Local and regional variations in Central American arc lavas controlled by variations in subducted sediment input

Patino, L. C.; Carr, Michael J.; Feigenson, Mark D.

doi:10.1007/s004100050562

Cited by 295 publications

(320 citation statements)

References 59 publications

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“…Such an enhanced slab contribution to the volcanic output in Nicaragua agrees with prior ¢ndings (i.e. 10 Be [7], B/La [8], Ba/La [4,5], etc.). There are two possible explanations for this observation: (1) o¡-scraping of sediments in Costa Rica [15] and (2) a warmer thermal regime in Costa Rica possibly associated with subduction of the Cocos ridge (a hotspot-related oceanic plateau) and/or the trace of the Galapagos hotspot [20].…”

Section: Sources Of Cosupporting

confidence: 90%

“…5. The (L+S)/M ratios in Costa Rica ( = 10) and Nicaragua ( = 16) support the suggestion of an enhanced slab £ux to the volcanic output in Nicaragua, consistent with prior ¢ndings [1,4,5,7,8,13]. 6.…”

Section: Mass Balance At Subduction Zonessupporting

confidence: 78%

“…In both cases we assume a crustal density of 2.89 g/cm 3 . In the ¢rst case we calculate a CO 2 input of 1.10U10 5 Mmol/yr, which is essentially indistinguishable from a value of 1.08U10 5 Mmol/yr calculated in the second case. Since the age of the subducting crust is 23 þ 5 Myr and precipitation of carbonates within the crust may persist for up to 100 Myr [44], these estimates represent maximum values.…”

Section: Mass Balance At Subduction Zonescontrasting

confidence: 37%

“…Because postulated mantle 10 Be contents are low, any enrichments observed in erupted arc lavas are indicative of contributions from recently subducted sediment. Likewise, Ba/La ratios, often used to trace a slab-derived £uid phase, are high in Nicaragua and low in Costa Rica [4,5]. Additionally, low La/Yb ratios, generally attributed to high degrees of partial melting, are found in Nicaragua [4].…”

Section: Geologic Setting and Backgroundmentioning

confidence: 99%

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Contrasting He–C relationships in Nicaragua and Costa Rica: insights into C cycling through subduction zones

Shaw

Hilton

Fischer

et al. 2003

Earth and Planetary Science Letters

166

160

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We report 3 He/ 4 He ratios, relative He, Ne, and CO 2 abundances as well as N 13 C values for volatiles from the volcanic output along the Costa Rica and Nicaragua segments of the Central American arc utilising fumaroles, geothermal wells, water springs and bubbling hot springs. CO 2 / 3 He ratios are relatively constant throughout Costa Rica (av. 2.1U10 10 ) and Nicaragua (av. 2.5U10 10 ) and similar to arcs worldwide (V1.5U10 10 ). N 13 C values range from 36.8x (MORB-like) to 30.1x (similar to marine carbonate (0x)). 3 He/ 4 He ratios are essentially MORBlike (8 þ 1 R A ) with some samples showing evidence of crustal He additions^water spring samples are particularly susceptible to modification. The He^CO 2 relationships are consistent with an enhanced input of slab-derived C to magma sources in Nicaragua ((L+S)/M = 16; where L, M and S represent the fraction of CO 2 derived from limestone and/or marine carbonate (L), the mantle (M) and sedimentary organic C (S) sources) relative to Costa Rica ((L+S)/ M = 10). This is consistent with prior studies showing a higher sedimentary flux to the arc volcanics in Nicaragua (as traced by Ba/La, 10 Be and La/Yb). Possible explanations include: (1) offscraping of the uppermost sediments in the Costa Rica forearc, and (2) a cooler thermal regime in the Nicaragua subduction zone, preserving a higher proportion of melt-inducing fluids to subarc depths, leading to a higher degree of sediment transfer to the subarc mantle. The absolute flux of CO 2 from the Central American arc as determined by correlation spectrometry methods (5.8U10 10 mol/yr) and CO 2 / 3 He ratios (7.1U10 10 mol/yr) represents approximately 14^18% of the amount of CO 2 input at the trench from the various slab contributors (carbonate sediments, organic C, and altered oceanic crust). Although the absolute flux is comparable to other arcs, the efficiency of CO 2 recycling through the Central American arc is surprisingly low (14^18% vs. a global average of V50%). This may be attributed to either significant C loss in the forearc region, or incomplete decarbonation of carbonate sediments at subarc depths. The implication of the latter case is that a large fraction of C (up to 86%) may be transferred to the deep mantle (depths beyond the source of arc magmas). ß

