Quakes Under Pacific Ocean Floor Reveal Unexpected Circulation System


	Quakes Under Pacific Ocean Floor Reveal Unexpected Circulation System

amgumen

1-16-2008 8:32 PM

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tags:

geology, ocean

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1-18-2008 5:59 AM

pokkets

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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/74e579be-dfa5-4c61-bb35-93512d6686ac/D029D488-23D2-42E2-8899-C4CF6B30FBA8/" 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.nsf.gov/news/mmg/media/images/vents_h1.jpg" href="http://www.nsf.gov/news/mmg/media/images/vents_h1.jpg" style="font-size: 11px;">www.nsf.gov</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.nsf.gov/news/mmg/media/images/vents_h1.jpg"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.nsf.gov/img/EAE59129-7305-43A5-82C8-AA316A9A37A3" alt="http://www.nsf.gov/news/mmg/media/images/vents_h1.jpg" /></div></blockquote><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://content7.clipmarks.com/images/clip-icon.gif" 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.nsf.gov/discoveries/disc_summ.jsp?cntn_id=110976&org=NSF" href="http://www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=110976&org=NSF" style="font-size: 11px;">www.nsf.gov</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=110976&org=NSF"><P>Zigzagging some 60,000 kilometers across the ocean floor, Earth's system of mid-ocean ridges plays a pivotal role in many workings of the planet: in plate-tectonic movements, heat flow from the interior, and the chemistry of rock, water and air. </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.nsf.gov/discoveries/disc_summ.jsp?cntn_id=110976&org=NSF">The systems pull in cold water, superheat it, then spit it back out from seafloor vents--a process that brings up not only hot water, but dissolved substances from rocks below. Unique life forms feed off the vents' stew, and valuable minerals including gold may pile up.</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.nsf.gov/discoveries/disc_summ.jsp?cntn_id=110976&org=NSF">water moves a lot faster than previously thought--perhaps a billion gallons per year--through these systems. The water appears to descend instead through a buried 200-meter-wide chimney atop the ridge studied on the East Pacific Rise, run below the ridge along its axis through a tunnel just above a magma chamber, then bubble back up through a series of vents further along the ridge.</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/D029D488-23D2-42E2-8899-C4CF6B30FBA8/blog/" title="blog or email this clip"><img src="http://content8.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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