8legs: Geology

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#1 out of 427.78%

5h ago

New 3D mantle heat maps reveal strong east-west variations beneath Greenland that affect ice movement.
Basal heat flux from the mantle is linked to where the ice sheet melts from below.
The team created a probabilistic model that merges seismic data, gravity, and heat flow.
Findings help explain why satellite data show uneven gravity and height changes across the ice sheet.
Researchers linked deep-Earth patterns to surface changes to improve sea-level forecasts.
The study uses a joint inversion of multiple datasets to reduce uncertainties.
Greenland lost about 195 billion short tons of ice in 2023, per Copernicus data.
Deep-heat patterns align with a hotspot track and mantle plume evidence beneath Greenland.
The research aims to separate ocean- and atmosphere-driven changes from solid-Earth effects.
Published in the Proceedings of the National Academy of Sciences, advancing climate-tectonics understanding.

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#2 out of 4

1d ago

Researchers link Caledonian belt gold deposits to mantle melting, not just crustal processes.
Mass spectrometry of ancient ore fluids reveals helium isotopes from the Earth's mantle.
Helium signatures indicate deep mantle origins across deposits of varying size and age.
Study suggests mantle-derived heat drives circulation of gold-rich fluids.
Findings published in Geology support a mantle-related origin for major mineral systems.
Leeds and Tasmania researchers contributed to the study and co-authored the paper.
UKRI and Scotgold Resources funded the research.
The Caledonian belt stretches from the Appalachians to northern Norway, formed 490-390 million years ago.
UK gold production figure cited for context: 72,000 kg in December 2023.
Gold applications include electrical contacts and aerospace electronics.

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#3 out of 4

1d ago

A seismic study found an unusually thick rock layer (about 20 km) beneath Bermuda, extending beneath the island.
Researchers say the layer may be mantle-derived material emplaced during ancient volcanism and later frozen in place.
The team used seismic data from Bermuda to image Earth down to about 50 kilometers beneath the island.
Is Bermuda’s high-relief crust linked to a long-standing mystery of the island’s swell, not active surface volcanism.
The researchers say Bermuda’s mantle-related layer might explain why the area remains elevated compared to nearby ocean floor.
The study contributes to understanding extreme mantle processes in oceanic regions beyond Bermuda.
Scientists compare Bermuda’s structure with other oceanic regions to see if similar layers exist elsewhere.
The researchers published their findings in the Geophysical Research Letters on Nov. 28.
Experts cited in the report say Bermuda’s unique geology might shed light on how Earth’s crust deforms in extreme settings.
The study used seismic signals from distant earthquakes to map underground structures near Bermuda.

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#4 out of 4100.00%

8h ago

New experiments show Earth’s lower mantle may store much more early water than previously believed, reshaping ideas about habitability.
Bridgmanite, the mantle’s most abundant mineral, can contain hundreds to nearly two thousand parts per million of water by weight.
Temperature, not pressure or composition, largely governs how much water bridgmanite stores as the mantle cools.
Magma-ocean crystallization models show the lower mantle could hold five to a hundred times more water than earlier estimates.
Early in Earth’s history, cooling magma oceans allowed bridging and crystallization to lock water into bridgmanite.
The study used NanoSIMS and atom probe tomography to confirm water is integrated into bridgmanite’s crystal structure.
If true, Earth’s deep-water reservoir could slowly resupply surface oceans and influence climate over geologic time.
Results may help explain why the upper mantle is relatively dry while the transition zone holds more water today.
The research suggests a deep-water reserve could recur in exoplanets during their magma-ocean phases, informing planetary habitability.

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