Terciario del sur del Valle Central: sección estratigáfica del Cerro Caraigres, provincia de San José, Costa Rica

Renardy, François; Calvo, Claudio

doi:10.15517/rgac.v0i09.12966

Cited by 7 publications

(17 citation statements)

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“…2). This fracture zone extends towards mainland Costa Rica, where it joins a system of braided transcurrent faults in the Valle Central area (Montero & Dewey, 1982), which has been active since at least the Oligocene (Rivier & Calvo, 1988;Astorga et al, 1989). Further to the east, it merges in the Lim6n thrust belt, thus dissecting the isthmus into two tectonically independent parts (Astorga et al, 1989;compare Figs I, 2).…”

Section: Southern Costa Ricamentioning

confidence: 99%

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Anatomy of an Evolving Island Arc: Tectonic and Eustatic Control in the South Central American Fore‐Arc Area

Seyfried

Astorga

Amann

et al. 1991

Sedimentation, Tectonics and Eustasy

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The southern part of the Central Ameriean isthmus is the product of an island arc. It evolved initially as a ridge of primitive island-arc tholeiites at a collision zone between the Farall6n plate and protoCaribbean crust (Albian-Santonian). During the Campanian. a major tectonic event (most probably subduction reversal) causcd decollement of differcnt units of the former plate margin. The rcsultmg structural high was covered by a carbonate platform. From Maastrichtian to Eocenc times continuous subduetion produced a stable morphotcctonic configuration (trench-slope-outer-arc-fore-arccalcalkaline-arc). Fore-arc sedimentation was controlled by volcaniclastic input and tectonic activity along the outer arc's inner margin. Eustatic control is essentially recognized through lowstand sIgnals such as extensive turbidite sand lobes. Steady accretionary uplift of the outer arc gradually closed the bypasses between fore-arc and trench slope. Eustatic control is verified by lowstand signals (sands) on the trench slope and highstand signals on the outer arc (carbonate ramps). During the Oligocene another major tectonic event affected the entire system: accretion ceased, segments decoupled, and regional compression resulted in general uplift and erosion. From latest Oligocene to Pliocene times, three episodes of tilting created a series of fault-angle depressions. Subsidence varies enormously among these basins. but sedimentation is largely shallow marine. Facies architecture reflects complex interactions between tectonic processes, changes in volcaniclastic sediment supply. and eustasy. Subsequently. very strong explosive volcanic activity resulted in excessive sediment input that overfilled most basins. The history of the island arc shows that tectonic processes largely controlled composition. distribution. and geometry of the major sedimentary units. Eustatic signals do indeed occur when they are expected, but may be considered as an overprint rather than a dommating factor.

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Section: Southern Costa Ricamentioning

confidence: 99%

“…It extends from the Honduran Pacific coastal borderlands through Nicaragua (Lake Managua and Lake Nicaragua) to northern Costa Rica, where the southeastern termin- (1989). Rivier & Calvo (1988). Corrigan (1986).…”

Section: Northern Costa Ricamentioning

confidence: 99%

Anatomy of an Evolving Island Arc: Tectonic and Eustatic Control in the South Central American Fore‐Arc Area

Seyfried

Astorga

Amann

et al. 1991

Sedimentation, Tectonics and Eustasy

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“…En el sur del Valle Central está expuesta una secuencia sedimentaria terciaria del margen sur de la cuenca, formando una importante estructura homoclinal O c é a n o P a c íf ic o que buza hacia el norte. La sección estratigráfica del cerro Caraigres, descrita originalmente por Rivier & Calvo (1988), muestra una secuencia que sobrepasa los 4000 m de espesor, la cual incluye sedimentos carbonatados y volcaniclásti-cos de ambiente nerítico. La secuencia se inicia con las calizas eocenas de la Formación Parritilla, que son el objetivo de este estudio.…”

Section: Contexto Geológico Y Estratigráficounclassified

“…Hacia el techo, las calizas pasan concordantemente a una potente secuencia volcaniclástica de más de 1000 m de espesor. Rivier & Calvo (1988) agrupan esta secuencia en la Formación Pacacua, mientras que Denyer & Arias (1991) la consideran como unidad independiente, denominándola Formación Caraigres. El contacto entre ambas unidades está marcado por una serie de arenitas híbri-das, volcaniclásticas.…”

Section: Contexto Geológico Y Estratigráficounclassified

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Calizas lutetianas del arco interno Paleógeno de Costa Rica

