Plume–subduction interaction in southern Central America: Mantle upwelling and slab melting

Gazel, Esteban; Hoernle, Kaj; Carr, Michael J.; Herzberg, Claude; Saginor, Ian; Bogaard, Paul van den; Hauff, Folkmar; Feigenson, Mark D.; Swisher, Carl C.

doi:10.1016/j.lithos.2010.10.008

Cited by 131 publications

(228 citation statements)

References 110 publications

(232 reference statements)

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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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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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“…Although Cocos -Caribbean convergence has a much longer history Gazel et al 2009Gazel et al , 2011Alvarado and Gans 2012), in this review we will restrict discussion to Quaternary volcanism, focusing on the volcanic front where volcanism has been overwhelmingly concentrated during the Quaternary (Carr et al 1982(Carr et al , 2003(Carr et al , 2007a. Crustal thickness below the volcanic front is shallowest Figure 1.…”

Section: Tectonic Geologic and Volcanic Frameworkmentioning

confidence: 99%

“…Higher La/Yb implies a lower degree of partial melting or derivation from an enriched magma source. As shown in Figure 5, central Costa Rican volcanic rocks also have unusually enriched Pb isotopic compositions indicative of an enriched mantle source (Feigenson et al 2004;Hoernle et al 2008;Gazel et al 2009Gazel et al , 2011. The overall correlation between La/Yb and Pb isotope ratios indicates that enriched magma sources are present where La/Yb is >10 (Gazel et al , 2011.…”

mentioning

confidence: 94%

“…However, most studies have linked source enrichment to the influence of the Galapagos plume (Johnston and Thorkelson 1997;Abratis and Wörner 2001;Feigenson et al 2004;Goss and Kay 2006;Hoernle et al 2008;Gazel et al 2009Gazel et al , 2011, which has had a fundamental role in the history of both the Caribbean and Cocos plates (Sinton et al 1998;Werner et al 1999Werner et al , 2003Hauff et al 2000;Barckhausen et al 2001;Hoernle et al 2002;Denyer and Gazel 2009). Recall that the oceanic crust that subducts beneath central Costa Rica was formed at the CocosNazca spreading center, and then overprinted by Galapagos hotspot tracks (Werner et al 1999;O'Connor et al 2007).…”

mentioning

confidence: 99%

“…The Seamount Province is a recently arrived (<7 Ma) component; before that, the Galapagos interaction was dominated by a component similar to the Coiba and Cocos ridges that arrived at the subduction system ca. 15-10 Ma (Gazel et al 2011). Based on radiogenic isotope systematics, geochemical variations with time, and geochemical modeling, Gazel et al (2009) propose that the process to produce magmas with a Galapagos signature requires partial melting of subducting Galapagos tracks and reaction of those melts with the mantle wedge.…”

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confidence: 99%

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Igneous Rock Associations 13. Focusing on the Central American Subduction Zone

