Tag

Core Mantle Boundary

All articles tagged with #core mantle boundary

science21 days ago•25 min saved

Deep-Earth minerals could cradle oceans of water far beneath the crust

A Nature Geoscience study identifies two newly discovered iron oxyhydroxide minerals that could trap vast amounts of water deep in the lower mantle, around 2,900 kilometres below the surface near the mantle–outer core boundary. If confirmed, this suggests water equivalent to about one to two Pacific Oceans might reside inside Earth, though the evidence is preliminary and the water would be stored within minerals rather than as liquid oceans.

via WION|

#core-mantle-boundary #deep-mantle-water #iron-oxyhydroxides

science24 days ago•6 min saved

New Iron Hydrates Hint at Hidden Water Deep in Earth's Mantle

Researchers using laser-heated diamond anvils identified two iron oxyhydroxide minerals that can trap water under deep-mantle conditions near the core–mantle boundary, suggesting Earth’s water cycle may extend into the deep interior and could be released back to the surface through mantle dynamics, though the exact amounts and transport timing remain uncertain.

via ScienceAlert|

#core-mantle-boundary #iron-oxyhydroxides #mantle

science1 month ago•55 min saved

AI Maps Six Hidden Regions Beneath Earth's Core–Mantle Boundary

A deep-learning classifier analyzed about 2 million seismic waveforms from roughly 5,000 magnitude-6+ earthquakes, identifying around 174,929 faint PKP precursor signals and revealing six previously undocumented strong‑scattering regions (B1–B6) at the core–mantle boundary. The study, published in Journal of Geophysical Research: Solid Earth (2026), suggests deeper mantle heterogeneities and could refine models of Earth's deep interior; the approach combines AI-driven detection with iterative human validation, and potential origins include subducted slabs or partial melting, though exact causes remain uncertain.

via Yahoo|

#ai #core-mantle-boundary #deep-heterogeneities

science1 month ago•58 min saved

AI-Driven Seismic Scan Reveals Six Hidden Deep-Earth Patches

A study using deep learning to analyze over 2 million earthquake records (1990–2024) identified about 174,900 PKP precursor signals and mapped six previously undocumented deep-mantle regions (B1–B6) near the core–mantle boundary, suggesting large, connected pockets of heterogeneity likely tied to ancient subducted material and thermochemical piles. The findings, published in the Journal of Geophysical Research: Solid Earth, refine our view of mantle dynamics and could impact our understanding of earthquakes, volcanism, and tectonics, while calling for higher-resolution follow-up studies.

via Yahoo|

#core-mantle-boundary #deep-mantle #machine-learning

science1 month ago•7 min saved

AI Reveals Six Hidden Deep-Mantle Structures Beneath Earth

AI-assisted analysis of more than 2 million earthquake recordings (1990–2024) identified 174,929 high‑quality PKP precursor signals and unveiled six previously undocumented deep-mantle zones (B1–B6) near the core–mantle boundary. The expanded dataset shows that these small-scale structures may connect into larger belts, likely shaped by subduction and thermochemical processes, with broad implications for mantle convection, volcanic activity, and Earth's magnetic field. The researchers call for higher‑resolution, multi‑wave studies to refine deep-Earth models.

via ScienceAlert|

#core-mantle-boundary #deep-mantle #machine-learning

science2 months ago•11 min saved

Hawaii rocks reveal a faint signal from Earth’s core crossing into the mantle

A 2025 ruthenium-isotope study of Hawaiian basalts finds a small core-derived signal in the mantle, suggesting material from Earth’s core can cross the core–mantle boundary and reach surface plume systems. This supports long-standing ideas of core–mantle exchange but does not show direct transport of gold or imply a large, exploitable flux. The finding adds nuance to the notion that the core is sealed, and while it aligns with estimates that the core holds most of Earth’s gold (enough, in old calculations, to coat continents in a 0.5 m layer), the signal is tiny and more measurements from Hawaii and other hotspots are needed to gauge its extent.

via Space Daily|

#core-mantle-boundary #geochemistry #hawaii

science3 months ago•12 min saved

Tiny core signal found in Hawaiian lava shows Earth's interior isn't sealed

Geochemists detected a core-like ruthenium-100 isotope signature in Hawaiian basalts, indicating trace amounts of Earth’s core material mix into the mantle plume feeding Hawaii’s volcanism. While this supports the idea that the core is not fully isolated from the mantle, the signal is tiny and gold itself was not enriched in the rocks, so there’s no mining implication. The finding suggests a leaky core–mantle boundary and raises questions about whether similar core-derived signatures appear in other deep-mantle plumes.

via Space Daily|

#core-mantle-boundary #core-material-mixing #gold

science3 months ago•6 min saved

Core-reflected seismic pulse may have nudged Japan after the 2011 megathrust quake

