How melt segregation affects granite chemistry: Migmatites from the Sierra de Quilmes, NW Argentina
- Autores
- Wolfram, L. C.; Weinberg, Roberto F.; Hasalová, Pavlína; Becchio, Raul Alberto
- Año de publicación
- 2017
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Compositional variability of crustal-derived granites has been attributed to a multitude of processes. Although there has been much discussion on the entrainment of residuum and its effect on granite magma chemistry, the exact nature of what is entrained and when entrainment is efficient remain unclear. We describe the relationship between granulite-facies migmatites and granites in the Sierra de Quilmes, NW Argentina, focusing on how the style of melt segregation affects its ability to disaggregate the source and carry residual minerals, and therefore control granite chemistry. The north-south-trending mountains that define the region known as the Sierras Pampeanas are characterized by variably metamorphosed turbidites of the Neoproterozoic-Cambrian Puncoviscana Formation. Early Ordovician subduction on the western Gondwana margin produced widespread high-T, low-P metamorphism of the turbidites during the Famatinian orogeny (~500- 440 Ma), resulting in extensive anatexis and granite plutonism. The Tolombón complex of the northern Sierra de Quilmes is a tilted metamorphic sequence in the northern Sierras Pampeanas, providing near-complete exposure from granulite-facies magma source rocks in the SW to granite emplacement levels in amphibolite- and greenschist-facies rocks in the NE. Anatexis is associated with fluid-absent incongruent breakdown of biotite in granulite-facies rocks, evidenced by the presence of peritectic Grt±Crd±Opx. The western Tolombón complex is separated from the Ovejeria complex by a shear zone. The Ovejeria complex is distinguished by a generally higher melt fraction, and is dominated by gradational contacts from metatexites to diatexites and granites. In contrast, in the Tolombón complex, with few examples of diatexites, magmas are more commonly extracted from metatexites, and migrate to feed stocks and plutons at higher crustal levels. Granites derived from diatexites tend to remain close to the source and retain strong compositional similarities to the Puncoviscana Formation protolith, indicating significant mobilization of residuum, and defining the Ovejeria style of granite formation. Granites derived dominantly from melt extraction from metatexites tend to be leucogranites with compositions approaching those of experimental melts, defining the Tolombón style of granite formation. Magma derived through either mechanism undergoes further differentiation, giving rise to the compositionally diverse suite of rocks common to most anatectic terranes. Magmas derived through the Tolombón style of melt extraction are leucocratic and impoverished in light rare earth elements (LREE), Th, and Zr compared with both the sedimentary source rocks and residuum-rich magmas derived through the Ovejeria style of granite formation. The low solubility of zircon and monazite in relatively dry, peraluminous leucogranite melts guarantees that Zr, Th, and LREE behave as compatible elements during dehydration melting of metasedimentary packages. Therefore, neither style of granite formation contributed to the transfer of many of the typical trace elements enriched in the upper crust. Instead, biotite dehydration melting in the Sierra de Quilmes had the opposite effect of typical crustal differentiation, concentrating these trace elements in the residual source, possibly reflecting the lack of a pressure gradient driving extraction of residuum-rich magmas.
