<scp>RU</scp>_<scp>CAG</scp>eochem, a database and sample repository for Central American volcanic rocks at Rutgers University

Carr, Michael J.; Feigenson, Mark D.; Bolge, Louise; Walker, James A.; Gazel, Esteban

doi:10.1002/gdj3.10

Cited by 25 publications

(29 citation statements)

References 39 publications

(47 reference statements)

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“…8b). However, only one of these three samples has been analyzed for 10 Be and was 609 found to be fairly low (Carr et al, 2014) and there is, therefore, no direct correlation between 610 28 parameters need not be apparent because 10 Be is high only in the youngest sediments, while Tl 612 isotopes are likely heavy throughout the hemipelagic clays. 613…”

Section: Compositions 605mentioning

confidence: 99%

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Thallium isotopes as tracers of recycled materials in subduction zones: Review and new data for lavas from Tonga-Kermadec and Central America

Nielsen

Prytulak

Blusztajn

et al. 2017

Journal of Volcanology and Geothermal Research

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-Sediment is actively being subducted in every convergent margin worldwide. 18Yet, geochemical data for arc lavas from several subduction zones, such as Northern Tonga and 19 Costa Rica have revealed either attenuated or limited evidence for sediment in their mantle 20 source regions. Here we use thallium (Tl) isotopes to trace slab components in lavas from the 21 Tonga-Kermadec and Central American arcs. In general, both arcs display Tl isotope data that 22 are most compatible with addition of sediment to the sub-arc mantle from the subducting slab. and Central American arcs demonstrate that pelagic sediments are detectable in most arcs, 38 whereas altered oceanic crust components only become appreciable when sediment Tl 39 concentrations are very low (e.g. carbonate) or if sediments are no longer a significant 40 3 component of the subducting slab (e.g. slab melting in Western Aleutians). As such, Tl isotopes 41 is a promising tool to trace sediment subduction although this requires at least some pelagic 42 sediment is present in the subducted sediment package. 43We suggest that thallium partitioning between the slab and mantle wedge is most likely 44 controlled by retention in phengite or by partitioning into fluids. Residual phengite likely 45 produces high Cs/Tl ratios because Tl should be more compatible in phengite than is Cs, 46 however, this conclusion needs experimental verification. The stability of phengite is lower at 47 higher fluid contents, which results in hyperbolic relationships between Cs/Tl and possible 48indicators of fluids such as Sr/Nd and Ba/Th. Thus, combined Tl isotopic and elemental 49 systematics not only provide detailed information about the specific slab components that 50 contribute to arc lavas, but also potentially shed light on the mineralogy and physical conditions 51 of subducting slabs. 52 53

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Section: Compositions 605mentioning

confidence: 99%

“…Major and trace elements and isotope ratios for these samples can be found in (Carr et al, 2014) 1241…”

mentioning

confidence: 99%

Thallium isotopes as tracers of recycled materials in subduction zones: Review and new data for lavas from Tonga-Kermadec and Central America

Nielsen

Prytulak

Blusztajn

et al. 2017

Journal of Volcanology and Geothermal Research

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“…Evolution for key trace elements (Ba, La, U, and Th) in Costa Rica (blue) and Nicaragua (red) in the last 30 Ma [data from Plank et al ., ; Carr et al ., ; Gazel et al ., ; Saginor et al ., ; Carr et al ., ]. Note how the Ba/La and U/Th ratios, used to trace the sediment component, clearly changed after 10 Ma, separating the trends of Costa Rica and Nicaragua.…”

