The Western Sierras Pampeanas: Protracted Grenville-age history (1330-1030 Ma) of intra-oceanic arcs, subduction-accretion at continental-edge and AMCG intraplate magmatism
- Autores
- Rapela, Carlos Washington; Pankhurst, Robert J.; Casquet, César; Baldo, Edgardo G.; Galindo, Carmen; Fanning, Christopher; Dahlquist, Juan A.
- Año de publicación
- 2010
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- New U–Pb SHRIMP zircon ages combined with geochemical and isotope investigation in the Sierra de; Maz and Sierra de Pie de Palo and a xenolith of the Precordillera basement (Ullun), provides insight into; the identification of major Grenville-age tectonomagmatic events and their timing in the Western Sierras; Pampeanas. The study reveals two contrasting scenarios that evolved separately during the 300 Ma long; history: Sierra de Maz, which was always part of a continental crust, and the juvenile oceanic arc and; back-arc sector of Sierra de Pie de Palo and Ullun. The oldest rocks are the Andino-type granitic orthogneisses; of Sierra de Maz (1330–1260 Ma) and associated subalkaline basic rocks, that were part of an; active continental margin developed in a Paleoproterozoic crust. Amphibolite facies metamorphism; affected the orthogneisses at ca. 1175 Ma, while granulite facies was attained in neighbouring meta-sediments; and basic granulites. Interruption of continental-edge magmatism and high-grade metamorphism; is interpreted as related to an arc–continental collision dated by zircon overgrowths at 1170–1230 Ma.; The next event consisted of massif-type anorthosites and related meta-jotunites, meta-mangerites; (1092 ± 6 Ma) and meta-granites (1086 ± 10 Ma) that define an AMCG complex in Sierra de Maz. The; emplacement of these mantle-derived magmas during an extensional episode produced a widespread; thermal overprint at ca. 1095 Ma in neighbouring country rocks. In constrast, juvenile oceanic arc and; back-arc complexes dominated the Sierra de Pie de Palo–Ullun sector, that was fully developed ca.; 1200 Ma (1196 ± 8 Ma metagabbro). A new episode of oceanic arc magmatism at 1165 Ma was roughly; coeval with the amphibolite high-grade metamorphism of Sierra de Maz, indicating that these two sectors; underwent independent geodynamic scenarios at this age. Two more episodes of arc subduction are; registered in the Pie de Palo–Ullun sector: (i) 1110 ± 10 Ma orthogneisses and basic amphibolites with; geochemical fingerprints of emplacement in a more mature crust, and (ii) a 1027 ± 17 Ma TTG juvenile; suite, which is the youngest Grenville-age magmatic event registered in the Western Sierras Pampeanas.; The geodynamic history in both study areas reveals a complex orogenic evolution, dominated by convergent; tectonics and accretion of juvenile oceanic arcs to the continent.
Centro de Investigaciones Geológicas - Materia
-
Geología
Sierras Pampeanas
Grenville-age orogeny
Intra-oceanic arc
Arc–continent collision
AMCG complex
U–Pb SHRIMP dating - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/128518
Ver los metadatos del registro completo
id |
SEDICI_4251831628357a8c9f319dee94a14643 |
---|---|
oai_identifier_str |
oai:sedici.unlp.edu.ar:10915/128518 |
network_acronym_str |
SEDICI |
repository_id_str |
1329 |
network_name_str |
SEDICI (UNLP) |
spelling |
The Western Sierras Pampeanas: Protracted Grenville-age history (1330-1030 Ma) of intra-oceanic arcs, subduction-accretion at continental-edge and AMCG intraplate magmatismRapela, Carlos WashingtonPankhurst, Robert J.Casquet, CésarBaldo, Edgardo G.Galindo, CarmenFanning, ChristopherDahlquist, Juan A.GeologíaSierras PampeanasGrenville-age orogenyIntra-oceanic arcArc–continent collisionAMCG complexU–Pb SHRIMP datingNew U–Pb SHRIMP zircon ages combined with geochemical and isotope investigation in the Sierra de; Maz and Sierra de Pie de Palo and a xenolith of the Precordillera basement (Ullun), provides insight into; the identification of major Grenville-age tectonomagmatic events and their timing in the Western Sierras; Pampeanas. The study reveals two contrasting scenarios that evolved separately during the 300 Ma long; history: Sierra de Maz, which was always part of a continental crust, and the juvenile oceanic arc and; back-arc sector of Sierra de Pie de Palo and Ullun. The oldest rocks are the Andino-type granitic orthogneisses; of Sierra de Maz (1330–1260 Ma) and associated subalkaline basic rocks, that were part of an; active continental margin developed in a Paleoproterozoic crust. Amphibolite facies metamorphism; affected the orthogneisses at ca. 1175 Ma, while granulite facies was attained in neighbouring meta-sediments; and basic granulites. Interruption of continental-edge magmatism and high-grade metamorphism; is interpreted as related to an arc–continental collision dated by zircon overgrowths at 1170–1230 Ma.; The next event consisted of massif-type anorthosites and related meta-jotunites, meta-mangerites; (1092 ± 6 Ma) and