Fil: Wolfram, L. C.. Monash University; Australia
Fil: Weinberg, Roberto F.. Monash University; Australia
Fil: Hasalová, Pavlína. Czech Geological Survey; República Checa
Fil: Becchio, Raul Alberto. Universidad Nacional de Salta; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina - Materia
-
CRUSTAL DIFFERENTIATION
MONAZITE DISSOLUTION
PARTIAL MELTING
RESIDUUM ENTRAINMENT
ZIRCON - 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:11336/98462
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How melt segregation affects granite chemistry: Migmatites from the Sierra de Quilmes, NW ArgentinaWolfram, L. C.Weinberg, Roberto F.Hasalová, PavlínaBecchio, Raul AlbertoCRUSTAL DIFFERENTIATIONMONAZITE DISSOLUTIONPARTIAL MELTINGRESIDUUM ENTRAINMENTZIRCONhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Compositional variability of crustal-derived granites has been attributed to a multitude of processes. Although there has been much discussion on the entrainment of residuum and its effect on granite magma chemistry, the exact nature of what is entrained and when entrainment is efficient remain unclear. We describe the relationship between granulite-facies migmatites and granites in the Sierra de Quilmes, NW Argentina, focusing on how the style of melt segregation affects its ability to disaggregate the source and carry residual minerals, and therefore control granite chemistry. The north-south-trending mountains that define the region known as the Sierras Pampeanas are characterized by variably metamorphosed turbidites of the Neoproterozoic-Cambrian Puncoviscana Formation. Early Ordovician subduction on the western Gondwana margin produced widespread high-T, low-P metamorphism of the turbidites during the Famatinian orogeny (~500- 440 Ma), resulting in extensive anatexis and granite plutonism. The Tolombón complex of the northern Sierra de Quilmes is a tilted metamorphic sequence in the northern Sierras Pampeanas, providing near-complete exposure from granulite-facies magma source rocks in the SW to granite emplacement levels in amphibolite- and greenschist-facies rocks in the NE. Anatexis is associated with fluid-absent incongruent breakdown of biotite in granulite-facies rocks, evidenced by the presence of peritectic Grt±Crd±Opx. The western Tolombón complex is separated from the Ovejeria complex by a shear zone. The Ovejeria complex is distinguished by a generally higher melt fraction, and is dominated by gradational contacts from metatexites to diatexites and granites. In contrast, in the Tolombón complex, with few examples of diatexites, magmas are more commonly extracted from metatexites, and migrate to feed stocks and plutons at higher crustal levels. Granites derived from diatexites tend to remain close to the source and retain strong compositional similarities to the Puncoviscana Formation protolith, indicating significant mobilization of residuum, and defining the Ovejeria style of granite formation. Granites derived dominantly from melt extraction from metatexites tend to be leucogranites with compositions approaching those of experimental melts, defining the Tolombón style of granite formation. Magma derived through either mechanism undergoes further differentiation, giving rise to the compositionally diverse suite of rocks common to most anatectic terranes. Magmas derived through the Tolombón style of melt extraction are leucocratic and impoverished in light rare earth elements (LREE), Th, and Zr compared with both the sedimentary source rocks and residuum-rich magmas derived through the Ovejeria style of granite formation. The low solubility of zircon and monazite in relatively dry, peraluminous leucogranite melts guarantees that Zr, Th, and LREE behave as compatible elements during dehydration melting of metasedimentary packages. Therefore, neither style of granite formation contributed to the transfer of many of the typical trace elements enriched in the upper crust. Instead, biotite dehydration melting in the Sierra de Quilmes had the opposite effect of typical crustal differentiation, concentrating these trace elements in the residual source, possibly reflecting the lack of a pressure gradient driving extraction of residuum-rich magmas.Fil: Wolfram, L. C.. Monash University; AustraliaFil: Weinberg, Roberto F.. Monash University; AustraliaFil: Hasalová, Pavlína. Czech Geological Survey; República ChecaFil: Becchio, Raul Alberto. Universidad Nacional de Salta; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaOxford University Press2017-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/98462Wolfram, L. C.; Weinberg, Roberto F.; Hasalová, Pavlína; Becchio, Raul Alberto; How melt segregation affects granite chemistry: Migmatites from the Sierra de Quilmes, NW Argentina; Oxford University Press; Journal Of Petrology; 58; 12; 12-2017; 2339-23640022-3530CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1093/petrology/egy010info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/petrology/article/58/12/2339/4857452info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:41:14Zoai:ri.conicet.gov.ar:11336/98462instacron: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 09:41:15.01CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
