Lower Mantle Current Events | Lower Mantle News
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What goes down, must come up: Earth's leaky mantle
A new analysis of the processes that constantly stir the Earth's deep mantle is helping to explain how the mantle holds onto a portion of ancient noble gases that were trapped during the Earth's formation. view more (2009-05-28)
Journey to the center of the Earth -- Imperial scientists explain tectonic plate motions
The first direct evidence of how and when tectonic plates move into the deepest reaches of the Earth is published in Nature today. 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. view more (2008-02-22)
How do they spread?
Propagation of earthquake waves within the Earth is not uniform. Experiments indicate that the velocity of shear waves (s-waves) in Earth's lower mantle between 660 and 2900 km depth is strongly dependent on the orientation of ferropericlase. view more (2009-04-13)
What Goes On Underneath Your Feet?
It is generally assumed that heat from Earth's core and mantle, due to the low thermal conductivity of the latter, is transferred to the outer part mainly by convection. This implies swirling movement of an immense amount of hot material, which is behind the dynamics of Earth's interior. Understanding the details of this is of great interest since... view more... (2004-07-16)
Researchers locate mantle's spin transition zone, leading to clues about Earth's structure
Researchers have located the spin transition zone of iron in Earth's lower mantle, a discovery which has profound geophysical implications. view more (2007-09-24)
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. view more (2009-01-23)
News from Cancer: Risk factors for deadly form of lymphoma
A new study indicates that the incidence of mantle cell lymphoma, an aggressive type of non-Hodgkin's lymphoma, is on the rise, most frequently striking men, Caucasians and older individuals. view more (2008-07-07)
New clues about the Earth's movements
Synchrotron light has just revealed new clues about how the Earth moves. A team of scientists (Dubrovinsky et al) from four different countries and different fields of expertise have come to the ESRF to study materials submitted to extreme conditions of pressure and temperature, similar to those found at the boundary between the core and the... view more... (2003-03-07)
Intense chemotherapy wards off recurrence in half of mantle cell lymphoma patients after seven years
More than half of younger mantle cell lymphoma patients who received an intensive regimen of chemotherapy as frontline treatment remain in remission seven years later, researchers at The University of Texas M. D. Anderson Cancer Center report today at the 50th annual meeting of the American Society of Hematology. view more (2008-12-10)
Super deep rock formation and upper mantle move in concert
European Highlight from Geophysical Research Letters (GRL) In a finding that contradicts conventional wisdom, results from a new technique to survey the super-deep upper mantle of southern Africa show that underground volcanic rock shifted with the lithospheric plates in the area. Previously, researchers thought that the motion of the two objects... view more... (2002-03-06)
Patterns on tropical marine mollusk shell mirror gene expression patterns
Scientists have identified a group of genes that control the formation of shapes and colour patterns on the shell of the tropical marine mollusc referred to as 'abalone'. view more (2006-11-22)
Friction Inside The Earth Is A Source Of Heat
There is high temperature inside our planet and the reason is not known yet. A common belief that the Earth`s interior is heated by radioactive elements is now doubted of. Professor Felix Letnikov from Irkutsk Institute of the Earth`s Crust have proposed an idea that the heat is formed in the outer core because of friction between its layers.... view more... (2002-06-28)
Mercury's shifting, rolling past
Patterns of scalloped-edged cliffs or lobate scarps on Mercury's surface are thrust faults that are consistent with the planet shrinking and cooling with time. However, compression occurred in the planet's early history and Mariner 10 images revealed decades ago that lobate scarps are among the youngest' features on Mercury. Why don't we find more... view more... (2008-03-18)
Seismologists detect a sunken slab of ocean floor deep in the Earth
Halfway to the center of the Earth, at the boundary between the core and the mantle, lies a massive folded slab of rock that once formed the ocean floor and sank beneath North America some 50 million years ago. view more (2006-05-18)
UBC study may solve age-old mystery of missing chemicals from Earth's mantle
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. view more (2007-12-06)
Complex structure observed in Tonga mantle wedge has implications for the evolution of volcanic arcs
The subduction zones where oceanic plates sink beneath the continents produce volcanic arcs such as those that make up the "rim of fire" around the Pacific Ocean. view more (2007-04-13)
The first new mineral with post-spinel structure is approved by CNMNC of IMA
Xiete is the first new mineral with post-spinel structure found by a Chinese-American team from the Guangzhou Institute of Geochemistry, Chinese Academy of Sciences and the Geophysical Laboratory, Carnegie Institution of Washington, which has recently been approved by the Commission on New Minerals, Nomenclature and Classification of the... view more... (2008-09-12)
Hotspots or Not? Isotopes Score One for Traditional Theory
One great beauty of plate tectonics theory is that it explains so many geological phenomena at one time. But plate tectonics could not explain the location of many volcanic islands - Hawaii, the Azores or the Galapagos Islands, often called "hotspots" - far from the edge of tectonic plates. view more (2006-12-07)
How rusty is the Earth?
An iron object lying around outside quickly turns rusty. Iron metal always has to be combined with some other elements or coated with paint to stop it corroding. The reason for this is that iron metal is unstable in the presence of the oxygen in the Earth's atmosphere. It reacts with the iron to produce ferric iron, a form of iron that exists in... view more... (2004-06-10)
Journey to the center of the earth: Discovery sheds light on mantle formation
Uncovering a rare, two-billion-year-old window into the Earth's mantle, a University of Houston professor and his team have found our planet's geological history is more complex than previously thought. view more (2008-04-11)
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