Menu
Space exploration
Astronomers Discover Houdini-Like Vanishing Act in Space

Most Accurate Robotic Legs Mimic Human Walking Gait

Spaceflight May Extend the Lifespan of Microscopic Worm

Arctic Warming Linked to Combination of Reduced Sea Ice and Global Atmospheric Warming

World's Fastest Camera Used to Detect Rogue Cancer Cells

Keeping the Flu Away: Synthetic Protein Activates Immune System Within Two Hours

'MRI' of the Sun's Interior Motions Challenges Existing Explanations for Sunspots

Sounds of Northern Lights Are Born Close to Ground

Belching Black Hole Proves a Biggie: First Known 'Middleweight' Black Hole

Technique Spots Disease Using Immune Cell DNA

Pompeii-Style Volcanic Ash Fall Preserved 'Nursery' of Earliest Animals

Cutting Daily Sitting Time to Under Three Hours Might Extend Life by Two Years

Greater Diet-Induced Obesity in Rats Consuming Sugar Solution During the Inactive Period

Rising Carbon Dioxide in Atmosphere Also Speeds Carbon Loss from Forest Soils

Climate Change May Lead to Fewer but More Violent Thunderstorms

New Biofuel Process Dramatically Improves Energy Recovery, and Uses Agricultural Waste

Toward Achieving One Million Times Increase in Computing Efficiency

Hubble Unmasks Ghost Galaxies

New Parasitic Coral Reef Crustacean Named After Late Reggae Performer Bob Marley

The Old Primates' Club: Even Male Monkeys Ride Their Fathers' Coattails to Success

Data Storage of Tomorrow: Ferroelectricity On the Nanoscale

One Smart Egg: Birds Sense Day Length and Change Development

Dark Galaxies of the Early Universe Spotted for the First Time

Not So Happy: King Penguins Stressed by Human Presence

Nanodevice Builds Electricity from Tiny Pieces

X-Rays Illuminate the Origin of Volcanic Hotspots
Scientists have recreated the extreme conditions at the boundary between Earth's core and its mantle, 2,900 km beneath the surface. Using the world's most brilliant beam of X-rays, they probed speck-sized samples of rock at very high temperature and pressure to show for the first time that partially molten rock under these conditions is buoyant and should segregate towards Earth's surface. This observation is a strong evidence for the theory that volcanic hotspots like the Hawaiian Islands originate from mantle plumes generated at Earth's core-mantle boundary.

The results are published in Nature (July 19, 2012).

The group of scientists was led by Denis Andrault from the Laboratoire Magmas et Volcans of University Blaise Pascal in Clermont, and included scientists from the CNRS in Clermont and the European Synchrotron Radiation Facility (ESRF) in Grenoble, France.

Most volcanoes are situated where continental plates are pushed or pulled against each other. Here, the continental crust is weakened, and the magma can break through to the surface. The Pacific "Ring of Fire," for example, exhibits such plate movements, resulting in powerful Earthquakes and numerous active volcanoes.

Volcanic hotspots are of a completely different nature because most of them are far away from plate boundaries. The Hawaiian Islands, for example, are a chain of volcanoes thought to have their origin in a mysterious hot spot beneath the Pacific ocean floor. Every island in the chain starts as an active volcano fed by the hot spot that eventually rises above the ocean surface. As plate tectonics move the volcano away from the hotspot, it becomes extinct. The hot spot will in the meantime create another volcano: the next island in the chain. The Hawaiian Islands are one of many examples of this process, like the Canary Islands, La Réunion or the Azores.

The nature of the hot-spot source and its location in the mantle have remained elusive to the present day. One explanation is narrow streams of magma conveyed to Earth's surface from the boundary between Earth's core of liquid iron and the solid mantle of silicate rock. Whether the lowermost mantle expels such streams of magma called mantle plumes is one of today's major controversies among geologists.

What material can be stored at the core-mantle boundary and become sufficiently light to rise through 2900 km of thick solid mantle? This was the question Denis Andrault and his colleagues addressed when they set out to recreate in a laboratory the conditions found at the core-mantle boundary. They compressed tiny pieces of rock, the size of a speck of dust and ten times thinner than a human hair, between the tips of two conical diamonds to a pressure of more than one million bar. A laser beam then heated these samples to temperatures between 3000 and 4000 degrees Celsius, which scientists believe is representative of the 200km-thick core-mantle boundary. The samples are extremely small compared to the natural processes occurring in Earth. However, the melting processes are very well reproduced experimentally. Therefore, the observations can be confidently transferred from micron scale in the experiments to kilometre scale in the deep mantle.

