The Lomagundi-Jatuli carbon isotopic event recorded in the marble of the Tandilia System basement, Río de la Plata Craton, Argentina

The “Lomagundi-Jatuli event” corresponds to the most important δ13C positive anomaly (≥5‰) globally reported in Palaeoproterozoic marine carbonates (between ∼2.30 and 2.06 Ga). In the Tandilia System (Argentina), Río de la Plata Craton, this event was recorded in the basement marble of the San Migue...

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Autores principales: Lajoinie, María Florencia, Lanfranchini, Mabel Elena, Recio, Clemente, Sial, Alcides N., Cingolani, Carlos Alberto, Ballivián Justiniano, Carlos Alberto, Etcheverry, Ricardo Oscar
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2019
Materias:
Geología
Lomagundi-Jatuli event
Carbon isotope
Metamorphism
Tandilia System
Palaeoproterozoic marble
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125170
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125170
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Lomagundi-Jatuli event
Carbon isotope
Metamorphism
Tandilia System
Palaeoproterozoic marble
spellingShingle Geología
Lomagundi-Jatuli event
Carbon isotope
Metamorphism
Tandilia System
Palaeoproterozoic marble
Lajoinie, María Florencia
Lanfranchini, Mabel Elena
Recio, Clemente
Sial, Alcides N.
Cingolani, Carlos Alberto
Ballivián Justiniano, Carlos Alberto
Etcheverry, Ricardo Oscar
The Lomagundi-Jatuli carbon isotopic event recorded in the marble of the Tandilia System basement, Río de la Plata Craton, Argentina
topic_facet Geología
Lomagundi-Jatuli event
Carbon isotope
Metamorphism
Tandilia System
Palaeoproterozoic marble
description The “Lomagundi-Jatuli event” corresponds to the most important δ13C positive anomaly (≥5‰) globally reported in Palaeoproterozoic marine carbonates (between ∼2.30 and 2.06 Ga). In the Tandilia System (Argentina), Río de la Plata Craton, this event was recorded in the basement marble of the San Miguel area. The calcite-diopside marble, hosted by biotite gneiss and intruded by 2.12 Ga garnet-leucogranite, was metamorphosed in amphibolite facies during the Transamazonian Cycle. PAAS-normalised rare-earth elements (REE) and Y for the carbonate rocks are HREE-enriched and display positive Eu and Y anomalies, typical of primary precipitates from a mixed hydrothermal-marine environment carbonate. Additionally, a truly negative Ce anomaly for all the samples indicates that the depositional environment was oxidising. Positive δ13C values ranging from +5.90 to +4.30‰ (V-PDB), and δ18O from +17.45 to +13.84‰ (V-SMOW) were determined in this marble, both gradually decreasing towards the contact with the leucogranites. These values indicate that devolatilization reactions took place during the crystallisation of a wollastonite-vesuvianite-grossular-diopside skarn generated by the leucogranite intrusions into the marble. δ18O values obtained from diopside and calcite crystals, in the marble sectors furthest from the contacts with leucogranite, allowed a 663–623 °C formation temperature to be calculated, considering oxygen in a calcite-diopside geothermometric pair. These temperatures are consistent with the metamorphic degree (amphibolite facies) reached in this portion of the basement. Although the San Miguel marble shows petrographic and mineralogical evidence of regional and contact metamorphism, important geochemical and isotopic characteristics, together with its estimated Palaeoproterozoic age, indicate that the marble protolith was a marine carbonate deposited during the “Lomagundi-Jatuli event”.
format Articulo
Preprint
author Lajoinie, María Florencia
Lanfranchini, Mabel Elena
Recio, Clemente
Sial, Alcides N.
Cingolani, Carlos Alberto
Ballivián Justiniano, Carlos Alberto
Etcheverry, Ricardo Oscar
author_facet Lajoinie, María Florencia
Lanfranchini, Mabel Elena
Recio, Clemente
Sial, Alcides N.
Cingolani, Carlos Alberto
Ballivián Justiniano, Carlos Alberto
Etcheverry, Ricardo Oscar
author_sort Lajoinie, María Florencia
title The Lomagundi-Jatuli carbon isotopic event recorded in the marble of the Tandilia System basement, Río de la Plata Craton, Argentina
title_short The Lomagundi-Jatuli carbon isotopic event recorded in the marble of the Tandilia System basement, Río de la Plata Craton, Argentina
title_full The Lomagundi-Jatuli carbon isotopic event recorded in the marble of the Tandilia System basement, Río de la Plata Craton, Argentina
title_fullStr The Lomagundi-Jatuli carbon isotopic event recorded in the marble of the Tandilia System basement, Río de la Plata Craton, Argentina
title_full_unstemmed The Lomagundi-Jatuli carbon isotopic event recorded in the marble of the Tandilia System basement, Río de la Plata Craton, Argentina
title_sort lomagundi-jatuli carbon isotopic event recorded in the marble of the tandilia system basement, río de la plata craton, argentina
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/125170
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