How melt segregation affects granite chemistry: Migmatites from the Sierra de Quilmes, NW Argentina |
title |
How melt segregation affects granite chemistry: Migmatites from the Sierra de Quilmes, NW Argentina |
spellingShingle |
How melt segregation affects granite chemistry: Migmatites from the Sierra de Quilmes, NW Argentina Wolfram, L. C. CRUSTAL DIFFERENTIATION MONAZITE DISSOLUTION PARTIAL MELTING RESIDUUM ENTRAINMENT ZIRCON |
title_short |
How melt segregation affects granite chemistry: Migmatites from the Sierra de Quilmes, NW Argentina |
title_full |
How melt segregation affects granite chemistry: Migmatites from the Sierra de Quilmes, NW Argentina |
title_fullStr |
How melt segregation affects granite chemistry: Migmatites from the Sierra de Quilmes, NW Argentina |
title_full_unstemmed |
How melt segregation affects granite chemistry: Migmatites from the Sierra de Quilmes, NW Argentina |
title_sort |
How melt segregation affects granite chemistry: Migmatites from the Sierra de Quilmes, NW Argentina |
dc.creator.none.fl_str_mv |
Wolfram, L. C. Weinberg, Roberto F. Hasalová, Pavlína Becchio, Raul Alberto |
author |
Wolfram, L. C. |
author_facet |
Wolfram, L. C. Weinberg, Roberto F. Hasalová, Pavlína Becchio, Raul Alberto |
author_role |
author |
author2 |
Weinberg, Roberto F. Hasalová, Pavlína Becchio, Raul Alberto |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
CRUSTAL DIFFERENTIATION MONAZITE DISSOLUTION PARTIAL MELTING RESIDUUM ENTRAINMENT ZIRCON |
topic |
CRUSTAL DIFFERENTIATION MONAZITE DISSOLUTION PARTIAL MELTING RESIDUUM ENTRAINMENT ZIRCON |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Compositional variability of crustal-derived granites has been attributed to a multitude of processes. Although there has been much discussion on the entrainment of residuum and its effect on granite magma chemistry, the exact nature of what is entrained and when entrainment is efficient remain unclear. We describe the relationship between granulite-facies migmatites and granites in the Sierra de Quilmes, NW Argentina, focusing on how the style of melt segregation affects its ability to disaggregate the source and carry residual minerals, and therefore control granite chemistry. The north-south-trending mountains that define the region known as the Sierras Pampeanas are characterized by variably metamorphosed turbidites of the Neoproterozoic-Cambrian Puncoviscana Formation. Early Ordovician subduction on the western Gondwana margin produced widespread high-T, low-P metamorphism of the turbidites during the Famatinian orogeny (~500- 440 Ma), resulting in extensive anatexis and granite plutonism. The Tolombón complex of the northern Sierra de Quilmes is a tilted metamorphic sequence in the northern Sierras Pampeanas, providing near-complete exposure from granulite-facies magma source rocks in the SW to granite emplacement levels in amphibolite- and greenschist-facies rocks in the NE. Anatexis is associated with fluid-absent incongruent breakdown of biotite in granulite-facies rocks, evidenced by the presence of peritectic Grt±Crd±Opx. The western Tolombón complex is separated from the Ovejeria complex by a shear zone. The Ovejeria complex is distinguished by a generally higher melt fraction, and is dominated by gradational contacts from metatexites to diatexites and granites. In contrast, in the Tolombón complex, with few examples of diatexites, magmas are more commonly extracted from metatexites, and migrate to feed stocks and plutons at higher crustal levels. Granites derived from diatexites tend to remain close to the source and retain strong compositional similarities to the Puncoviscana Formation protolith, indicating significant mobilization of residuum, and defining the Ovejeria style of granite formation. Granites derived dominantly from melt extraction from metatexites tend to be leucogranites with compositions approaching those of experimental melts, defining the Tolombón style of granite formation. Magma derived through either mechanism undergoes further differentiation, giving rise to the compositionally diverse suite of rocks common to most anatectic terranes. Magmas derived through the Tolombón style of melt extraction are leucocratic and impoverished in light rare earth elements (LREE), Th, and Zr compared with both the sedimentary source rocks and residuum-rich magmas derived through the Ovejeria style of granite formation. The low solubility of zircon and monazite in relatively dry, peraluminous leucogranite melts guarantees that Zr, Th, and LREE behave as compatible elements during dehydration melting of metasedimentary packages. Therefore, neither style of granite formation contributed to the transfer of many of the typical trace elements enriched in the upper crust. Instead, biotite dehydration melting in the Sierra de Quilmes had the opposite effect of typical crustal differentiation, concentrating these trace elements in the residual source, possibly reflecting the lack of a pressure gradient driving extraction of residuum-rich magmas. Fil: Wolfram, L. C.. Monash University; Australia Fil: Weinberg, Roberto F.. Monash University; Australia Fil: Hasalová, Pavlína. Czech Geological Survey; República Checa Fil: Becchio, Raul Alberto. Universidad Nacional de Salta; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina |
