Experienced geophysicist with academic carrer and ample and succesfull participation in natural resources and geologic hazards prospecting projects. Address: Queretaro, Mex.
The composition of the volcanic rocks in the Jalisco Block (JB), particularly those from the Coli... more The composition of the volcanic rocks in the Jalisco Block (JB), particularly those from the Colima rift and Los Volcanes and Mascota regions, are quite similar and show an anomalous enrichment in incompatible elements (e.g., K). Luhr et al. (1989) proposed that the alkaline and calc-alkaline lavas from those areas originated in a common source, which consisted of mantle overlying
En publicaciones previas hemos reportado que el Valle de Banderas, continuación en tierra de la B... more En publicaciones previas hemos reportado que el Valle de Banderas, continuación en tierra de la Bahía de Banderas, entre Jalisco y Nayarit, tiene una estructura de graben, con el flanco este más caído que el flanco oeste. También hemos propuesto que este graben forma parte del límite NW del Bloque de Jalisco, junto con otros grábenes que siguiendo una dirección NE se extienden desde el graben Tepic-Zacoalco hasta la Bahía de Banderas. Asimismo hemos anotado que el eje del graben del Valle de Banderas está desviado alrededor de 30° respecto al Cañón de Banderas, observación que hasta ahora no ha sido explicada. Aquí discutimos la respuesta de un transecto magnetotelúrico (MT) que inicia en Cabo Corrientes, continúa en las Islas Marietas, y recorre la costa Nayarita desde Punta Mita hasta la Bahía de Matachén, en donde se interna con rumbo norte hasta las estribaciones de la Sierra Madre Occidental. La sección MT presenta dos claras discontinuidades que delimitan una región que va des...
Exploraciones sísmicas en la boca y el interior del Golfo de California en dirección NW-SE, hecha... more Exploraciones sísmicas en la boca y el interior del Golfo de California en dirección NW-SE, hechas por otros grupos, determinaron la existencia de un proceso de adelgazamiento de la corteza entre la península y la parte NW del Bloque de Jalisco. Este efecto cortical es atribuido al proceso de extensión provocado por su separación, iniciada a fines del Mioceno Medio. Este mismo proceso tectónico debió afectar a la placa en subducción en esa zona. Sin embargo, en esos estudios no se reportó ninguna información sobre las características de la placa marina en la zona. No obstante, una línea sísmica adicional en la vecindad del término de la trinchera Mesoamericana, obtenida por el mismo grupo que realizó los levantamientos arriba mencionados, en la plataforma marina entre las Islas Marías y Bahía de Banderas, iniciando al sur de las Islas Marías casi en dirección W-E hacia la costa de Nayarit, sí perfiló la posición de la placa marina en esa región; esos datos nos fueron proporcionados ...
Several, concurring tectonic processes took place when Baja California began its separation from ... more Several, concurring tectonic processes took place when Baja California began its separation from the North American plate. One of them, which has not been explored in detail, corresponds to the breaking up of the, at that time, subducting Magdalena oceanic plate. Seismic studies in the mouth of the Gulf of California recently established that widespread crustal extension occurred at the various separation stages of the peninsula. The subducting oceanic plate must have been affected by extensional phenomena as well. Those studies, however, did not evaluate the corresponding changes induced in the subducting oceanic slab by the extension process. Other seismic studies previously mapped the shape of the subducting slab along various profiles perpendicular to the Middle America Trench (MAT) encompassing the Rivera and Cocos plates. They showed that in the Rivera plate section the subduction angle is steeper than along various Cocos plate sections. They also inferred the position of the ...
Land subsidence and soil fissuring are phenomena connected to groundwater extraction in sedimenta... more Land subsidence and soil fissuring are phenomena connected to groundwater extraction in sedimentary basins. The rapid depletion of the aquifers induces ground compaction and differential settlements. The stress increment within the drained sediments triggers the consolidation phenomenon in the compressible soil layers. If the rock basement is irregular, not only vertical but also horizontal displacements are induced and therefore tension
... The late Miocene circumgulf extension was linked to the Basin and Range extensional province ... more ... The late Miocene circumgulf extension was linked to the Basin and Range extensional province by Stock and Hodges (1989); they also suggested that such an extensional province ends at a line that extends from BB to the Mexican Neovolcanic Axis. ...
Journal of Volcanology and Geothermal Research, 2008
Joya Honda (JH) is a Quaternary maar excavated in Mesozoic limestone. It is located in central Me... more Joya Honda (JH) is a Quaternary maar excavated in Mesozoic limestone. It is located in central Mexico and belongs to the Ventura volcanic field (VVF), which is composed by cinder cones and maars made of intraplate-type mafic alkalic rocks. Volcanoes in the region form ...
