Mantle Current Events

Mantle Current Events, Mantle News Articles.
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Heat transport property at the lowermost part of the Earth's mantle
Lattice thermal conductivities of MgSiO3 bridgmanite and postperovskite (PPv) phases under the Earth's deepest mantle conditions were determined by quantum mechanical computer simulations. We found a substantial increase in the conductivity associated with the phase change. This indicates that the PPv phase boundary is the boundary not only of the mineralogy but also the thermal conductivity. The effect of anisotropy on the conductivity of PPv in the heat transport properties at the lowermost mantle was also found to be minor. (2020-02-13)

Liverpool scientist discovers new layer of the Earth
A University of Liverpool scientist has discovered a new layer near the Earth's core, which will enable the internal temperature of the Earth's mantle to be measured at a much deeper level than previously possible. (2005-04-14)

Weird wave behavior near earth's core
Geologists have been intrigued by observations that some seismic waves travel faster than others in particular patches of the lowermost mantle, but they haven't known exactly why that happens. New work by researchers at the University of Michigan and Yale University, published in the March 21 issue of Nature, helps explain the phenomenon and offers new insights into Earth's inner workings. (2002-03-20)

Earth's dynamic interior
Seeking to better understand the composition of the lowermost part of Earth's mantle, a team of Arizona State University researchers has developed new simulations that depict the dynamics of deep Earth. (2014-03-30)

When continents formed
A new way to calculate the age of the Earth's crust has been developed by researchers from the University of Bristol and the University of St Andrews. (2011-01-13)

A new, clearer insight into Earth's hidden crystals
Geologists have developed a new theory about the state of Earth billions of years ago after examining the very old rocks formed in the Earth's mantle below the continents. (2021-02-17)

Heavy iron isotopes leaking from Earth's core
Earth's molten core may be leaking iron, according to researchers who analyzed how iron behaves inside our planet. (2020-04-13)

A speed gun for the Earth's insides
Researchers at the University of Bristol reveal today in the journal Nature that they have developed a seismological (2010-10-27)

Is this what killed the dinosaurs?
The extinction of the dinosaurs - thought to be caused by an asteroid impact some 65 million years ago - was more likely to have been caused by a 'mantle plume' - a huge volcanic eruption from deep within the earth's mantle, the region between the crust and the core of the earth. This theory, already supported by a significant body of geologists and palaeontologists, is strengthened by new evidence to be presented at an international conference at Cardiff University, UK. (2003-09-10)

Researchers help define Southern Ocean's geological features
The scientists present data from the region that show the Australian-Antarctic Ridge has isotopic compositions distinct from both the Pacific and Indian mantle domains. (2019-02-08)

What makes the Earth's surface move?
Do tectonic plates move because of motion in the Earth's mantle, or is the mantle driven by the plates' movement? Or could it be that this question is ill-posed? This is the point of view adopted by scientists at the ENS -- PSL, the CNRS and the University of Rome 3, who regard the solid Earth as a single system. According to their simulations, the surface mainly drives the mantle, although changes occur over time. (2019-10-30)

The Deccan Traps: Double, double magma trouble
A new study suggests that roughly 65 million years ago, not just one plume of magma, but two, fueled the mass eruption along the Deccan Traps, an event that contributed to one of the greatest extinction events on Earth. (2017-02-09)

FSU scientist finds evidence of high iron content beneath Hawaii
A new set of measurements has allowed a Florida State University geochemist to confirm what other scientists have only suspected about what lies deep below the Earth's surface. (2004-09-30)

The patchy weather in the center of the Earth
The temperature 3,000 kilometers below the surface of the Earth is much more varied than previously thought, scientists have found. The discovery of the regional variations in the lower mantle where it meets the core, which are up to three times greater than expected, will help scientists explain the structure of the Earth and how it formed. (2015-12-17)

Scientists find oxidized iron deep within the Earth's interior
Scientists digging deep into the Earth's mantle recently made an unexpected discovery. Five hundred and fifty kilometres below the Earth's surface, they found highly oxidized iron, similar to the rust we see on our planet's surface, within garnets found within diamonds. The result surprised geoscientists around the globe because there is little opportunity for iron to become so highly oxidized deep below the Earth's surface. (2018-01-23)

