English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

espanolLas calizas de la Formacion Fila de Cal constituyen la mayor secuencia de plataforma carbonatada de Costa Rica al extenderse por mas de 180 km, desde el rio Savegre hasta la region de David en Panama. El analisis detallado de microfacies y micropaleontologico de las asociaciones de macroforaminiferos de 22 muestras de roca provenientes de afloramientos representativos revelan tres facies carbonatadas principales: (1) espiculitas de Eoannularia eocenica del Eoceno Medio, (2) facies de grandes lepidociclinas y nummulites del Eoceno Superior caracterizada por Lepidocyclina chaperi-Lepidocyclina tobleri panamensis y (3) facies de Lepidocyclina yurnagunensis-Lepidocyclina undosa del Oligoceno Inferior (Rupeliense). Estas tres facies, bioestratigraficamente sucesivas, documentan alrededor de 14 a 19 M.a. de continua sedimentacion carbonatada neritica en la region frontal del arco. Durante este tiempo, grandes comunidades de organismos bentonicos: macroforaminiferos, algas calcareas, corales, briozoos, moluscos y equinodermos crecieron en aguas tropicales calidas para formar la plataforma mas extensa y duradera de Costa Rica. La sedimentacion carbonatada termino de forma abrupta con la acumulacion de depositos volcaniclasticos de plataforma y talud de la Formacion Terraba. Tectonicamente, el desarrollo de la plataforma coincidio con altas tasas de convergencia de la placa Farallon por debajo de America Central, que condujo a fuerte levantamiento del arco y extensas areas neriticas. La correlacion con secuencias carbonatadas contemporaneas indican que la proximidad de las plataformas al arco interno y la fuerte subsidencia en respuesta a la emersion de nuevos edificios volcanicos son probablemente los factores que determinaron el crecimiento y persistencia de ambientes carbonatados en arcos intraoceanicos. EnglishThe limestones of the Fila de Cal Formation build the largest carbonate platform sequence of Costa Rica extending over 180 km from southern Costa Rica into the Panamanian boarder area of David. The detailed limestone microfacies analysis and micropaleontologic dating based on the contained larger foraminiferal assemblages of 22 samples selected from the most representative exposures reveal three main carbonate facies: (1) Eoannularia eocenica-bearing spiculite facies from the Middle Eocene, (2) large lepidocyclinid-nummilitid facies from the Upper Eocene lead by the Lepidocyclina chaperi-Lepidocyclina tobleri panamensis assemblage and (3) dominant Lower Oligocene Lepidocyclina yurnagunensis-Lepidocyclina undosa assemblage. These three biostratigraphically successive facies record circa 14 to 19 m.y. of continuous shallow-marine carbonate sedimentation in the Pacific frontal arc region of southern Costa Rica. During this time large communities of benthic organisms: larger foraminifera, calcareous algae, corals, bryozoans, mollusks and equinoderms rapidly grew in warm tropical waters to build the largest and long-lasting carbonate platform on the Costa Rican arc. The carbonate sedimentation ended abruptly with accumulation of thick volcaniclastic marine platform-to-slope deposits of the Terraba Formation. Tectonically, the Fila de Cal carbonate platform development coincides with rapid convergence rates of the Farallon plate beneath southern Central America leading to strong arc uplift and new widespread neritic environments. The correlation with contemporaneous carbonate arc sequences clearly indicates that primarily their proximity to the inner volcanic arc areas and strong subsidence in response to emerging volcanic edifices are probably the main factors that controlled growing and persistence of carbonate environments within the arc setting.

revista geológica de américa central

Carbonate Platform Development in an Intraoceanic Arc Setting: Costa Rica’s Largest Limestone Sequence - The Fila de Cal Formation (Middle Eocene to Lower Oligocene)