Metamorphic evolution of the Río de la Plata Craton in the Cinco Cerros area, Buenos Aires Province, Argentina
- Autores
- Massonne, Hans-Joachim; Dristas, Jorge Anastasio; Martinez, Juan Cruz
- Año de publicación
- 2012
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- A metapelite and an interlayered granite were studied from the Cinco Cerros area ca. 65 km WNW of the city of Mar del Plata. Garnet in these samples is slightly zoned with core and rim compositions of pyr 17(gro + andr) 6spes 1.5alm 75.5 and pyr 13.5(gro + andr) 5.5spes 2alm 80, respectively, in the metapelite. Corresponding compositions in the granite are pyr 15(gro + andr) 3.5spes 3.5alm 78 and pyr 11(gro + andr) 3.5spes 4.5alm 81. We used the PERPLE_X computer software package to calculate P-T pseudosections. From the pseudosection of the metapelite P-T conditions of 6.7 kbar and 670 °C were derived for an early metamorphic stage. Subsequently, a pressure release occurred at decreasing temperatures. The final metamorphic P-T conditions recorded by the studied rock are 4.5 kbar and 600 °C compatible with the absence of cordierite, staurolite, and an Al 2SiO 5-phase. Garnet in the granitoid crystallized between 715 and 690 °C at a pressure around 7.7 kbar.U-Th-Pb age dating with the electron microprobe was performed. 16 analyses of monazite in the metapelite formed three clusters resulting in ages of I: 2073 ± 11.4 (1 σ) Ma, II: 1913 ± 11.0 (1σ) Ma, and III: 1805 ± 20.8 (1 σ) Ma. Thus, the Paleoproterozoic metamorphic event can be related to the Trans-Amazonian cycle and was followed by slow cooling.As our study area is close to the margin of the Río de la Plata Craton, where abundant magmatic arc-derived plutonic rocks are outcropping, we interpret the derived P- T data as follows: A heating event (not recorded by the studied rocks) resulted from magmas that intruded during the Trans-Amazonian cycle. This event was followed by slow exhumation, probably caused by erosion, accompanied by thermal relaxation. © 2012 Elsevier Ltd.
Fil: Massonne, Hans-Joachim. Universität Stuttgart; Alemania
Fil: Dristas, Jorge Anastasio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Martinez, Juan Cruz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina - Materia
-
Garnet
Geodynamics
Metamorphic Evolution
Metapelite
P-T Pseudosection
RÍO de La Plata Craton - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
.jpg)
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/62383
Ver los metadatos del registro completo
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Metamorphic evolution of the Río de la Plata Craton in the Cinco Cerros area, Buenos Aires Province, ArgentinaMassonne, Hans-JoachimDristas, Jorge AnastasioMartinez, Juan CruzGarnetGeodynamicsMetamorphic EvolutionMetapeliteP-T PseudosectionRÍO de La Plata Cratonhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1A metapelite and an interlayered granite were studied from the Cinco Cerros area ca. 65 km WNW of the city of Mar del Plata. Garnet in these samples is slightly zoned with core and rim compositions of pyr 17(gro + andr) 6spes 1.5alm 75.5 and pyr 13.5(gro + andr) 5.5spes 2alm 80, respectively, in the metapelite. Corresponding compositions in the granite are pyr 15(gro + andr) 3.5spes 3.5alm 78 and pyr 11(gro + andr) 3.5spes 4.5alm 81. We used the PERPLE_X computer software package to calculate P-T pseudosections. From the pseudosection of the metapelite P-T conditions of 6.7 kbar and 670 °C were derived for an early metamorphic stage. Subsequently, a pressure release occurred at decreasing temperatures. The final metamorphic P-T conditions recorded by the studied rock are 4.5 kbar and 600 °C compatible with the absence of cordierite, staurolite, and an Al 2SiO 5-phase. Garnet in the granitoid crystallized between 715 and 690 °C at a pressure around 7.7 kbar.U-Th-Pb age dating with the electron microprobe was performed. 