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dc.contributor.author
Jones, Rosemary E.  
dc.contributor.author
de Hoog, Jan C. M.  
dc.contributor.author
Kirstein, Linda A.  
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Kasemann, Simone A.  
dc.contributor.author
Hinton, Richard  
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Elliott, Tim  
dc.contributor.author
Litvak, Vanesa Dafne  
dc.contributor.author
Edinburgh Ion Microprobe Facility  
dc.date.available
2017-06-19T20:19:57Z  
dc.date.issued
2014-12  
dc.identifier.citation
Jones, Rosemary E.; de Hoog, Jan C. M.; Kirstein, Linda A.; Kasemann, Simone A.; Hinton, Richard; et al.; Temporal variations in the influence of the subducting slab on Central Andean arc magmas: Evidence from boron isotope systematics; Elsevier Science; Earth And Planetary Science Letters; 408; 12-2014; 390-401  
dc.identifier.issn
0012-821X  
dc.identifier.uri
http://hdl.handle.net/11336/18478  
dc.description.abstract
The Pampean flat-slab segment in the southern Central Andes represents an ideal setting at which to investigate how changes in the tectonic configuration of a subduction zone (convergence angles and rates, seamount subduction and shallowing slab angle) affects the recycling of subducted components to arc magmas. To constrain sources, particularly of slab-derived fluids and their contribution to arc magmatism, boron isotope and select major and trace element compositions were determined for pyroxene- and zircon-hosted melt inclusions obtained from a suite of Paleocene to Miocene arc magmatic rocks, from the southern Central Andes. Considerable changes in δ11B values and boron concentrations are observed with time. Significantly lower δ11B values (average = −1.9 ± 2.2% (1σ)) and B/Nb ratios (average = 3.3 ± 1.3 (1σ)) were obtained for melt inclusions from Oligocene arc rocks (∼ 24 Ma) compared to those from the Paleocene (∼ 61 Ma) (averages = +1.6 ± 0.8% and 17.8 ± 1.4 (1σ), respectively) and the Miocene (∼18 Ma) (averages = +4.7 ± 1.9% and 11.9 ± 5.5 (1σ), respectively). A slab-derived fluid with a δ11B composition of +1.5%, primarily derived from altered oceanic crust on the down-going slab, affected the source of the Paleocene arc magma. The source of the Oligocene arc magmas received less boron derived from the subducting slab (1% fluid addition) than the Paleocene and Miocene arc magmas (up to 3.5% fluid addition). This is consistent with a greater depth to the slabmantle interface and is potentially related to the widening of the volcanic arc and more distal position of these samples relative to the trench during this time period. The higher δ11B values (up to ∼9%) obtained for the Miocene melt inclusions record an increase in the influence of serpentinite-derived fluids on the source of arc magmas after ∼19.5 Ma. This is approximately coeval with the subduction of the Juan Fernandez Ridge (JFR), suggesting that the oceanic lithosphere associated with the subducting JFR in the Early Miocene was hydrated and serpentinised, similar to the present day ridge. As serpentinisation increases the buoyancy of the slab this finding supports the link between the intersection of the JFR with the Andean margin and the onset of flat-slab subduction.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Elsevier Science  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/  
dc.subject
Boron Isotopes  
dc.subject
Melt Inclusions  
dc.subject
Subduction Zone  
dc.subject
Southern Central Andes  
dc.subject.classification
Geoquímica y Geofísica  
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Ciencias de la Tierra y relacionadas con el Medio Ambiente  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Temporal variations in the influence of the subducting slab on Central Andean arc magmas: Evidence from boron isotope systematics  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2017-06-19T17:26:44Z  
dc.journal.volume
408  
dc.journal.pagination
390-401  
dc.journal.pais
Países Bajos  
dc.journal.ciudad
Amsterdam  
dc.description.fil
Fil: Jones, Rosemary E.. University of Edinburgh; Reino Unido  
dc.description.fil
Fil: de Hoog, Jan C. M.. University of Edinburgh; Reino Unido  
dc.description.fil
Fil: Kirstein, Linda A.. University of Edinburgh; Reino Unido  
dc.description.fil
Fil: Kasemann, Simone A.. Universitat Bremen; Alemania  
dc.description.fil
Fil: Hinton, Richard. University of Edinburgh; Reino Unido  
dc.description.fil
Fil: Elliott, Tim. University of Bristol; Reino Unido  
dc.description.fil
Fil: Litvak, Vanesa Dafne. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos ; Argentina  
dc.description.fil
Fil: Edinburgh Ion Microprobe Facility. University of Edinburgh; Reino Unido  
dc.journal.title
Earth And Planetary Science Letters  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.epsl.2014.10.004  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0012821X14006220