Articles tagged with Earth Crust
Researchers propose a thermochemical mantle plume formation process for the Ontong Java Plateau, contradicting previous hypotheses. The model explains spatial variations in crustal thickness and lava composition across the plateau.
Southwest Research Institute scientists modeled the early impact history of Earth, finding that asteroid impacts fractured the crust and generated hydrothermal systems. These environments could have provided a suitable setting for the origin and evolution of early life on Earth.
A new study suggests that the rise of continents may have regulated boron levels in ancient oceans, creating a stable environment for life to emerge. The growth of granite-rich continental crust helped stabilize boron concentrations, making it available for use by early life forms.
A new study finds that Antarctica's gravity hole formed as a result of slow rock movements deep under the Earth's surface, which overlapped with major changes in the continent's climate system. The study suggests that future research could reveal how the shifting gravity may have encouraged the growth of ice sheets.
A team of scientists discovered the King's Trough Complex, a colossal submarine canyon off Portugal's coast, formed by tectonic processes and hot mantle material. The structure extends over 500 kilometers, with Peake Deep as one of the deepest points in the Atlantic Ocean.
Tulane researchers discovered that an area of the African tectonic plate, previously thought to be weak, is now resisting deformation due to dehydration 80 million years ago. This process strengthened the plate and made it more resistant to future breakup.
Researchers from the University of Göttingen have identified oxygen isotopes in 'cherts' as indicators of heat flow on early Earth. The study reveals that cherts record paleo-heat flow on the Shatsky Rise oceanic plateau, providing insights into the conditions on the Earth's surface up to 3.5 billion years ago.
Researchers analyzed atmospheric pressure waves from a massive South Pacific volcanic eruption to determine the speed of seismic waves in Alaska's upper crust. The study provided valuable information on subsurface material properties, such as hardness, which controls seismic velocity.
A plume of hot rocks from the Earth's mantle created a conveyor belt for heat to rise, leading to the gradual uplift of the Arabian Peninsula and the creation of a land bridge between Asia and Africa. This event enabled the early ancestors of elephants, giraffes, and humans to roam between the two continents.
Researchers found that Earth's first crust, formed 4.5 billion years ago, likely had chemical features similar to modern continental crust, rewriting the geological timeline. This suggests the distinctive chemical signature of continents was established at the beginning of Earth's history.
Researchers confirm multi-stage lithospheric dripping as cause of basin subsidence in Central Anatolian Plateau. Laboratory experiments and satellite data reveal intricate connection between plateau uplift and basin formation events.
A new imaging technique allows scientists to visualize the Earth's rocky interior using GPS data, revealing details about the planet's crust and mantle. This method has the potential to improve earthquake predictions by combining it with other techniques.
A recent study from the University of Copenhagen found that the oldest Scandinavian bedrock originated in Greenland approximately 3.75 billion years ago. The discovery provides new insights into the formation of continents and the emergence of life on Earth, highlighting the importance of fixed continents for supporting life.
A team of researchers from Japan found that water enhances energy dispersion and reduces elastic moduli in rocks, leading to increased seismic wave attenuation. The study suggests the oceanic asthenosphere must contain water, explaining sharp velocity drops and near-constant attenuation observed at the LAB.
Researchers found that stable cratons have repeatedly deformed beneath their crust since formation, contradicting decades of plate tectonics theory. This deformation is caused by dense mantle keels peeling away from the lithosphere during supercontinent breakup.
A study from Smithsonian researchers deepens understanding of Earth's crust by testing and eliminating the garnet hypothesis about why continental crust is lower in iron and more oxidized. The findings suggest that intense heat and pressure cannot produce the necessary conditions for garnet formation, contradicting a popular explanation.
Researchers have discovered a new layer of partly molten rock under the Earth's crust that helps settle a long-standing debate about how tectonic plates move. The study reveals that the melt layer has no significant influence on plate tectonics, with convection of heat and rock being the prevailing force.
A global team led by researchers from Curtin University used a supercomputer-powered technology to explore the geology of Mars without leaving home. They found that the ancient Martian meteorite NWA 7034 was ejected 5-10 million years ago from the north-east of the Terra Cimmeria - Sirenum province, in the southern hemisphere of Mars.
Researchers propose new dynamic model suggesting thermal energy causes continental plates to drift, but the main driving force is supplied by a gravitational slip of the continental crust and hot mantle upwelling. This model explains why the opening of the Atlantic Ocean is wider in the south than in the middle.
Scientists found that a rift in the Earth's crust was caused by a super volcano splitting the Indian Plate from Africa. The process involved the rotation of the continental plates due to the subcontinent acting like an axis.
