Articles tagged with Mantle Slabs
A study by Okayama University reveals that garnet governs the formation of Earth's 660-km seismic boundary, shaping the mineral transitions that control heat and material circulation. This finding provides a unified explanation for complex seismic observations and supports a homogeneous, pyrolite-like mantle composition.
A new study has confirmed that much of the deep mantle deformation occurs where researchers suspect there may be deeply subducted tectonic slabs. The research used an unprecedented database of over 16 million seismograms to analyze seismic anisotropy and provide a global map of the phenomenon.
Deformation mechanisms of serpentinite, a key research target for understanding plate boundaries, have been investigated. Grain boundary sliding dominates deformation, producing 'B-type' CPO patterns, which contribute to seismic activity and earthquakes.
Research finds that pyrope garnet can retain up to 0.2 wt.% water, potentially dominating water transport via basaltic slabs into the lower mantle. The study also reveals strong pressure-temperature dependence of water solubility in pyrope garnet.
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.
Compositional rock anomalies within oceanic plates caused by ancient tectonics influence the trajectory and speed of subducting plates. The findings provide a greater understanding of plate subduction, recycling surface materials deep into the Earth's interior.
Researchers modelled mantle convection to show African LLVP has older, better mixed material than Pacific LLVP, which is enriched in subducted oceanic crust. This difference affects heat extraction from Earth's core, posing a challenge for observations and models.
A research team from the University of Göttingen investigated the influence of the Zagros Mountains on Earth's surface bending. They found that the Neotethys oceanic plate is breaking off horizontally, creating a depression in the region.
Researchers discovered a mysterious subduction zone deep beneath the Pacific Ocean, reshaping our understanding of Earth's interior structure. The team found an unusually thick area in the mantle transition zone, suggesting the presence of colder material that slows down oceanic slabs as they sink through the mantle.
Researchers investigate the effect of oxygen content on mantle rock melting and early Earth magma ocean formation. The study reveals that oxygen fugacity significantly influences melting temperatures, suggesting current models need revision.
Researchers at the University of Arizona used computer simulations and spacecraft data to study the moon's geology, finding that a dense layer of titanium-rich material sank into the interior and rose on the near side. The findings suggest that the moon 'turned itself inside out' during its formation.
Researchers used computer simulations to demonstrate that a subduction zone originating in the Western Mediterranean will propagate into the Atlantic under the Strait of Gibraltar. This will create a new Atlantic subduction zone, which will then move down into the Earth's mantle.
Researchers have discovered distinct characteristics of the lower mantle flow field beneath the Philippine Sea Plate. They found that ancient N-S fast velocity directions exist at depths of 700-900 km and are not related to slab subduction or a mantle plume.
Researchers at Colorado State University have made a groundbreaking discovery in understanding how mountains form, revealing that deep Earth processes are the primary drivers of mountain building in subduction zones. By combining novel data sets and techniques with traditional geomorphology measurements, the team generated a long-term ...
Researchers observed two distinct seismic discontinuities in the mantle transition zone, representing the upper and lower boundaries of a subducted Pacific high-velocity slab. The study suggests a compositionally layered slab with high-water contents beneath the slab, challenging existing knowledge on slab interfaces.
Geologists at MIT found that ancient Earth's mantle was up to 200 degrees Celsius hotter, causing subducting plates to sink all the way to the bottom of the mantle. This led to a 'graveyard' of slabs atop the Earth's core, suggesting a significant change in how mantle convection and plate tectonic processes occurred.
Researchers at Tohoku University used seismic tomography to image the three-dimensional structure of the Earth's interior, shedding new light on the deep Bonin deep earthquake. The study found that the Pacific slab is split and penetrated the lower mantle, with multiple factors contributing to its occurrence.
Scientists have discovered a subducted slab of oceanic lithosphere at the base of the Earth's mantle, providing direct evidence for its presence. The finding reveals new insights into the processes driving tectonic plate movement, suggesting that ancient seafloor can sink to the bottom of the mantle.
A team of seismologists detected a slab of sunken ocean floor at the Earth's core-mantle boundary, shedding light on mechanisms that give rise to volcanoes and earthquakes. The discovery suggests whole mantle circulation and provides new insights into the movement of tectonic plates.
Researchers at UC Davis and MIT propose a new model of Earth's mantle as two layers, reconciling conflicting evidence from seismologists and geochemists. The new model suggests that tectonic plates encounter a geological barrier in the lower mantle, preventing them from mixing with deep-mantle material.
Researchers have identified a 150-million-year-old piece of Earth's crust submerged in the mantle beneath Siberia's Lake Baikal. The study provides evidence that subducted slabs eventually sink to the Earth's core, shedding light on the planet's internal dynamics.