La zona de falla Tosco-Abreojos: un sistema lateral derecho activo entre la placa Pacífico y la península de Baja California

Michaud, François; Calmus, Thierry; Sosson, Marc; Royer, Jean‐Yves; Bourgois, Jacques; Chabert, Anne; Bigot-Cormier, Florence; Bandy, B.; Mortera-Gutiérrez, C. A.; Dyment, J.

doi:10.18268/bsgm2005v57n1a3

Cited by 12 publications

(3 citation statements)

References 25 publications

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“…However, along the western margin of the Baja California peninsula (Fig. 1), some active faults, such as the Tosco-Abreojos fault system in the southern part of the Baja California margin, still accommodate a small part of the motion (DEMETS, 1995;DEMETS and DIXON, 1999;DIXON et al, 2000;FLETCHER and MUNGUIA, 2000;MICHAUD et al, 2004;MICHAUD et al, 2005MICHAUD et al, , 2007. The relative displacement between the Pacific plate and Baja California Sur is consistent with a right lateral motion along the margin and with the focal mechanisms of earthquakes occurring in this region (Fig.…”

Section: Introductionsupporting

confidence: 54%

Active Deformation along the Southern End of the Tosco-Abreojos Fault System: New Insights from Multibeam Swath Bathymetry

Michaud

Calmus

Ratzov

et al. 2010

Pure Appl. Geophys.

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The relative motion of the Pacific plate with respect to the North America plate is partitioned between transcurrent faults located along the western margin of Baja California and transform faults and spreading ridges in the Gulf of California. However, the amount of right lateral offset along the Baja California western margin is still debated. We revisited multibeam swath bathymetry data along the southern end of the Tosco-Abreojos fault system. In this area the depths are less than 1,000 m and allow a finer gridding at 60 m cell spacing. This improved resolution unveils several transcurrent right lateral faults offsetting the seafloor and canyons, which can be used as markers to quantify local offsets. The seafloor of the southern end of the Tosco-Abreojos fault system (south of 24°N) displays NW-SE elongated bathymetric highs and lows, suggesting a transtensional tectonic regime associated with the formation of pull-apart basins. In such an active tectonic context, submarine canyon networks are unstable. Using the deformation rate inferred from kinematic predictions and pull-apart geometry, we suggest a minimum age for the reorganization of the canyon network.

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Section: Introductionsupporting

confidence: 54%

Active Deformation along the Southern End of the Tosco-Abreojos Fault System: New Insights from Multibeam Swath Bathymetry

Michaud

Calmus

Ratzov

et al. 2010

Pure Appl. Geophys.

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“…A su vez, el rifting evolucionó desde una extensión casi ortogonal hasta la extensión oblicua de dirección NE-SW que dio lugar al proto-golfo (Stock y Hodges, 1989). Entre el Mioceno Medio y el Plioceno Inferior (12 y 5.5 Ma), el movimiento entre las placas Pacífico y de Norteamérica se desarrolló esencialmente por medio del sistema de fallas transformantes de movimiento dextral de Tosco-Abreojos (Spencer y Normark, 1989;Michaud et al, 2005Michaud et al, , 2007. Posteriormente, desde 5 Ma, la EPR se propagó hacia el norte, adentrándose en el GC.…”

Section: Marco Geotectónicounclassified

Batimetría y características hidrográficas (Mayo, 2007) en las Cuencas de Consag y Wagner, Norte del Golfo de California, México

Vázquez-Figueroa¹,

Canet²,

Prol‐Ledesma³

et al. 2009

BSGM

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ResumenLa parte Norte del Golfo de California presenta una compleja actividad tectónica, además de ser una región sometida a diversos factores oceanográficos y climáticos que modifican constantemente la circulación y composición del agua y la dinámica de los sedimentos. Con el objeto de distinguir los principales rasgos hidrográficos para la columna de agua, así como su batimetría detallada, se analizaron datos de CTD y ecosonda tomados durante mayo de 2007 en las cuencas de Wagner y Consag. La batimetría de las cuencas sugiere una subsidencia ligada a extensión pull-apart. Los taludes que definen el borde oriental de las cuencas se corresponden con la falla lístrica de Wagner, con orientación NNW-SSE. Los resultados indicaron que la columna de agua se encontraba estratificada con una termoclina presente en los primeros 50 metros de profundidad y sólo el 32% de estaciones presentó una capa de mezcla. La temperatura de la columna varió entre 23° en la superficie hasta 15°C en el fondo de las cuencas. La salinidad osciló entre 35.2 en el fondo y 35.8 en la superficie, con ausencia de haloclina. Se identificó un domo de menor salinidad (35.32) que parece desplazarse de sur a norte, de 50 a 150 m de profundidad. El diagrama T-S muestra la presencia de Agua del Golfo de California.Palabras clave: Masas de agua, termoclina, batimetría, cuenca de pull-apart, Falla de Wagner. Abstract The northern Gulf of California encompasses a complex tectonic setting characterized by several oceanographic and climatic factors that continuously change water circulation and composition as well as sediment dynamics. CTD and echosounder data, collected during