Researchers used ancient crystals to test the theory that portions of Earth's ancient crust acted as 'seeds' for later generations of crust. A three-billion-year-old magmatic event led to a global spike in crust production, matching regions worldwide and pointing to a significant widespread event.
Researchers report that niobium readily dissolves in iron under high temperatures and pressures consistent with the Earth's core formation. This finding supports core formation models suggesting that the core did not form under highly reducing or oxidizing conditions, but rather was constrained by the sequestration of niobium.
Researchers find that mountain height is determined by the balance of forces in the Earth's crust, rather than erosion. This new understanding opens up opportunities to study the long-term development and growth of mountains.
Researchers challenge long-held idea that magma chambers are composed mostly of crystals. A new study reveals large basaltic magma chambers may be entirely liquid-dominated.
Researchers have discovered that stable isotopes of zirconium can be fractionated by magnitudes much larger than previously thought. This finding changes the view on how this element behaves in the solid Earth, enabling a new tool to gain insights into magma chemistry as it crystallizes.
Research suggests that southern Arizona was a high-elevation plateau with elevations over 10,000 feet, similar to Tibet, due to its thick Earth's crust. The study provides insight into mountain formation and distribution of natural resources like copper.
Scientists have discovered gases released from deep beneath the Earth's crust in South Africa, which originate from a column of hot material called a hotspot. This hotspot pushes the crust upwards, generating the distinctive landscape consisting of tablelands over one kilometre above sea level.
Researchers from the University of Cambridge used 'crystal clocks' to estimate magma storage times near the Earth's crust-mantle boundary. They found that magma can be stored for over 1,000 years, helping improve models of volcanic eruptions and release of gases.
A study led by Drexel University's Amanda Lough has shown that East Antarctica is seismically active, contradicting the long-held assumption that its inactivity was caused by ice. The seismic array detected 27 earthquakes in 2009, tripling the total number of recorded events.
Recent studies suggest that the Hawaiian hotspot moved southward at a rate of several tens of kilometers per million years. This new evidence contradicts the long-held assumption that hotspots are stationary and supports a dynamic Earth model.
A comprehensive analysis of 101 major earthquakes found most aftershock activity occurred on the margins of the fault slip zone, supporting the idea that large-slip zones are unlikely to rupture again soon. Stress increases in surrounding areas.
Researchers have discovered a 'reverse energy cascade' that traps rising magma in the crust, forming massive granite bodies like Yosemite's El Capitan. This process helps build better understanding of volcanoes, their impacts on global climate, and where large volcanoes are likely to occur.
UMass Amherst researchers investigate strike-slip faults, revealing the 'Lazy Earth' hypothesis, where faults evolve to optimize energy transformation. The study identifies four stages in fault evolution: pre-faulting, localization, linkage, and slip, with irregularities persisting along mature faults.
Large reservoirs of magma stored deep in the Earth's crust trigger 'super-eruptions' by slowly feeding magma into smaller reservoirs. This process can take millions of years, making these events rare.
Researchers from AWI deploy ocean bottom seismometers to record earthquakes on Southwest Indian Ridge, revealing unique insights into ocean floor formation. Water circulation up to 15km deep leads to aseismic areas with soft soap-like rock that moves without jerking.
Research from University of Toronto and University of Aberdeen suggests ancient 'scars' in the Earth's crust may trigger earthquakes and mountain formation. The team proposes a new 'perennial plate tectonic map' to illustrate how past processes impact present-day geological activity.
Geophysicists use GOCE data to visualize the Earth's crust beneath, shedding new light on plate tectonics and geological characteristics. The technique, developed by TUM researchers, enables three-dimensional imaging of the Earth using two grids – similar to stereoscopic vision with two eyes.
Scientists at the National Oceanography Centre have discovered a new type of hydrothermal vent system, which could improve understanding of how the Earth's interior cools. The unique system, driven by hot rock and faults, was found to release significant amounts of heat and chemicals into the crust.
A team of geologists measured and simulated a complete seismic cycle at Isla Santa María, Chile, revealing a 10-20% permanent vertical uplift. The cycle was triggered by the 1835 earthquake, which caused an initial uplift of 2-3 meters.
A team of geophysicists discovered the twin scars of two massive asteroid impacts in Central Australia, hidden deep within the earth's crust. The impact zones are estimated to be over 400 kilometers wide and are believed to have occurred millions of years ago.