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Section: Sources Of Cosupporting

confidence: 90%

Section: Mass Balance At Subduction Zonessupporting

confidence: 78%

Section: Mass Balance At Subduction Zonescontrasting

confidence: 37%

Section: Geologic Setting and Backgroundmentioning

confidence: 99%

See 2 more Smart Citations

Contrasting He–C relationships in Nicaragua and Costa Rica: insights into C cycling through subduction zones

Shaw

Hilton

Fischer

et al. 2003

Earth and Planetary Science Letters

166

160

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“…As already shown in Figure 2, limestone was by far the most abundant crustal carbon source (from 85 to 87%), with variable contribution from organic-rich sediments (from 1.8 to 14%). As already reported by Shaw et al (2003) on the basis of the CO 2 -He systematics of various thermal fluid discharges from volcanoes and geothermal systems in the Costa Rica and Nicaragua regions including Rincón de la Vieja and Miravalles volcanoes, the fluids from the study area were characterized by a relatively high L/S average ratio (21.7), i.e., strongly higher than the worldwide arc L/S average value (6.0 ± 0.38; Sano and Williams, 1996), possibly due to the carbonate-rich composition of the Cocos Plate subducting sedimentary material (Patino et al, 2000;Saginor et al, 2013). Similar features were also observed in fluids from the Chilean Southern and Central Volcanic Zones (CVZ and SVZ) (Ray et al, 2009;Benavente et al, 2013Benavente et al, , 2016.…”

Section: Discussion Gas Sources and Secondary Chemical-physical Procementioning

confidence: 88%

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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Large volume submarine ignimbrites in the Shikoku Basin: An example for explosive volcanism in the Western Pacific during the Late Miocene

Kutterolf

Schindlbeck

Scudder

et al. 2014

Geochem Geophys Geosyst

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During IODP Expedition 322, an interval of Late Miocene (7.6 to 9.1 Ma) tuffaceous and volcaniclastic sandstones was discovered in the Shikoku Basin (Site C0011B), Nankai region. This interval consists of bioturbated silty claystone including four 1-7 m thick interbeds of tuffaceous sandstones (TST) containing 57-82% (by volume) pyroclasts. We use major and trace element glass compositions, as well as radiogenic isotope compositions, to show that the tuffaceous sandstones beds derived from single eruptive events, and that the majority (TST 1, 2, 3a) came from different eruptions from a similar source region, which we have identified to be the Japanese mainland, 350 km away. In particular, diagnostic trace element ratios (e.g., Th/La, Sm/La, Rb/Hf, Th/Nb, and U/Th) and isotopic data indicate a marked contribution from a mantle source beneath continental crust, which is most consistent with a Japanese mainland source and likely excludes the Izu-Bonin island arc and back arc as a source region for the younger TST beds. Nevertheless, some of the chemical data measured on the oldest sandstone bed (TST 3b, Unit IIb) show affinity to or can clearly be attributed to an Izu-Bonin composition. While we cannot completely exclude the possibility that all TST beds derived from unknown and exotic Izu-Bonin source(s), the collected lines of evidence are most consistent with an origin from the paleo-Honshu arc for TST 1 through 3a. We therefore suggest the former collision zone between the Izu-Bonin arc and Honshu paleo-arc as the most likely region where the eruptive products entered the ocean, also concurrent with nearby (200 km) possible Miocene source areas for the tuffaceous sandstones at the paleo-NE-Honshu arc. Estimating the distribution area of the tuffaceous sandstones in the Miocene between this source region and the 350 km distant Expedition 322, using bathymetric constraints, we calculate that the sandstone beds represent minimum erupted magma volumes between 1 and 17 km 3 (Dense Rock Equivalent (DRE)). We conclude that several large volume eruptions occurred during the Late Miocene time next to the collision zone of paleo-Honshu and Izu-Bonin arc and covered the entire Philippine Sea plate with meter thick, sheet-like pyroclastic deposits that are now subducted in the Nankai subduction zone.

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Local and regional variations in Central American arc lavas controlled by variations in subducted sediment input

Cited by 295 publications

References 59 publications

Contrasting He–C relationships in Nicaragua and Costa Rica: insights into C cycling through subduction zones

Contrasting He–C relationships in Nicaragua and Costa Rica: insights into C cycling through subduction zones

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

Large volume submarine ignimbrites in the Shikoku Basin: An example for explosive volcanism in the Western Pacific during the Late Miocene

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