Significance of graphite inclusion occurrence in the minerals of the San Miguel skarn for the Palaeoproterozoic basement of Tandilia Belt (Argentina) and for the Río de la Plata Cr...
- Autores
- Lajoinie, María Florencia; Ballivián Justiniano, Carlos Alberto; Salvioli, Melisa Ariana; Ruiz, R.; Recio, Clemente; Sial, Alcides N.; Etcheverry, Ricardo Oscar; Curci, Marcela Viviana; de la Cal, H.G.; Lanfranchini, Mabel Elena
- Año de publicación
- 2019
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Graphite in Archaean-Palaeoproterozoic rocks has been a subject of interest since it could represent an evidence of early life on Earth. In the Palaeoproterozoic basement of the Tandilia Belt, graphite was found both in fluid inclusions (FI) hosted in the San Miguel skarn calc-silicate minerals, and as solid inclusions in calcite crystals from the protolithic marble (a¹³C enriched carbonate from the “Lomagundi-Jatuli event”). FI microthermometry and oxygen stable isotope ratios indicated the skarn minerals formation within the range of 630–650 °C (at ∼5 kbars) and ∼642–654 °C, respectively. Also, the characterisation of the metasomatic fluid (of a low salinity H₂O/NaCl KCl H₂O aqueous system) pointed out that the zonal crystallisation pattern shown by the skarn minerals (wollastonite-vesuvianite, grossular-diopside-calcite and diopside-calcite zones in the exoskarn, and grossular-diopside and diopside-calcic plagioclase zones in the endoskarn) responds to the increase of the involved cation activity gradients (Ca²⁺-Si4⁺-Mg²⁺-Fe²⁺/³+-Al³⁺) and not to significant changes in the temperature or concentration of CO₂ in the system. Variation in the crystallinity degree of the graphite hosted in the skarn minerals and in marble calcite, shown by Raman spectroscopy, would indicate that the graphite could have been formed from the ripening of organic matter present in the sedimentary rocks during the metamorphic-metasomatic event (Transamazonian Orogeny). In this sense, the increase of the organic carbon productivity in the oceans during the Palaeoproterozoic, represented by the “Lomagundi-Jatuli event”, would support this graphite origin and also the possible existence of a marine sedimentary basin in the previous stages of the Rio de la Plata amalgamation (Siderian-Rhyacian), in the San Miguel area of the Tandilia Belt.
Instituto de Recursos Minerales
Comisión de Investigaciones Científicas de la provincia de Buenos Aires - Materia
-
Geología
Río de la Plata Craton
“Lomagundi-Jatuli event”
Metasomatism
Fluid inclusions
Raman spectroscopy
Syngenetic graphite - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
.jpg)
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/124587
Ver los metadatos del registro completo
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Significance of graphite inclusion occurrence in the minerals of the San Miguel skarn for the Palaeoproterozoic basement of Tandilia Belt (Argentina) and for the Río de la Plata CratonLajoinie, María FlorenciaBallivián Justiniano, Carlos AlbertoSalvioli, Melisa ArianaRuiz, R.Recio, ClementeSial, Alcides N.Etcheverry, Ricardo OscarCurci, Marcela Vivianade la Cal, H.G.Lanfranchini, Mabel ElenaGeologíaRío de la Plata Craton“Lomagundi-Jatuli event”MetasomatismFluid inclusionsRaman spectroscopySyngenetic graphiteGraphite in Archaean-Palaeoproterozoic rocks has been a subject of interest since it could represent an evidence of early life on Earth. In the Palaeoproterozoic basement of the Tandilia Belt, graphite was found both in fluid inclusions (FI) hosted in the San Miguel skarn calc-silicate minerals, and as solid inclusions in calcite crystals from the protolithic marble (a¹³C enriched carbonate from the “Lomagundi-Jatuli event”). FI microthermometry and oxygen stable isotope ratios indicated the skarn minerals formation within the range of 630–650 °C (at ∼5 kbars) and ∼642–654 °C, respectively. Also, the characterisation of the metasomatic fluid (of a low salinity H₂O/NaCl KCl H₂O aqueous system) pointed out that the zonal crystallisation pattern shown by the skarn minerals (wollastonite-vesuvianite, grossular-diopside-calcite and diopside-calcite zones in the exoskarn, and grossular-diopside and diopside-calcic plagioclase