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All Articles Tagged As: mantle
 | When Earth was young, it exhaled the atmosphere. During a period of intense volcanic activity, lava carried light elements from the planet's molten interior and released them into the sky. However, some light elements got trapped inside the planet. In this week's issue of Nature, a Rice University-based team of scientists is offering a new answer to a longstanding mystery: what caused Earth to hold its last breath? ...> Full Article |
 | Heat transport in the Earth's mantle and in the atmosphere is probably not as effective as previously thought. ...> Full Article |
A team of scientists from Oregon State University has created the first global 3-D map of electrical conductivity in the Earth's mantle and their model suggests that that enhanced conductivity in certain areas of the mantle may signal the presence of water.
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 | A research program aimed at using platinum as an exploration guide for nickel has for the first time been able to put a time scale on the planet's large-scale convection processes. ...> Full Article |
 | For the first time scientists have discovered the presence of a natural deep earth pump that is a crucial element in the formation of ore deposits and earthquakes. ...> Full Article |
 | UC Davis team calculates distribution of iron isotopes in Earth's mantle 4.5 billion years ago, opening door to new studies of planet's geologic history ...> Full Article |
Geologists find 'blob' of material beneath the US West Great Basin
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Computer simulations, paleomagnetism and plate motion histories described in today's issue of Science reveal how hotspots, centers of erupting magma that sit atop columns of hot mantle that were once thought to remain firmly fixed in place, in fact move beneath Earth's crust.
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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.
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 | The key to understanding Earth's evolution, including our atmosphere and how volcanoes and earthquakes form, is to look into the lower mantle, a region some 400 to 1,800 miles below the surface. Researchers at the Carnegie Institution's Geophysical Laboratory simulated conditions at these depths and discovered that the concentration of highly oxidized iron in the two major mantle minerals is key to moving heat in that region and affects material movement throughout the planet. ...> Full Article |
 | Materials deep inside Earth have unexpected atomic properties that might force earth scientists to revise their models of Earth's internal processes, a team of researchers has discovered. ...> Full Article |
 | Tiny minerals found inside diamonds have provided us with a rare glimpse of the Earth’s deepest secrets. ...> Full Article |
With locked crust, Earth could become another Venus
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 | A new model of inner Earth constructed by Arizona State University researchers pulls past information and hypotheses into a coherent story to clarify mantle motion. ...> Full Article |
Researcher calls into question three decades of conventional wisdom regarding some of the physical processes that helped shape the Earth as we know it today.
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Geologist unearths ancient rocks from ocean floor dating back two billion years
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 | The first direct evidence of how and when tectonic plates move into the deepest reaches of the Earth has been detailed in Nature. Scientists hope their description of how plates collide with one sliding below the other into the rocky mantle could potentially improve their ability to assess earthquake risks. ...> Full Article |
 | Theoretical physicists at the University of Chicago are suggesting how thin spouts of magma in the Earth's mantle can persist long enough to form hotspot volcanism of the type that might have created the Hawaiian Islands. ...> Full Article |
 | Princeton Earth scientist Frederik Simons believes the answers to questions about such unpredictable and destructive acts of nature as earthquakes and volcanoes might best be found floating in the ocean. ...> Full Article |
 | Since we can't sample the deepest regions of the Earth, scientists watch the velocity of seismic waves as they travel through the planet to determine the composition and density of that material. Now a new study suggests that material in part of the lower mantle has unusual electronic characteristics that make sound propagate more slowly, suggesting that the material there is softer than previously thought. The results call into question the traditional techniques for understanding this region of the planet. The authors, including Alexander Goncharov from the Carnegie Institution's Geophysical Laboratory, present their results in the January 25, 2008, issue of Science. ...> Full Article |
 | Geologists Say 'Wall of Africa' Allowed Humanity to Emerge ...> Full Article |
Observations about the early formation of Earth may answer an age-old question about why the planet's mantle is missing some of the matter that should be present, according to UBC geophysicist John Hernlund.
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 | Research into deep Earth interactions has led to some important findings, particularly for someone so new to the field, and the scientific world is paying attention. ...> Full Article |
 | Seismologists have recast their understanding of the inner workings of Earth from a relatively homogeneous environment to one that is highly dynamic and chemically diverse. ...> Full Article |
If our planet did not have the ability to store oxygen in the deep reaches of its mantle there would probably be no life on its surface. This is the conclusion reached by scientists at the University of Bonn who have subjected the mineral majorite to close laboratory examination. Majorite normally occurs only at a depth of several hundred kilometres under very high pressures and temperatures.
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 | Geochemists at are challenging commonly held ideas about how gases are expelled from the Earth. Their theory could change the way scientists view the formation of Earth's atmosphere and those of our distant neighbors, Mars and Venus. Their data throw into doubt the timing and mechanism of atmospheric formation on terrestrial plants. ...> Full Article |
 | Geologists learn by looking at rocks. Of course, it's not that simple. Here in Minnesota, the tapestry of mineral-laden geology lies buried under forests, soils and parking lots. ...> Full Article |
Laboratory measurements of a high-pressure mineral believed to exist deep within the Earth show that the mineral may not, as geophysicists hoped, have the right properties to explain a mysterious layer lying just above the planet's core.
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A sheet of molten rock roughly 10 miles thick spreads underneath much of the American Southwest, some 250 miles below Tucson. From the surface, you can't see it, smell it or feel it.
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