... Ana Ruiz-Constán 1 ,* , Jesús Galindo-Zaldivar 1 ,2 , Antonio Pedrera 3 , Jorge A ... subduct... more ... Ana Ruiz-Constán 1 ,* , Jesús Galindo-Zaldivar 1 ,2 , Antonio Pedrera 3 , Jorge A ... subduction associated with slab rollback and/or detachment of the slab (Blanco and Spakman ... the GSA Data Repository 1 ) is represented by the direction of maximum conductivity (geoelectrical ...
ABSTRACT Mélange rocks outcrop widely in the central and western frontal sectors of the Betic Cor... more ABSTRACT Mélange rocks outcrop widely in the central and western frontal sectors of the Betic Cordillera, as in many other collisional orogens where they form part of the accretionary wedges. Extrusion of Triassic plastic clays and evaporites was favored by the progressive accretion of the Betic External Zones, mixing rocks of different provenance and forming a synorogenic frontal mélange unit. MT data coupled with gravity data are a valid combined methodology to characterize the geometry of these mélange units, since the characterization of plastic rocks geometry is usually uncertain using seismic techniques. The results correlate well with known geological features (sedimentary basins, calcareous ranges, evaporitic rocks) and reveal the deep geometry. A resistive body, slightly dipping toward the SE, points to the continuity of the Iberian Massif below the Guadalquivir basin (2�) and the External Zones (6–8�). To the south, gravity models show the Iberian continental crust subducting below the Internal Zones with a roughly 20–35� slope. The main conductive bodies are related to the location of evaporitic rocks involved in the frontal mélange. They overlie the Iberian Massif and, southwards, the frontal Jurassic and Cretaceous limestone sequences of the External and Median Subbetics. In this setting, thick plastic rock units placed above the foreland could act as a lubricant facilitating continental subduction, and being progressively accreted toward a frontal mélange.
... Although there may be also other causes, such as desiccation or tectonically induced fissures... more ... Although there may be also other causes, such as desiccation or tectonically induced fissures, there is a widespread association of ground failure with water declines (Burbey, 2002, Rojas et al., 2002, Garduño-Monroy et al., 2001, Bell and Helm, 1998, Rothenburg et al., 1995 ...
A gravimetric survey consisting of five lines and 483 stations, as well as a magnetotelluric (MT)... more A gravimetric survey consisting of five lines and 483 stations, as well as a magnetotelluric (MT) survey consisting ofl 7 observation sites, were made in the Valle de Banderas region for the determination of the structural characteristics of the valley. Additionally, data from a ...
Two magnetotelluric profiles perpendicular to the trench provide information on the subduction of... more Two magnetotelluric profiles perpendicular to the trench provide information on the subduction of the Rivera plate under the Jalisco Block (JB). The geometry of the subducting slab is inferred by the anomalous conductor on the top of the profile in the central part of the JB. Highconductivity zones (< 50 ohmm) at depths shallower than 10 km are associated to dewatering of the oceanic crust below the accretion prism in the SW portion of the profile. Away from the coast, observed upper crustal conductors (< 10 km) are interpreted as partial melt related to the Central Jalisco Volcanic Lineament. The source of the crustal conductor in the central part of the MT profile, ~150 km inland and down to depths of 40 km is interpreted as a region of interconnected fluids associated with the metamorphic dehydration of the oceanic plate. Contrasting resistivity at the mantle wedge at depths below 40 km suggest to us that hot mantle material may be migrating upwards, mixing with dehydration...
En este trabajo se reportan los resultados de 16 mediciones de gravedad absoluta (GA) utilizando ... more En este trabajo se reportan los resultados de 16 mediciones de gravedad absoluta (GA) utilizando dos gravímetros de caída libre, el FG5X-220 de la Universidad Leibniz de Hannover (LUH) y el FG5X-252 del Centro Nacional de Metrología (CENAM). Previo al establecimiento de nuevas estaciones gravimétricas de primer orden y a las campañas de adquisición en el Bloque de Jalisco (BJ), se llevó a cabo la certificación del gravímetro FG5X-252 a partir de dos comparaciones instrumentales; la primera con el FG5X-220 de LUH, el cual es un instrumento certificado de larga estabilidad y repetibilidad debajo de los 2 µGal, y la segunda a través de una comparación internacional con otros 13 instrumentos en las instalaciones de la NOAA en Table Mountain, Colorado, USA. Las campañas de medición en el BJ se realizaron durante la estación seca (Feb/Mar) los años 2016 y 2018, e incluyó las estaciones de Chamela (CHA), Guadalajara (UGG), Manzanillo (MAN), Puerto Vallarta (UGP) y Tepic (TEP), ésta última ...