Bolz¹,

Calvo²

2011

Rev. Geol. Amér. Central

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ABSTRACT:We present new sedimentologic and biostratigraphic data on the shallow-water limestone sequence of the quebrada Concha, the type locality of the Eocene Parritilla Formation in central Costa Rica. This unit appears at the base of the about 4.500 m thick sedimentary sequence of the Cenozoic Valle Central basin, unconformably overlying the Nicoya ophiolite complex. The Parritilla limestone contain a rich larger foraminiferal fauna from the early Middle Eocene (Lutetian) represented by well-preserved and diverse specimens of the Amphistegina-Helicostegina-Lepidocyclina(Polylepidina) phylogenetic line. On the basis of the high biostratigraphic resolution of the analyzed foraminiferal assemblage, we define the quebrada Concha sequence as a Lutetian type locality of Costa Rica and erect a new Eocene chronostratigraphic unit: the Parritillian. From a sedimentologic perspective, the Parritilla limestones represent a bioclastic carbonate sequence deposited on the southern border of the inner-arc basin in an open shallow-marine environment with locally restricted water circulation. In the study area, the uplifted ophiolite complex probably formed part of a neritic arc platform surrounding the volcanic edifices. Although Lutetian carbonate sedimentation began in response to a rapid marine transgression at ~49 Ma over the exposed basement, the carbonate development itself terminated abruptly with the deposition of the volcaniclastic sequence of the Caraigres Formation, resulting from the Eocene volcanic activity in adjoining areas. As suggested by these voluminous volcaniclastic deposits conformably overlying the Parritilla limestone sequence, the strong subsidence of the Lutetian arc platform was probably related to emergent andesitic edifices in the inner arc region of central Costa Rica. RESUMEN:Presentamos un estudio sedimentológico y bioestratigráfico de las calizas eocenas de la quebrada Concha, localidad tipo de la Formación Parritilla, ubicada en el sur del Valle Central de Costa Rica. Es una secuencia bioclástica de plataforma carbonatada de 150 m de espesor, depositada discordantemente sobre rocas cretácicas del Complejo de Nicoya, formando la base de la secuencia sedimentaria cenozoica de la cuenca intra-arco del Valle Central. Las asociaciones de macroforaminíferos de las calizas analizadas se caracterizan por especies de la línea filogenética Amphistegina-Helicostegina-Lepidocyclina (Polylepidina), típicas del Eoceno Medio, especialmente de la parte basal e inferior (Lutetiano). Con base en la alta resolución bioestratigráfica de esta asociación de foraminíferos, consideramos la quebrada Concha como localidad tipo del Lutetiano e introducimos una unidad cronoestratigráfica para el Eoceno Medio, la cual denominamos Parritillano, sinónimo del Lutetiano en Costa Rica. Sedimentológicamente las calizas de Parritilla representan acumulaciones bioclásticas de organismos bentónicos, depositadas sobre el basamento ofiolítico levantado en un ambiente marino somero y abierto, localmente bajo condiciones restringui...

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Tectono‐stratigraphic response of the Sandino Forearc Basin (N‐Costa Rica and W‐Nicaragua) to episodes of rough crust and oblique subduction

Andjić

Baumgartner‐Mora

Baumgartner

et al. 2018

The Depositional Record

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The southern Central American active margin is a world-class site where past and present subduction processes have been extensively studied. Tectonic erosion/accretion and oblique/orthogonal subduction are thought to alternate in space and time along the Middle American Trench. These processes may cause various responses in the upper plate, such as uplift/subsidence, deformation, and volcanic arc migration/shut-off. We present an updated stratigraphic framework of the Late Cretaceous-Cenozoic Sandino Forearc Basin (SFB) which provides evidence of sedimentary response to tectonic events. Since its inception, the basin was predominantly filled with deep-water volcaniclastic deposits. In contrast, shallow-water deposits appeared episodically in the basin record and are considered as tectonic event markers. The SFB stretches for about 300 km and varies in thickness from 5 km (southern part) to about 16 km (northern part). The drastic, along-basin, thickness variation appears to be the result of (1) differential tectonic evolutions and (2) differential rates of sediment supply. (1) The northern SFB did not experience major tectonic events. In contrast, the reduced thickness of the southern SFB (5 km) is the result of at least four uplift phases related to the collision/accretion of bathymetric reliefs on the incoming plate: (i) the accretion of a buoyant oceanic plateau (Nicoya Complex) during the middle Campanian; (ii) the collision of an oceanic plateau (?) during the late Danian-Selandian; (iii) the collision/accretion of seamounts during the late Eocene-early Oligocene; (iv) the collision of seamounts and ridges during the Pliocene-Holocene. (2) The northwestward thickening of the SFB may have been enhanced by high sediment supply in the Fonseca Gulf area which reflects sourcing from wide, high relief drainage basins. In contrast, sedimentary input has possibly been lower along the southern SFB, due to the proximity of the narrow, lowland isthmus of southern Central America. Moreover, two phases of strongly oblique subduction affected the margin, producing strike-slip faulting in the forearc basin: (1) prior to the Farallon Plate breakup, an Oligocene transpressional phase caused deformation and uplift of the basin depocenter, triggering shallowing-upward of the Nicaraguan Isthmus in the central and northern SFB; (2) a Pleistocene--

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Terciario del sur del Valle Central: sección estratigáfica del Cerro Caraigres, provincia de San José, Costa Rica

Cited by 7 publications

References 0 publications

Anatomy of an Evolving Island Arc: Tectonic and Eustatic Control in the South Central American Fore‐Arc Area

Anatomy of an Evolving Island Arc: Tectonic and Eustatic Control in the South Central American Fore‐Arc Area

Calizas lutetianas del arco interno Paleógeno de Costa Rica

Tectono‐stratigraphic response of the Sandino Forearc Basin (N‐Costa Rica and W‐Nicaragua) to episodes of rough crust and oblique subduction

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