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“…The subduction of the Farallon Plate ceased along Baja California simultaneously with the migration of the Rivera triple point southwards (Martín‐Barajas & Delgado‐Argote 1995). During that period (between 12 and 5.5 Ma), the triple point moved until the southernmost tip of the presently Baja California Peninsula, and the movement between the Pacific and North American Plates developed predominantly along the Tosco–Abreojos dextral transform fault system (Spencer & Normark 1989; Michaud et al . 2005, 2007).…”

Section: Geological Settingmentioning

confidence: 99%

Geology, ore deposits and hydrothermal venting in Bahía Concepción, Baja California Sur, Mexico

Camprubí¹,

Canet²,

Rodríguez-Díaz³

et al. 2007

Island Arc

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Bahía Concepción is located in the eastern coast of the Baja California peninsula and it is shaped by northwestern-southeastern normal faults. These are associated with a 12-6 Ma rifting episode, although some have been reactivated since the Pliocene. The most abundant rocks correspond to the arc related Comondú Group, Oligocene to Miocene, which forms a mainly calc-alkaline volcanic and volcaniclastic sequence. There are less extensive outcrops of sedimentary rocks, lava flows, domes and pyroclastic rocks of Pliocene to Quaternary ages. The Neogene volcanism in the area indicates a shift from a subduction regime to an intraplate volcanism related to continental extension and the opening of an oceanic basin. The Bahía Concepción area contains numerous Mn ore deposits, being the biggest at El Gavilán and Guadalupe. The Mn deposits occur as veins, breccias and stockworks, and are composed by Mn oxides (pyrolusite, coronadite, romanechite), dolomite, quartz and barite. The deposits are hosted in volcanic rocks of the Comondú Group and, locally, in Pliocene sedimentary rocks. Thus, the Mn deposits formed between the Middle Miocene and the Pliocene. The mineralized structures are associated with Miocene northwestern-southeastern fault systems, which are analogous to those associated with the Cu-Co-Zn-Mn deposits of El Boleo. The Bahía Concepción area also bears subaerial and submarine hot springs, which are associated with the same fault systems and host rocks. The submarine and subaerial geothermal manifestations south of the bay are possibly related with recent volcanism. The geothermal manifestations within the bay are intertidal hot springs and shallow submarine diffuse venting areas. Around the submarine vents (5-15 m deep, 87°C), Fe-oxyhydroxide crusts with pyrite and cinnabar precipitate. In the intertidal vents (62°C), aggregates of opal, calcite, barite and Ba-rich Mn oxides occur covered by silica-carbonate stromatolitic sinters. Some 10-30 cm thick crustiform veins formed by chalcedony, calcite and barite are also found close to the vents. The hydrothermal fluids exhibit mixed isotopic compositions between d 18 O-enriched meteoric and local marine water. The precipitation of Ba-rich Mn oxides around the vent sites could be an active analog for the processes that produced Miocene to Pliocene hydrothermal Mn-deposits.

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La zona de falla Tosco-Abreojos: un sistema lateral derecho activo entre la placa Pacífico y la península de Baja California

Cited by 12 publications

References 25 publications

Active Deformation along the Southern End of the Tosco-Abreojos Fault System: New Insights from Multibeam Swath Bathymetry

Active Deformation along the Southern End of the Tosco-Abreojos Fault System: New Insights from Multibeam Swath Bathymetry

Batimetría y características hidrográficas (Mayo, 2007) en las Cuencas de Consag y Wagner, Norte del Golfo de California, México

Geology, ore deposits and hydrothermal venting in Bahía Concepción, Baja California Sur, Mexico

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