Perforación profunda en el lago de Chalco: reporte técnico

Lozano‐García, Socorro; Brown, E. T.; Ortega, Beatríz; Caballero, Margarita; Werne, Josef P.; Fawcett, Peter J.; Schwalb, Antje; Valero‐Garcés, Blas L.; Schnurrenberger, Douglas W.; ́Grady, Ryan O; Stockhecke, Mona; Steinman, Byron A.; Cabral‐Cano, E.; Caballero, Carmen; Sosa-Nájera, Susana; Soler, Ana María; Pérez, Liseth; Noren, Anders; Myrbo, Amy; Bücker, Matthias; Wattrus, N. J.; Arciniega, A.; Wonik, Thomas; Watt, Sebastian; Kumar, Dervla Meegan; Acosta, Carmen Rosa Delgado; Martínez, Ivan Montaño; Cossio, Rafael; Ferland, Troy; Vergara-Huerta, F.

doi:10.18268/bsgm2017v69n2a2

Cited by 25 publications

(12 citation statements)

References 9 publications

(11 reference statements)

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“…Szarka, 1988). Along with the resistivity models, Figure 11 shows the preliminary magnetic susceptibility scan of core "A" and the main lithological contacts observed during drilling operations (Lozano-García et al, 2017). Besides a peak at approximately 20 m depth, the magnetic susceptibility shows low values from the surface down to 90-100 m reflecting the low amount of volcaniclastic deposits within the lacustrine sediments.…”

Section: Results and Interpretationmentioning

confidence: 99%

“…However, under certain circumstances, possibilities to carry out (active) seismic surveys might be limited or the quality of the seismic data might not be sufficient for the project's purpose (e.g. Lozano-García et al, 2017). Amongst other, limiting factors can be (1) insufficient contrasts among the seismic velocities of geologic materials, (2) the presence of gas-charged lake-floor sediments that act as a strong reflector and mask underlying sediments (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…vertical electrical soundings, seismic refraction) also does not cover larger depths with the gravity data being the only exception (Campos-Enríquez et al, 1997 and references therein). In consequence, Brown et al (2012) state a possible insufficiency of the existing geophysical data for the selection of a suitable site for a planned 500 m drilling to recover the sedimentary record of the sub-basin of Chalco (Lozano-García et al, 2017). In order to fill this gap, a recent seismic survey (Vergara-Huerta, 2015) used the horizontal-to-vertical (H/V) ambient-noise method to provide a new estimate of the depth to bedrock in the surroundings of the later drilling site.…”

Section: Introductionmentioning

confidence: 99%

“…However, the results of this study indicate a much smaller thickness of approximately 100-150 m of lacustrine sediments. Because combined MT and TEM surveys helped to constrain the geometry of the geological units down to at least 800 m (Chouteau et al, 1994;Krivochieva and Chouteau, 2003), one MT and several TEM soundings were measured shortly before the start of the MexiDrill campaign in April 2016 (Lozano-García et al, 2017) to provide additional geophysical information.…”

Section: Introductionmentioning

confidence: 99%

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" Geoelectrical and Electromagnetic Methods Applied to Paleolimnological Studies: Two Examples from Desiccated Lakes in the Basin of Mexico"

Bücker

García

Guerrero

et al. 2017

BSGM

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RESUMEN ABSTRACTPaleolimnological studies require a broad understanding 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 limited 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 selection 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 conditions, electrical and electromagnetic methods might be a suitable substitute or complement to seismic exploration, as they respond to different 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 conducted for the characterization of lake basement and lacustrine sediments. In both examples, the results of the geophysical exploration contributed valuable stratigraphic information for the following drilling and core recovery, which highlights the potential of electrical and electromagnetic methods in paleolimnological studies.

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Section: Results and Interpretationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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" Geoelectrical and Electromagnetic Methods Applied to Paleolimnological Studies: Two Examples from Desiccated Lakes in the Basin of Mexico"

Bücker

García

Guerrero

et al. 2017

BSGM

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“…Cubriendo a las rocas miocénicas se encuentran depósitos volcánicos del Plioceno al Holoceno que también están relacionados con la FVTM (Figura 1b), los cuales afloran en la Sierra de las Cruces (Arce et al, 2008), Sierra Nevada (Macías et al, 2012) y Sierra Chichinautzin (Bloomfield, 1975;Wallace y Carmichael 1999;Márquez et al, 1999;Siebe, 2000;Siebe et al, 2005;Guilbaud et al, 2009, Agustín-Flores et al, 2011. Finalmente, en la cima de la columna existen sedimentos lacustres del Pleistoceno al Holoceno (Lozano-García et al, 1993, Figura 1b;Lozano-García y Ortega-Guerrero, 1998;Brown et al, 2012;Lozano-García et al, 2017).…”

Section: Estratigrafía En El Centro De La Cuenca De Méxicounclassified

Análisis de fracturas geológicas en el pozo Agrícola Oriental 2C, Ciudad de México y su relación con fallas mayores

