Morphotectonics of the Pacific convergent margin of Costa Rica

Huene, Roland von; Bialas, J.; Flueh, Ernst R.; Cropp, B.; Csernok, Tiberiu; Fabel, E.; Hoffmann, Jasper; Emeis, Kay–Christian; Höller, Peter; Jeschke, G.; Fernandéz, I. Peréz; León, Rafael Torres de

doi:10.1130/spe295-p291

Cited by 83 publications

(45 citation statements)

References 20 publications

(49 reference statements)

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“…F5). The extensive multibeam bathymetric mapping shows variable seafloor morphology between the Nicoya and Osa Peninsulas (von Huene et al, 1995). The multibeam bathymetry is complemented by several deep-towed instrument traverses.…”

Section: Site Survey Datamentioning

confidence: 99%

“…The Cocos Ridge is an overthickened welt of oceanic crust that stands ~2.5 km higher than the surrounding seafloor and has a maximum thickness of ~25 km, which is greater than three times normal ocean crust thickness (Walther, 2003). Northwest of the Cocos Ridge, seamounts 1-2 km high and 10-20 km in diameter cover ~40% of the seafloor (von Huene et al, 1995. The subduction of the Cocos Ridge and seamounts has caused substantial subduction erosion of the outer forearc .…”

Section: The Cocos Ridge and Subducting Cocos Platementioning

confidence: 99%

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Expedition 344 summary

Li¹,

Malinverno²,

Torres³

et al. 2013

Proceedings of the IODP

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Expedition 344 summaryProc. IODP | Volume 344 2 from velocity-strengthening to velocity-weakening friction, and shear becomes localized. The onset of seismogenic behavior is correlated with the intersection of the 100°-150°C isotherm and the subduction thrust (Hyndman et al., 1997;Oleskevich et al., 1999). With increasing depth down the subduction thrust, the frictional characteristics undergo a second transition either due to the juxtaposition with the forearc mantle or because the rocks are heated to 350°-450°C and can no longer store elastic stresses needed for rupture. Transitional regions between the three zones have conditional stability and can host rupture but are generally not thought to be regions where large earthquakes initiate.Although this three-zone two-dimensional view of the subduction thrust provides a reasonable framework, it is simplistic. Rupture models for large subduction earthquakes suggest significant fault plane heterogeneity in slip and moment release that in three dimensions is characterized as patchiness (Bilek and Lay, 2002). Additionally, we now know the transition zone from stable to unstable sliding is not simple but hosts a range of fault behaviors that includes creep events, strain transients, slow and silent earthquakes, and low-frequency earthquakes (Peng and Gomberg, 2010;Beroza and Ide, 2011;Ide, 2012).Fundamentally unknown are the processes that change fault behavior from stable sliding to stick-slip behavior. Understanding these processes is important for understanding earthquakes, the mechanics of slip, and rupture dynamics. For a fault to undergo unstable slip, fault rocks must have the ability to store elastic strain, be velocity weakening, and have sufficient stiffness. Hypotheses for mechanisms leading to the transition between stable and unstable slip invoke temperature, pressure, and strain-activated processes that lead to downdip changes in the mechanical properties of rocks. These transitions are also sensitive to fault zone composition, lithology, fabric, and fluid pressures.The composition of the material in the fault zone and its contrast with the surrounding wall rock play a key role in rock frictional behavior. The frictional state of the incoming sediment changes progressively with increasing temperature and pressure as it travels downdip. Important lithologic factors influencing friction are composition, fabric, texture, and cementation of rocks, as well as fluid pore pressure (Bernabé et al., 1992;Moore and Saffer, 2001;Beeler, 2007;Marone and Saffer, 2007;Collettini et al., 2009). For example, fault rocks with high phyllosilicate content are generally weaker than rocks with low phyllosilicate content (Ikari et al., 2011). Sediment properties including porosity, permeability, consolidation state, and alteration history also exert a strong influence on fault zone behavior. At erosive margins, where the plate boundary cuts into the overriding plate, the composition and strength of the upper plate is also important (McCaffrey, 1993).Field observations and la...

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Section: Site Survey Datamentioning

confidence: 99%

Section: The Cocos Ridge and Subducting Cocos Platementioning

confidence: 99%

Expedition 344 summary

Li¹,

Malinverno²,

Torres³

et al. 2013

Proceedings of the IODP

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“…1;von Huene et al 1995Barckhausen et al, 2001). Bajo la costa SW de la península de Nicoya se subduce el primer precursor de la corteza oceánica formada en la dorsal entre las placas Coco y Nazca, denominada CNS-1 y que tiene una edad entre 22,5 y 22,0 Ma (Barckhausen et al, 2001).…”

