Galapagos‐OIB signature in southern Central America: Mantle refertilization by arc–hot spot interaction

Gazel, Esteban; Carr, Michael J.; Hoernle, Kaj; Feigenson, Mark D.; Szymanski, David W.; Hauff, Folkmar; Bogaard, Paul van den

doi:10.1029/2008gc002246

Cited by 112 publications

(239 citation statements)

References 83 publications

(140 reference statements)

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“…Petrographic analysis confirms explosive volcanism registered in the volcaniclastic deposits of ancient tuffs in the geologic record. The presence of orthopyroxene as a phenocryst fase in sample P3 ( Figure 6A), is in good agreement with the presence of this mineral in basaltic lavas in central Costa Rica since the Late Miocene, as a product of change in the source by metasomatic addition of silicate-rich melts to the mantle source (Gazel et al, 2009).…”

Section: Discussionsupporting

confidence: 61%

“…The CVF of Costa Rica is defined as the Northern domain geochemically distinctive with Galapagos-OIB signature, compare with the rest of the Central American volcanism (Gazel et al, 2009). The CVF of Costa Rica is constituted of massive composite shield volcanoes, Platanar, Poás, Barba, Irazú, and Turrialba, the largest in both area and volume of the CAVF.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

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

Rojas-Barrantes¹,

Arce²

2016

JGG

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“…Dentro de los trabajos aledaños a la hoja Tapantí, se pueden citar a Denyer y Alvarado (2007), Denyer y Arias (1991), Fernández (1987) y Krushensky (1972), así como publicaciones de síntesis sobre las características químicas, como Gazel et al, 2009, Gazel et al, 2011. La compilación de edades radiométricas de Alvarado y Gans (2012) fue utilizada como referencia para establecer el contexto geológico regional del cuadrante Tapantí.…”

Section: Antecedentesunclassified

Geología del cuadrante Tapantí (1:50 000), Costa Rica

Sojo

Denyer

Gazel

et al. 2017

Rev. Geol. Amér. Central

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ABSTRACT:We present a geologic map of the Tapantí quadrangle, which is located in the central region of Costa Rica and belongs to the Central Costa Rica Deformed Belt (CCRDB). The CCRDB is a consequence of the interaction of the Cocos Ridge and the Western edge of the Panama microplate. The oldest rocks mapped in this work are Miocene in age and theyvbelongs to Pacacua, Peña Negra and Coris formations, than form the western edge of the Candelaria basin. Three igneous events were distinguished. First, the Miocene volcanic arc, which is represented by the rocks of La Cruz Formation and the clasts of Pacacua Formation. Another period of igneous activity was recorded in Grifo Alto and Doán formations and the Tapantí Intrusive, with an age range of 0.6-0.03 Ma. From a geochemical point of view is remarkable a change between 10 to 6 Ma, enrichment of K and Si and changes in U, Sr, Ba and La concentrations. This change corresponds with the Cocos Ridge arriving to the Middle America Trench and it is visible because the Pliocene magmatic arc, the Pliocene intrusive of Tapantí and the nowadays volcanic arc. The structural model suggests the existence of two deformation events, the first occurred during the period of time between Late Miocene and Pliocene and it formed the Folding Zone Orosi-Patarrá, and the second one corresponds to the establishment of CCRDB, from Pliocene to present, which is constituted by left lateral faults bearing ENE and right lateral faults bearing NW.

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“…The complexity of the MVB might be similar to (or even greater than) that of southern Central America from central Costa Rica to Panama, where unlike Guatemala to northwestern Costa Rica, the geochemistry is not arclike, and a plethora of different models have been put forth (Defant et al, 1992;Russo and Silver, 1994;Herrstrom et al, 1995;Johnston and Thorkelson, 1997;Harry and Green, 1999;Abratis and Wörner, 2001;Feigenson et al, 2004;Gazel et al, 2009). Now, if one really wants to change the widely accepted name of the Mexican Volcanic Belt (MVB), or the TransMexican Volcanic Belt (TMVB), as called by numerous researchers (see the references in this work), it should better be called a continental rift.…”

Section: A New Tectono-petrogenetic Modelmentioning

confidence: 99%

Present state of knowledge and new geochemical constraints on the central part of the Mexican Volcanic Belt and comparison with the Central American Volcanic Arc in terms of near and far trench magmas

Verma¹

2015

Turkish J Earth Sci

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A brief critical review is presented of the geological, geophysical, geochemical, and plate tectonic evidence for the origin and evolution of the central part of the Mexican Volcanic Belt (C-MVB). Databases were constructed for the C-MVB from new and published data as well as for the Central American Volcanic Arc (CAVA), other continental and island arcs, continental rifts or extensional areas, and collision zones. Conventional procedures as well as statistical techniques of multidimensional tectonic discrimination diagrams and significance tests were used to interpret the data. A subdivision of the databases for the C-MVB and CAVA into near the trench or front-arc and far from the trench or backarc magmas helped to demonstrate the lack of slab input for the C-MVB and the presence of a classic arc-trench system for the CAVA. The use of software IgRoCS, DODESSYS, UDASYS, TecD, and TecDIA provided the following conclusions: 1) basic magmas in the C-MVB that originated in the mantle without the involvement of the subducted slab represent a continental rift setting; 2) C-MVB acid and intermediate magmas that originated, respectively, from the crust and mixed mantle-crustal sources do not show a clear influence of the present subducted slab and represent the tectonic setting of the older crustal and mixed mantle-crustal source rocks; and 3) all rocks in the CAVA were derived from the involvement of the subducted slab and represent a classical continental arc system related to the subduction of the Cocos plate beneath the Caribbean plate, whereas CAVA back-arc rocks originated mainly in the mantle, probably with much less involvement of the subducted slab. Reinterpretation of the Sr, Nd, Pb, and Hf isotopic data supports these inferences. I propose a new tectono-petrogenetic model based on the continuation of the extensional tectonics related to the triple rift system in the western part of the MVB.

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Galapagos‐OIB signature in southern Central America: Mantle refertilization by arc–hot spot interaction

Cited by 112 publications

References 83 publications

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

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

Geología del cuadrante Tapantí (1:50 000), Costa Rica

Present state of knowledge and new geochemical constraints on the central part of the Mexican Volcanic Belt and comparison with the Central American Volcanic Arc in terms of near and far trench magmas

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