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Crustal fissuring on the crest of the southern East Pacific Rise at 17°15′–40′S

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dc.creator Wright, Dawn J.
dc.creator Haymon, Rachel M.
dc.creator White, Scott M.
dc.creator Macdonald, Ken C.
dc.date.accessioned 2012-02-17T19:29:13Z
dc.date.available 2012-02-17T19:29:13Z
dc.date.issued 2002
dc.identifier.citation Wright, D. J., R. M. Haymon, S. M. White, and K. C. Macdonald (2002), Crustal fissuring on the crest of the southern East Pacific Rise at 17°15′–40′S, J. Geophys. Res., 107(B5), 2104, doi:10.1029/2001JB000544. en_US
dc.identifier.uri http://hdl.handle.net/1957/27817
dc.description This is the publisher’s final pdf. The published article is copyrighted by the American Geophysical Union and can be found at: http://www.agu.org/journals/jgr/. en_US
dc.description.abstract Fissure densities and widths have been mapped along the axial zone of the superfast spreading southern East Pacific Rise (EPR) at 17°15′–40′S with the near-bottom DSL-120 and Argo II imaging systems. We observe that the youngest lava flows (on a relative age scale) are sparsely fissured and that there is a cumulative increase in fissure abundance with time that produces a strong positive correlation between fissure density and relative age of lava flows. Average fissure widths were used to estimate fissure depths. In the 17°15′–40′S area, calculated fissure depths are estimated to extend below the seismic layer 2A/2B boundary, and fissures are widest/deepest where lava flows are youngest. We interpret these wide fissures in relatively young flows to be eruptive fissures. Relatively young lava flows combined with high average fissure widths south of 17°25′S suggest that there may have been recent dike propagation along the ridge crest in this area. In comparison to the northern EPR at 9°–10°N the density of fissuring on the southern EPR is significantly higher, due in part to the higher occurrence of relatively older, more areally restricted pillow lava flows. en_US
dc.description.sponsorship D.J.W. was supported by NSF grant OCE-9521039 and R.M.H., S.M.W., and K.C.M. by NSF/OCE-9416996 and NSF/OCE-9816021. en_US
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.ispartofseries Journal of Geophysical Research en_US
dc.relation.ispartofseries Vol. 107 no. B5 en_US
dc.subject fissures en_US
dc.subject fractures en_US
dc.subject mid-ocean ridges en_US
dc.subject southern East Pacific Rise en_US
dc.subject tectonic cycle en_US
dc.title Crustal fissuring on the crest of the southern East Pacific Rise at 17°15′–40′S en_US
dc.type Article en_US
dc.description.peerreview yes en_US
dc.identifier.doi 10.1029/2001JB000544


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