dc.creatorBurd, Aurora I.
dc.creatorBooker, John R.
dc.creatorMackie, Randall
dc.creatorPomposiello, Maria Cristina
dc.creatorFavetto, Alicia Beatriz
dc.date.accessioned2017-06-16T21:37:20Z
dc.date.accessioned2018-11-06T12:24:04Z
dc.date.available2017-06-16T21:37:20Z
dc.date.available2018-11-06T12:24:04Z
dc.date.created2017-06-16T21:37:20Z
dc.date.issued2013-08
dc.identifierBurd, Aurora I.; Booker, John R.; Mackie, Randall; Pomposiello, Maria Cristina; Favetto, Alicia Beatriz; Electrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window; American Geophysical Union; Geochemistry Geophysics Geosystems; 14; 8; 8-2013; 3192-3209
dc.identifier1525-2027
dc.identifierhttp://hdl.handle.net/11336/18376
dc.identifierCONICET Digital
dc.identifierCONICET
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1866126
dc.description.abstractWe present a three-dimensional (3-D) interpretation of 117 long period (20–4096 s) magnetotelluric (MT) sites between 31°S and 35°S in western Argentina. They cover the most horizontal part of the Pampean shallow angle subduction of the Nazca Plate and extend south into the more steeply dipping region. Sixty-two 3-D inversions using various smoothing parameters and data misfit goals were done with a nonlinear conjugate gradient (NLCG) algorithm. A dominant feature of the mantle structure east of the horizontal slab is a conductive plume rising from near the top of the mantle transition zone at 410 km to the probable base of the lithosphere at 100 km depth. The subducted slab is known to descend to 190 km just west of the plume, but the Wadati-Benioff zone cannot be traced deeper. If the slab is extrapolated downdip it slices through the plume at 250 km depth. Removal of portions of the plume or blocking vertical current flow at 250 km depth significantly changes the predicted responses. This argues that the plume is not an artifact and that it is continuous. The simplest explanation is that there is a “wedge”-shaped slab window that has torn laterally and opens down to the east with its apex at the plume location. Stress within the slab and seismic tomography support this shape. Its northern edge likely explains why there is no deep seismicity south of 29°S.
dc.languageeng
dc.publisherAmerican Geophysical Union
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1002/ggge.20213
dc.relationinfo:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/ggge.20213/abstract
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectTHREE-DIMENSIONAL MAGNETOTELLURIC INVERSION
dc.subjectSLAB WINDOW
dc.subjectNAZCA FLAT SLAB SUBDUCTION
dc.titleElectrical conductivity of the Pampean Shallow Subduction Region of Argentina near 33 S: evidence for a slab window
dc.typeArtículos de revistas
dc.typeArtículos de revistas
dc.typeArtículos de revistas


Este ítem pertenece a la siguiente institución