16 analyses of monazite in the metapelite formed three clusters resulting in ages of I: 2073 ± 11.4 (1 σ) Ma, II: 1913 ± 11.0 (1σ) Ma, and III: 1805 ± 20.8 (1 σ) Ma. Thus, the Paleoproterozoic metamorphic event can be related to the Trans-Amazonian cycle and was followed by slow cooling.As our study area is close to the margin of the Río de la Plata Craton, where abundant magmatic arc-derived plutonic rocks are outcropping, we interpret the derived P- T data as follows: A heating event (not recorded by the studied rocks) resulted from magmas that intruded during the Trans-Amazonian cycle. This event was followed by slow exhumation, probably caused by erosion, accompanied by thermal relaxation. © 2012 Elsevier Ltd.Fil: Massonne, Hans-Joachim. Universität Stuttgart; AlemaniaFil: Dristas, Jorge Anastasio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaFil: Martinez, Juan Cruz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaPergamon-Elsevier Science Ltd2012-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/62383Massonne, Hans-Joachim; Dristas, Jorge Anastasio; Martinez, Juan Cruz; Metamorphic evolution of the Río de la Plata Craton in the Cinco Cerros area, Buenos Aires Province, Argentina; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 38; 10-2012; 57-700895-9811CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2012.05.005info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S089598111200065Xinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:24:21Zoai:ri.conicet.gov.ar:11336/62383instacron: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:34982025-10-22 11:24:22.034CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
| dc.title.none.fl_str_mv |
Metamorphic evolution of the Río de la Plata Craton in the Cinco Cerros area, Buenos Aires Province, Argentina |
| title |
Metamorphic evolution of the Río de la Plata Craton in the Cinco Cerros area, Buenos Aires Province, Argentina |
| spellingShingle |
Metamorphic evolution of the Río de la Plata Craton in the Cinco Cerros area, Buenos Aires Province, Argentina Massonne, Hans-Joachim Garnet Geodynamics Metamorphic Evolution Metapelite P-T Pseudosection RÍO de La Plata Craton |
| title_short |
Metamorphic evolution of the Río de la Plata Craton in the Cinco Cerros area, Buenos Aires Province, Argentina |
| title_full |
Metamorphic evolution of the Río de la Plata Craton in the Cinco Cerros area, Buenos Aires Province, Argentina |
| title_fullStr |
Metamorphic evolution of the Río de la Plata Craton in the Cinco Cerros area, Buenos Aires Province, Argentina |
| title_full_unstemmed |
Metamorphic evolution of the Río de la Plata Craton in the Cinco Cerros area, Buenos Aires Province, Argentina |
| title_sort |
Metamorphic evolution of the Río de la Plata Craton in the Cinco Cerros area, Buenos Aires Province, Argentina |
| dc.creator.none.fl_str_mv |
Massonne, Hans-Joachim Dristas, Jorge Anastasio Martinez, Juan Cruz |
| author |
Massonne, Hans-Joachim |
| author_facet |
Massonne, Hans-Joachim Dristas, Jorge Anastasio Martinez, Juan Cruz |
| author_role |
author |
| author2 |
Dristas, Jorge Anastasio Martinez, Juan Cruz |
| author2_role |
author author |
| dc.subject.none.fl_str_mv |
Garnet Geodynamics Metamorphic Evolution Metapelite P-T Pseudosection RÍO de La Plata Craton |
| topic |
Garnet Geodynamics Metamorphic Evolution Metapelite P-T Pseudosection RÍO de La Plata Craton |
| purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
| dc.description.none.fl_txt_mv |
A metapelite and an interlayered granite were studied from the Cinco Cerros area ca. 65 km WNW of the city of Mar del Plata. Garnet in these samples is slightly zoned with core and rim compositions of pyr 17(gro + andr) 6spes 1.5alm 75.5 and pyr 13.5(gro + andr) 5.5spes 2alm 80, respectively, in the metapelite. Corresponding compositions in the granite are pyr 15(gro + andr) 3.5spes 3.5alm 78 and pyr 11(gro + andr) 3.5spes 4.5alm 81. We used the PERPLE_X computer software package to calculate P-T pseudosections. From the pseudosection of the metapelite P-T conditions of 6.7 kbar and 670 °C were derived for an early metamorphic stage. Subsequently, a pressure release occurred at decreasing temperatures. The final metamorphic P-T conditions recorded by the studied rock are 4.5 kbar and 600 °C compatible with the absence of cordierite, staurolite, and an Al 2SiO 5-phase. Garnet in the granitoid crystallized between 715 and 690 °C at a pressure around 7.7 kbar.U-Th-Pb age dating with the electron microprobe was performed. 