Post-collisional lamprophyric event in Sierra Norte, Córdoba, Argentina: Mineralogical, geochemical and isotopic characteristics
- Autores
- O'Leary, M. S.; Lira, Raul; Dorais, M. J.; Tassinari, C. C. G.
- Año de publicación
- 2009
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Over 20 lamprophyre dykes, varying in width between a few centimeters and several meters, have been identified in central Sierra Norte - Eastern Pampean Ranges, Córdoba, Argentina. Their mineralogy and chemistry indicate that they are part of the calc-alkaline lamprophyres clan (CAL). They contain phenocrysts of magnesiohornblende ± augite set in a groundmass of magnesiohornblende, calcic-plagioclase, alkali feldspar, and opaque minerals, which designate them as spessartite-type lamprophyres. Alteration products include chlorite, calcite and iron oxides after mafic phenocrysts, though some are partially replaced by actinolite. Feldspars are replaced by carbonate and clay minerals. The dykes are relatively primitive, and show restricted major element variation (SiO2 51.1-55.3 wt.%, Al2O3 12-16.6 wt.%, total alkalies 1.5-4.7 wt.%), high Mg# (55-77), high Cr contents (27-988 ppm) and moderate to high Ni contents (60-190 ppm). Lamprophyre LILE (e.g. Rb averages 110 ppm, Sr 211-387 ppm, Ba 203-452 ppm) are high relative to HFSE (e.g., Ta 0.2-1.6 ppm, Nb 4-11 ppm, Y 17-21 ppm), and are enriched in LREE (30-70 times chondrite). They are characterized by relatively high 208Pb/204Pb (38.8-39.9), 207Pb/204Pb (∼15.7), and 206Pb/204Pb (18.7-20.1), combined with low (epsilon)εNd (-4.69 to -1.52) and a relative moderately high (87Sr/86Sr)i of 0.7055-0.7074. The Rb-Sr whole rock isochron indicates an Early Ordovician age of 485 ± 25 Ma. The calculated TDM (1.7 Ga) suggests that these rocks appear to have originated from a reservoir that was created during a mantle metasomatism event related to the Pampean orogeny. The Sierra Norte lamprophyres show affinities with a subduction-related magma in an active continental margin. Their geochemical and isotopic features suggest a multicomponent source, composed of enriched mantle material variably contaminated by crustal components. The lamprophyric suite emplacement occurred at the dawning stage of the Pampean orogeny, in a regional post-collisional extensional setting developed in the Sierra Norte-Ambargasta batholith (SNAB) in Early Ordovician times.
Fil: O'Leary, M. S.. Universidad Nacional del Comahue; Argentina
Fil: Lira, Raul. Universidad Nacional de Córdoba. Facultad de Cs.exactas Físicas y Naturales. Museo de Geología y Miner."dr.a.stelzner"; Argentina
Fil: Dorais, M. J.. Brigham Young University; Estados Unidos
Fil: Tassinari, C. C. G.. Universidade de Sao Paulo; Brasil - Materia
-
Argentina
Petrology And Geochemistry
Post-Collisional
Rb/Sr Age
Sierra Norte
Spessartites
Sr-Nd-Pb Isotopes - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/55367
Ver los metadatos del registro completo
id |
CONICETDig_2d50ce33da92e3e2df5e237b5a72028f |
---|---|
oai_identifier_str |
oai:ri.conicet.gov.ar:11336/55367 |
network_acronym_str |
CONICETDig |
repository_id_str |
3498 |
network_name_str |
CONICET Digital (CONICET) |
spelling |
Post-collisional lamprophyric event in Sierra Norte, Córdoba, Argentina: Mineralogical, geochemical and isotopic characteristicsO'Leary, M. S.Lira, RaulDorais, M. J.Tassinari, C. C. G.ArgentinaPetrology And GeochemistryPost-CollisionalRb/Sr AgeSierra NorteSpessartitesSr-Nd-Pb Isotopeshttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Over 20 lamprophyre dykes, varying in width between a few centimeters and several meters, have been identified in central Sierra Norte - Eastern Pampean Ranges, Córdoba, Argentina. Their mineralogy and chemistry indicate that they are part of the calc-alkaline lamprophyres clan (CAL). They contain phenocrysts of magnesiohornblende ± augite set in a groundmass of magnesiohornblende, calcic-plagioclase, alkali feldspar, and opaque minerals, which designate them as spessartite-type lamprophyres. Alteration products include chlorite, calcite and iron oxides after mafic phenocrysts, though some are partially replaced by actinolite. Feldspars are replaced by carbonate and clay minerals. The dykes are relatively primitive, and show restricted major element variation (SiO2 51.1-55.3 wt.%, Al2O3 12-16.6 wt.%, total alkalies 1.5-4.7 wt.