Geochemists may have tapped into deep rock undisturbed sinceshortly after the planet formed
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From: Yousuf Khan on 13 Aug 2010 10:50 On 12/08/2010 11:33 PM, Sam Wormley wrote: > Earth's Oldest Cranny Explored > Geochemists may have tapped into deep rock undisturbed since shortly > after the planet formed > > http://news.sciencemag.org/sciencenow/2010/08/earths-oldest-cranny-explored.html?etoc > Yup, I posted this a couple of days back regarding this discovery too: These rocks would have originated only 100 million years after the Earth formed. *** BBC News - Arctic rocks may contain oldest remnants of Earth "They collected the lava samples from Greenland and Baffin Island in the Canadian Arctic. Although they erupted only 60 million years ago, the lavas contain a chemical signature of a far more ancient source. They show that beneath the Arctic today are small pieces of mantle - the toffee-like layer below the crust - that have survived unchanged since shortly after the formation of the Earth. " http://www.bbc.co.uk/news/science-environment-10941026 *** This entire region of the Earth, the Canadian arctic, seems to be the African Rift Valley of ancient rocks, much like the African Rift Valley is the hotbed of paleontology. The previous oldest rocks were discovered in this region too, from 4.28 Gyr ago, and prior to that the oldest were 4.03 Gyr ago, also from this region. *** BBC NEWS | Science & Environment | Team finds Earth's 'oldest rocks' "Earth's most ancient rocks, with an age of 4.28 billion years, have been found on the shore of Hudson Bay, Canada." http://news.bbc.co.uk/2/hi/science/nature/7639024.stm *** There you have it. Yousuf Khan |