Síntesis geocronológica del magmatismo, metamorfismo y metalogenia de Costa Rica, América Central

Alvarado, Guillermo E.; Gans, Phillipe B.

doi:10.15517/rgac.v0i46.1836

Cited by 29 publications

(97 citation statements)

References 86 publications

(377 reference statements)

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“…This andesitic stratovolcano pertains to the Miravalles-Zapote complex, whose activity started with the edification of the Guayabo volcano (1.17-1.0 Ma; Alvarado and Gans, 2012). The latter was destroyed by the following explosive activity (1.5 and 0.6 Ma) giving rise to the formation of the 15 km wide Guayabo caldera .…”

Section: Regional Setting and Volcanic Activitymentioning

confidence: 99%

“…The latter was destroyed by the following explosive activity (1.5 and 0.6 Ma) giving rise to the formation of the 15 km wide Guayabo caldera . The latter hosts Cabro Muco volcano (0.57-0.28 Ma), in the eastern sector, and Zapote and Miravalles volcanoes (<0.28 Ma) in the northern sector Alvarado and Gans, 2012). Tephrochronology data suggested that an important eruptive event occurred at about 5050 BC, whilst local witnesses reported a volcanic event on the 14th of September 1946 in the SW flank of Miravalles.…”

Section: Regional Setting and Volcanic Activitymentioning

confidence: 99%

“…The andesitic and basaltic lavas of Monteverde (2.17-1.92 Ma) are the basement of the Tenorio edifice that developed during two main eruptive phases, dated 0.74-0.54 and 0.37-0.26 Ma, respectively (Alvarado and Gans, 2012). The occurrence of a caldera in the southern flank was hypothesized by ICE (Istituto Costaricence de Electricidad) and ENEL (Italian Board of Electricity) (ICE, 1990), although Alvarado and Gans (2012) suggested that the depression should be regarded as a northernmost branch of the Arenal graben. No historical volcanic activity has likely occurred at TenorioMontezuma.…”

Section: Regional Setting and Volcanic Activitymentioning

confidence: 99%

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The Geothermal Resource in the Guanacaste Region (Costa Rica): New Hints From the Geochemistry of Naturally Discharging Fluids

et al. 2018

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The Guanacaste Geothermal Province (GGP) encompasses the three major volcanoes of northern Costa Rica, namely from NW to SE: Rincón de la Vieja, Miravalles, and Tenorio. The dominant occurrence of (i) SO 4 -rich acidic fluids at Rincón de la Vieja, (ii) Cl-rich mature fluids at Miravalles, and (iii) HCO − 3 -rich and low-temperature fluids at Tenorio was previously interpreted as due to a north-to-south general flow of thermal waters and a magmatic gas upwelling mostly centered at Rincón de la Vieja, whereas Miravalles volcano was regarded as fed by a typical geothermal reservoir consisting of a highly saline Na-Cl aquifer. The uniformity in chemical and isotopic (R/Ra and δ 34 S) compositions of the neutral Cl-rich waters suggested to state that all the thermal discharges in the GGP are linked at depth to a single, regional geothermal system. In this scenario, the thermal manifestations related to Tenorio volcano were regarded as a distal and diluted fluid outflow. In this study, a new gas geochemical dataset, including both chemical and isotopic (δ 13 C-CO 2 and R/Ra) parameters of fluid discharges from the three volcanoes, is presented and discussed. Particular attention was devoted to the Tenorio thermal manifestations, since they were poorly studied in the past because this area has been considered of low geothermal potential. The aim is to provide insights into the magmatic-hydrothermal fluid circulation and to verify the spatial distribution of the heat fluid source feeding the fluid manifestations. According to this new dataset, CO 2 , i.e., the most abundant dry gas in the fluid manifestations, is mostly produced by limestone, whereas the mantle CO 2 contribution is ≤3.3%. Strongly acidic gas compounds from magma degassing were absent in the discharged fluids, being scrubbed by secondary processes related to prolonged fluid-rock interactions and mixing with shallow aquifers. Our results only partially confirm the previously depicted model, because the geochemical and isotopic features (e.g., relatively high concentrations of temperature-dependent gases and high R/Ra values) shown by fluids seeping out from the southern sector of Tenorio volcano are more representative of medium-to-high enthalpy volcanic systems than those typically occurring in distal areas. This implies that the geothermal potential in the south of the GGP is higher than previously thought.

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Section: Regional Setting and Volcanic Activitymentioning

confidence: 99%

Section: Regional Setting and Volcanic Activitymentioning

confidence: 99%

Section: Regional Setting and Volcanic Activitymentioning

confidence: 99%

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The Geothermal Resource in the Guanacaste Region (Costa Rica): New Hints From the Geochemistry of Naturally Discharging Fluids

et al. 2018

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“…La estructura del Puente de Piedra es de origen volcánico y se encuentra dentro del edificio del estratovolcán complejo Poás, de edad < 1 Ma (Ruiz et al, 2010, Alvarado y Gans 2012. Comparativamente a nivel mundial con otros arcos naturales que tienen funcionabilidad en su parte superior (Cuadro 1), la edad de sus materiales es relativamente joven y es de tamaño pequeño.…”

Section: Ubicación Del Puente De Piedraunclassified

Evaluación integral de “Puente de Piedra”, Grecia, Costa Rica y su potencial turístico