zones in the endoskarn) responds to the increase of the involved cation activity gradients (Ca²⁺-Si4⁺-Mg²⁺-Fe²⁺/³+-Al³⁺) and not to significant changes in the temperature or concentration of CO₂ in the system. Variation in the crystallinity degree of the graphite hosted in the skarn minerals and in marble calcite, shown by Raman spectroscopy, would indicate that the graphite could have been formed from the ripening of organic matter present in the sedimentary rocks during the metamorphic-metasomatic event (Transamazonian Orogeny). In this sense, the increase of the organic carbon productivity in the oceans during the Palaeoproterozoic, represented by the “Lomagundi-Jatuli event”, would support this graphite origin and also the possible existence of a marine sedimentary basin in the previous stages of the Rio de la Plata amalgamation (Siderian-Rhyacian), in the San Miguel area of the Tandilia Belt.Instituto de Recursos MineralesComisión de Investigaciones Científicas de la provincia de Buenos Aires2019info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf118-139http://sedici.unlp.edu.ar/handle/10915/124587enginfo:eu-repo/semantics/altIdentifier/issn/0895-9811info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2018.11.008info: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:UNLP2025-09-17T10:12:34Zoai:sedici.unlp.edu.ar:10915/124587Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-17 10:12:34.577SEDICI (UNLP) - Universidad Nacional de La Platafalse |
| dc.title.none.fl_str_mv |
Significance of graphite inclusion occurrence in the minerals of the San Miguel skarn for the Palaeoproterozoic basement of Tandilia Belt (Argentina) and for the Río de la Plata Craton |
| title |
Significance of graphite inclusion occurrence in the minerals of the San Miguel skarn for the Palaeoproterozoic basement of Tandilia Belt (Argentina) and for the Río de la Plata Craton |
| spellingShingle |
Significance of graphite inclusion occurrence in the minerals of the San Miguel skarn for the Palaeoproterozoic basement of Tandilia Belt (Argentina) and for the Río de la Plata Craton Lajoinie, María Florencia Geología Río de la Plata Craton “Lomagundi-Jatuli event” Metasomatism Fluid inclusions Raman spectroscopy Syngenetic graphite |
| title_short |
Significance of graphite inclusion occurrence in the minerals of the San Miguel skarn for the Palaeoproterozoic basement of Tandilia Belt (Argentina) and for the Río de la Plata Craton |
| title_full |
Significance of graphite inclusion occurrence in the minerals of the San Miguel skarn for the Palaeoproterozoic basement of Tandilia Belt (Argentina) and for the Río de la Plata Craton |
| title_fullStr |
Significance of graphite inclusion occurrence in the minerals of the San Miguel skarn for the Palaeoproterozoic basement of Tandilia Belt (Argentina) and for the Río de la Plata Craton |
| title_full_unstemmed |
Significance of graphite inclusion occurrence in the minerals of the San Miguel skarn for the Palaeoproterozoic basement of Tandilia Belt (Argentina) and for the Río de la Plata Craton |
| title_sort |
Significance of graphite inclusion occurrence in the minerals of the San Miguel skarn for the Palaeoproterozoic basement of Tandilia Belt (Argentina) and for the Río de la Plata Craton |
| dc.creator.none.fl_str_mv |
Lajoinie, María Florencia Ballivián Justiniano, Carlos Alberto Salvioli, Melisa Ariana Ruiz, R. Recio, Clemente Sial, Alcides N. Etcheverry, Ricardo Oscar Curci, Marcela Viviana de la Cal, H.G. Lanfranchini, Mabel Elena |
| author |
Lajoinie, María Florencia |
| author_facet |
Lajoinie, María Florencia Ballivián Justiniano, Carlos Alberto Salvioli, Melisa Ariana Ruiz, R. Recio, Clemente Sial, Alcides N. Etcheverry, Ricardo Oscar Curci, Marcela Viviana de la Cal, H.G. Lanfranchini, Mabel Elena |
| author_role |
author |
| author2 |
Ballivián Justiniano, Carlos Alberto Salvioli, Melisa Ariana Ruiz, R. Recio, Clemente Sial, Alcides N. Etcheverry, Ricardo Oscar Curci, Marcela Viviana de la Cal, H.G. Lanfranchini, Mabel Elena |
| author2_role |
author author author author author author author author author |
| dc.subject.none.fl_str_mv |
Geología Río de la Plata Craton “Lomagundi-Jatuli event” Metasomatism Fluid inclusions Raman spectroscopy Syngenetic graphite |
