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Melting Crust Makes Rich Mineral Deposits: Geologist
Toronto - Oct 18, 2002 A University of Toronto study suggests why giant gold and copper deposits are found at some volcanoes but not others, a finding that could point prospectors to large deposits of these and other valuable metals. "There's one characteristic that is common to all of these big gold and copper deposits anywhere in the world," says Professor James Mungall of the Department of Geology. The ocean's crust that is pushed down under a volcano starts to melt, which it doesn't normally do. His study, which appears in the October issue of Geology, examines the "Rim of Fire" volcanoes that surround the Pacific Ocean. Mungall suggests that rich mineral deposits occur only when a slab of ocean floor slides underneath a continent or another part of the ocean floor and melts from the heat of the earth's interior. The slab may get stuck long enough to melt or it may scrape along almost horizontally under the volcano, melting and causing the release of the metals to produce gold or copper deposits that are close enough to the surface for mining. "These findings could help to identify regions where these rich deposits are most likely to be present," says Mungall. The research was funded by the Natural Sciences and Engineering Research Council of Canada. Community Email This Article Comment On This Article Related Links Geology At Toronto SpaceDaily Search SpaceDaily Subscribe To SpaceDaily Express Dirt, rocks and all the stuff we stand on firmly
Magnetic Reconnection Region Larger Than 2.5 Million Km Found In The Solar Wind
Paris (ESA) Jan 12, 2006Using the ESA Cluster spacecraft and the NASA Wind and ACE satellites, a team of American and European scientists have discovered the largest jets of particles created between the Earth and the Sun by magnetic reconnection. This result makes the cover of this week's issue of Nature. |
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