Section: Marco Tectónicounclassified

“…Las flechas con los valores de 9 cm/año y de 8 mm/año muestran respectivamente, las velocidades del vector de movimiento relativo entre las placas Coco-Caribe y la del bloque del Antearco Centroamericano, que es paralelo a la fosa Mesoamericana. El modelo de sombras se hizo con base en datos SRTM (USGS, 2004) y el modelo batimétrico con la base de datos del Marine Geoscience Data System de Lamont-Doherty Earth Observatory de la Universidad de Columbia y von Huene et al (1995). km al NW hasta más de 20 km de espesor bajo la cordillera submarina del Coco (Walther, 2003), por lo que al ser subducida origina un proceso tipo colisión con el S de Costa Rica (Montero, 1994;Kolarsky et al, 1995;LaFemina et al, 2009). El límite entre el segmento suave y el dominado por montes submarinos es la serranía de Fisher y el monte de Fisher (Fig.…”

Section: Marco Tectónicounclassified

“…Wells et al (1988), Gardner et al (1992Gardner et al ( , 2001), Fisher et al (1994Fisher et al ( , 1998, Kolarsky et al (1995), von Huene et al (1995), y MacMillan et al (2004), entre otros, estudiaron los efectos tectónicos causados por la subducción de diversas batimetrías submarinas en el antearco costarricense. Al SW de la península de Nicoya destacan la formación de surcos profundos y protuberancias dómicas en el piso submarino von Huene et al, 1995). Asimismo, la rotación alrededor de un eje vertical del S de la península de Nicoya, ha sido asociado con la subducción de montañas submarinas o con la decapitación de las mismas durante la subducción (Gardner et al, 2001).…”

Section: Marco Tectónicounclassified

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Fallamiento neotectónico de la península de Nicoya y su relación con el escape tectónico del antearco centroamericano

Montero

Denyer

2011

Rev. Geol. Amér. Central

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A neotectonic array of faults has been determined in the Nicoya peninsula. In the central and NW sectors of the peninsula, blocks restricted by N-S trending dextral slip faults predominates. ENE sinistral slip faults and E-W oblique sinistral-reverse and NW pure reverse faults are confined to the dextral fault blocks. The previous spatial relationships between the different faults are explained by the north translation of this sector of the peninsula and the transrotation occurring inside the blocks. Sinistral and dextral slip faults with apparent similar relevance, and subordinate reverse faults have been mapped in the southern Nicoya peninsula. N and less probably E translational movements are inferred in this sector. The neotectonic faulting of the Nicoya peninsula is associated with the Cocos Ridge collision with the central and southern Costa Rica convergent margin, causing the tectonic escape to the NW of the Central American forearc sliver, parallel to the Middle America trench. Key words: Neotectonics, morphotectonics, seismotectonics, Nicoya, Costa Rica. RESUMEN:Se ha determinado un arreglo de fallas neotectónicas dentro de la península de Nicoya. En la parte central y NW de la península predominan bloques limitados por fallas de desplazamiento de rumbo dextral con rumbo N-S, dentro de los cuales se reconocen fallas sinestrales de rumbo ENE, oblicuas sinestrales-inversas con rumbo E-W e inversas de rumbo NW. Las anteriores relaciones espaciales entre los diversos tipos de fallas se explican por traslación al N de este sector de la península y la transrotación que ocurre dentro de los bloques. Las fallas cartografiadas en la zona S de la península se han interpretado como sinestrales y dextrales con una relevancia aparentemente similar, además se han definido fallas inversas subordinadas. Movimientos translacionales al N y menos probable al E se infieren en la misma. El arreglo de fallas neotectónicas de la península de Nicoya es asociado con la colisión de la cordillera del Coco bajo el margen convergente del centro y S de Costa Rica, el cual origina el escape tectónico del bloque del Antearco Centroamericano hacia el NW, paralelo a la fosa Mesoamericana.

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Late Miocene to recent plate tectonic history of the southern Central America convergent margin

Morell

2015

Geochem Geophys Geosyst

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New plate reconstructions constrain the tectonic evolution of the subducting Cocos and Nazca plates across the southern Central American subduction zone from late Miocene to recent. Because of the strong relationships between lower and upper (Caribbean) plate dynamics along this margin, these constraints have wide‐ranging implications for the timing and growth of upper plate deformation and volcanism in southern Central America. The reconstructions outline three important events in the Neogene history of this margin: (1) the coeval development of the Panama Triple Junction with the initiation of oblique subduction of the Nazca plate at ∼8.5 Ma; (2) the initiation of seamount and rough crust subduction beginning at ∼3–4 Ma; and (3) Cocos Ridge subduction from ∼2 to 3 Ma. A comparison of these events with independent geologic, geomorphic, volcanic, and stratigraphic data sets reveals that the timing, rates, and origin of subducting crust directly impacted the Neogene growth of upper plate deformation and volcanism in southern Central America. These analyses constrain the timing, geometry, and causes of a number of significant tectonic and volcanic processes, including rapid Plio‐Quaternary arc‐fore arc contraction due to Cocos Ridge subduction, the detachment of the Panama microplate at ∼1–3 Ma, and the late Miocene cessation of mantle‐wedge‐derived volcanism across ∼300 km of the subduction zone.

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Morphotectonics of the Pacific convergent margin of Costa Rica

Cited by 83 publications

References 20 publications

Expedition 344 summary

Expedition 344 summary

Fallamiento neotectónico de la península de Nicoya y su relación con el escape tectónico del antearco centroamericano

Late Miocene to recent plate tectonic history of the southern Central America convergent margin

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