Overview of the Tectonics and Geodynamics of Costa Rica

Vannucchi, Paola; Morgan, Jason Phipps

doi:10.1007/978-3-319-02156-0_1

Cited by 5 publications

(2 citation statements)

References 57 publications

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“…This is supported by receiver function studies (Dzierma et al., 2010), finding discontinuous Moho morphologies at the CCRVF and Talamanca boundary. Proposed limits of the CCRDB from previous authors (Brandes et al., 2016; Vannucchi & Morgan, 2019) also correspond with our observations, although they did not identify such a sharp transition across the Talamanca Cordillera.…”

Section: Discussionsupporting

confidence: 92%

Magmatic and Tectonic Domains of Central Costa Rica and the Irazú‐Turrialba Volcanic Complex Revealed by Ambient Noise Tomography

et al. 2022

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Subduction driven processes in Costa Rica led to the development of volcanism, forming the active Central Costa Rican Volcanic Front (CCRVF). Located at the southernmost tip of the CCRVF is the active twin volcanic system, the Irazú-Turrialba Volcanic Complex (ITVC), 50 km north-east from Costa Rica's capital city, San Jose (Figure 1). The summits of each volcano are 10 km apart and form a complex that is about 60 km by 45 km at the base. To better understand these magmatic and tectonic domains, establishing the crustal structures beneath volcanic systems provides vital information into the implications of volcanism in Costa Rica.Despite being geographically close, the Irazú and Turrialba volcanoes undergo different eruptive cycles. This may partially be explained by the complex magmatic interactions between different reservoirs at depth as highlighted by geochemical and petrological data (Alvarado et al., 2006;DeVitre et al., 2019). Alvarado et al. (2006) suggest that Irazú is fed by two distinct magmatic reservoirs evolving in parallel and occasionally mixing. The

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Section: Discussionsupporting

confidence: 92%

Magmatic and Tectonic Domains of Central Costa Rica and the Irazú‐Turrialba Volcanic Complex Revealed by Ambient Noise Tomography

et al. 2022

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“…Poás is one of the most active volcanoes of the Central American Volcanic Arc. Its activity is mostly characterized by phreatic and phreatomagmatic eruption cycles at the Main Crater during the last 200 years (Alvarado, 2009;Ruíz et al, 2010;Mora-Amador et al, 2019a;Rouwet et al, 2019;Vannucchi and Morgan, 2019). The maximum age of the deposits that compose Poás volcano is about 600 ka.…”

Section: Geological Settingmentioning

confidence: 99%

Rare Earth Elements Variations in a Hyperacid Crater Lake and Their Relations With Changes in Phreatic Activity, Physico-Chemical Parameters, and Chemical Composition: The Case of Poás Volcano (Costa Rica)

et al. 2022

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Decades of geochemical monitoring at active crater lakes worldwide have confirmed that variations in major elements and physico-chemical parameters are useful to detect changes in volcanic activity. However, it is still arduous to identify precursors of single phreatic eruptions. During the unrest phase of 2009–2016, at least 679 phreatic eruptions occurred at the hyperacid and hypersaline crater lake Laguna Caliente of Poás volcano (Costa Rica). In this study, we investigate the temporal variations of Rare Earth Elements (REE) dissolved in Laguna Caliente in order to 1) scrutinize if they can be used as a new geochemical tool to monitor changes of phreatic activity at hyperacid crater lakes and 2) identify the geochemical processes responsible for the variations of REE concentrations in the lake. The total concentration of REE varies from 950 to 2,773 μg kg−1. (La/Pr)N-local rock ratios range from 0.93 to 1.35, and Light REE over Heavy REE (LREE/HREE)N-local rock ratios vary from 0.71 to 0.95. These same parameters vary in relation to significant changes in phreatic activity; in particular, the (La/Pr)N-local rock ratio increases as phreatic activity increases, while that of (LREE/HREE)N-local rock decreases when phreatic activity increases. REE concentrations and their ratios were compared with the variations of major elements and physico-chemical parameters of the lake. Calcium versus (La/Pr)N-local rock and versus (LREE/HREE)N-local rock ratios show different trends compared to the other major elements (Na, K, Mg, Al, Fe, SO4, and Cl). Moreover, a higher loss of Ca (up to 2,835 ppm) in lake water was found with respect to the loss of Al, K, and Na. This loss of Ca is argued to be due to gypsum precipitation, a process corroborated by the mass balance calculation simulating the precipitation of gypsum and the contemporaneous removal of REE from the lake water. The observed relations between REE, changes in phreatic activity, and the parameters commonly used for the monitoring of hyperacid volcanic lakes encourage investigating more on the temporal and cause-effect relationship between REE dynamics and changes in phreatic activity at crater lake-bearing volcanoes.

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Geochemical and Geochronological Characterisation of the Poas Stratovolcano Stratigraphy

et al. 2019

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Overview of the Tectonics and Geodynamics of Costa Rica

Cited by 5 publications

References 57 publications

Magmatic and Tectonic Domains of Central Costa Rica and the Irazú‐Turrialba Volcanic Complex Revealed by Ambient Noise Tomography

Magmatic and Tectonic Domains of Central Costa Rica and the Irazú‐Turrialba Volcanic Complex Revealed by Ambient Noise Tomography

Rare Earth Elements Variations in a Hyperacid Crater Lake and Their Relations With Changes in Phreatic Activity, Physico-Chemical Parameters, and Chemical Composition: The Case of Poás Volcano (Costa Rica)

Geochemical and Geochronological Characterisation of the Poas Stratovolcano Stratigraphy

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