Magma flow directions in the sheeted dike complex at superfast spreading mid-ocean ridges: Insights from IODP Hole 1256D, Eastern Pacific

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dc.contributor.authorVeloso, Eugenio E.
dc.contributor.authorHayman, Nicholas W.
dc.contributor.authorAnma, Ryo
dc.contributor.authorTominaga, Masako
dc.contributor.authorGonzalez, Rodrigo T.
dc.contributor.authorYamazaki, Toshitsugu
dc.contributor.authorAstudillo, Natalia
dc.date.accessioned2025-01-23T21:47:14Z
dc.date.available2025-01-23T21:47:14Z
dc.date.issued2014
dc.description.abstractIntegrated Ocean Drilling Program (IODP) Hole 1256D successfully sampled a complete section of an intact oceanic crustal sheeted dike complex (SDC) (from 1061 to 1320 meters below seafloor; mbsf) on a 15 Ma old Cocos Plate. A series of rock magnetic measurements were carried out to understand the magmatic processes that accreted this end-member, superfast-spread (200 mm/yr full rate) oceanic crust. Results indicate that main ferromagnetic minerals are predominantly pseudo single-domain (titano)magnetite crystals, responsible for both anisotropy of magnetic susceptibility (AMS) and magnetic remanence signals. AMS fabrics were reoriented into a geographic reference frame using magnetic remanence data, and corrected for a counterclockwise rotation of the Cocos Plate relative to the East Pacific Rise (EPR) ca. 15 Ma. Corrected AMS fabrics were then compared with the orientations of chilled margins previously obtained from Formation MicroScanner (FMS) images of the SDC at Hole 1256D. For some samples taken from close to dike margins, a dike-normal orientation of the minimum AMS axes (K-min) of prolate AMS ellipsoids mean that the long axis (K-max) can be used to infer magma flow directions. Subvertical K-min orientations in the interior of the dikes, however, may have required settling or compaction of the magma shortly after intrusion, thus rearranging the AMS fabric. Despite this orientation of K-min axes, orientation of K-max axes indicate a rather constant subhorizontal paleo-flow direction, suggesting that magmas most probably traveled to the surface considerable distances from source regions within the EPR system.
dc.fuente.origenWOS
dc.identifier.doi10.1002/2013GC004957
dc.identifier.issn1525-2027
dc.identifier.urihttps://doi.org/10.1002/2013GC004957
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101737
dc.identifier.wosidWOS:000336493400027
dc.issue.numero4
dc.language.isoen
dc.pagina.final1295
dc.pagina.inicio1283
dc.revistaGeochemistry geophysics geosystems
dc.rightsacceso restringido
dc.subjectsheeted dike complex
dc.subjectsuperfast-spread oceanic crust
dc.subjectintegrated Ocean Drilling Program Hole 1256D
dc.subjectEast Pacific Ridge
dc.subjectsheeted dike complex emplacement
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleMagma flow directions in the sheeted dike complex at superfast spreading mid-ocean ridges: Insights from IODP Hole 1256D, Eastern Pacific
dc.typeartículo
dc.volumen15
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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