meta-granites (1086 ± 10 Ma) that define an AMCG complex in Sierra de Maz. The; emplacement of these mantle-derived magmas during an extensional episode produced a widespread; thermal overprint at ca. 1095 Ma in neighbouring country rocks. In constrast, juvenile oceanic arc and; back-arc complexes dominated the Sierra de Pie de Palo–Ullun sector, that was fully developed ca.; 1200 Ma (1196 ± 8 Ma metagabbro). A new episode of oceanic arc magmatism at 1165 Ma was roughly; coeval with the amphibolite high-grade metamorphism of Sierra de Maz, indicating that these two sectors; underwent independent geodynamic scenarios at this age. Two more episodes of arc subduction are; registered in the Pie de Palo–Ullun sector: (i) 1110 ± 10 Ma orthogneisses and basic amphibolites with; geochemical fingerprints of emplacement in a more mature crust, and (ii) a 1027 ± 17 Ma TTG juvenile; suite, which is the youngest Grenville-age magmatic event registered in the Western Sierras Pampeanas.; The geodynamic history in both study areas reveals a complex orogenic evolution, dominated by convergent; tectonics and accretion of juvenile oceanic arcs to the continent.Centro de Investigaciones Geológicas2010info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf105-127http://sedici.unlp.edu.ar/handle/10915/128518enginfo:eu-repo/semantics/altIdentifier/issn/0895-9811info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2009.08.004info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:31:07Zoai:sedici.unlp.edu.ar:10915/128518Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:31:08.013SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
The Western Sierras Pampeanas: Protracted Grenville-age history (1330-1030 Ma) of intra-oceanic arcs, subduction-accretion at continental-edge and AMCG intraplate magmatism |
title |
The Western Sierras Pampeanas: Protracted Grenville-age history (1330-1030 Ma) of intra-oceanic arcs, subduction-accretion at continental-edge and AMCG intraplate magmatism |
spellingShingle |
The Western Sierras Pampeanas: Protracted Grenville-age history (1330-1030 Ma) of intra-oceanic arcs, subduction-accretion at continental-edge and AMCG intraplate magmatism Rapela, Carlos Washington Geología Sierras Pampeanas Grenville-age orogeny Intra-oceanic arc Arc–continent collision AMCG complex U–Pb SHRIMP dating |
title_short |
The Western Sierras Pampeanas: Protracted Grenville-age history (1330-1030 Ma) of intra-oceanic arcs, subduction-accretion at continental-edge and AMCG intraplate magmatism |
title_full |
The Western Sierras Pampeanas: Protracted Grenville-age history (1330-1030 Ma) of intra-oceanic arcs, subduction-accretion at continental-edge and AMCG intraplate magmatism |
title_fullStr |
The Western Sierras Pampeanas: Protracted Grenville-age history (1330-1030 Ma) of intra-oceanic arcs, subduction-accretion at continental-edge and AMCG intraplate magmatism |
title_full_unstemmed |
The Western Sierras Pampeanas: Protracted Grenville-age history (1330-1030 Ma) of intra-oceanic arcs, subduction-accretion at continental-edge and AMCG intraplate magmatism |
title_sort |
The Western Sierras Pampeanas: Protracted Grenville-age history (1330-1030 Ma) of intra-oceanic arcs, subduction-accretion at continental-edge and AMCG intraplate magmatism |
dc.creator.none.fl_str_mv |
Rapela, Carlos Washington Pankhurst, Robert J. Casquet, César Baldo, Edgardo G. Galindo, Carmen Fanning, Christopher Dahlquist, Juan A. |
author |
Rapela, Carlos Washington |
author_facet |
Rapela, Carlos Washington Pankhurst, Robert J. Casquet, César Baldo, Edgardo G. Galindo, Carmen Fanning, Christopher Dahlquist, Juan A. |
author_role |
author |
author2 |
Pankhurst, Robert J. Casquet, César Baldo, Edgardo G. Galindo, Carmen Fanning, Christopher Dahlquist, Juan A. |
author2_role |
author author author author author author |
dc.subject.none.fl_str_mv |
Geología Sierras Pampeanas Grenville-age orogeny Intra-oceanic arc Arc–continent collision AMCG complex U–Pb SHRIMP dating |
topic |
Geología Sierras Pampeanas Grenville-age orogeny Intra-oceanic arc Arc–continent collision AMCG complex U–Pb SHRIMP dating |
dc.description.none.fl_txt_mv |
New U–Pb SHRIMP zircon ages combined with geochemical and isotope investigation in the Sierra de; Maz and Sierra de Pie de Palo and a xenolith of the Precordillera basement (Ullun), provides insight into; the identification of major Grenville-age tectonomagmatic events and their timing in the Western Sierras; Pampeanas. The study reveals two contrasting scenarios that evolved separately during the 300 Ma long; history: Sierra de Maz, which was always part of a continental crust, and the juvenile oceanic arc and; back-arc sector of Sierra de Pie de Palo and Ullun. The oldest rocks are the Andino-type granitic orthogneisses; of Sierra de Maz (1330–1260 Ma) and associated subalkaline basic rocks, that were part of an; active continental margin developed in a Paleoproterozoic