A5030081274- Geomagnetism and Paleomagnetism Studies
- Geological and Geochemical Analysis
- Geology and Paleoclimatology Research
- Geophysical and Geoelectrical Methods
- Geochemistry and Geologic Mapping
- Geological and Tectonic Studies in Latin America
- earthquake and tectonic studies
- Environmental Toxicology and Ecotoxicology
- Environmental Chemistry and Analysis
- Pesticide and Herbicide Environmental Studies
- Archaeological and Geological Studies
- Geological and Geophysical Studies
- Hydraulic Fracturing and Reservoir Analysis
- Paleontology and Evolutionary Biology
- Paleontology and Stratigraphy of Fossils
- Earthquake Detection and Analysis
- Plant and soil sciences
- Pleistocene-Era Hominins and Archaeology
- High-pressure geophysics and materials
- Reservoir Engineering and Simulation Methods
- Archaeology and Cultural Heritage
- Mining Techniques and Economics
- Geotechnical and Geomechanical Engineering
- Malaria Research and Control
- Landslides and related hazards
Universidad Nacional Autónoma de México
2009-2022
Red de Investigación Cardiovascular
2019
Universidad Michoacana de San Nicolás de Hidalgo
2019
Centro Científico Tecnológico - San Luis
2019
California State University, Fresno
2011
Halliburton (United Kingdom)
2009
Federico Villarreal National University
1999-2002
Instituto de Geofísica y Astronomía
1997
A recent (2000 BP) lava flow from central Mexico has been sampled along a vertical profile with 55 cores covering total thickness of 6.6 m. wide range physical and magnetic parameters have studied to characterise the samples: Curie temperature saturation magnetisation as intrinsic properties; density, susceptibility remanence intensity bulk Königsberger Q-factor hysteresis coercivity parameters. All vary smoothly over profile, most probably due grain size variation minerals present in...
This paper presents a short description of the coring operations undertaken to recover full lacustrine sedimentary sequence from Chalco.Geophysical techniques were used determine distribution and thickness sediments in order select drilling site.Resonance frequencies determined H/V spectral ratios an area where lake reached 300 m thickness.Electromagnetic survey showed two changes electric resistivity which related sediment composition, first 100 120 m, increase volcanoclastic second 330 400...
En este trabajo se reportan resultados de un estudio combinado K-Ar y paleomagnetismo rocas volcánicas la Sierra Las Cruces, Cuenca México. La está constituida predominante por dacíticas, flujos piroclásticos lahares. Constituye el límite oeste presenta una orientación NNW-SSE. Este preliminar fue diseñado para investigar estratigrafía volcánica documentar cuantitativamente aparente migración espacio-temporal actividad volcánica. El muestreo realizado a lo largo transecto siguiendo tendencia...
Abstract Results of an archaeomagnetic study two excavation field seasons at the Xalla and Teopancazco residential areas ancient Prehispanic city Teotihuacan, Central Mexico are reported. One-hundred fifty three oriented samples lime-plasters from archaeological sites were collected for study. NRM directions reasonably well grouped. Alternating demagnetization shows single or two-component magnetizations. Rock magnetic measurements point to fine-grained titanomagnetites with pseudo-single...
The Pacific coast of Mexico has repeatedly been exposed to destructive tsunamis. Recent studies have shown that rock magnetic methods can be a promising approach for identification tsunami- or storm-induced deposits. We present new and anisotropy susceptibility (AMS) results in order distinguish tsunami deposits the Ixtapa–Zihuatanejo area. sampled, 80 cm-deep sequence is characterized by presence two anomalous sand beds within fine-grained coastal lower bed probably associated with 14 March...
Rock-magnetic and microscopic studies of the iron ores associated igneous rocks in Cerro de Mercado, Mexico, were carried out to determine magnetic mineralogy origin natural remanent magnetization (NRM), related thermo-chemical processes due hydrothermalism. Chemical (CRM) seems be present most investigated ore wall rock samples, replacing completely or partially an original thermoremanent (TRM). Magnetite (or Ti-poor titanomagnetite) hematite are commonly found ores. Although may carry a...
Geomagnetic reversals are global phenomena, for about 50 years the paleomagnetists attempted to acquire as many detailed records possible using magnetic memory of sediments and lava flows. Yet, transitional field behavior remains poorly characterized largely because sporadic aspect volcanic eruptions. In some specific cases, paleosols such those developed from alluvial or aeolian sediments, may also record variations Field across polarity changes. Here, we report a paleomagnetic...