The composition of the volcanic rocks in the Jalisco Block (JB), particularly those from the Coli... more The composition of the volcanic rocks in the Jalisco Block (JB), particularly those from the Colima rift and Los Volcanes and Mascota regions, are quite similar and show an anomalous enrichment in incompatible elements (e.g., K). Luhr et al. (1989) proposed that the alkaline and calc-alkaline lavas from those areas originated in a common source, which consisted of mantle overlying
En publicaciones previas hemos reportado que el Valle de Banderas, continuación en tierra de la B... more En publicaciones previas hemos reportado que el Valle de Banderas, continuación en tierra de la Bahía de Banderas, entre Jalisco y Nayarit, tiene una estructura de graben, con el flanco este más caído que el flanco oeste. También hemos propuesto que este graben forma parte del límite NW del Bloque de Jalisco, junto con otros grábenes que siguiendo una dirección NE se extienden desde el graben Tepic-Zacoalco hasta la Bahía de Banderas. Asimismo hemos anotado que el eje del graben del Valle de Banderas está desviado alrededor de 30° respecto al Cañón de Banderas, observación que hasta ahora no ha sido explicada. Aquí discutimos la respuesta de un transecto magnetotelúrico (MT) que inicia en Cabo Corrientes, continúa en las Islas Marietas, y recorre la costa Nayarita desde Punta Mita hasta la Bahía de Matachén, en donde se interna con rumbo norte hasta las estribaciones de la Sierra Madre Occidental. La sección MT presenta dos claras discontinuidades que delimitan una región que va des...
Exploraciones sísmicas en la boca y el interior del Golfo de California en dirección NW-SE, hecha... more Exploraciones sísmicas en la boca y el interior del Golfo de California en dirección NW-SE, hechas por otros grupos, determinaron la existencia de un proceso de adelgazamiento de la corteza entre la península y la parte NW del Bloque de Jalisco. Este efecto cortical es atribuido al proceso de extensión provocado por su separación, iniciada a fines del Mioceno Medio. Este mismo proceso tectónico debió afectar a la placa en subducción en esa zona. Sin embargo, en esos estudios no se reportó ninguna información sobre las características de la placa marina en la zona. No obstante, una línea sísmica adicional en la vecindad del término de la trinchera Mesoamericana, obtenida por el mismo grupo que realizó los levantamientos arriba mencionados, en la plataforma marina entre las Islas Marías y Bahía de Banderas, iniciando al sur de las Islas Marías casi en dirección W-E hacia la costa de Nayarit, sí perfiló la posición de la placa marina en esa región; esos datos nos fueron proporcionados ...
Several, concurring tectonic processes took place when Baja California began its separation from ... more Several, concurring tectonic processes took place when Baja California began its separation from the North American plate. One of them, which has not been explored in detail, corresponds to the breaking up of the, at that time, subducting Magdalena oceanic plate. Seismic studies in the mouth of the Gulf of California recently established that widespread crustal extension occurred at the various separation stages of the peninsula. The subducting oceanic plate must have been affected by extensional phenomena as well. Those studies, however, did not evaluate the corresponding changes induced in the subducting oceanic slab by the extension process. Other seismic studies previously mapped the shape of the subducting slab along various profiles perpendicular to the Middle America Trench (MAT) encompassing the Rivera and Cocos plates. They showed that in the Rivera plate section the subduction angle is steeper than along various Cocos plate sections. They also inferred the position of the ...
Land subsidence and soil fissuring are phenomena connected to groundwater extraction in sedimenta... more Land subsidence and soil fissuring are phenomena connected to groundwater extraction in sedimentary basins. The rapid depletion of the aquifers induces ground compaction and differential settlements. The stress increment within the drained sediments triggers the consolidation phenomenon in the compressible soil layers. If the rock basement is irregular, not only vertical but also horizontal displacements are induced and therefore tension
... The late Miocene circumgulf extension was linked to the Basin and Range extensional province ... more ... The late Miocene circumgulf extension was linked to the Basin and Range extensional province by Stock and Hodges (1989); they also suggested that such an extensional province ends at a line that extends from BB to the Mexican Neovolcanic Axis. ...
Journal of Volcanology and Geothermal Research, 2008
Joya Honda (JH) is a Quaternary maar excavated in Mesozoic limestone. It is located in central Me... more Joya Honda (JH) is a Quaternary maar excavated in Mesozoic limestone. It is located in central Mexico and belongs to the Ventura volcanic field (VVF), which is composed by cinder cones and maars made of intraplate-type mafic alkalic rocks. Volcanoes in the region form ...
