Temporal variations in the influence of the subducting slab on Central Andean arc magmas: Evidence from boron isotope systematics

Autores
Jones, Rosemary E.; de Hoog, Jan C. M.; Kirstein, Linda A.; Kasemann, Simone A.; Hinton, Richard; Elliott, Tim; Litvak, Vanesa Dafne; Edinburgh Ion Microprobe Facility
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
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.
Fil: Jones, Rosemary E.. University of Edinburgh; Reino Unido
Fil: de Hoog, Jan C. M.. University of Edinburgh; Reino Unido
Fil: Kirstein, Linda A.. University of Edinburgh; Reino Unido
Fil: Kasemann, Simone A.. Universitat Bremen; Alemania
Fil: Hinton, Richard. University of Edinburgh; Reino Unido
Fil: Elliott, Tim. University of Bristol; Reino Unido
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
Fil: Edinburgh Ion Microprobe Facility. University of Edinburgh; Reino Unido
Materia
Boron isotopes
Melt inclusions
Subduction zone
Southern Central Andes
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/18478

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oai_identifier_str oai:ri.conicet.gov.ar:11336/18478
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Temporal variations in the influence of the subducting slab on Central Andean arc magmas: Evidence from boron isotope systematicsJones, Rosemary E.de Hoog, Jan C. M.Kirstein, Linda A.Kasemann, Simone A.Hinton, RichardElliott, TimLitvak, Vanesa DafneEdinburgh Ion Microprobe FacilityBoron isotopesMelt inclusionsSubduction zoneSouthern Central Andeshttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The 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.Fil: Jones, Rosemary E.. University of Edinburgh; Reino UnidoFil: de Hoog, Jan C. M.. University of Edinburgh; Reino UnidoFil: Kirstein, Linda A.. University of Edinburgh; Reino UnidoFil: Kasemann, Simone A.. Universitat Bremen; AlemaniaFil: Hinton, Richard. University of Edinburgh; Reino UnidoFil: Elliott, Tim. University of Bristol; Reino UnidoFil: 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 ; ArgentinaFil: Edinburgh Ion Microprobe Facility. University of Edinburgh; Reino UnidoElsevier Science2014-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/18478Jones, 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; 390-4010012-821XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2014.10.004info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0012821X14006220info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:39:49Zoai:ri.conicet.gov.ar:11336/18478instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:39:49.69CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Temporal variations in the influence of the subducting slab on Central Andean arc magmas: Evidence from boron isotope systematics
title Temporal variations in the influence of the subducting slab on Central Andean arc magmas: Evidence from boron isotope systematics
spellingShingle Temporal variations in the influence of the subducting slab on Central Andean arc magmas: Evidence from boron isotope systematics
Jones, Rosemary E.
Boron isotopes
Melt inclusions
Subduction zone
Southern Central Andes
title_short Temporal variations in the influence of the subducting slab on Central Andean arc magmas: Evidence from boron isotope systematics
title_full Temporal variations in the influence of the subducting slab on Central Andean arc magmas: Evidence from boron isotope systematics
title_fullStr Temporal variations in the influence of the subducting slab on Central Andean arc magmas: Evidence from boron isotope systematics
title_full_unstemmed Temporal variations in the influence of the subducting slab on Central Andean arc magmas: Evidence from boron isotope systematics
title_sort Temporal variations in the influence of the subducting slab on Central Andean arc magmas: Evidence from boron isotope systematics
dc.creator.none.fl_str_mv Jones, Rosemary E.
de Hoog, Jan C. M.
Kirstein, Linda A.
Kasemann, Simone A.
Hinton, Richard
Elliott, Tim
Litvak, Vanesa Dafne
Edinburgh Ion Microprobe Facility
author Jones, Rosemary E.
author_facet Jones, Rosemary E.
de Hoog, Jan C. M.
Kirstein, Linda A.
Kasemann, Simone A.
Hinton, Richard
Elliott, Tim
Litvak, Vanesa Dafne
Edinburgh Ion Microprobe Facility
author_role author
author2 de Hoog, Jan C. M.
Kirstein, Linda A.
Kasemann, Simone A.
Hinton, Richard
Elliott, Tim
Litvak, Vanesa Dafne
Edinburgh Ion Microprobe Facility
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Boron isotopes
Melt inclusions
Subduction zone
Southern Central Andes
topic Boron isotopes
Melt inclusions
Subduction zone
Southern Central Andes
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv 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.
Fil: Jones, Rosemary E.. University of Edinburgh; Reino Unido
Fil: de Hoog, Jan C. M.. University of Edinburgh; Reino Unido
Fil: Kirstein, Linda A.. University of Edinburgh; Reino Unido
Fil: Kasemann, Simone A.. Universitat Bremen; Alemania
Fil: Hinton, Richard. University of Edinburgh; Reino Unido
Fil: Elliott, Tim. University of Bristol; Reino Unido
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
Fil: Edinburgh Ion Microprobe Facility. University of Edinburgh; Reino Unido
description 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.
publishDate 2014
dc.date.none.fl_str_mv 2014-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/18478
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
0012-821X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/18478
identifier_str_mv 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
0012-821X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2014.10.004
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0012821X14006220
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432