description |
Compositional variability of crustal-derived granites has been attributed to a multitude of processes. Although there has been much discussion on the entrainment of residuum and its effect on granite magma chemistry, the exact nature of what is entrained and when entrainment is efficient remain unclear. We describe the relationship between granulite-facies migmatites and granites in the Sierra de Quilmes, NW Argentina, focusing on how the style of melt segregation affects its ability to disaggregate the source and carry residual minerals, and therefore control granite chemistry. The north-south-trending mountains that define the region known as the Sierras Pampeanas are characterized by variably metamorphosed turbidites of the Neoproterozoic-Cambrian Puncoviscana Formation. Early Ordovician subduction on the western Gondwana margin produced widespread high-T, low-P metamorphism of the turbidites during the Famatinian orogeny (~500- 440 Ma), resulting in extensive anatexis and granite plutonism. The Tolombón complex of the northern Sierra de Quilmes is a tilted metamorphic sequence in the northern Sierras Pampeanas, providing near-complete exposure from granulite-facies magma source rocks in the SW to granite emplacement levels in amphibolite- and greenschist-facies rocks in the NE. Anatexis is associated with fluid-absent incongruent breakdown of biotite in granulite-facies rocks, evidenced by the presence of peritectic Grt±Crd±Opx. The western Tolombón complex is separated from the Ovejeria complex by a shear zone. The Ovejeria complex is distinguished by a generally higher melt fraction, and is dominated by gradational contacts from metatexites to diatexites and granites. In contrast, in the Tolombón complex, with few examples of diatexites, magmas are more commonly extracted from metatexites, and migrate to feed stocks and plutons at higher crustal levels. Granites derived from diatexites tend to remain close to the source and retain strong compositional similarities to the Puncoviscana Formation protolith, indicating significant mobilization of residuum, and defining the Ovejeria style of granite formation. Granites derived dominantly from melt extraction from metatexites tend to be leucogranites with compositions approaching those of experimental melts, defining the Tolombón style of granite formation. Magma derived through either mechanism undergoes further differentiation, giving rise to the compositionally diverse suite of rocks common to most anatectic terranes. Magmas derived through the Tolombón style of melt extraction are leucocratic and impoverished in light rare earth elements (LREE), Th, and Zr compared with both the sedimentary source rocks and residuum-rich magmas derived through the Ovejeria style of granite formation. The low solubility of zircon and monazite in relatively dry, peraluminous leucogranite melts guarantees that Zr, Th, and LREE behave as compatible elements during dehydration melting of metasedimentary packages. Therefore, neither style of granite formation contributed to the transfer of many of the typical trace elements enriched in the upper crust. Instead, biotite dehydration melting in the Sierra de Quilmes had the opposite effect of typical crustal differentiation, concentrating these trace elements in the residual source, possibly reflecting the lack of a pressure gradient driving extraction of residuum-rich magmas. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-12 |
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/11336/98462 Wolfram, L. C.; Weinberg, Roberto F.; Hasalová, Pavlína; Becchio, Raul Alberto; How melt segregation affects granite chemistry: Migmatites from the Sierra de Quilmes, NW Argentina; Oxford University Press; Journal Of Petrology; 58; 12; 12-2017; 2339-2364 0022-3530 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/98462 |
identifier_str_mv |
Wolfram, L. C.; Weinberg, Roberto F.; Hasalová, Pavlína; Becchio, Raul Alberto; How melt segregation affects granite chemistry: Migmatites from the Sierra de Quilmes, NW Argentina; Oxford University Press; Journal Of Petrology; 58; 12; 12-2017; 2339-2364 0022-3530 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1093/petrology/egy010 info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/petrology/article/58/12/2339/4857452 |
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 |
Oxford University Press |
publisher.none.fl_str_mv |
Oxford University Press |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
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dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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