Walker

Gazel

2014

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Central America has recently been an important focus area for investigations into the complex processes occurring in subduction zones. Here we review some of the new findings concerning subduction input, magma production and evolution, and resultant volcanic output. In the Nicaraguan portion of the subduction zone, subduction input is unusually wet, likely caused by extensive serpentinization of the mantle portion of the incoming plate associated with bending-related faulting seaward of the Middle America trench. The atypical influx of water into the Nicaraguan section of the subduction zone ultimately leads to a regional maximum in the degree of mantle melting. In central Costa Rica, subduction input is also unusual in that it includes oceanic crust flavored by the Galapagos plume. Both of these exotic subduction inputs are recognizable in the compositions of magmas erupted along the volcanic front. In addition, Nicaraguan magmas bear a strong chemical imprint from subducting hemipelagic sediments. The high-field-strength-element depletions of magmas from El Salvador through Costa Rica are related to local variations in the depth to the subducting Cocos plate, and, therefore, to segmentation of the volcanic front. Minor phases, probably amphibole or rutile, control these variable depletions. Silicic magmas erupted along the volcanic front exhibit the same along-arc geochemical variations as their mafic brethren. This and their mantle-like radiogenic isotopic compositions suggest the production of juvenile continental crust all along the Central American subduction zone. Punctuated times of enhanced magmatic input from the mantle may aid in crustal development.SOMMAIREL’Amérique centrale a récemment été le lieu de recherches sur les processus complexes se produisant dans les zones de subduction. Ici nous passons en revue certaines découvertes sur nature des intrants de subduction, la production et l’évolution des magmas, ainsi que les extrants volcaniques résultants. Dans le segment nicaraguayen de la zone de subduction, les intrants de subduction sont exceptionnellement humides, probablement à cause de la serpentinisation généralisée de la portion mantélique de la plaque en subduction, fissurée par flexure dans partie marine de la fosse océanique de l’Amérique centrale. L'afflux atypique en eau dans le segment nicaraguayen de la zone de subduction induit ultimement un maximum régional de la proportion de fusion du manteau. Dans la portion centrale du Costa Rica l’intrant de subduction est lui aussi atypique en ce qu’il comprend une croûte océanique teintée par le panache des Galápagos. Ces deux intrants de subduction atypiques sont répercutés dans la composition des magmas éjectés le long du front volcanique. En outre, les magmas nicaraguayens affichent une forte empreinte chimique héritée des sédiments hémipélagiques en subduction. Les appauvrissements en éléments à fortes liaisons atomiques des magmas, du El Salvador jusqu’au Costa Rica, sont liés à des variations localisées de la profondeur de la plaque en subduction de Cocos, et donc, à la segmentation du front volcanique. Des phases mineures, probablement amphibole et rutile, déterminent ces appauvrissements variables. Les magmas siliceux éjectés le long du même front volcanique montrent les mêmes variations géochimiques le long de l’arc que leur contrepartie mafique. De plus, les compositions radiogéniques de leurs contreparties mantéliques évoquent la production d’une croûte continentale juvénile le long de la zone de subduction de l’Amérique centrale. Des épisodes d’accroissements ponctuels des intrants magmatiques du manteau peuvent contribuer au développement d’une croûte.

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Diverse magmatic effects of subducting a hot slab in SW Japan: Results from forward modeling

Kimura

Gill

Kunikiyo³

et al. 2014

Geochem Geophys Geosyst

211

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In response to the subduction of the young Shikoku Basin of the Philippine Sea Plate, arc magmas erupted in SW Japan throughout the late Cenozoic. Many magma types are present including ocean island basalt (OIB), shoshonite (SHO), arc-type alkali basalt (AB), typical subalkalic arc basalt (SAB), high-Mg andesite (HMA), and adakite (ADK). OIB erupted since the Japan Sea back-arc basin opened, whereas subsequent arc magmas accompanied subduction of the Shikoku Basin. However, there the origin of the magmas in relation to hot subduction is debated. Using new major and trace element and Sr-Nd-Pb-Hf isotope analyses of 324 lava samples from seven Quaternary volcanoes, we investigated the genetic conditions of the magma suites using a geochemical mass balance model, Arc Basalt Simulator version 4 (ABS4), that uses these data to solve for the parameters such as pressure/temperature of slab dehydration/melting and slab flux fraction, pressure, and temperature of mantle melting. The calculations suggest that those magmas originated from slab melts that induced flux melting of mantle peridotite. The suites differ mostly in the mass fraction of slab-melt flux, increasing from SHO through AB, SAB, HMA, to ADK. The pressure and temperature of mantle melting decreases in the same order. The suites differ secondarily in the ratio of altered oceanic crust to sediment in the source of the slab melt. The atypical suites associated with hot subduction result from unusually large mass fractions of slab melt and unusually cool mantle temperatures.

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Plume–subduction interaction in southern Central America: Mantle upwelling and slab melting

Cited by 131 publications

References 110 publications

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

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

Igneous Rock Associations 13. Focusing on the Central American Subduction Zone

Diverse magmatic effects of subducting a hot slab in SW Japan: Results from forward modeling

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