16 analyses of monazite in the metapelite formed three clusters resulting in ages of I: 2073 ± 11.4 (1 σ) Ma, II: 1913 ± 11.0 (1σ) Ma, and III: 1805 ± 20.8 (1 σ) Ma. Thus, the Paleoproterozoic metamorphic event can be related to the Trans-Amazonian cycle and was followed by slow cooling.As our study area is close to the margin of the Río de la Plata Craton, where abundant magmatic arc-derived plutonic rocks are outcropping, we interpret the derived P- T data as follows: A heating event (not recorded by the studied rocks) resulted from magmas that intruded during the Trans-Amazonian cycle. This event was followed by slow exhumation, probably caused by erosion, accompanied by thermal relaxation. © 2012 Elsevier Ltd. Fil: Massonne, Hans-Joachim. Universität Stuttgart; Alemania Fil: Dristas, Jorge Anastasio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina Fil: Martinez, Juan Cruz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina |
| description |
A metapelite and an interlayered granite were studied from the Cinco Cerros area ca. 65 km WNW of the city of Mar del Plata. Garnet in these samples is slightly zoned with core and rim compositions of pyr 17(gro + andr) 6spes 1.5alm 75.5 and pyr 13.5(gro + andr) 5.5spes 2alm 80, respectively, in the metapelite. Corresponding compositions in the granite are pyr 15(gro + andr) 3.5spes 3.5alm 78 and pyr 11(gro + andr) 3.5spes 4.5alm 81. We used the PERPLE_X computer software package to calculate P-T pseudosections. From the pseudosection of the metapelite P-T conditions of 6.7 kbar and 670 °C were derived for an early metamorphic stage. Subsequently, a pressure release occurred at decreasing temperatures. The final metamorphic P-T conditions recorded by the studied rock are 4.5 kbar and 600 °C compatible with the absence of cordierite, staurolite, and an Al 2SiO 5-phase. Garnet in the granitoid crystallized between 715 and 690 °C at a pressure around 7.7 kbar.U-Th-Pb age dating with the electron microprobe was performed. 16 analyses of monazite in the metapelite formed three clusters resulting in ages of I: 2073 ± 11.4 (1 σ) Ma, II: 1913 ± 11.0 (1σ) Ma, and III: 1805 ± 20.8 (1 σ) Ma. Thus, the Paleoproterozoic metamorphic event can be related to the Trans-Amazonian cycle and was followed by slow cooling.As our study area is close to the margin of the Río de la Plata Craton, where abundant magmatic arc-derived plutonic rocks are outcropping, we interpret the derived P- T data as follows: A heating event (not recorded by the studied rocks) resulted from magmas that intruded during the Trans-Amazonian cycle. This event was followed by slow exhumation, probably caused by erosion, accompanied by thermal relaxation. © 2012 Elsevier Ltd. |
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2012 |
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2012-10 |
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http://hdl.handle.net/11336/62383 Massonne, Hans-Joachim; Dristas, Jorge Anastasio; Martinez, Juan Cruz; Metamorphic evolution of the Río de la Plata Craton in the Cinco Cerros area, Buenos Aires Province, Argentina; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 38; 10-2012; 57-70 0895-9811 CONICET Digital CONICET |
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Massonne, Hans-Joachim; Dristas, Jorge Anastasio; Martinez, Juan Cruz; Metamorphic evolution of the Río de la Plata Craton in the Cinco Cerros area, Buenos Aires Province, Argentina; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 38; 10-2012; 57-70 0895-9811 CONICET Digital CONICET |
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