%), high Mg# (55-77), high Cr contents (27-988 ppm) and moderate to high Ni contents (60-190 ppm). Lamprophyre LILE (e.g. Rb averages 110 ppm, Sr 211-387 ppm, Ba 203-452 ppm) are high relative to HFSE (e.g., Ta 0.2-1.6 ppm, Nb 4-11 ppm, Y 17-21 ppm), and are enriched in LREE (30-70 times chondrite). They are characterized by relatively high 208Pb/204Pb (38.8-39.9), 207Pb/204Pb (∼15.7), and 206Pb/204Pb (18.7-20.1), combined with low (epsilon)εNd (-4.69 to -1.52) and a relative moderately high (87Sr/86Sr)i of 0.7055-0.7074. The Rb-Sr whole rock isochron indicates an Early Ordovician age of 485 ± 25 Ma. The calculated TDM (1.7 Ga) suggests that these rocks appear to have originated from a reservoir that was created during a mantle metasomatism event related to the Pampean orogeny. The Sierra Norte lamprophyres show affinities with a subduction-related magma in an active continental margin. Their geochemical and isotopic features suggest a multicomponent source, composed of enriched mantle material variably contaminated by crustal components. The lamprophyric suite emplacement occurred at the dawning stage of the Pampean orogeny, in a regional post-collisional extensional setting developed in the Sierra Norte-Ambargasta batholith (SNAB) in Early Ordovician times.Fil: O'Leary, M. S.. Universidad Nacional del Comahue; ArgentinaFil: Lira, Raul. Universidad Nacional de Córdoba. Facultad de Cs.exactas Físicas y Naturales. Museo de Geología y Miner."dr.a.stelzner"; ArgentinaFil: Dorais, M. J.. Brigham Young University; Estados UnidosFil: Tassinari, C. C. G.. Universidade de Sao Paulo; BrasilPergamon-Elsevier Science Ltd2009-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/55367O'Leary, M. S.; Lira, Raul; Dorais, M. J.; Tassinari, C. C. G.; Post-collisional lamprophyric event in Sierra Norte, Córdoba, Argentina: Mineralogical, geochemical and isotopic characteristics; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 28; 10-2009; 277-2870895-9811CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981108000849info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2008.08.005info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:39:24Zoai:ri.conicet.gov.ar:11336/55367instacron: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 09:39:24.775CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Post-collisional lamprophyric event in Sierra Norte, Córdoba, Argentina: Mineralogical, geochemical and isotopic characteristics |
title |
Post-collisional lamprophyric event in Sierra Norte, Córdoba, Argentina: Mineralogical, geochemical and isotopic characteristics |
spellingShingle |
Post-collisional lamprophyric event in Sierra Norte, Córdoba, Argentina: Mineralogical, geochemical and isotopic characteristics O'Leary, M. S. Argentina Petrology And Geochemistry Post-Collisional Rb/Sr Age Sierra Norte Spessartites Sr-Nd-Pb Isotopes |
title_short |
Post-collisional lamprophyric event in Sierra Norte, Córdoba, Argentina: Mineralogical, geochemical and isotopic characteristics |
title_full |
Post-collisional lamprophyric event in Sierra Norte, Córdoba, Argentina: Mineralogical, geochemical and isotopic characteristics |
title_fullStr |
Post-collisional lamprophyric event in Sierra Norte, Córdoba, Argentina: Mineralogical, geochemical and isotopic characteristics |
title_full_unstemmed |
Post-collisional lamprophyric event in Sierra Norte, Córdoba, Argentina: Mineralogical, geochemical and isotopic characteristics |
title_sort |
Post-collisional lamprophyric event in Sierra Norte, Córdoba, Argentina: Mineralogical, geochemical and isotopic characteristics |
dc.creator.none.fl_str_mv |
O'Leary, M. S. Lira, Raul Dorais, M. J. Tassinari, C. C. G. |
author |
O'Leary, M. S. |
author_facet |
O'Leary, M. S. Lira, Raul Dorais, M. J. Tassinari, C. C. G. |
author_role |
author |
author2 |
Lira, Raul Dorais, M. J. Tassinari, C. C. G. |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
Argentina Petrology And Geochemistry Post-Collisional Rb/Sr Age Sierra Norte Spessartites Sr-Nd-Pb Isotopes |
topic |
Argentina Petrology And Geochemistry Post-Collisional Rb/Sr Age Sierra Norte Spessartites Sr-Nd-Pb Isotopes |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Over 20 lamprophyre dykes, varying in width between a few centimeters and several meters, have been identified in central Sierra Norte - Eastern Pampean Ranges, Córdoba, Argentina. Their mineralogy and chemistry indicate that they are part of the calc-alkaline lamprophyres clan (CAL). They contain phenocrysts of magnesiohornblende ± augite set in a groundmass of magnesiohornblende, calcic-plagioclase, alkali feldspar, and opaque minerals, which designate them as spessartite-type lamprophyres. Alteration products include chlorite, calcite and iron oxides after mafic phenocrysts, though some are partially replaced by actinolite. Feldspars are replaced by carbonate and clay minerals. The dykes are relatively primitive, and show restricted major element variation (SiO2 51.1-55.3 wt.%, Al2O3 12-16.6 wt.%, total alkalies 1.5-4.7 wt.