All articles tagged with #tectonics
New research published in Science argues Yellowstone's magma system is heated by tectonic forces within the crust—driven by lithospheric stretching and the sinking Farallon slab—rather than by a deep mantle plume, a shift that could alter eruption models and future forecasts.
New research suggests Yellowstone's magma plumbing is heated by tectonics and lithospheric stretching rather than a deep mantle plume, with competing forces under the crust opening pathways from mantle to the caldera. The finding could improve eruption forecasting and help explain other caldera systems.
A new study finds Mount Etna's lava originates from a melt in the mantle's low-velocity zone and rises through a tectonically complex zone at the Africa-Eurasia boundary, producing early silica-rich lava and later alkali-rich lava, suggesting Etna represents a previously unclassified form of volcanism that could be more widespread than scientists previously thought.
Seismic data reveal the Turkana Rift in East Africa is thinning far more than previously thought, with the crust at the rift center about 13 km thick compared with well over 35 km away, signaling an advanced necking stage toward eventual continental breakup and ocean formation. The process began millions of years ago and will take millions more to unfold, while subsidence and sedimentation here also help preserve an unusually rich fossil record, influencing interpretations of human evolution and past climates.
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.
In Ethiopia’s Afar region, a triple-junction rift is slowly pulling Africa apart, providing a rare window into continental rifting as mantle plumes pulse and plates shift at millimeters per year. Scientists study Erta Ale’s lava lake and fossil finds like Paranthropus to understand deep geology, while concluding that a new ocean may form only over millions of years and that the region offers invaluable insights into Africa’s geological history.
Scientists mapped the King’s Trough, a 500+ km underwater canyon in the North Atlantic, and determined it formed over millions of years by the slow separation of the European and African plates via a tectonic 'zipper,' aided by unusually thick, hot crust from the Azores mantle plume. The finding, reported after METEOR expedition data and high‑resolution sonar, links deep mantle processes to surface tectonics and reshapes how we think about underwater canyon formation.
Geologists propose that a dense chunk at the base of the Uinta Mountains’ lithosphere ‘dripped’ into Earth’s mantle, temporarily pulling the range downward and allowing the Green River to cut perpendicularly across the mountains to join the Colorado River, forming the Canyon of Lodor. Seismic imaging reveals a ~200 km-deep, cold chunk and thinner crust beneath the range; after the drip broke free about 2–5 million years ago, the mountains rebounded, the canyon solidified, and the Green River became a Colorado River tributary, reshaping North America’s continental divide.
A computer-model study links the Wallace Line to a 35-million-year-old continental collision and subsequent climate swings, explaining why Bali’s Asian fauna abruptly shifts to Australian forms on Lombok and nearby islands—and how tectonics and climate history have shaped biodiversity across the region, with nearby lines like Weber’s and Lydekker’s also noted as regional boundaries.
New research links the shift from humid to dry conditions in East Africa with faster fault movement in the East African Rift, measured at about 0.17 millimeters per year of extra movement on top of the regional 6.35 millimeters per year baseline. The dewatering of lakes after the African Humid Period reduces crustal pressure, while a nearby magma chamber may receive more melt, increasing tectonic activity around Lake Turkana and potentially accelerating continental breakup; scientists are expanding the study to Lake Malawi for broader climate-tectonics insight.
A new study shows that the ancient Tethys Ocean helped shape Central Asia’s terrain long before the Himalayas, with its retreat reactivating old fault lines and uplifting ranges across present-day Kazakhstan, Uzbekistan and western China, challenging climate- and mantle-driven views of mountain building.
Central Australia’s Finke River (Larapinta) is estimated at 300–400 million years old, making it one of the oldest rivers on Earth. Its cross-axial drainage allowed it to cut through rising MacDonnell Ranges as the landscape formed, aided by Australia’s long tectonic stability; radioactive dating of rocks supports the river’s ancient timeline.
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.
Scientists have discovered a new submerged microcontinent beneath the Davis Strait, challenging traditional views of Earth's landmass formation and offering new insights into microcontinent survival and separation processes, especially in tectologically simple regions.
China is drilling a 6-mile-deep borehole in the Taklimakan Desert to study Earth's crust, tectonics, and ancient geological records, pushing the limits of drilling technology and expanding understanding of Earth's interior.