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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/18478
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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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1844614424421203968 |
score |
13.070432 |