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| Natura: | Artículo científico |
| Lingua: | en |
| Pubblicazione: |
Sociedad Geológica Mexicana, A.C.
2017
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=94352452001 |
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Sommario:
- Geoelectrical and Electromagnetic Methods Applied to Paleolimnological Studies: Two Examples from Desiccated Lakes in the Basin of Mexico Matthias Bücker Socorro Lozano García Beatriz Ortega Guerrero Margarita Caballero Liseth Pérez Lizeth Caballero Carlos Pita de la Paz Alfredo Sánchez-Galindo Francisco Jesús Villegas Adrián Flores Orozco Erik Brown Josef Werne Blas Valero Garcés Antje Schwalb Andreas Kemna Edgar Sánchez-Alvaro Norberto Launizar-Martínez Antonio Valverde-Placencia Fernando Garay-Jiménez Ciencias de la Tierra Mexico Geophysics paleolimnology lacustrine sediments electromagnetic methods Paleolimnological studies require a broad un - derstanding of the geometry and depth of the sedimentary fill of lake basins prior to coring campaigns. Seismic methods are routinely employed for the indirect characterization of lake-bottom sediments. However, the use of seismic methods might occasionally be limit - ed due to surface conditions or poor seismic contrasts between the stratigraphic units, which lead to data quality that is too poor to provide sufficient information for the selec - tion of drill sites. Sources of cultural noise are one of the main reasons why seismic methods fail in study areas near or within large cities, such as Mexico City. Under certain condi - tions, electrical and electromagnetic methods might be a suitable substitute or complement to seismic exploration, as they respond to dif - ferent physical properties of the subsurface. To evaluate the applicability of such methods, here we present two recent case studies from the desiccated lakes Chalco and Xochimilco both located in urban areas within the Basin of Mexico where electrical resistivity tomography (ERT), transient electromagnetic (TEM) and magnetotelluric (MT) soundings were conduct - ed for the characterization of lake basement and lacustrine sediments. In both examples, the results of the geophysical exploration con - tributed valuable stratigraphic information for the following drilling and core recovery, which highlights the potential of electrical and elec - tromagnetic methods in paleolimnological studies. 2017 artículo científico 1405-3322 https://www.redalyc.org/articulo.oa?id=94352452001 en http://www.redalyc.org/revista.oa?id=943 Boletín de la Sociedad Geológica Mexicana application/pdf Sociedad Geológica Mexicana, A.C. Boletín de la Sociedad Geológica Mexicana (México) Num.2 Vol.69