Ruiz

Suárez

2017

Rev. Geol. Amér. Central

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Abstract:Puente de Piedra is a structure located in the southwest flank of the Poás volcano, originated from differential erosion processes active for thousands of years in volcanic rocks (ignimbrite deposits) by the Poró river. It was declared a natural heritage of Costa Rica on April 21, 1994, under the decree number 23 1111-06 and because of its nature as relatively young age (Middle Pleistocene), size and functionality is one of the few worldwide. For these reasons, its preservation is very important to be enjoyed by future generations. A geological and geomorphological characterization of the bridge is presented, also the region in which it is located, along with an assessment of their current status and inventory of damages, human activities that take place in the region are also identified and how the changes in them could negatively impact it in the future. To have the detailed geomorphological description of the bridge, we used a lidar survey and a 3D model to obtain all the parametric data that also can be use as historical memory of the structure. The results of this work can be the starting point for defining an intervention program, conservation and maintenance of the structure, also an incentive for the community of Grecia that can have greater tourist use of this site. Currently the tourism is detached and with no interconnections in terms of geological, biological and cultural aspects. Linking these fields could help to improve the development of communities near the volcano and take the first steps towards a concept of geopark. Keywords: natural bridge, differential erosion, lidar, evaluation, slopes, traffic, geopark.Resumen: El Puente de Piedra es una estructura ubicada en el flanco suroeste del volcán Poás, fue formada por procesos de erosión diferencial en rocas volcánicas (depósitos ignimbríticos) que han estado activos por miles de años, en el río Poró. Su importancia radica en que fue declarado patrimonio natural de Costa Rica el 21 de abril de 1994, bajo el decreto número 23 1111-06, y que por sus características como: edad (Pleistoceno Medio) tamaño y funcionalidad, es uno de los pocos que hay en el mundo. Por estas razones es que su preservación es muy importante para asegurar el disfrute por las próximas generaciones. Se presenta una caracterización geológica y geomorfológica no solo el puente, si no la región en la que está ubicado, además de la evaluación de su estado actual con un inventario de daños Ruiz, P. y Suárez, C. (2017). Evaluación integral de "Puente de Piedra", Grecia, Costa Rica y su potencial turístico.

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“…Such units were later classified as formations and were named Colima, Tiribí and Barva (SENARA-BGS, 1985). This volcanic activity has been explained as effusive fissure eruptions (Protti, 1986;Kussmaul, 1988in Alvarado & Gans, 2012, although some of them could be explained as volcanism from the medium to distal part of the Paleo-Volcanic Chain (Alvarado & Gans, 2012) and the Barva volcano whose activity began after the volcanic activity that generated the Aguacate Group.…”

Section: Geology Of the Central Valley Of Costa Ricamentioning

confidence: 99%

Volcanic Deposits and Volcanic Hazard in Santo Domingo de Heredia, Costa Rica

Rojas-Barrantes¹,

Arce²

2016

JGG

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The present research aims to investigate more precisely about the geology of the Eastern region of the Santo Domingo County. Santo Domingo is part of the structural plateau in the center of Costa Rica, which is located at the foot of the Cordillera Volcánica Central (CVF) [Central Volcanic Front] and is covered by volcanic deposits. On this plateau, called Central Valley, is the highest percentage of the population of the country and therefore, a large sector of the Costa Rican population is exposed to volcanic eruptions of the volcanoes in the CVF. For existing the national system for risk management and a law that demands actions to local authorities to prevent and mitigate disaster, it is necessary to identify the threats that exist in the cantons (counties) of Costa Rica. This will serve to take the prevention and mitigation actions necessary to reduce the impact of volcanic eruptions in the area of Santo Domingo.The research method consisted of review and analysis of previous works through literature research, data collection and analysis of boreholes from records of water-supply wells and open pits, and field work to better know the geology of the area. The results indicate that there are deposits of powerful volcanic eruptions of pyroclastic fall deposits (volcanic ash and lapilli) that mostly form clayey soils and lahars deposits that practically covers the entire territory. Underlying these deposits there is a pyroclastic flow deposit (ignimbrite), followed by lapilli tephra (a layer of pumice of at least 2 meters thick) that mark a change in the volcanic activity. Such pyroclastic flow is overlaid by an igneous presumably sub-volcanic activity of andesites interlayered with ancient tuffs, with a considerable thickness of over 350 meters according with borehole data and the exposure recognition on Pará river study sites. According to site locations (P1 to P23) of volcaniclastic deposits, there is evidence of an important environmental impact caused by the last eruptions of the CVF volcanoes. The real and current volcanic threat to the population of the County is the fall-out of ash emitted from the Turrialba and Irazú volcanoes. From local observations along the Virilla and Pará rivers sections, there is no evidence of younger pyroclastic flows overlying the volcanic sequence.

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Síntesis geocronológica del magmatismo, metamorfismo y metalogenia de Costa Rica, América Central

Cited by 29 publications

References 86 publications

The Geothermal Resource in the Guanacaste Region (Costa Rica): New Hints From the Geochemistry of Naturally Discharging Fluids

The Geothermal Resource in the Guanacaste Region (Costa Rica): New Hints From the Geochemistry of Naturally Discharging Fluids

Evaluación integral de “Puente de Piedra”, Grecia, Costa Rica y su potencial turístico

Volcanic Deposits and Volcanic Hazard in Santo Domingo de Heredia, Costa Rica

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