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<datestamp>2018-01-11</datestamp>
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<title lang=en>Structure of the hydrothermal root zone of the sheeted dikes in fast-spread oceanic crust : a core-log integration study of ODP hole 1256D, Eastern Equatorial Pacific</title>
<creator>Violay, Marie</creator>
<creator>Pezard, Philippe</creator>
<creator>Ildefonse, Benoit</creator>
<creator>Celerier, Bernard</creator>
<creator>Deleau, Agathe</creator>
<contributor>Transferts en milieux poreux ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Manteau et Interfaces ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<source>Ofioliti</source>
<identifier>hal-00757592</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00757592</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00757592</source>
<source>Ofioliti, 2012, 37 (1), pp.1-11. 〈10.4454/ofioliti.v37i1.402〉</source>
<identifier>DOI : 10.4454/ofioliti.v37i1.402</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.4454/ofioliti.v37i1.402</relation>
<language>en</language>
<subject lang=en>ODP</subject>
<subject lang=en>IODP</subject>
<subject lang=en>Hole 1256D</subject>
<subject lang=en>mid-oceanic ridge</subject>
<subject lang=en>upper oceanic crust sheeted dike complex</subject>
<subject lang=en>electrical borehole images hydrothermal system</subject>
<subject lang=en>fractures</subject>
<subject lang=en>dikes</subject>
<subject lang=en>veins</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Ocean Drilling Program Hole 1256D reached for the first time the transition zone between the sheeted dike complex and the uppermost gabbros. The recovered crustal section offers a unique opportunity to study the deepest part of the hydrothermal system in present-day oceanic crust. We present a structural analysis of electrical borehole wall images. We identified, and measured the orientations of four categories of structures: major faults, minor fractures, possibly hydrothermal veins, and dikes. All structures tend to strike parallel to the paleo-ridge axis. Three major fault zones (meter thick) and dikes are steeply dipping (~ 75° on average) outward the ridge. Centimeter-thick moderately conductive planar features are interpreted as hydrothermal veins, are organized in arrays of consistent spacing, thickness, and orientation, and are dipping about 15-20° toward the ridge. This structural pattern is interpreted as an on-axis paleohydrothermal circulation system, with vertical, dike-parallel fractures, and sub-horizontal high-temperature hydrothermal veins at the base of the sheeted dike, which was subsequently rotated ~ 15° westward around a ridge-parallel, sub-horizontal axis. This rotation can be caused by upper-crustal block rotation along a listric normal fault, and/or subsidence at the ridge axis.</description>
<date>2012-06</date>
</dc>
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