Este estudio presenta los resultados paleomagnéticos del Volcán Tancitaro, (perteneciente al Campo Volcánico Michoacán Guanajuato), en el oeste de México, como una contribución a la base datos promediados tiempo campo global. Se realizó paleomagnético y magnetismo roca once flujos lava. colectaron 120 núcleos orientados volcán Tancitaro sus áreas aledañas. Todos sitios fueron previamente fechados por 40Ar -39Ar (Ownby et al., 2007,) van desde 793 ka hasta presente. realizaron experimentos...
Presentamos un estudio paleomagnético, de magnetismo rocas geocronológico y paleointensidad conjunto, en volcánicas Miocénicas del sector la Faja Volcánica Transmexicana (FVTM). En el cual se emplearon 58 sitios compuestos por 7 a 21 unidades enfriamiento consecutivas 4 secciones estratigráficas separadas. Nuestros nuevos fechamientos radiométricos sugieren que los flujos lava secuencia Jesús Maria fueron emitidos durante corto lapso 11.1±0.8 10±0.8 Ma cron polaridad normal C5n.2n. La...
La evaluacion de riesgos ambientales por productos fitosanitarios es un componente importancia en los estudios impacto ambiental el sector agricola. Se evaluo la ecotoxicidad plaguicidas suelo, lindano y clorpirifos, sobre mortalidad del oligoqueto Limnodrilus hoffmeisteri (CL50 24h) tres plantas, las cuales se observaron siguientes efectos subletales: germinacion Lactuca sativa (CI90 96h), crecimiento raiz Lycopersicon esculentum (CI50 96h) clorosis, necrosis, ruptura formacion hojas nuevas...
Abstract Anisotropy of magnetic susceptibility (AMS) was selected as the key technique to find source widespread Cantera Ignimbrite and seek its possible relationship with San Luis Potosí Caldera. Eighteen sites (372 specimens from 155 cores) Oligocene were sampled. AMS measured on a KLY2 Kappabridge. data processed Anisoft 3 software using Jelinek statistics well ‘SpheriStat’ principal components density distribution. Mean susceptibilities range 290 5026 × 10 -6 SI (average = 2526 SI). The...
The Xitle volcano is part of the Quaternary Chichinautzin volcanic field, located in southern portion Valley Mexico.The lavas were emplaced on archaeological site Cuicuilco, one first urban settlements Preclassic period Mexico.This eruption had a great impact, since it caused economic and social changes, favoring consolidation Teotihuacan as dominant city Mexico.Available radiometric studies place age between 4000 to 1500 years BP (before present) there evidence that Cuicuilco abandonment...
Iron oxides can be produced in soils due to chemical weathering/pedogenesis and are related climatic conditions also anthropogenic alterations. In this research, four soil profiles (TAC1, TAC2, TAC3 LV1) were analyzed areas with different two lake basins of volcanic environments: the Alberca de Tacámbaro (TAC) state Michoacán, a warm-subhumid climate Lago Verde (LV) Veracruz warm-humid climate. The objective study was generate preliminary information on transformation landscape basins,...
Se realizo una evaluacion ecotoxicologica estandarizada de plaguicidas del suelo: lindano, clorpirifos y metamidofos, en la Universidad Federico Villarreal, Lima, Peru, empleando al caracol dulceacuicola Physa venustula como herramienta para riesgos ambientales. Los valores determinados concentracion letal media (CL50) el efecto los evaluados fueron a 24, 48 96 h exposicion respectivamente: lindano 811,89; 715,30 415 m g L-1; 379,13; 154,18 66,01 L-1 metamidofos 1 791, 391,33 194 L-1....
Resultados paleomagnéticos nuevos del Cañón de Río Grande Santiago (RGS), correspondientes a 13 sitios en unidadesvolcánicas las secciones Huaxtla, Paso Guadalupe y Lazo, así como 5 la Sierra Primavera, se utilizan conel fin documentar magnetoestratigrafía preliminar secuencias volcánicas Cinturón Volcánico Transmexicano(TMVB). Los resultados magnetoestratigráficos correlacionan con datos 7 cercanos RGS, 6 SP ycon fechamientos K-Ar disponibles. Un pozo geotérmico exploratorio Comisión...