Slab decarbonation and CO2 recycling in the Southwestern Colombian volcanic arc

Marín-Cerón, María Isabel; Moriguti, Takuya; Makishima, Akio

doi:10.1016/j.gca.2009.10.031

Cited by 27 publications

(19 citation statements)

References 92 publications

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“…Carbonate melts from the melting of subducted sediments will interact with surrounding peridotite to carbonate the mantle (Rudnick et al, 1993;Tilton et al, 1998;Dasgupta et al, 2009). Many studies have documented that the metasomatism of mantle wedges above the subducting slab is predominantly constrained by two different processes, namely melting and devolatization (decarbonation and dehydration) of the subducted slab (e.g., Turner and Hawkesworth, 1997;Gorman et al, 2006;Poli et al, 2009;Marin-Ceron et al, 2010;Labanieh et al, 2012). The chemical compositions of the K-rich igneous rocks from the Awulale Montains presented here are consistent with a mantle source affected by slab decarbonation and dehydration rather than melting of subducted sediments.…”

Section: Mantle Wedge Metasomatismsupporting

confidence: 78%

“…However, the origin of carbonate melts and their relationship to associated silicate rocks is still controversial. In subduction zones, Sr-Nd-Pb and C-O isotopes have been interpreted to indicate that most carbonate melts associated with alkaline igneous rocks were derived from the recycling of subducted carbonate-rich sediments (e.g., Bell and Simonetti, 1996;van Achterbergh et al, 2002;Walter et al, 2008;Marin-Ceron et al, 2010;Frezzotti et al, 2011). Therefore, the occurrence and genesis of primary carbonate-bearing K-rich igneous rocks in the convergent margins can be utilized to help understanding crust-mantle interaction and can provide insights into the mechanisms of carbon-recycling within the mantle wedge during subduction.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Geochemistry of primary-carbonate bearing K-rich igneous rocks in the Awulale Mountains, western Tianshan: Implications for carbon-recycling in subduction zone

Yang

Niu

Shan

et al. 2014

Geochimica et Cosmochimica Acta

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Section: Mantle Wedge Metasomatismsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Geochemistry of primary-carbonate bearing K-rich igneous rocks in the Awulale Mountains, western Tianshan: Implications for carbon-recycling in subduction zone

Yang

Niu

Shan

et al. 2014

Geochimica et Cosmochimica Acta

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“…Otras posibilidades mencionan fusión de la cuña mantélica por los fluidos de la placa subducente, o fusión parcial de corteza inferior máfica (Chiaradia et al, 2009). Pero algunos de estos mismos procesos petrogenéticos son invocados para explicar los patrones geoquímicos de los volcanes del sur de Colombia, cuyos productos en general no tienen afinidad adaquítica (e.g., Droux and Delaloye, 1996;Calvache and Williams, 1997;Marín-Cerón et al, 2010).…”

Section: Discussionunclassified

Vulcanismo De Afinidad Adaquítica en El Miembro Inferior De La Formación Combia (Mioceno Tardío) Al Sur De La Subcuenca De Amaga, Noroccidente De Colombia

Borrero¹,

Toro-Toro²

2016

Bol. Geol.

