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Mantle

All articles tagged with #mantle

Yellowstone's Heat Source Traced to Shallow Mantle, New Study Finds
earth-science1 day ago

Yellowstone's Heat Source Traced to Shallow Mantle, New Study Finds

A new 3D model of Yellowstone and the Eastern Snake River Plain suggests tectonic forces within the lithosphere drive magma generation and migration from the shallow mantle (upper asthenosphere) into a complex plumbing system, rather than a deep mantle plume powering a single giant chamber. This tectonically controlled magma movement could improve eruption forecasting and hazard assessment for the park’s massive caldera, whose last major eruption occurred about 630,000 years ago and is not expected imminently.

via Gizmodo|
#earth-science#magma#mantle
Earth’s Deep Mantle Giants Reshape the Height Chart: 1,000-km Structures Beneath Africa and the Pacific
science15 days ago

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
Mantle's Hidden Ocean Could Rewrite Earth's Water Story
science15 days ago

Mantle's Hidden Ocean Could Rewrite Earth's Water Story

Scientists report a vast water reservoir stored in the mineral ringwoodite about 700 kilometers beneath Earth's surface, forming a deep 'ocean' three times larger than all surface oceans. The finding, supported by seismic data from thousands of sensors and high-pressure lab experiments, challenges the idea that Earth's water came mainly from comets and suggests interior sources could help regulate surface oceans and geologic activity.

via The Daily Galaxy|
#mantle#origin-of-earths-water#ringwoodite
Ancient Mantle Islands Found Deep Inside Earth Redefine Mantle Dynamics
science1 month ago

Ancient Mantle Islands Found Deep Inside Earth Redefine Mantle Dynamics

Two continent-sized regions deep in Earth’s mantle, called Large Low Seismic Velocity Provinces (LLSVPs), lie about 1,200 miles below the surface and rise roughly 620 miles, making them far larger than any surface mountain. They’re hotter and ancient, likely stable for hundreds of millions of years, and their existence suggests the mantle is not as well-mixed as previously thought. Seismic analyses show they dampen waves less than surrounding slabs, a property linked to unusually large mineral grains, reshaping ideas about mantle convection and the origin of mantle plumes.

via Earth.com|
#continents#earth-interior#llsvps
Deep-Earth Phase Shift Behind Mysterious Gravity Glitches
science1 month ago

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
Hidden mantle blobs could rewrite Earth's tectonic story
science1 month ago

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
Mantle on the Map: Two Remote Spots Where Earth's Deep Rock Pops Up
science1 month ago

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
Deepest Mantle Rock Recovered Off Atlantic, Yet Moho Remains Uncrossed
science2 months ago

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
Deep Mantle Giants Have Shaped Earth’s Magnetic Field for Millions of Years
science2 months ago

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’s crust drips beneath central Türkiye, reshaping the Konya Basin
science2 months ago

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
Early Earth's Deep Mantle Held More Water Than Previously Believed
science3 months ago

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