Articles tagged with Oceanic Plates
Research suggests that hydrous and repeated mantle melting is key driver of gold enrichment in island arc magmas. The study found that high-degree melting leads to significant concentrations of gold, often several times higher than those found in mid-ocean ridge basalts.
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.
A new seafloor study revealed that a thin, clay-rich layer hidden beneath the seafloor enabled the 2011 Japan earthquake to rupture all the way to the trench, producing massive displacement. This finding could help scientists better understand and respond to other intense earthquakes and tsunamis.
Researchers found evidence of spatial scale of 'chemical patchiness' in the upper mantle, caused by mantle plumes, to be less than 10 kilometers. This discovery indicates that the upper mantle is more capable of mixing and homogenizing material than previously thought.
Geologists have connected a 120-million-year-old 'super-eruption' to its source, revealing insights into Earth's complex geological history. The discovery provides a more complete history of the Pacific Ocean basin and sheds light on volcanic activity in the region.
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 have discovered large undersea faults on the Pacific Ocean floor that are pulling the Pacific Plate apart. The newly found faults, some thousands of meters deep and hundreds of kilometers long, are weakening the plate due to immense forces within it.
Scientists have discovered that superdeep diamonds can provide a window into the growth and formation process of ancient supercontinents like Gondwana. By analyzing tiny inclusions within these diamonds, researchers were able to determine the age of the mantle rocks that helped buoy and grow the supercontinent from below.
Researchers reconstructed a massive tectonic plate from fragments found in mountain belts around the world. They discovered that the plate, named Pontus, existed for at least 150 million years and had a significant impact on Earth's geological history.
Researchers have found a large water reservoir beneath the ocean floor off New Zealand's North Island, which may be linked to the country's mysterious slow earthquakes. The discovery provides new insights into the correlation between fluids and tectonic fault movement, shedding light on the phenomenon of slow slip events.
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 have found large amounts of labile dissolved carbon stored in sediment interstitial water, indicating active organic carbon remineralization. The discovery suggests that earthquakes play a key role in the trench's carbon cycle and deep biosphere metabolisms.
Researchers from Macquarie University have found that the Earth's gradual cooling led to a flip in the deep cycling of carbon and chlorine between the surface and interior. Most carbon accumulates into solid carbonate sediments, while chlorine typically returns to the surface as volcanic gases.
A groundbreaking study finds that microbial life can exist without plate tectonics, challenging a fundamental theory of geology. Zircon crystals from the Barberton Greenstone Belt reveal a stagnant lid regime on ancient Earth, leading to continent formation and potentially habitable conditions.
Researchers have found evidence of 20 million years of 'hot spot' magmatism under the Cocos plate, with a long-lived melt channel that originated from a mantle plume. The study suggests that this channel is regionally extensive and may be a widespread source for intraplate magmatism.
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 investigated the relationship between slow slip events and tectonic strain in Japan's Bungo Channel, Tokai, and Boso-Oki regions. They found that not all accumulated strain is released during SSEs, but rather builds up in shallower areas before a megathrust earthquake can occur.
A new study analyzes volcanic rock samples collected in the 1980s to explain the geologic histories of Fiji and Vanuatu. The research attributes their current locations to subduction of the Samoan Seamount Chain, which caused a double-saloon door tectonic event leading to their separation.
Scientists have found that the tectonic stress in Japan's Nankai subduction zone is less than expected, contradicting predictions of a major buildup of pent-up energy. The research suggests that the fault may not be as unstable as thought, but still requires further investigation and long-term monitoring.
A team led by Northern Arizona University will investigate the tectonic and geodynamic processes controlling faulting, magmatism, and surface deformation in the Pacific Ocean. The research aims to better understand the asthenosphere's role in seismic and volcanic events.
Low-frequency tectonic tremors in Alaska are linked to high levels of dehydration in the Yakutat terrane, a subducting oceanic plateau. The study suggests that this dehydration reaction is caused by temperature and pressure conditions during plate subduction.
Researchers analyzed the 2018-2019 Bungo Channel slow slip event to gain insight into megathrust earthquake behavior. Despite its short duration, this event was larger in terms of slippage amount and slip velocity compared to past events, providing valuable information for predicting future earthquakes.
A team of researchers used advanced dating techniques to determine that the subduction of continental material occurred after the obduction of the Samail Ophiolite, contradicting previous estimates. The study provides new insights into subduction zones and their formation.
Scientists have found microdiamonds in a Cretaceous metamorphic rock formation in Nagasaki Prefecture, Japan, revealing that the crust has penetrated deeper than 120 km. This discovery challenges previous assumptions about Japan's geology and suggests that the country was once involved in continental collision zones.
A new study by a Virginia Tech geoscientist reveals that the Yellowstone super-volcano was powered by a gigantic ancient oceanic plate, not heat from the Earth's core. This ancient plate broke into pieces, resulting in explosive volcanic eruptions over the past 16 million years.
High-pressure X-ray measurements reveal the formation of a new phase of kaolinite, a clay mineral containing aluminium, under conditions similar to those in subduction zones. The super-hydrated phase contains more water than any other known aluminosilicate mineral in the mantle.
Researchers at CU-Boulder propose that water trapped deep below Earth's crust may have flooded the lower crust, creating buoyancy and lift, which could explain the region's high elevation. This mechanism is supported by past seismic studies showing a correlation between crustal thickness/density and elevation.
The North American Cordillera is composed of dozens of crustal blocks that were welded onto the continent over 200 million years. A new study clarifies their mode of origin, identifying a previously unknown oceanic plate that contributed to their assembly.
The study analyzes the Taiwan mountain belt to understand the initial formation of topographic curvature in a geologically young region. It also presents new U-Pb zircon ages for rocks in the Jurassic Bonanza arc, Vancouver Island, Canada, shedding light on the timing and character of ancient volcanic and plutonic activity.