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post by science - 09/22/2012
http://usa.r360.com/coil-web/rest/files/contents/53641941

50-Million-Year-Old Redwood Chunk Found in Diamond Mine
Diamonds are not something you associate with the pacific (or Canadian interior) area at all, but ... we all learn new things
The wood was found a few years ago in a kimberlite pipe, named the Panda pipe, over 1,000 feet (315 meters) below Earth's surface at the Ekati diamond mine, just south of the Arctic Circle in Canada's Northwest Territories, the researchers say. A kimberlite pipe, a type of volcanic pipe, forms when kimberlite magma pushes through deep fractures in the Earth's crust to create a vertical tubelike structure that's wider at the top like a carrot. Kimberlites have the deepest origins of all magmas on Earth and when they cool, they leave behind rocks dense in crystals, sometimes holding diamonds.

 The researchers, who report their findings in a Sept. 19 paper in the journal PLoS ONE, say the site of the Panda pipe was covered with a forest of Metasequoia, similar to today's dawn redwoods, during the early Eocene. The kimberlite eruption that occurred there about 53.3 million years ago opened a hole in the Earth's surface, sucking in some of those redwoods. Lead author of the study Alex Wolfe of the University of Alberta explained that open space along the side of this hole allowed the trees to tumble far inside. "Then it cooled, and the wood was locked in the volcanic rock,"

read more.   it's interesting




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