Section: Discussionmentioning

confidence: 99%

Evolution of geochemical variations along the Central American volcanic front

Saginor

Gazel

Condie

et al. 2013

Geochem Geophys Geosyst

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[1] New geochemical analyses of volcanic rocks in El Salvador add to existing data from Nicaragua and Costa Rica to create a comprehensive set of geochemical data for Central American volcanics. These data coupled with previously published 40 Ar/ 39Ar ages covering the past 30 Ma show that Costa Rica and Nicaragua had similar U/Th and Ba/La values until 10 Ma when the region developed the distinctive along arc variations that made this margin famous. U/Th values increased in Nicaragua since the Miocene, while remaining unchanged along the rest of the volcanic front. This coincides temporally with the Carbonate Crash, which caused a transition in Cocos plate sediments from low-U carbonates to high-U, organic rich hemipelagic muds. Increases in uranium are not observed in Costa Rica because its lower slab dip produces a more diffuse zone of partial melting and because of the contribution from Galapagosderived tracks dilutes this signal. Ba/La has been used as a geochemical proxy for contributions from the subducting slab; however, our analyses indicate that the Ba concentrations do not vary significantly along strike either in the subducting sediment or the volcanic front. Along-arc variation is controlled by changes in La, an indicator of the degree of partial melting or source enrichment. Trace element models of five segments of the volcanic front suggest that a subducting sediment component is more important to magmas produced in El Salvador and Nicaragua than in Costa Rica, where the geochemistry is controlled by recent (<10 Ma) recycling of Galapagos tracks.

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“…An intraplate input can occur when the eruptive products of a mantle plume (e.g., ridges and seamount tracks) get recycled in a subduction system . Samples from this study and additional data compiled from literature (Abratis, 1998;Ballmann, 1976;Bolge et al, 2009;Carr et al, 2014;Drummond et al, 1995;Gräfe, 1998;Gazel et al, 2009;Jackson, 1991;Tournon, 1984). Average upper continental crust from Rudnick and Gao (2003) and average sodic (Na) and potassic (K) TTG from Moyen (2011).…”

Section: 1029/2018gc008128mentioning

confidence: 99%

“…After replacing the composition from altered MORB slab to the average subducting Cocos Ridge for samples 11-5 Ma and the average Seamount Province for samples <5 Ma, successful results were reached in the first tens of simulations. Additional data compiled from Drummond et al (1995), Gräfe (1998), Abratis (1998), Gazel et al (2009), Bolge et al (2009), and Carr et al (2014. While the samples >12 Ma can be reproduced with a subduction component composed of an altered MORB slab and sediments and do not require a Galapagos track component.…”

Section: 1029/2018gc008128mentioning

confidence: 99%

The Record of the Transition From an Oceanic Arc to a Young Continent in the Talamanca Cordillera

Gazel

Hayes

Ulloa

et al. 2019

Geochem Geophys Geosyst

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The Talamanca Cordillera in the Central America Arc (Costa Rica‐Panama) preserves the record of the geochemical evolution from an intraoceanic arc to a juvenile continental arc in an active subduction zone, making it a testbed to explore processes that resulted in juvenile continental crust formation and explore potential mechanisms of early continental crust generation. Here we present a comprehensive set of geochronological, geochemical, and petrological data from the Talamanca Cordillera that tracks the key turning point (12–8 Ma) from the evolution of an oceanic arc depleted in incompatible elements to a juvenile continent. Most plutonic rocks from this transition and postintrusive rocks share striking similarities with average upper continental crust and Archean tonalite, trondhjemite, and granodiorite. We complement these data with seismic studies across the arc. Seismic velocities within the Caribbean Plate (basement of the arc) show a relatively uniform lateral structure consistent with a thick mafic large igneous province. Comparisons of seismic velocity profiles in the middle and lower crust beneath the active arc and remnant Miocene arc suggest a transition toward more felsic compositions as the volcanic center migrated toward the location of the modern arc. Seismic velocities along the modern arc in Costa Rica compared with other active arcs and average continental crust suggest an intermediate composition beneath the active arc in Costa Rica closer to average crust. Our geochemical modeling and radiogenic isotopes systematics suggest that input components from melting of the subducting Galapagos hotspot tracks are required for this compositional change.

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RU_CAGeochem, a database and sample repository for Central American volcanic rocks at Rutgers University

Cited by 25 publications

References 39 publications

Thallium isotopes as tracers of recycled materials in subduction zones: Review and new data for lavas from Tonga-Kermadec and Central America

Thallium isotopes as tracers of recycled materials in subduction zones: Review and new data for lavas from Tonga-Kermadec and Central America

Evolution of geochemical variations along the Central American volcanic front

The Record of the Transition From an Oceanic Arc to a Young Continent in the Talamanca Cordillera

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