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RESUMENEn este trabajo se presenta la química de los depósitos volcaniclásticos del Miembro Inferior de la Formación Combia y los cuerpos sub-volcánicos que la intruyen, aflorantes en la parte sur de la subcuenca de Amagá, en el valle interandino del río Cauca, Colombia. Corresponden a una suite andesítica-dacítica calcoalcalina de medio K con contenido de SiO 2 entre 59,04 y 62,86%, y solo una muestra corresponde a un basalto toleítico (SiO 2 =50,6%). Las muestras se identifican por tener altas proporciones de LILE/HFSE, Ba/LREE, Sr/Nd, y empobrecimiento relativo en Nb y Ta, típicas de magmas de una zona de subducción. El diagrama multielemental de tierras raras indica que dos muestras tienen relaciones diferentes de MREE/HREE (Gd/Yb) >3,9 y de LREE/HREE (La/Yb) > 19,7 que las separa del resto de las muestras. La mayoría de las muestras presentan firmas adaquíticas caracterizadas por: Nd/ 144 Nd= 0,512849 -0,512907, los cuales sugieren una fuente manto derivada, previamente metasomatizada con fluidos del slab, sin descartar la fusión parcial de la misma, con generación de los magmas adaquíticos en niveles profundos de la corteza. Las rocas y depósitos aquí descritos corresponden a un segmento del arco magmático calcoalcalino de edad Mioceno que se extiende en el norte de los Andes. En el Miembro Inferior de La Formación Combia, en el sur de la subcuenca de Amagá, se debería incluir los cuerpos sub-volcánicos que la intruyen como una suite de afinidad adaquítica.Palabras clave: Formación Combia, magmatismo de arco, adaquitas, manto derivado, noroeste de Colombia ADAKITE-LIKE SIGNATURE IN THE LOWER MEMBER OF THE COMBIA FORMATION (LATE MIOCENE) AT THE SOUTHERN OF AMAGÁ SUB-BASIN,NORTHWEST COLOMBIA ABSTRACTIn this study, we report chemistry of samples of the volcaniclastic deposits from the Lower Member of the Combia Formation and the intruding sub-volcanic bodies. These rocks are located at the southern of Amagá sub-basin of the Cauca River, Colombia. Most of the samples correspond to a medium-K calc-alkaline andesitic-dacitic suite (SiO 2 =59, 04 -62,86 wt. %), and only one is a toleiitic basalt SiO 2 =50,6 wt%. The samples have high LILE/HFSE, Ba/LREE, Sr/ Nd ratios and Nb and Ta relative depletion, typical of magmas in a subduction system. The REE patterns show that two samples have high MREE/HREE and LREE/HREE ratios (Gd/Yb >3,9 and La/Yb > 19,7) in comparison with the rest of the samples. Nd= 0,512849 -0,512907 are indicative of melts from a mantle-derived source, although an interaction with slab melts is not discarded, and the adakitic magmas were generated at the base of the crust. The volcanic sequence described in this study is a segment of the Miocene magmatic arc extending along the northern Andes. According to our results, in the Lower Member of the Combia Formation, at the southernmost Amagá sub-basin sector, it must be included the intruding subvolcanic bodies as an adakitic suite.

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“…In these two cases the increase in V P /V S would be due to the addition of mafic materials to a mostly felsic crust, as mafic rocks have higher associated values of V P /V S [Christensen, 1996]. The presence of partial melt can also increase the values of V P /V S [Nakajima et al, 2001]; although it seems like the magmas in the region assimilate lower crustal materials [Marín-Cerón et al, 2010], there is still no evidence for pervasive melting in the crust associated with these volcanic centers [Weber et al, 2002]. The existence of fluids in pores and fractures can also increase this ratio [Thurber et al, 1997]; in this case, the fluids would be associated with the magmatic activity, increasing the mean Poisson ratio for the whole crust [Agostinetti and Amato, 2009].…”

Section: Discussionmentioning

confidence: 99%

Receiver functions and crustal structure of the northwestern Andean region, Colombia

2015

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We used the receiver function technique to deduce crustal thickness beneath the northwestern Andean system, using data from the permanent seismic network of Colombia, combined with some of the IRIS and CTBTO stations in Colombia and Ecuador. The estimation of crustal thickness was made using the primary P to s conversion and crustal reverberations. The bulk crustal V P /V S ratio was constrained using a crustal thickness versus V P /V S stacking method, in addition to estimations using a time to depth conversion technique based on results of a modified Wadati diagram analysis. We observed a wide range of crustal thicknesses, including values around 17 km beneath the Malpelo Island on the Pacific Ocean, 20 to 30 km at the coastal Pacific and Caribbean plains of Colombia, 25 to 40 km beneath the eastern plains and foothills, 35 km beneath the Western Cordillera, 45 km at the Magdalena River intermountain valley, 52 to 58 km under the northern Central Cordillera, and reaching almost 60 km beneath some of the volcanoes of the Southern Cordilleran system of Colombia; crustal thickness can be slightly greater than 60 km beneath the plateau of the Eastern Cordillera. The values of V P /V S are particularly high for some of the stations on the volcanic centers, reaching values above 1.79, probably related to the addition of mafic materials to the lower crust, and in the plateau of the Eastern Cordillera near Bogota, where we speculate about the possibility of crustal seismic anisotropy associated with shear zones.

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Slab decarbonation and CO2 recycling in the Southwestern Colombian volcanic arc

Cited by 27 publications

References 92 publications

Geochemistry of primary-carbonate bearing K-rich igneous rocks in the Awulale Mountains, western Tianshan: Implications for carbon-recycling in subduction zone

Geochemistry of primary-carbonate bearing K-rich igneous rocks in the Awulale Mountains, western Tianshan: Implications for carbon-recycling in subduction zone

Vulcanismo De Afinidad Adaquítica en El Miembro Inferior De La Formación Combia (Mioceno Tardío) Al Sur De La Subcuenca De Amaga, Noroccidente De Colombia

Receiver functions and crustal structure of the northwestern Andean region, Colombia

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