Beams of X-rays at the ESRF, focused to a diameter of one 1000th of a millimetre, were used to map these samples and identify where the solid rock had melted. "Obviously, these tiny samples produce weak interaction signals, and this is why it is important to have the most brilliant X-ray beams for this type of experiments, says Mohammed Mezouar, the scientist responsible for the high-pressure beamline ID27 at the ESRF.

Once regions with molten rock had been identified, another X-ray technique was used at the ESRF to compare the chemical compositions of previously molten and solid parts. "It is the iron content which is decisive for the density of molten rock at the core-mantle boundary. Its accurate knowledge allowed us to determine that molten rock under these conditions is actually lighter than solid," says Denis Andrault.

Gravity makes the light liquid rock from a hotspot move slowly upwards like a bubble in water until it reaches the surface where the magma plume will form a volcano. The hotspots of liquid occur in the relatively thin boundary region between the solid lower mantle and the liquid outer core of Earth where the temperature rises over a distance of just 200 kilometres from 3000 to 4000 degrees. This steep rise is caused by the vicinity of the much hotter core and induces a partial melting of the rocks.

The results of the experiment are also of great significance for the understanding of the early history of Earth, as they provide an explanation why many chemical elements playing a key role in our daily life gradually accumulated from Earth's inside to its thin crust, close to the surface.

"We know less about the Earth's mantle than about the surface of Mars. It is impossible to drill a hole of even 100 kilometres into the Earth, so we have to recreate it in the laboratory. This is important knowledge, because active hot spot volcanoes like those in Iceland can be dangerous and disruptive for the daily lives of people far away," concludes Denis Andrault.

Для печати
Mechanical Engineers Develop an 'Intelligent Co-Pilot' for Cars

Lab-Engineered Muscle Implants Restore Function in Animals

Engineering Technology Reveals Eating Habits of Giant Dinosaurs

Protein Found in Spider Venom Could Treat Muscular Dystrophy

Force of Nature: Defining the Mechanical Mechanisms in Living Cells

Neurons Derived from Cord Blood Cells May Represent New Therapeutic Option

Coastal Populations Are Healthier Than Those Inland, UK Study Finds

Largest Ancient Dam Built by Maya in Central America

World Record: Lightest Material in the World Produced

Infants' Recognition of Speech More Sophisticated Than Previously Known

In Visual Searches, Computer Is No Match for the Human Brain

Musical Glove Improves Sensation, Mobility for People With Spinal Cord Injury

New Evidence Links Immune Irregularities to Autism, Mouse Study Suggests


Menu
The More Gray Matter You Have, the More Altruistic You Are

Hubble Discovers a Fifth Moon Orbiting Pluto

One Step Closer to New Kind of Thermoelectric 'Heat Engine'

Native American Populations Descend from Three Key Migrations, Scientists Say

Trigger for Past Rapid Sea Level Rise Discovered

Skulls Shed New Light On the Evolution of the Cat

Transforming Cancer Into a Manageable Illness With Multi-Drug Approach

The Eyes Don't Have It: New Research Into Lying and Eye Movements

Giant Fossil Turtle from Colombia Round Like Car Tire

Fossil Egg Links Dinosaurs to Modern Birds

Viruses May Be Causing Coral Bleaching and Decline Around the World

Peering Into the Heart of a Supernova: How to Detect a Rapidly Spinning Stellar Core

Physicists Invent 'Spintronic' LED

Newly Isolated 'Beige Fat' Cells Could Help Fight Obesity

Study: Wolverines Need Refrigerators

Solar System Ice: Source of Earth's Water

Attacking Biofilms That Cause Chronic Infections

Discovery of Chemical That Affects Biological Clock Offers New Way to Treat Diabetes

Vaccines Backfire: Veterinary Vaccines Found to Combine Into New Infectious Viruses

Antarctica at Risk from Human Activities

Large, Medically Important Class of Proteins Starts to Yield Its Secrets

Early Human Ancestor, Australopithecus Sediba, Fossils Discovered in Rock

First Ever Videos of Snow Leopard Mother and Cubs in Dens Recorded in Mongolia

Messy Experiment Cleans Up Cornstarch and Water Mystery

Controlling Your Computer With Your Eyes