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Magnetotelluric exploration of the Wagner Basin, Gulf of California, Mexico: Evidence for an axial magma chamber and hydrothermal circulation

TitleMagnetotelluric exploration of the Wagner Basin, Gulf of California, Mexico: Evidence for an axial magma chamber and hydrothermal circulation
Publication TypeJournal Article
Year of Publication2020
AuthorsEsquivel T.A, Flores C., Ortega V.R, Constable S, Gomez-Trevino E., Gonzalez-Fernandez A.
Volume99
Date Published2020/04
Type of ArticleArticle
ISBN Number0895-9811
Accession NumberWOS:000528182600021
Keywordsbeneath; east pacific rise; electrical resistivity; Geology; geometry; Heat flow correlation; inversion; Marine magnetotellurics; northern; part
Abstract

Different geological and geophysical disciplines have suggested the Wagner Basin as a promising location of geothermal resources. As a reconnaissance tool Magnetotelluric (MT) data were measured at 10 sites along a profile over this basin in the northern Gulf of California. The subsurface distribution of electric resistivity was estimated with two-dimensional smooth inversion using the apparent resistivities and phases from both field polarizations. We found a deep conductor underneath the center of the basin, interpreted as a region of partial melt feeding the accretion zone of this incipient oceanic crust. From six MT sites with close-by heat flow measurements, we also found a positive correlation between the interpreted shallow (first 100 m) low resistivities and high heat flows. This shows that the MT method can be used to map submarine heat sources.

DOI10.1016/j.jsames.2020.102501
Student Publication: 
No