| topic |
Geología Río de la Plata Craton “Lomagundi-Jatuli event” Metasomatism Fluid inclusions Raman spectroscopy Syngenetic graphite |
| dc.description.none.fl_txt_mv |
Graphite in Archaean-Palaeoproterozoic rocks has been a subject of interest since it could represent an evidence of early life on Earth. In the Palaeoproterozoic basement of the Tandilia Belt, graphite was found both in fluid inclusions (FI) hosted in the San Miguel skarn calc-silicate minerals, and as solid inclusions in calcite crystals from the protolithic marble (a¹³C enriched carbonate from the “Lomagundi-Jatuli event”). FI microthermometry and oxygen stable isotope ratios indicated the skarn minerals formation within the range of 630–650 °C (at ∼5 kbars) and ∼642–654 °C, respectively. Also, the characterisation of the metasomatic fluid (of a low salinity H₂O/NaCl KCl H₂O aqueous system) pointed out that the zonal crystallisation pattern shown by the skarn minerals (wollastonite-vesuvianite, grossular-diopside-calcite and diopside-calcite zones in the exoskarn, and grossular-diopside and diopside-calcic plagioclase zones in the endoskarn) responds to the increase of the involved cation activity gradients (Ca²⁺-Si4⁺-Mg²⁺-Fe²⁺/³+-Al³⁺) and not to significant changes in the temperature or concentration of CO₂ in the system. Variation in the crystallinity degree of the graphite hosted in the skarn minerals and in marble calcite, shown by Raman spectroscopy, would indicate that the graphite could have been formed from the ripening of organic matter present in the sedimentary rocks during the metamorphic-metasomatic event (Transamazonian Orogeny). In this sense, the increase of the organic carbon productivity in the oceans during the Palaeoproterozoic, represented by the “Lomagundi-Jatuli event”, would support this graphite origin and also the possible existence of a marine sedimentary basin in the previous stages of the Rio de la Plata amalgamation (Siderian-Rhyacian), in the San Miguel area of the Tandilia Belt. Instituto de Recursos Minerales Comisión de Investigaciones Científicas de la provincia de Buenos Aires |
| description |
Graphite in Archaean-Palaeoproterozoic rocks has been a subject of interest since it could represent an evidence of early life on Earth. In the Palaeoproterozoic basement of the Tandilia Belt, graphite was found both in fluid inclusions (FI) hosted in the San Miguel skarn calc-silicate minerals, and as solid inclusions in calcite crystals from the protolithic marble (a¹³C enriched carbonate from the “Lomagundi-Jatuli event”). FI microthermometry and oxygen stable isotope ratios indicated the skarn minerals formation within the range of 630–650 °C (at ∼5 kbars) and ∼642–654 °C, respectively. Also, the characterisation of the metasomatic fluid (of a low salinity H₂O/NaCl KCl H₂O aqueous system) pointed out that the zonal crystallisation pattern shown by the skarn minerals (wollastonite-vesuvianite, grossular-diopside-calcite and diopside-calcite zones in the exoskarn, and grossular-diopside and diopside-calcic plagioclase zones in the endoskarn) responds to the increase of the involved cation activity gradients (Ca²⁺-Si4⁺-Mg²⁺-Fe²⁺/³+-Al³⁺) and not to significant changes in the temperature or concentration of CO₂ in the system. Variation in the crystallinity degree of the graphite hosted in the skarn minerals and in marble calcite, shown by Raman spectroscopy, would indicate that the graphite could have been formed from the ripening of organic matter present in the sedimentary rocks during the metamorphic-metasomatic event (Transamazonian Orogeny). In this sense, the increase of the organic carbon productivity in the oceans during the Palaeoproterozoic, represented by the “Lomagundi-Jatuli event”, would support this graphite origin and also the possible existence of a marine sedimentary basin in the previous stages of the Rio de la Plata amalgamation (Siderian-Rhyacian), in the San Miguel area of the Tandilia Belt. |
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2019 |
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2019 |
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eng |
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