Magnetotelluric applied to the study of the Guaraní Aquifer in Entre Ríos Province, Argentina.

FAVETTO ALICIA; CURCIO ANA; POMPOSIELLO CRISTINA

JOURNAL OF SOUTH AMERICAN EARTH SCIENCES

Elsevier

Año: 2010

0895-9811

<!-- /* Font Definitions */ @font-face {font-family:SimSun; panose-1:2 1 6 0 3 1 1 1 1 1; mso-font-alt:宋体; mso-font-charset:134; mso-generic-font-family:auto; mso-font-format:other; mso-font-pitch:variable; mso-font-signature:1 135135232 16 0 262144 0;} @font-face {font-family:EFPEFJ+TimesNewRoman; panose-1:0 0 0 0 0 0 0 0 0 0; mso-font-alt:"Times New Roman"; mso-font-charset:0; mso-generic-font-family:roman; mso-font-format:other; mso-font-pitch:auto; mso-font-signature:3 0 0 0 1 0;} @font-face {font-family:"@SimSun"; panose-1:0 0 0 0 0 0 0 0 0 0; mso-font-charset:134; mso-generic-font-family:auto; mso-font-format:other; mso-font-pitch:variable; mso-font-signature:1 135135232 16 0 262144 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; text-align:justify; mso-pagination:none; font-size:10.5pt; mso-bidi-font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:SimSun; mso-font-kerning:1.0pt; mso-ansi-language:EN-US; mso-fareast-language:ZH-CN;} p.MsoBodyText, li.MsoBodyText, div.MsoBodyText {mso-style-next:Normal; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; mso-layout-grid-align:none; text-autospace:none; font-size:12.0pt; font-family:EFPEFJ+TimesNewRoman; mso-fareast-font-family:"Times New Roman"; mso-bidi-font-family:"Times New Roman";} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> The Guaraní Aquifer System (SAG) is one of the most important transboundary groundwater reservoirs covering an area larger than a million square kilometers. The system covers the entire Paraná basin and part of the Chaco-Paraná basin. The geological units closely related to the SAG are the Piramboia and Botucatu Formations that consist of Triassic-Jurassic aeolian, fluvial and lacustrine sandstones, and the Serra Geral basalts with clastic intercalations. Serra Geral, an effusive Cretaceous complex, covers the sandstones and provides a high degree of confinement to the system. This paper presents the interpretation of magnetotelluric (MT) data collected during 2007-2008 in Entre Ríos Province, Argentina. These data mainly provide new estimates of the depth to the crystalline basement, determinant for the presence of sediments in this area. For each profile, the electrical resistivity model successfully determines the basement-sediment boundary but the discrimination of the basalts strongly depends on local characteristics. The models are quite consistent with current information from oil and thermal wells located near the profiles.