Vásquez-Serrano¹,

Camacho-Rangel²,

Arce-Saldaña³

et al. 2019

revmexcg

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Vásquez Serrano et al. RMCG | v. 36 | núm. 1 | www.rmcg.unam.mx | DOI: http://dx.de fracturas geológicas en el pozo Agrícola Oriental 2C, Ciudad de México y su relación con fallas mayores: Revista Mexicana de Ciencias Geológicas, v. 36, núm. 1, p. 38-53. RESUMENEn años recientes, en la Ciudad de México se han realizado varios pozos exploratorios de hasta 2000 m de profundidad, con el fin de encontrar acuíferos que ayuden a disminuir el desabasto de agua potable para el área metropolitana. En particular, en el pozo Agrícola Oriental 2C, perforado en la Alcaldía de Iztacalco, se recuperaron varios núcleos, uno de los cuales mide 9 m, ubicado entre 1550 y 1559 m de profundidad, cercano al contacto entre rocas calcáreas del Cretácico y rocas volcánicas del Oligoceno, a ~1560 m de profundidad. El núcleo muestra que las rocas volcánicas se encuentran afectadas por una cantidad importante de fracturas, las cuales pueden ser divididas en dos familias con base en su relleno y relaciones de corte (F1 y F2). Las fracturas más jóvenes (F2) se relacionan con una falla, llamada informalmente en este trabajo falla Agrícola Oriental, que pone en contacto rocas sedimentarias y volcánicas.Palabras clave: fractura geológica; análisis fractal; arreglo de fracturas; intensidad de fracturas; falla Agrícola Oriental. ABSTRACTIn the last years several exploratory wells have been drilled in Mexico City down to 2000 m depth, with the aim to explore deep aquifers to cover the water deficiency in the metropolitan area. In particular, in the Agricola Oriental 2C well, located in the Iztacalco municipality, several cores were recovered; one of them is 9 m long, located between 1550 and 1559 m depth. This core is situated close to the contact between an Oligocene volcanic unit and a Cretaceous limestone at ~1560 m depth. The study core shows that the volcanic rocks are affected by an important number of fractures, which can be divided into two families according to their intersection relationships and fill material (F1 and F2). The younger fractures (F2) are related with a fault, informally named here as Agricola Oriental fault, which sets in tectonic contact the sedimentary and the volcanic rocks.The fractures were characterized through a detailed analysis of their number, geometry and spatial arrangement, using the scan line method and taking into account both families of fractures. These variables were expressed such as fracture intensity, box and correlation fractal dimensions, Lyapunov exponent, variation coefficient, and cumulative frequency exponent. Our results show that the spacing between fractures and the aperture follow a power law in a log-log graph of the cumulative frequency analysis that results in a fractal behavior. The pattern values showed in the fracture intensity, fractal dimension, Lyapunov exponent, and aperture cumulative frequency exponent progressively diminish as the distance to the fault increases. In turn, the coefficients of variation and spacing cumulative frequency exponent have a different pattern: Análisis de...

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Response of diatom assemblages to orbital‐ and millennial‐scale climatic variability since the penultimate glacial maximum in the northern limit of the Neotropics

Avendaño

Caballero-Miranda

Ortega‐Guerrero

et al. 2023

J Quaternary Science

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Lake Chalco, in Central Mexico, has a long diatom record which provides an excellent opportunity to document the biotic and hydrological responses of this ecosystem to orbital‐ and millennial‐scale climatic variability during the last 150 ka. Detrended correspondence analysis was used to evaluate the ecological turnover and to identify diatom species associations throughout the sequence. Millennial‐scale climatic fluctuations were identified as peaks in freshwater (mostly small Fragilariaceae spp.) or as peaks in salt‐tolerant species. At orbital scales, species turnover involved changes between freshwater assemblages dominated by Stephanodiscus spp. – small Fragilariaceae spp. – Cocconeis placentula, present during low‐evaporation, cool intervals [late Marine Isotope Stage (MIS)6, MIS5d, MIS2] against salt‐tolerant taxa, dominated by Stephanocyclus and Cyclotella spp., in higher evaporation, higher salinity conditions (MIS5e, MIS5c–a, MIS4, MIS3, early MIS1). Comparatively, MIS6 and MIS5d seem to have been cooler (~ −6 to −7 °C) and wetter than MIS2 (~ − 4 to −5 °C). In contrast, MIS5e and early MIS1 (11.5–6 ka) had similar warmer, low lake level, saline conditions. In addition, MIS5 was a period of intense climatic change associated with wide‐amplitude orbital forcing that favored a Stephanocyclus–Cyclotella spp. ecological succession (S. meneghinianus, C. tlalocii, C. poyeka, S. quillensis). In contrast, smaller temperature changes were inferred during MIS4 and MIS3.

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Perforación profunda en el lago de Chalco: reporte técnico

Abstract: ABSTRACT

Cited by 25 publications

References 9 publications

" Geoelectrical and Electromagnetic Methods Applied to Paleolimnological Studies: Two Examples from Desiccated Lakes in the Basin of Mexico"

" Geoelectrical and Electromagnetic Methods Applied to Paleolimnological Studies: Two Examples from Desiccated Lakes in the Basin of Mexico"

Análisis de fracturas geológicas en el pozo Agrícola Oriental 2C, Ciudad de México y su relación con fallas mayores

Response of diatom assemblages to orbital‐ and millennial‐scale climatic variability since the penultimate glacial maximum in the northern limit of the Neotropics

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