%), high Mg# (55-77), high Cr contents (27-988 ppm) and moderate to high Ni contents (60-190 ppm). Lamprophyre LILE (e.g. Rb averages 110 ppm, Sr 211-387 ppm, Ba 203-452 ppm) are high relative to HFSE (e.g., Ta 0.2-1.6 ppm, Nb 4-11 ppm, Y 17-21 ppm), and are enriched in LREE (30-70 times chondrite). They are characterized by relatively high 208Pb/204Pb (38.8-39.9), 207Pb/204Pb (∼15.7), and 206Pb/204Pb (18.7-20.1), combined with low (epsilon)εNd (-4.69 to -1.52) and a relative moderately high (87Sr/86Sr)i of 0.7055-0.7074. The Rb-Sr whole rock isochron indicates an Early Ordovician age of 485 ± 25 Ma. The calculated TDM (1.7 Ga) suggests that these rocks appear to have originated from a reservoir that was created during a mantle metasomatism event related to the Pampean orogeny. The Sierra Norte lamprophyres show affinities with a subduction-related magma in an active continental margin. Their geochemical and isotopic features suggest a multicomponent source, composed of enriched mantle material variably contaminated by crustal components. The lamprophyric suite emplacement occurred at the dawning stage of the Pampean orogeny, in a regional post-collisional extensional setting developed in the Sierra Norte-Ambargasta batholith (SNAB) in Early Ordovician times. Fil: O'Leary, M. S.. Universidad Nacional del Comahue; Argentina Fil: Lira, Raul. Universidad Nacional de Córdoba. Facultad de Cs.exactas Físicas y Naturales. Museo de Geología y Miner."dr.a.stelzner"; Argentina Fil: Dorais, M. J.. Brigham Young University; Estados Unidos Fil: Tassinari, C. C. G.. Universidade de Sao Paulo; Brasil |
description |
Over 20 lamprophyre dykes, varying in width between a few centimeters and several meters, have been identified in central Sierra Norte - Eastern Pampean Ranges, Córdoba, Argentina. Their mineralogy and chemistry indicate that they are part of the calc-alkaline lamprophyres clan (CAL). They contain phenocrysts of magnesiohornblende ± augite set in a groundmass of magnesiohornblende, calcic-plagioclase, alkali feldspar, and opaque minerals, which designate them as spessartite-type lamprophyres. Alteration products include chlorite, calcite and iron oxides after mafic phenocrysts, though some are partially replaced by actinolite. Feldspars are replaced by carbonate and clay minerals. The dykes are relatively primitive, and show restricted major element variation (SiO2 51.1-55.3 wt.%, Al2O3 12-16.6 wt.%, total alkalies 1.5-4.7 wt.%), high Mg# (55-77), high Cr contents (27-988 ppm) and moderate to high Ni contents (60-190 ppm). Lamprophyre LILE (e.g. Rb averages 110 ppm, Sr 211-387 ppm, Ba 203-452 ppm) are high relative to HFSE (e.g., Ta 0.2-1.6 ppm, Nb 4-11 ppm, Y 17-21 ppm), and are enriched in LREE (30-70 times chondrite). They are characterized by relatively high 208Pb/204Pb (38.8-39.9), 207Pb/204Pb (∼15.7), and 206Pb/204Pb (18.7-20.1), combined with low (epsilon)εNd (-4.69 to -1.52) and a relative moderately high (87Sr/86Sr)i of 0.7055-0.7074. The Rb-Sr whole rock isochron indicates an Early Ordovician age of 485 ± 25 Ma. The calculated TDM (1.7 Ga) suggests that these rocks appear to have originated from a reservoir that was created during a mantle metasomatism event related to the Pampean orogeny. The Sierra Norte lamprophyres show affinities with a subduction-related magma in an active continental margin. Their geochemical and isotopic features suggest a multicomponent source, composed of enriched mantle material variably contaminated by crustal components. The lamprophyric suite emplacement occurred at the dawning stage of the Pampean orogeny, in a regional post-collisional extensional setting developed in the Sierra Norte-Ambargasta batholith (SNAB) in Early Ordovician times. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009-10 |
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/11336/55367 O'Leary, M. S.; Lira, Raul; Dorais, M. J.; Tassinari, C. C. G.; Post-collisional lamprophyric event in Sierra Norte, Córdoba, Argentina: Mineralogical, geochemical and isotopic characteristics; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 28; 10-2009; 277-287 0895-9811 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/55367 |
identifier_str_mv |
O'Leary, M. S.; Lira, Raul; Dorais, M. J.; Tassinari, C. C. G.; Post-collisional lamprophyric event in Sierra Norte, Córdoba, Argentina: Mineralogical, geochemical and isotopic characteristics; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 28; 10-2009; 277-287 0895-9811 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981108000849 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2008.08.005 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Pergamon-Elsevier Science Ltd |
publisher.none.fl_str_mv |
Pergamon-Elsevier Science Ltd |
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 |
_version_ |
1844613247133548544 |
score |
13.070432 |