Quantcast
Last updated on April 16, 2014 at 8:56 EDT

Latest Continental crust Stories

Pamir Tien Shan Earthquakes And Tectonics
2013-08-27 14:07:16

Helmholtz Association Real time observation of shear waves on the Earth's surface, first direct observation of subducting continental crust during the collision of two continents Earthquake damage to buildings is mainly due to the existing shear waves which transfer their energy during an earthquake to the houses. These shear waves are significantly influenced by the underground and the topography of the surrounding area. Detailed knowledge of the landform and the near-surface...

Subduction Evidence From Billions Of Years Ago
2013-01-19 06:32:40

redOrbit Staff & Wire Reports - Your Universe Online Researchers for the first time have discovered evidence supporting the theory that the processes that act as catalysts for volcanic activity today are similar to those that occurred nearly four billion years ago. Writing in the journal Geology, Frances Jenner of the Carnegie Institution for Science and colleagues report that 3.8 billion-year-old volcanic rocks recovered from an island in southwestern Greenland support previous...

2012-03-12 21:04:59

Geologists at the Universities of Bonn and Cologne have come up with a new idea as to how the earliest continents were formed The earth's structure can be compared to an orange: its crust is the peel supported by the earth's heavy mantle. That peel is made up of a continental crust 30 to 40 kilometers thick. It is much lighter than the thinner oceanic crust and protrudes from the earth's mantle because of its lower density, like an iceberg in the sea. "According to the current theory, the...

2012-03-06 10:55:21

GEOLOGY posted ahead of print 14 Feb.—2 Mar. is a dynamic collection of papers covering modeling studies of the U.S. New Madrid Seismic Zone; landslide prediction through examination of the Slumgullion landslide, Colorado; investigation of a potential nuclear waste repository site in Finland; understanding river delta formation and long-term evolution with insights from the Mekong River, Vietnam; and an explanation of how drought drove forest decline and dune building in eastern upper...

2012-02-22 21:32:41

A mysterious cycle of booms and busts in marine biodiversity over the past 500 million years could be tied to a periodic uplifting of the world's continents, scientists report in the March issue of The Journal of Geology. The researchers discovered periodic increases in the amount of the isotope strontium-87 found in marine fossils. The timing of these increases corresponds to previously discovered low points in marine biodiversity that occur in the fossil record roughly every 60 million...

6f98c655038c55891c1e74e67e388514
2011-07-22 12:04:00

Ancient minerals tell story of planet's distant past Jewelers abhor diamond impurities, but they are a bonanza for scientists. Safely encased in super-hard diamond, impurities are unaltered, ancient minerals that tell the story of Earth's distant past. Researchers analyzed data from more than 4,000 of these mineral inclusions to find that continents started the cycle of breaking apart, drifting, and colliding about three billion years ago. The research results, published in this week's issue...

2011-07-22 01:24:22

Jewelers abhor diamond impurities, but they are a bonanza for scientists. Safely encased in the super-hard diamond, impurities are unaltered, ancient minerals that can tell the story of Earth's distant past. Researchers analyzed data from the literature of over 4,000 of these mineral inclusions to find that continents started the cycle of breaking apart, drifting, and colliding about 3 billion years ago. The research, published in the July 22, 2011, issue of Science, pinpoints when this...

2011-05-27 21:44:24

What would we see and what would we learn if we were able to cut North America in half, pull it apart, and look at the resulting cross section through the continent, from the surface all the way down to its very deepest mantle roots? Although it sounds like an impossible undertaking, Philip Hammer of the University of British Columbia and colleagues have done just that. Utilizing geological and geophysical data collected over more than 20 years as part of the Canadian LITHOPROBE project,...

2011-04-04 17:00:51

Geologists have long-debated about when plate tectonics started on the planet. One of the key indicators has been whether or not fragments of oceanic crust, generated at sea-floor spreading centers, are preserved in the planet's oldest crust. New research integrating what has been learned about the variations in modern sea floor spreading environments with the geological record of the oldest preserved crust on Earth shows that many belts in these ancient terrains have striking similarities to...

2011-01-13 17:49:30

The continental crust is the principal record of conditions on the Earth for the last 4.4 billion years. Its formation modified the composition of the mantle and the atmosphere, it supports life, and it remains a sink for carbon dioxide through weathering and erosion. The continental crust therefore has had a key role in the evolution of the Earth, and yet the timing of its generation remains the topic of considerable debate. It is widely believed that the juvenile continental crust has grown...