Scientists have made new discoveries about fault development, which could lead to more accurate predictions of earthquake hazards. By analyzing fault geometry, researchers found that the efficiency of faults increases as new ones grow and link, but never reaches the same level as straight faults.
A University of Arizona-led team reports that Iceland's glaciers are melting at an accelerated rate, causing the island's crust to rise rapidly. The study uses GPS measurements to track geological activity and finds a direct connection between glacier loss and uplift.
Researchers found a horizontally layered magma reservoir beneath the Toba caldera, composed of numerous intrusions with molten material. This discovery sheds light on the accumulation and eruption mechanisms of super-volcanoes, which occur every few hundred thousand years.
Researchers at ETH Zurich and ESRF have identified a trigger for supereruptions, finding that the overpressure generated by density differences in the magma chamber alone can trigger an eruption. The study suggests that supervolcanos are not triggered solely by overpressure due to magma recharge.
Recent model calculations suggest that Earth's primary crust formed during the Archean eon was so dense it subside into the mantle. This process, known as delamination, triggered a return flow of mantle material to form new crust.
A team of researchers discovered a bacterium that requires rare earths to grow and produce energy from methane. The rare earths are necessary for the enzyme methanol dehydrogenase, which processes the methanol produced in methane decomposition.
Researchers found chemical signatures similar to plume volcanoes in the Marie Byrd Seamounts, which do not fit typical models of fire mountain formation. They propose that mantle material was shifted under oceanic plates, leading to volcanic eruptions on the adjacent seamounts.
Scientists have found that molten magma reservoirs in the crust can persist for far longer than previously thought, with some chambers sitting for hundreds of thousands of years. This new understanding has significant implications for volcanic arcs and the detection of magma pools beneath them.
Geoscientist Michele Cooke's study explores fault evolution around bends using a mechanical efficiency approach, dubbed the "Lazy Earth" hypothesis. The findings suggest that the crust behaves in accord with work minimization principles, leading to increased efficiency and the formation of new faults.
Researchers at the University of Liverpool have discovered a connection between changes in heat flow from the Earth's core into the base of the overlying mantle and variations in the long-term reversal rate of the magnetic field. The study suggests that this process may lead to an increase in large igneous provinces, potentially affect...
Scientists have discovered that the Earth's crust beneath the Mississippi Delta sinks at a much slower rate than previously assumed. The researchers used sea-level reconstructions from different portions of coastal Louisiana to compare rates of subsidence over time.
A Purdue-led research team found a previously unmapped fault, the Léogène fault, was responsible for the devastating Haiti quake. The newly discovered fault runs parallel to the Enriquillo fault and remains ready to produce large earthquakes, threatening Haiti's stability.
Researchers have revised estimates of Greenland and West Antarctica ice cap melting rates using GRACE satellites, GPS measurements, and glacial isostatic adjustment data. The corrected estimate shows the ice caps are melting at approximately half the predicted speed, resulting in a lower average sea level rise.
A new theory developed at Purdue University suggests that stored stress built up in the Earth's crust long ago can trigger large earthquakes. Rapid erosion from the Mississippi River ended a period of forces keeping the New Madrid fault from slipping, triggering the massive earthquakes.
Researchers have made significant findings on the state of stress in central and eastern North American seismic zones, providing insights into earthquake-generating stresses. Additionally, studies have mapped the depth domains of the Eastern Ghats Belt in India, offering clues to understanding ancient collisions.
Oceanic core complexes are large elevated massifs formed along slow-spreading mid-ocean ridges. Research by Dr. Bram Murton and colleagues found that these complexes form during periods of reduced magma supply from volcanism, leading to suppressed or absent volcanism.
A team led by James E. Quick discovered a fossil supervolcano in the Sesia Valley, revealing unprecedented depth of magmatic plumbing. This find advances scientific understanding of active supervolcanoes like Yellowstone and may help predict future eruptions.
A team of Danish researchers has discovered the origin of the Baikal Rift Zone, a 2000km long crack in the Earth's crust that created the world's deepest lake. The study shows that the bottom of the crust is flat across Lake Baikal, contrary to previous models, and is instead thinning due to magma intrusion.
Geologists found that continents lose around 20% of their mass through chemical weathering involving the Earth's crust, water, and atmosphere. The lighter silicon-rich rock left behind is buoyed up by denser magnesium-rich rock beneath the Earth's crust.
Researchers used GPS to record precise movements of hundreds of points on the Asian continent over 10 years, finding that most of Asia behaves like a 'c ceramic plate' while some areas, such as Tibet, deform more like Play-Doh. The findings challenge long-standing theories and provide new insights into continental deformation.