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Plate Tectonics

All articles tagged with #plate tectonics

Subduction's Hidden Role in Earth's Oxygen-Breathing Atmosphere
science20 hours ago

Subduction's Hidden Role in Earth's Oxygen-Breathing Atmosphere

A new study ties Earth’s oxygen buildup to the subduction of carbon and sulfur: when subduction runs cooler, more C and S are carried into the mantle, later returning to the surface via volcanism and scavenging oxygen; warmer subduction releases more of these elements toward the surface, boosting atmospheric O2. The timing matches major oxygenation events (Great Oxygenation ~2.4–2.0 Ga and later boosts) and tracks with the cooling Earth and supercontinent cycles (Columbia, Gondwana, Pangaea). The findings suggest oxygen levels result from a complex interplay of biology, deep Earth chemistry, and plate tectonics.

via Ars Technica|
#atmosphere#earth-science#geology
Online Tool Rewinds Earth's Map to 320 Million Years Ago
science6 days ago

Online Tool Rewinds Earth's Map to 320 Million Years Ago

Researchers at Utrecht University have built Paleolatitude.org, an online platform that lets you enter any modern location and see its estimated latitude at different times up to 320 million years ago, using refined tectonic reconstructions, magnetic rock data, and dating techniques to map continental movement—and including smaller plates and lost landmasses. The tool supports studies of past climates, fossils, biodiversity, and mass extinctions, with plans to extend back further in time.

via The Daily Galaxy|
#biodiversity#climate-history#paleogeography
Ancient Subduction Patterns Explain Rare Earth Deposits, Guiding Future Exploration
science8 days ago

Ancient Subduction Patterns Explain Rare Earth Deposits, Guiding Future Exploration

A two-billion-year pattern shows ancient subduction enriched the mantle with rare earth ingredients, and later melting formed the deposits. This mantle fertilization explains why rare earth deposits cluster where they do and why there is a long time lag between enrichment and mineralization, providing a new framework to guide future exploration of critical metals for modern tech.

via Indian Defence Review|
#carbonatites#mantle-fertilization#plate-tectonics
Geochemical Clues Hint Africa May Be Forming a New Tectonic Boundary
earth-science14 days ago

Geochemical Clues Hint Africa May Be Forming a New Tectonic Boundary

An international Frontiers in Earth Science study found elevated helium isotope ratios and mantle-like CO2 in samples from the Kafue Rift in Central Africa, suggesting mantle fluids are reaching the crust and potentially signaling the early stages of a new plate boundary that could eventually split sub‑Saharan Africa. The result is preliminary, but if confirmed it could open geothermal and other resource opportunities, with follow-up research planned across the Southwest African Rift System.

via Gizmodo|
#africa#earth-science#geochemistry
From Sea Floor to Sea Stacks: Unveiling the Twelve Apostles' Formation
science23 days ago

From Sea Floor to Sea Stacks: Unveiling the Twelve Apostles' Formation

New research uses high‑resolution mapping and fossil analysis to pin down the Twelve Apostles’ formation: Miocene seas deposited limestone about 14 to 8.6 million years ago (with the Gellibrand Marl around 14–15 Ma and Port Campbell Limestone forming later), followed by crustal compression and tilting that began around 8.6 Ma. The dramatic sea stacks took their present form in the last 20,000–23,000 years as sea levels rose after the last glaciation, with ongoing erosion causing collapses (one in 2005, another in 2009) and the landscape continuing to evolve as a climate record from the Miocene.

via ScienceAlert|
#climate-history#geology#plate-tectonics
Where Was Your Backyard 320 Million Years Ago? A New Tool Maps Earth's Drift
science25 days ago

Where Was Your Backyard 320 Million Years Ago? A New Tool Maps Earth's Drift

Paleolatitude.org now features a global 320-million-year paleogeographic model with updated paleomagnetic data, letting users trace any location’s latitude through continental drift, export results, and upload data for bulk paleolatitude calculations. Researchers illustrate its use by reconstructing late Jurassic biodiversity gradients and mapping a Dutch fossil site to ancient latitudes near today’s Arabia, with plans to extend the model back to the Cambrian to study biodiversity resilience through deep time.

via ScienceAlert|
#biodiversity#paleogeography#paleolatitude
Pacific Northwest Subduction Zone Breaks Apart, One Tear at a Time
science27 days ago

Pacific Northwest Subduction Zone Breaks Apart, One Tear at a Time

A Science Advances study using high‑resolution seismic imaging from the CASIE21 expedition shows the Cascadia subduction zone off Vancouver Island tearing apart in stages, with a main fault dropping about five kilometers and smaller microplates forming as the Juan de Fuca plate gradually detaches. This episodic, piecewise termination clarifies how such zones die and will help refine seismic hazard models, though it does not indicate an imminent change in regional earthquake risk.

via Indian Defence Review|
#cascadia#earthquake-science#juan-de-fuca
Pacific Ocean Drains Heat Faster, Revealing 400 Million-Year Cooling Imbalance
science29 days ago

Pacific Ocean Drains Heat Faster, Revealing 400 Million-Year Cooling Imbalance

A 400-million-year computer-model study shows Earth's cooling is uneven: the Pacific hemisphere has shed about 50 Kelvin more heat than Africa, driven by rapid heat loss through the thinner seafloor and the vast Pacific Ocean, while continental regions trap heat; the findings illuminate a long-standing hemispheric heat disparity rooted deep in Earth's tectonic history.

via Indian Defence Review|
#earth-science#geophysics#heat-flow
Africa’s Rift Heads Toward Split: First Live Necking Point Confirmed
science1 month ago

Africa’s Rift Heads Toward Split: First Live Necking Point Confirmed

Scientists report that the Turkana Rift in East Africa has thinned its crust to about 12.7 km along the rift axis, marking the necking phase—the last stage before continental breakup. The crust was thicker (about 35 km) at the flanks, and two prior rifting episodes weakened the region, leading to a faster extension of roughly 1.2 mm/year. If this trajectory continues, full separation and a new ocean basin could form in 5–10 million years. This study offers the first real-time observation of necking in an active rift and provides insight into both Africa’s geologic evolution and its fossil record.

via The Daily Galaxy|
#continental-breakup#east-african-rift#necking-phase
Yellowstone Magma Flows as a Broad, Slow River Beneath North America
science1 month ago

Yellowstone Magma Flows as a Broad, Slow River Beneath North America

A new Science study argues Yellowstone’s volcanism is driven by a broad, slow-moving flow of hot rock beneath North America, forming a connected magma system rather than a single deep chamber, with eastward mantle motion tied to Farallon Plate remnants—reshaping how scientists understand eruptions, which remain unpredictable and not overdue.

via The Daily Galaxy|
#magma#mantle-flow#plate-tectonics
Magnetic Clues Reframe the Americas’ Collision Timeline
science1 month ago

Magnetic Clues Reframe the Americas’ Collision Timeline

New magnetic data from Colombian volcanic rocks shows that the collision between Central and South America began well before the previously accepted timeline, mainly during the Oligocene to middle Miocene, implying a gradual deformation rather than a late, abrupt event and potentially shifting the timing of the Isthmus of Panama with broad implications for ocean circulation, climate, and biodiversity.

via Indian Defence Review|
#geology#magnetic-evidence#miocene