Rock shows earth got off to hot start


	Rock shows earth got off to hot start

pokkets

10-22-2008 8:36 PM

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/f64ca5e0-1dbf-4df8-a2d6-e5b1fa593b41/6A526534-21D0-4215-BBF8-37DF0ACFE319/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.abc.net.au/science/articles/2008/10/20/2396053.htm?site=science&topic=latest" href="http://www.abc.net.au/science/articles/2008/10/20/2396053.htm?site=science&topic=latest" style="font-size: 11px;">www.abc.net.au</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2008/10/20/2396053.htm?site=science&topic=latest"><A href="http://www.abc.net.au/profiles/content/s2193255.htm?site=science">Dani Cooper</A></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2008/10/20/2396053.htm?site=science&topic=latest"><P class="first">A geological controversy over how a 2700-million-year-old rock was formed has been solved using synchrotron technology, an international team reports.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2008/10/20/2396053.htm?site=science&topic=latest"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.abc.net.au/img/48F484CB-DC5F-4302-8E54-A76C677FE12D" alt="lava flow" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2008/10/20/2396053.htm?site=science&topic=latest"><P>The team reports in the latest <A target="_blank" href="http://www.nature.com"><EM>Nature</EM></A> journal that a rare form of magmatic rock known as komatiite was formed in the earth's mantle at temperatures around 1700°C in the Archaean age, more than 2700 million years ago.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2008/10/20/2396053.htm?site=science&topic=latest"><P>Australian co-author Associate Professor Leonid Danyushevsky, at the <A target="_blank" href="http://www.arc.gov.au">Australian Research Council</A> Centre of Excellence in Ore Deposits at the <A target="_blank" href="http://www.utas.edu.au/">University of Tasmania</A>, says the finding settles a long-disputed controversy over the volcanic rocks origin.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2008/10/20/2396053.htm?site=science&topic=latest"><P>The first "hot-melting" model assumes the komatiite was formed through the melting of a mantle source at temperatures up to 500°C hotter than today's mantle temperature.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.abc.net.au/science/articles/2008/10/20/2396053.htm?site=science&topic=latest"><P>Under the second "wet-melting" theory komatiites were formed at temperatures only slightly higher than today's mantle temperature and cooled by the presence of water.</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/6A526534-21D0-4215-BBF8-37DF0ACFE319/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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