate tectonics, with convection of heat and rock being the prevailing force.
David Kohlstedt's lab recreated the mantle's conditions, observing microscopic changes and scaling up results to real-world size. This work underlies modern geophysics and has improved our understanding of earthquakes, volcanoes, and the planet's surface.
A new study by University of Helsinki researchers finds that magma floods can form in thick tectonic plates, contradicting the long-held assumption. The research uses geochemical modelling to demonstrate that high-temperature mantle sources can produce magmas with similar trace element compositions as low-pressure conditions.
Researchers have discovered that aluminous silicas play a significant role in transporting water into the Earth's deep interior. These minerals can hold large amounts of water even at high temperatures, challenging previous assumptions about the water cycle in the mantle.
Scientists have discovered a slowing of continental plate movement was the critical event that enabled magma to rise to the surface and deliver devastating knock-on impacts. This fundamental process controlled the evolution of climate and life on Earth throughout its history.
Researchers found that under the extreme conditions of the core-mantle boundary, carbon from the core reacts with iron alloy to form diamond. This process may have occurred for billions of years, supplying enough carbon to explain high amounts in the mantle.
A team of researchers has confirmed that regions in the central Andes Mountains were formed through a process called lithospheric dripping, where parts of the planet's outer shell sink into the mantle over millions of years. This discovery may have implications for other terrestrial planets with non-Earth-like plate tectonics.
A new study suggests that Earth's deep mantle was drier than initially thought, with a water concentration 4-250 times lower than the upper mantle. This finding challenges the assumption that the mantle was uniform from its formation and may have prevented mixing within the mantle.
Researchers have discovered changes in the Earth's outer core, which are responsible for generating the magnetic field. According to Zhou's findings, a one-second discrepancy in SKS wave travel time indicates the formation of low-density regions with light elements such as hydrogen and oxygen.
A University of Utah and New Zealand study reveals that CO2 deep underground allows magma to avoid being trapped, reaching the surface and pooling into persistent lava lakes. This finding expands our understanding of magma sources and transport to the surface, particularly in rift volcanoes.
Researchers discovered banded iron formations as a new geochemical archive to study the early Earth's evolution. They found that iron- and silica-rich layers deposited from seawater can record the Earth's mantle and crust development. This approach offers new insights into the Precambrian Earth.
Researchers found that some magmas originate from mantle portions with early crust remnants, suggesting a 'graveyard' of old material survived for billions of years. This discovery sheds light on the formation of large continents and the evolution of Earth's atmosphere.
Physicists are using a deposit of nearly pure argon, extracted from southwest Colorado, to search for answers about the universe's dark matter. The argon is separated from carbon dioxide and shipped to Italy for use in the DarkSide-20k detector.
Scientists discovered that earthquakes influence tectonic plate movement, altering frequency and patterns of quakes. This finding suggests improved earthquake risk models can be developed by incorporating feedback mechanisms after an earthquake.
Researchers have measured deformation of mineral davemaoite under conditions inside the Earth's mantle, finding it to be surprisingly soft. This discovery challenges previous ideas about subducting slabs in the lower mantle, suggesting a detachment of crust from the underlying plate can occur.
Researchers have obtained a 3D structure of the largest-scale ultra-low velocity zone beneath the Pacific Ocean, measuring its height and lateral extent. The study reveals a mega-sized ULVZ with a shear velocity perturbation of around 10%, providing new insights into the dynamic evolution of the earth's lower mantle.
The study updates the pyrolite model by adding lateral temperature heterogeneity in the lower mantle transition zone, fitting well with observed properties. The results suggest no need to introduce a novel component into lower MTZ, supporting whole mantle convection.
Researchers found variations in carbon isotopes in younger kimberlites, suggesting the Cambrian Explosion affected the Earth's lower mantle. The study suggests that changes in marine sediments leave profound traces on the Earth's interior.
A recent seismic study reveals that Patagonia is rising as glaciers melt due to a gap in the tectonic plate under the region. The study found low seismic velocity and a thinning of the lithosphere above the gap, which is driving rapid uplift.
Researchers use boron isotopes to identify sources and properties of fluids in subduction zones. They found that serpentinite-derived fluid drives metasomatism in continental subduction zones.
A team of researchers used computer modeling to discover that water-rich magmas are more buoyant and fluid than previously thought, allowing them to rise through the upper mantle towards the surface. This discovery provides new insight into the deep Earth water cycle and its connection to Earth's habitability.