Oldest Earth mantle reservoir discovered
Researchers have found a primitive Earth mantle reservoir on Baffin Island in the Canadian Arctic. Geologist Matthew Jackson and his colleagues from a multi-institution collaboration report the finding -- the first discovery of what may be a primitive Earth mantle -- this week in the journal Nature. (2010-08-11)

Research reveals the scale at which Earth's mantle composition varies
A new study by geochemists from Brown University suggests that Earth's upper mantle varies in composition over kilometer-sized pockets. (2017-11-27)

Diffusive infiltration may explain strange behavior in magma
Recent experiments by a University of Illinois researcher have shed light on how glassy materials -- melts that have been quickly frozen -- are formed in exotic chunks of mantle called xenoliths, and how ascending magmas in the mantle can affect the lava output at Earth's surface through chemical, rather than thermal, reactions. (2000-03-02)

UTA study sheds new light on evolution
Research from the University of Texas at Arlington and the Wadia Institute of Himalayan Geology suggests that hydrogen, oxygen, water and carbon dioxide are being generated in the earth's mantle hundreds of kilometers below the earth's surface. (2017-10-03)

Geologist's discoveries resolve debate about oxygen in Earth's mantle
While there continues to be considerable debate among geologists about the availability of oxygen in the Earth's mantle, recent discoveries by a University of Rhode Island scientist are bringing resolution to the question. (2010-12-14)

Scientists discover possible mantle mineral
Whhat mineral hosts Fe3+ had remained a secret. Now scientists have a possible answer: Maohokite, a newly discovered high-pressure mineral. It may be what composes the Earth's lower mantle along with Bridgmanite MgSiO3 and magnesiow├╝stite MgO. (2018-12-06)

Geophysicists Propose A New Model Of Earth's Mantle
Earth's mantle, a region as scientifically remote as outer space and the object of the most heated debate in geophysics, gets a remodeling this Friday by researchers at the University of California, Davis, and MIT. (1999-03-19)

Scientists reveal the links between deep carbon cycle and geodynamics of big mantle wedge
The formation age of the big mantle wedge beneath eastern Asia and the lithospheric thinning mechanism of the North China craton are two key scientific issues. Based on new findings of deep carbon cycle, a recent study suggests that the big mantle wedge beneath eastern Asia was formed 125 Ma, and interaction between the CO2-rich silicate melt produced in the big mantle wedge and lithospheric mantle results in lithospheric thinning of the North China craton. (2018-07-19)

Thicker mantle may explain some of Earth's inner processes
A new study finds that the viscosity of the Earth's mantle abruptly increases 1,000 kilometers (621 miles) below the surface, differing significantly from previous estimates, which suggest this phenomenon occurs at depths of roughly 670 km (416 miles). (2015-12-10)

Why is the Earth's F/Cl ratio not chondritic?
It is generally believed that terrestrial planets were made from chondrites. However, geochemical observations have shown that the abundance pattern of volatile elements, such as fluorine and chorine in the Earth is inconsistent with chondrites. New high-pressure experiments on the silicate mineral-melt partitioning of F and Cl suggest that F and Cl fractionation during magma ocean crystallization could explain the non-chondritic Earth's F/Cl ratio. (2019-06-30)

Geologists find key indicator of carbon sources in Earth's mantle
Researchers at the University of Notre Dame found evidence of varying ratios of boron isotopes in igneous rocks, known as carbonatites, of different ages. (2016-11-09)

Lava fingerprinting reveals differences between Hawaii's twin volcanoes
Hawaii's main volcano chains -- the Loa and Kea trends -- have distinct sources of magma and unique plumbing systems connecting them to the Earth's deep mantle, according to UBC research published this week in Nature Geoscience, in conjunction with researchers at the universities of Hawaii and Massachusetts. (2011-11-29)

The lower mantle can be oxidized in the presence of water
In regions at depths greater than 1900 kilometers, scientists found active interactions between water and mantle rocks, which are oxidizing Earth's mantle. Water may have reached and dwelled at the lowermost part of the mantle over geologic time. (2020-05-22)

