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dc.contributor.authorDziak, Robert P.  Concept link
dc.contributor.authorSmith, Deborah K.  Concept link
dc.contributor.authorBohnenstiehl, DelWayne R.  Concept link
dc.contributor.authorFox, Christopher G.  Concept link
dc.contributor.authorDesbruyeres, Daniel  Concept link
dc.contributor.authorMatsumoto, Haru  Concept link
dc.contributor.authorTolstoy, Maya  Concept link
dc.contributor.authorFornari, Daniel J.  Concept link
dc.date.accessioned2010-05-27T13:01:41Z
dc.date.available2010-05-27T13:01:41Z
dc.date.issued2004-12-04
dc.identifier.citationJournal of Geophysical Research 109 (2004): B12102en_US
dc.identifier.urihttps://hdl.handle.net/1912/3539
dc.descriptionAuthor Posting. © American Geophysical Union, 2004. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 109 (2004): B12102, doi:10.1029/2004JB003141.en_US
dc.description.abstractMid-ocean ridge volcanic activity is the fundamental process for creation of ocean crust, yet the dynamics of magma emplacement along the slow spreading Mid-Atlantic Ridge (MAR) are largely unknown. We present acoustical, seismological, and biological evidence of a magmatic dike intrusion at the Lucky Strike segment, the first detected from the deeper sections (>1500 m) of the MAR. The dike caused the largest teleseismic earthquake swarm recorded at Lucky Strike in >20 years of seismic monitoring, and one of the largest ever recorded on the northern MAR. Hydrophone records indicate that the rate of earthquake activity decays in a nontectonic manner and that the onset of the swarm was accompanied by 30 min of broadband (>3 Hz) intrusion tremor, suggesting a volcanic origin. Two submersible investigations of high-temperature vents located at the summit of Lucky Strike Seamount 3 months and 1 year after the swarm showed a significant increase in microbial activity and diffuse venting. This magmatic episode may represent one form of volcanism along the MAR, where highly focused pockets of magma are intruded sporadically into the shallow ocean crust beneath long-lived, discrete volcanic structures recharging preexisting seafloor hydrothermal vents and ecosystems.en_US
dc.description.sponsorshipThis study was made possible through the support of the U.S. National Science Foundation (grants OCE-9811575, OCE- 0137164, and OCE-0201692) and the NOAA Vents Program.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2004JB003141
dc.subjectMid-Atlantic Ridgeen_US
dc.subjectEarthquakeen_US
dc.subjectHydroacousticen_US
dc.titleEvidence of a recent magma dike intrusion at the slow spreading Lucky Strike segment, Mid-Atlantic Ridgeen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2004JB003141


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