Analysis of Japan’s GNSS data from the 2011 magnitude-9.0 Tōhoku earthquake suggests a seismic wave returning from the core–mantle boundary (ScS) may have triggered a broad, millimeter-to-centimeter fault slip across a large plate boundary, producing tiny but detectable eastward shifts and an energy release comparable to a magnitude 7.5 quake, potentially the first known example of wave-triggered slip from a core-reflected seismic wave; findings published in Science.

via ScienceAlert|

#core-mantle-boundary #fault-slip #gnss

astronomy5 months ago•7 min saved

Mercury’s Hidden Diamond Layer Redefines Its Inner Story

A study suggests Mercury might contain a 9–11 mile (15–18 km) thick diamond layer at the core–mantle boundary, formed as carbon-rich material crystallized during magma-ocean cooling and core solidification, with sulfur facilitating diamond stability; such a layer could affect heat flow and Mercury’s magnetic field, but the idea awaits confirmation from future missions.

via The Daily Galaxy|

#astronomy #carbon #core-mantle-boundary

science6 months ago•7 min saved

Earth’s Deep Mantle Giants Reshape the Height Chart: 1,000-km Structures Beneath Africa and the Pacific

A Utrecht University study using full-planet normal-mode seismology reveals two Large Low Shear Velocity Provinces beneath Africa and the central Pacific, rising about 1,000 kilometers from the core–mantle boundary. These thermochemical structures, billions of years old, appear to anchor mantle flow and influence surface tectonics; they are not surface mountains, but if placed at the surface they would extend high into the atmosphere, effectively redefining what counts as Earth's tallest feature.

via The Daily Galaxy|

#core-mantle-boundary #earth-interior #llsvp

science7 months ago•36 min saved

Deep-Earth Phase Shift Behind Mysterious Gravity Glitches

NASA/DLR GRACE data showed a deep mantle gravity anomaly from 2006–2008 stretching across the eastern Atlantic. Scientists traced the signal to a phase transition in bridgmanite near the core–mantle boundary, where mineral structure changes redistribute mass and alter density. This deep-seated gravitational anomaly, not fully explained by surface water, helps explain previous geomagnetic-field–related gravity fluctuations and will guide models of core–mantle dynamics and mantle convection.

via Yahoo|

#bridgmanite #core-mantle-boundary #grace

science1 year ago•2 min saved

Scientists Detect Massive Internal Shift Within the Earth

Scientists analyzing data from NASA's GRACE satellites discovered evidence of a massive shift deep within the Earth's interior near the core-mantle boundary, possibly caused by changes in mantle minerals like perovskite, which may have influenced Earth's magnetic field and caused a geomagnetic jerk around 2007. They plan to use data from the follow-up GRACE-FO mission to further investigate these deep Earth processes.

via Futurism|

#core-mantle-boundary #earths-interior #geomagnetic-field

science2 years ago•3 min saved

"New Insights into Earth's Mysterious D” Layer from Ancient Ocean Relics"

A new study suggests that Earth's mysterious D” layer near the core-mantle boundary may have formed from a magma ocean created by a massive impact in the planet's early days. This layer's unique composition and heterogeneity could be explained by the presence of iron-magnesium peroxide, formed from water in the magma ocean, which has a strong affinity for iron and contributes to the D” layer's distinct geophysical features.

via SciTechDaily|

#core-mantle-boundary #d-layer #earth

earth-science2 years ago•2 min saved

Unveiling Earth's Mysterious New Layer: A Changing Core Phenomenon

New research reveals that water from Earth's surface can penetrate deep into the planet, causing a chemical interaction at the core-mantle boundary. This interaction creates a thin layer of material, known as the 'E prime' layer, which has puzzled geologists for decades. The study shows that water reacts with silicon in the core, forming silica and creating a top core layer rich in hydrogen. The presence of this layer affects the density and seismic speeds of the outer core, potentially impacting Earth's magnetic field and the global water cycle. The findings suggest a more dynamic core-mantle interaction and a complex water cycle within the planet.

via ScienceAlert|

#chemical-interaction #core-mantle-boundary #earth-science

earth-science2 years ago•5 min saved

Unyielding Iron Oxide: Surviving Earth's Harshest Conditions

Scientists have long been intrigued by the ultralow velocity zones (ULVZs) near the core-mantle boundary (CMB) of the Earth, but their composition and behavior have remained a mystery. A recent study led by Caltech researchers has provided evidence that these regions, which slow down seismic waves, may be composed of solid iron oxide. The study used experiments to determine the temperatures and pressures at which iron oxide transitions from a solid to a liquid state, and found that it remains solid even at extreme conditions similar to those at the CMB. The findings shed light on the complex nature of the Earth's deep interior and its influence on geological processes.

via Phys.org|

#core-mantle-boundary #earth-science #earths-interior