What goes down, must come up: Earth's leaky mantle
Research in this week's Nature takes aim at a conundrum that's long vexed geoscientists: How to reconcile convection of the Earth's mantle with observations of ancient noble gases in volcanic rocks. Solving the problem requires that the recycling of tectonic plates into the Earth's lower mantle is balanced by hot, buoyant mantle plumes that rise with little mixing to the Earth's surface, producing volcanic island chains like Hawaii. (2009-05-27)

Newly discovered Greenland plume drives thermal activities in the Arctic
A team of researchers understands more about the melting of the Greenland ice sheet. They discovered a flow of hot rocks, known as a mantle plume, rising from the core-mantle boundary beneath central Greenland that melts the ice from below. (2020-12-07)

Scientists make new estimates of the deep carbon cycle
Over billions of years, the total carbon content of the outer part of the Earth -- in its mantle lithosphere, crust, oceans, and atmospheres -- has gradually increased, scientists reported this month in the journal Proceedings of the National Academy of Sciences. Scientists Craig Manning of UCLA and Peter Kelemen of Columbia University present new analyses that represent an important advance in refining our understanding of Earth's deep carbon cycle. (2015-06-18)

Flow in Earth's mantle moves mountains
Study in Nature suggests that some mountains in (2010-06-02)

Icelandic volcano sits on massive magma hot spot
New research from University of California Davis and Aarhus University in Denmark shows that high mantle temperatures miles beneath the Earth's surface are essential for generating large amounts of magma. In fact, the scientists found that Iceland's Bardarbunga volcano lies directly above the hottest portion of the North Atlantic mantle plume. (2014-10-24)

Melting temperature of Earth's mantle depends on water
A joint study between Carnegie and the Woods Hole Oceanographic Institution has determined that the average temperature of Earth's mantle beneath ocean basins is about 110 degrees Fahrenheit (60 Celsius) higher than previously thought, due to water present in deep minerals. (2017-03-02)

Deep-earth diamonds reveal primordial rock source in Earth's mantle
An analysis of helium isotopes locked inside 'super-deep' diamonds hundreds of kilometers below Earth's surface suggests that vast reservoirs of molten primordial source rock, perhaps nearly as old as the Earth, are present. (2019-08-15)

What happens under the Yellowstone Volcano
A recent study by Bernhard Steinberger of the German GeoForschungsZentrum and colleagues in the USA helps to better understand the processes in the Earth's interior beneath the Yellowstone supervolcano. The paper will soon appear in the journal 'Geochemistry, Geophysics, Geosystems' published by the American Geophysical Union. It is based on modelling the Earth's mantle. (2019-10-17)

MIT Researchers Propose New Model For Convective Circulation Within Earth's Mantle
Almost two years after convincing the scientific community that most of the Earth's mantle is uniform in composition, National Science Foundation (NSF)-funded researchers at the Massachusetts Institute of Technology propose a model that may explain why the mantle seems to comprise two dissimilar and separate sections. (1999-03-19)

Is there an ocean beneath our feet?
Scientists at the University of Liverpool have shown that deep sea fault zones could transport much larger amounts of water from the Earth's oceans to the upper mantle than previously thought. Seismologists at Liverpool have estimated that over the age of the Earth, the Japan subduction zone alone could transport the equivalent of up to three and a half times the water of all the Earth's oceans to its mantle. (2014-01-27)

The continents as a heat blanket
Drifting of the large tectonic plates and the superimposed continents is not only powered by the heat-driven convection processes in the Earth's mantle, but rather retroacts on this internal driving processes. In doing so, the continents function as a thermal blanket, which leads to an accumulation of heat underneath, and which in turn can cause the break-up of the super-continents. (2009-01-22)

Oozing magma of ocean floor tells about mantle below
An article in Nature this week reports new information about the movement of the upper mantle immediately underneath the Earth's crust. Plate tectonics is the surface manifestation of this movement. The plate including India is crashing into Asia, pushing up toward the Himalayan Mountains. The recent large earthquake in India is part of this movement. (2001-02-07)

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