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Geotimes September 2003 Sara Pratt |
Zircons reveal mantle evolution A team of Finnish geologists has discovered 3.1 billion-year-old zircons in the Jormua ophiolite of eastern Finland. Although not the oldest zircons on Earth, the Jormua zircons are the oldest yet found in mantle rocks. Their discovery has given scientists a brief glimpse into the history of early plate tectonics. |
Geotimes November 2003 Naomi Lubick |
Turkish tectonics Researchers recently published preliminary results of the first data collected with modern techniques documenting the tectonic and seismic regimes of eastern Turkey. Their work may overturn conceptions of the tectonic setting of the region. |
Chemistry World May 28, 2014 Ian Randall |
Earth's earliest continent formed like Iceland The Earth's first continents may have formed in a geological setting similar to modern-day Iceland, according to the geochemical analysis of a newly discovered rock unit from Canada. |
Geotimes September 2007 Nicole Branan |
Understanding the Crust Beneath Iran The most recent continent-continent collision on Earth began about 10 to 20 million years ago when the Arabian Plate slammed into Eurasia in what is modern-day Iran. An international team of researchers has brought to light an important piece of this ancient history. |
Geotimes October 2004 |
California's Moho The southern Sierra Nevada mountain range in California has an anomalously thin crust and using seismic imaging, geologists have observed that something is missing. |
Geotimes May 2007 Kathryn Hansen |
Deep Earth May Hold an Ocean Earth's deep interior, more than 1,000 kilometers below the surface in the mantle, could prove to be a watery place. That's the conclusion researchers drew from an anomaly uncovered by the first global map of Earth's lower mantle, using a new type of seismic analysis. |
Geotimes February 2005 Joshua Zaffos |
Mid-Ocean Ridge Spread or Jam? Different spreading geologic ridges move at different rates, and new research may explain how changes in spreading rates affect heat distribution and crust development at the ridges, particularly the slow ones. |
Geotimes July 2004 Jay Chapman |
Squishy plates Using groundbreaking satellite techniques, new research suggests continental crust reacts to strain more like toothpaste than rigid blocks of rock. |
Chemistry World July 22, 2011 David Bradley |
Cracking diamonds reveals continental origins An analysis of the mineral inclusions in diamonds dredged up by eruptions from deep within the Earth has allowed scientists to get a handle on when the process of plate tectonics began. |
Geotimes June 2005 Naomi Lubick |
Double-Crossing the Core A team of scientists has taken the properties of a mineral from the Earth's lower mantle, together with seismic observations of the core-mantle boundary, to propose a new model that could elucidate the heat engine that drives Earth. |
Geotimes July 2006 Carolyn Gramling |
Afar From Close-up Powerful stresses in the crust lead to frequent earthquakes and volcanism in the Afar Depression of northeastern Ethiopia. Researchers now say that the source of this activity reveals a possible new connection in Earth's interior. |
Geotimes November 2007 Carolyn Gramling |
How Does Your Continent Grow? Data from ancient mantle rocks are helping to shore up the hypothesis that the continental crust was extracted in pulses, during periodic large melting events in the mantle. |
Geotimes October 2006 Carolyn Gramling |
Flexing Plates Produce Volcanoes There's a new kind of volcano in town, according to a new study. |
Geotimes April 2007 Nicole Branan |
Found: Tibet's Missing Anchor Through new seismic work, researchers may have found a clue to why the Tibetan Plateau is as high as it is. A chunk of upper mantle that's been "missing" for some 15 million years may have contributed to the region's uplift, they say. |
Geotimes July 2004 Sara Pratt |
Core Compositions Scientists are working to explain the differences in composition between Earth and Mars. |
Chemistry World May 11, 2006 Jon Evans |
Sea Water Assumes the Xenon Mantle Geochemists have uncovered evidence that sea water incorporates noble gases into the Earth's mantle, overturning current theories of how noble gases are transported beneath the crust. |
Geotimes September 2006 Lisa Rossbacher |
Big Lonesome Mountain What makes Gros Morne National Park so special is that its stories match the experience each visitor brings. The more geology you know, the more you will see and the richer the visit will be, but the geology meets all visitors at their own level. |
Geotimes September 2006 Carolyn Gramling |
Donald Forsyth: At Play in the Field Forsyth emphasizes that collaborating with students and other researchers is not only important to solving tough geological puzzles, but also is much of the fun. |
Geotimes January 2007 Nicole Branan |
Heat Flow Causes Magnetic Reversals Earth's magnetic field has done hundreds of somersaults over the last few billion years. A new study sheds some light on what causes the geomagnetic field to flip. |
Geotimes June 2007 Hansen & Gramling |
Are Volcanoes Picky Eaters? New measurements of the concentrations of elements within magma suggest a volcano's food may be a complex recipe -- and that what kind of magma a volcano prefers may affect its physical features, including the size to which it can grow, according to new research |
Chemistry World December 4, 2013 James Urquhart |
Diamonds' redox reaction origins revealed Subduction zones -- boundaries between tectonic plates where the Earth's crust sinks into the hot mantle -- could be breeding grounds for diamond formation, according to Russian researchers. |
Geotimes July 2007 Carolyn Gramling |
X-ray Eyes in the Sky Scientists are working on the next generation of low-orbiting satellites that they hope will see far past the Earth's surface and into its interior, to better understand the structure and composition of Earth's crust, mantle and core. |
Geotimes September 2005 Sara Pratt |
Sourcing Ultradeep Diamonds Mineral impurities in a diamond may decrease the gem's value for jewelers, but for geologists they can prove to be priceless: South African diamonds containing garnet have recently provided evidence that very deep diamonds can form from surface materials. |
National Defense September 2010 Grace V. Jean |
Scientists Say They Are Closer Than Ever to Predicting Earthquakes Researchers have discovered that there are warning signs that can be detected in the weeks and hours prior to temblors. |
Geotimes November 2005 Sara Pratt |
Super-Rotation for Earth's Core A new earthquake study supports the 1996 finding that Earth's inner core is spinning faster than the planet's mantle and crust -- at a rate detectable on human timescales, but about one-third of the rate first suggested. |
Scientific American March 2005 Madhusree Mukerjee |
The Scarred Earth Tsunami-spawning quake leaves geophysical changes. |
Geotimes February 2004 Naomi Lubick |
Pursuing plumes Geophysicists recently presented improved methods for imaging mantle plumes, providing the strongest evidence yet that some plumes extend all the way down to the coremantle boundary. |
Chemistry World February 26, 2014 Emma Stoye |
Yellowstone spews out ancient helium Researchers have found that huge amounts of helium are being released through steam plumes in the US's Yellowstone National Park, having been stored in the Earth's crust for billions of years. |
Geotimes July 2006 Carolyn Gramling |
Earth Soaks up Seawater Geologists have long thought that seawater does not travel very far through Earth's interior A new geochemical study, however, is challenging that notion, saying that traces of seawater exist deep inside the planet. |