... Ana Ruiz-Constán 1 ,* , Jesús Galindo-Zaldivar 1 ,2 , Antonio Pedrera 3 , Jorge A ... subduct... more ... Ana Ruiz-Constán 1 ,* , Jesús Galindo-Zaldivar 1 ,2 , Antonio Pedrera 3 , Jorge A ... subduction associated with slab rollback and/or detachment of the slab (Blanco and Spakman ... the GSA Data Repository 1 ) is represented by the direction of maximum conductivity (geoelectrical ...
ABSTRACT Mélange rocks outcrop widely in the central and western frontal sectors of the Betic Cor... more ABSTRACT Mélange rocks outcrop widely in the central and western frontal sectors of the Betic Cordillera, as in many other collisional orogens where they form part of the accretionary wedges. Extrusion of Triassic plastic clays and evaporites was favored by the progressive accretion of the Betic External Zones, mixing rocks of different provenance and forming a synorogenic frontal mélange unit. MT data coupled with gravity data are a valid combined methodology to characterize the geometry of these mélange units, since the characterization of plastic rocks geometry is usually uncertain using seismic techniques. The results correlate well with known geological features (sedimentary basins, calcareous ranges, evaporitic rocks) and reveal the deep geometry. A resistive body, slightly dipping toward the SE, points to the continuity of the Iberian Massif below the Guadalquivir basin (2�) and the External Zones (6–8�). To the south, gravity models show the Iberian continental crust subducting below the Internal Zones with a roughly 20–35� slope. The main conductive bodies are related to the location of evaporitic rocks involved in the frontal mélange. They overlie the Iberian Massif and, southwards, the frontal Jurassic and Cretaceous limestone sequences of the External and Median Subbetics. In this setting, thick plastic rock units placed above the foreland could act as a lubricant facilitating continental subduction, and being progressively accreted toward a frontal mélange.
... Although there may be also other causes, such as desiccation or tectonically induced fissures... more ... Although there may be also other causes, such as desiccation or tectonically induced fissures, there is a widespread association of ground failure with water declines (Burbey, 2002, Rojas et al., 2002, Garduño-Monroy et al., 2001, Bell and Helm, 1998, Rothenburg et al., 1995 ...
A gravimetric survey consisting of five lines and 483 stations, as well as a magnetotelluric (MT)... more A gravimetric survey consisting of five lines and 483 stations, as well as a magnetotelluric (MT) survey consisting ofl 7 observation sites, were made in the Valle de Banderas region for the determination of the structural characteristics of the valley. Additionally, data from a ...
Two magnetotelluric profiles perpendicular to the trench provide information on the subduction of... more Two magnetotelluric profiles perpendicular to the trench provide information on the subduction of the Rivera plate under the Jalisco Block (JB). The geometry of the subducting slab is inferred by the anomalous conductor on the top of the profile in the central part of the JB. Highconductivity zones (< 50 ohmm) at depths shallower than 10 km are associated to dewatering of the oceanic crust below the accretion prism in the SW portion of the profile. Away from the coast, observed upper crustal conductors (< 10 km) are interpreted as partial melt related to the Central Jalisco Volcanic Lineament. The source of the crustal conductor in the central part of the MT profile, ~150 km inland and down to depths of 40 km is interpreted as a region of interconnected fluids associated with the metamorphic dehydration of the oceanic plate. Contrasting resistivity at the mantle wedge at depths below 40 km suggest to us that hot mantle material may be migrating upwards, mixing with dehydration...
En este trabajo se reportan los resultados de 16 mediciones de gravedad absoluta (GA) utilizando ... more En este trabajo se reportan los resultados de 16 mediciones de gravedad absoluta (GA) utilizando dos gravímetros de caída libre, el FG5X-220 de la Universidad Leibniz de Hannover (LUH) y el FG5X-252 del Centro Nacional de Metrología (CENAM). Previo al establecimiento de nuevas estaciones gravimétricas de primer orden y a las campañas de adquisición en el Bloque de Jalisco (BJ), se llevó a cabo la certificación del gravímetro FG5X-252 a partir de dos comparaciones instrumentales; la primera con el FG5X-220 de LUH, el cual es un instrumento certificado de larga estabilidad y repetibilidad debajo de los 2 µGal, y la segunda a través de una comparación internacional con otros 13 instrumentos en las instalaciones de la NOAA en Table Mountain, Colorado, USA. Las campañas de medición en el BJ se realizaron durante la estación seca (Feb/Mar) los años 2016 y 2018, e incluyó las estaciones de Chamela (CHA), Guadalajara (UGG), Manzanillo (MAN), Puerto Vallarta (UGP) y Tepic (TEP), ésta última ...
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