crust. Amphibolite facies metamorphism; affected the orthogneisses at ca. 1175 Ma, while granulite facies was attained in neighbouring meta-sediments; and basic granulites. Interruption of continental-edge magmatism and high-grade metamorphism; is interpreted as related to an arc–continental collision dated by zircon overgrowths at 1170–1230 Ma.; The next event consisted of massif-type anorthosites and related meta-jotunites, meta-mangerites; (1092 ± 6 Ma) and meta-granites (1086 ± 10 Ma) that define an AMCG complex in Sierra de Maz. The; emplacement of these mantle-derived magmas during an extensional episode produced a widespread; thermal overprint at ca. 1095 Ma in neighbouring country rocks. In constrast, juvenile oceanic arc and; back-arc complexes dominated the Sierra de Pie de Palo–Ullun sector, that was fully developed ca.; 1200 Ma (1196 ± 8 Ma metagabbro). A new episode of oceanic arc magmatism at 1165 Ma was roughly; coeval with the amphibolite high-grade metamorphism of Sierra de Maz, indicating that these two sectors; underwent independent geodynamic scenarios at this age. Two more episodes of arc subduction are; registered in the Pie de Palo–Ullun sector: (i) 1110 ± 10 Ma orthogneisses and basic amphibolites with; geochemical fingerprints of emplacement in a more mature crust, and (ii) a 1027 ± 17 Ma TTG juvenile; suite, which is the youngest Grenville-age magmatic event registered in the Western Sierras Pampeanas.; The geodynamic history in both study areas reveals a complex orogenic evolution, dominated by convergent; tectonics and accretion of juvenile oceanic arcs to the continent. Centro de Investigaciones Geológicas |
description |
New U–Pb SHRIMP zircon ages combined with geochemical and isotope investigation in the Sierra de; Maz and Sierra de Pie de Palo and a xenolith of the Precordillera basement (Ullun), provides insight into; the identification of major Grenville-age tectonomagmatic events and their timing in the Western Sierras; Pampeanas. The study reveals two contrasting scenarios that evolved separately during the 300 Ma long; history: Sierra de Maz, which was always part of a continental crust, and the juvenile oceanic arc and; back-arc sector of Sierra de Pie de Palo and Ullun. The oldest rocks are the Andino-type granitic orthogneisses; of Sierra de Maz (1330–1260 Ma) and associated subalkaline basic rocks, that were part of an; active continental margin developed in a Paleoproterozoic crust. Amphibolite facies metamorphism; affected the orthogneisses at ca. 1175 Ma, while granulite facies was attained in neighbouring meta-sediments; and basic granulites. Interruption of continental-edge magmatism and high-grade metamorphism; is interpreted as related to an arc–continental collision dated by zircon overgrowths at 1170–1230 Ma.; The next event consisted of massif-type anorthosites and related meta-jotunites, meta-mangerites; (1092 ± 6 Ma) and meta-granites (1086 ± 10 Ma) that define an AMCG complex in Sierra de Maz. The; emplacement of these mantle-derived magmas during an extensional episode produced a widespread; thermal overprint at ca. 1095 Ma in neighbouring country rocks. In constrast, juvenile oceanic arc and; back-arc complexes dominated the Sierra de Pie de Palo–Ullun sector, that was fully developed ca.; 1200 Ma (1196 ± 8 Ma metagabbro). A new episode of oceanic arc magmatism at 1165 Ma was roughly; coeval with the amphibolite high-grade metamorphism of Sierra de Maz, indicating that these two sectors; underwent independent geodynamic scenarios at this age. Two more episodes of arc subduction are; registered in the Pie de Palo–Ullun sector: (i) 1110 ± 10 Ma orthogneisses and basic amphibolites with; geochemical fingerprints of emplacement in a more mature crust, and (ii) a 1027 ± 17 Ma TTG juvenile; suite, which is the youngest Grenville-age magmatic event registered in the Western Sierras Pampeanas.; The geodynamic history in both study areas reveals a complex orogenic evolution, dominated by convergent; tectonics and accretion of juvenile oceanic arcs to the continent. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo 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://sedici.unlp.edu.ar/handle/10915/128518 |
url |
http://sedici.unlp.edu.ar/handle/10915/128518 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/issn/0895-9811 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2009.08.004 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
dc.format.none.fl_str_mv |
application/pdf 105-127 |
dc.source.none.fl_str_mv |
reponame:SEDICI (UNLP) instname:Universidad Nacional de La Plata instacron:UNLP |
reponame_str |
SEDICI (UNLP) |
collection |
SEDICI (UNLP) |
instname_str |
Universidad Nacional de La Plata |
instacron_str |
UNLP |
institution |
UNLP |
repository.name.fl_str_mv |
SEDICI (UNLP) - Universidad Nacional de La Plata |
repository.mail.fl_str_mv |
alira@sedici.unlp.edu.ar |
_version_ |
1844616191248695296 |
score |
13.070432 |