Tag

Mantle

All articles tagged with #mantle

science15 hours 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

science7 days ago•19 min saved

Hidden mantle blobs could rewrite Earth's tectonic story

Seismologists using high-resolution full-waveform inversion on earthquake data detected large, anomalous pockets in the lower mantle beneath the Pacific, visible as regions where seismic waves move unusually fast or slow. These “sunken worlds” may be remnants of ancient plates or other mantle materials, challenging traditional ideas about subduction and plate evolution. A ETH Zurich–Caltech team notes the exact composition is unclear and more data and methods (including EM signals and mineral physics) are needed, but the findings could require updates to models of mantle convection and heat transfer. The study appears in Scientific Reports.

via Earth.com|

#full-waveform-inversion #geophysics #mantle

science8 days ago•7 min saved

Mantle on the Map: Two Remote Spots Where Earth's Deep Rock Pops Up

Two remote locations reveal mantle rocks at the surface: Macquarie Island, where ongoing plate motion brings oceanic mantle-derived rock to the surface at an active boundary, and Gros Morne National Park’s Tablelands, where an ancient ophiolite block places upper-mantle rocks atop continental crust—each site representing different tectonic settings and timescales, with Macquarie remaining remote and heavily bio-secured and Gros Morne playing a historic, foundational role in plate tectonics research.

via Indian Defence Review|

#gros-morne #macquarie-island #mantle

science21 days ago•5 min saved

Deepest Mantle Rock Recovered Off Atlantic, Yet Moho Remains Uncrossed

A team aboard the JOIDES Resolution drilled 1,268 meters near the Lost City hydrothermal field, retrieving abyssal peridotite and harzburgite—the deepest mantle-like rock ever recovered—without crossing the crust–mantle Moho boundary. The findings advance understanding of the upper mantle and serpentinization, but the mission ended not from rock failure or depth limits; it was due to the operations window ending, and funding has since been cut for further mantle sampling, potentially slowing progress in deep-mantle research.

via Indian Defence Review|

#deep-sea-drilling #lost-city #mantle

science22 days ago•5 min saved

Deep Mantle Giants Have Shaped Earth’s Magnetic Field for Millions of Years

Geologists report that two massive, buried mantle anomalies called large low-shear-velocity provinces (LLSVPs) have modulated Earth's magnetic field for about 265 million years by creating temperature- and density-driven flow differences that alter the outer-core liquid iron; computer simulations show only models including LLSVPs reproduce observed magnetic irregularities, with implications for ancient continental configurations and climate.

via WIRED|

#geodynamo #llsvps #magnetic-field

earth-science22 days ago•7 min saved

Hot Mantle Blobs May Shape Earth's Magnetic Field

Seismic data and geodynamo simulations indicate two hot “Blob” regions at the core–mantle boundary heat the surrounding mantle less evenly, insulating the outer core and shaping long-lived, longitudinal magnetic-field patterns, helping explain Earth's magnetic stability over hundreds of millions of years.

via ScienceAlert|

#core #earth-science #geodynamo

science23 days ago•3 min saved

Two Hot Mantle Blobs Steer Earth's Magnetic Field

A Nature Geoscience study and simulations suggest two enormous, hot blobs at the base of Earth’s mantle influence heat flow to the outer core, sustaining the geodynamo and stabilizing Earth’s magnetic field for millions of years.

via Gizmodo|

#deep-earth #earths-magnetic-field #geodynamo

planet-earth24 days ago•58 min saved

Iron-rich mantle 'mega-blob' beneath Hawaii may power the hotspot

A new study combining P- and S-waves finds a massive, iron-rich, solid mega-ultralow velocity zone beneath Hawaii, which could anchor and fuel the Hawaiian hotspot by concentrating heat and guiding mantle flow.

via Live Science|

#hawaii #hotspot #mantle

science1 month ago•28 min saved

Earth’s crust drips beneath central Türkiye, reshaping the Konya Basin

Satellite data and seismic evidence confirm a multi‑stage lithospheric dripping beneath Türkiye’s Central Anatolian Plateau: unusually dense lower lithosphere sinks into the mantle, deepening the Konya Basin, and later detaches allowing surface rebound as the weight is shed, linking deep Earth processes to observed subsidence amid plateau uplift.

via Earth.com|

#geology #konya-basin #lithosphere

science2 months ago•4 min saved

Early Earth's Deep Mantle Held More Water Than Previously Believed

New research indicates that during Earth's early molten phase, vast amounts of water were stored deep within the mantle, particularly in the mineral bridgmanite, which acted as a microscopic water reservoir. This hidden water played a crucial role in Earth's evolution, helping it transition from a fiery planet to a habitable world by facilitating internal circulation and surface water formation.

via SciTechDaily|

#bridgmanite #early-earth #earths-water

science5 months ago•6 min saved

Scientists Confirm Lava Tubes and Underground Tunnels on Venus

Scientists propose that a 'glass ceiling' in Venus' mantle traps heat and causes slow, shifting currents, which may explain the planet's mysterious crown-shaped coronae, by creating a reservoir of warm, non-melting material that influences surface features.

via Space|

#coronae #geology #mantle

science5 months ago•4 min saved

Scientists Discover Rare Nickel-Rich Diamonds Revealing Deep Earth Secrets

Scientists discovered two diamonds from South Africa containing contrasting inclusions that reveal new insights into deep Earth chemistry, showing that oxidized and reduced materials can coexist at depths of 280-470 km, challenging previous assumptions about mantle oxidation states.

via Live Science|

#diamonds #geochemistry #inclusions

science6 months ago•8 min saved

Scientists Uncover New Insights into Himalayas' Geology

Scientists have challenged the long-held theory that the Himalayas are supported solely by a doubled crust beneath the mountain range. New research indicates that a layer of mantle material, sandwiched between the crusts of the Indian and Asian plates, provides the necessary buoyancy and strength to sustain the Himalayas' height, reshaping our understanding of Earth's geological structure.

via Live Science|

#crust #earths-layers #geology

cryptocurrency6 months ago•3 min saved

Mantle's Rapid Rise and Future Outlook Amid Whale Activity and Sector Growth

Mantle (MNT) has surged 15% to $1.36 driven by whale accumulation, a new staking partnership with Bybit, increased open interest, and exchange outflows, indicating strong short-term bullish momentum. However, heightened leverage and profit-taking by large investors could lead to increased volatility, making the sustainability of this rally uncertain.

via AMBCrypto|

#cryptocurrency #mantle #mnt

science7 months ago•3 min saved

Massive Underground 'Fortresses' and Blobs May Trigger Future Volcanic Eruptions and Extinctions

Geologists have discovered massive, ancient 'fortresses' in the Earth's mantle, located 1,800 miles below the surface, challenging traditional models of mantle convection and offering new insights into Earth's internal dynamics and geological processes.

via The Daily Galaxy|

#earths-interior #geology #llsvps