Tag

Mantle Dynamics

All articles tagged with #mantle dynamics

earth-and-climate1 month ago•6 min saved

Antarctica’s Hidden Gravity Hole Points to Deep-Earth Roots of Its Ice Sheets

Scientists mapped a gravity low beneath Antarctica caused by extremely slow deep-Earth rock movements over tens of millions of years. The anomaly strengthened between about 50 and 30 million years ago, coinciding with the emergence of Antarctica’s vast ice sheets, suggesting mantle dynamics may have helped shape surface ice and sea level. Using earthquake data like a planetary CT scan and computer models, researchers reconstructed the gravity hole’s history and plan to explore how these interior processes influence climate.

via ScienceDaily|

#antarctica #earth-and-climate #earthquakes

earth-science1 month ago•15 min saved

Antarctica’s Gravity Hole Grows Stronger, Hinting at Deep Mantle Shifts

Scientists used earthquakes and geophysical data to reconstruct Earth’s interior and map a gravity hole beneath Antarctica that began weakening but has grown stronger over roughly 50–30 million years, driven by competing mantle flows (cold, sinking material beneath and hotter, rising material above). This amplified mass deficit alters the geoid and regional sea-level dynamics, offering clues about ice-sheet stability and climate-related sea-level changes, though the exact future impact remains uncertain.

via Gizmodo|

#antarctica #earth-science #geophysics

science2 months ago•4 min saved

Underground Sinking Unveils Hidden Forces Shaping Turkey’s Central Plateau

Scientists find that a dense portion of the lower lithosphere beneath Turkey’s Konya Basin is slowly sinking into the mantle via multi-stage lithospheric dripping, causing persistent subsidence while the surrounding Central Anatolian Plateau uplifts. The conclusion, drawn from satellite data and seismic imaging and supported by lab models, explains long-term basin deepening and regional crustal dynamics.

via The Daily Galaxy|

#central-anatolian-plateau #konya-basin #lithospheric-dripping

science5 months ago•4 min saved

Scientists Discover Enormous Hole in Indian Ocean

Scientists have uncovered new insights into the Indian Ocean Geoid Low, the largest gravity hole on Earth, linking it to mantle processes such as sinking slabs and rising plumes originating from deep within Earth's mantle, which have evolved over millions of years and are influenced by interactions with the African hotspot and mantle structures like the LLSVP.

via Indian Defence Review|

#earths-interior #gravity-anomaly #indian-ocean-geoid-low

science7 months ago•4 min saved

Revised Timeline Reveals True History of Earth's Continent Formation

Recent research indicates Earth's continents formed much earlier than previously believed, around 4.3 billion years ago, driven by active tectonic processes and mantle plumes during the Hadean, challenging the idea of a stagnant early Earth and providing new insights into crust formation and mantle recycling.

via Indian Defence Review|

#early-earth #earths-continents #hadean-eon

science9 months ago•3 min saved

Scientists Unveil New Simulation of Earth's 4.5 Billion Year History

Scientists used a new computer simulation called the Bambari model to recreate Earth's early molten state 4.5 billion years ago, revealing how layered structures and chemical patterns formed, which influence today's mantle features and volcanic activity, and providing insights into the evolution of other planets.

via The Daily Galaxy|

#early-earths-chemistry #earths-formation #mantle-dynamics

science2 years ago•2 min saved

"Uncovering an Ultra-Low Velocity Zone Beneath the Himalayas"

Researchers from Yale University have discovered an ultra-low velocity zone (ULVZ) beneath the Himalayas, 1,800 miles beneath Earth's surface, using seismic waves to study the structure just above the boundary between Earth's rocky mantle and metallic core. The ULVZ may have been formed by subducted material that had sunk from the surface down to the core-mantle boundary, providing direct evidence for subducted slabs playing a role in driving flow at the base of the mantle. This discovery sheds light on the poorly understood composition and role of ULVZs in mantle dynamics, offering insights into the interconnected processes of the deep mantle and their influence on tectonic plates and surface features.

via Phys.org|

#geology #himalayas #mantle-dynamics