Dolomitic marbles and associated calc-silicates, Tandilia belt, Argentina: Geothermobarometry, metamorphic evolution, and P–T path

Delpino, Sergio; Dristas, Jorge A.

doi:10.1016/j.jsames.2007.06.001

Cited by 18 publications

(16 citation statements)

References 30 publications

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“…1b; Delpino and Dristas, 2008). In this last sector, the geothermobarometric data shows metamorphic conditions of 750-800°C and 5-6 kbar followed by an isobaric cooling to 450-500°C (Delpino and Dristas, 2008). Similar barometric data of 4.5-6.7 kbar and 5.8-7 kbar was obtained by Massonne (2012) and Martínez et al (2016Martínez et al ( , 2017 respectively, in nearby sectors of the Balcarce area.…”

Section: Tandilia Beltsupporting

confidence: 74%

“…1b; Quartino and Villar Fabre, 1967;Lajoinie et al, 2013;Lajoinie, 2015) and in Punta Tota, Sierra de Bachicha (Fig. 1b; Delpino and Dristas, 2008). In this last sector, the geothermobarometric data shows metamorphic conditions of 750-800°C and 5-6 kbar followed by an isobaric cooling to 450-500°C (Delpino and Dristas, 2008).…”

Section: Tandilia Beltmentioning

confidence: 90%

“…The Palaeoproterozoic basement of the Tandilia Belt, Buenos Aires province (Argentina), hosts two skarn deposits: Punta Tota (Delpino, 2000;Delpino and Dristas, 2008) located nearby Balcarce city, and San Miguel (Lajoinie, 2015;Lajoinie et al, 2013Lajoinie et al, , 2017a, situated SW of https://doi.org/10.1016/j.jsames.2018.11.008 Received 5 July 2018; Received in revised form 8 October 2018; Accepted 13 November 2018…”

Section: Introductionmentioning

confidence: 99%

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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 Craton

Lajoinie

Justiniano

Salvioli

et al. 2019

Journal of South American Earth Sciences

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A B S T R A C TGraphite 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 (a 13 C 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 < 7 wt% NaCl eq. NaCleH 2 O/NaCleKCleH 2 O 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 (Ca 2+ -Si 4+ -Mg 2+ -Fe 2+/3+ -Al 3+ ) and not to significant changes in the temperature or concentration of CO 2 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 Río de la Plata amalgamation (Siderian-Rhyacian), in the San Miguel area of the Tandilia Belt.

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Section: Tandilia Beltsupporting

confidence: 74%

Section: Tandilia Beltmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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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 Craton

Lajoinie

Justiniano

Salvioli

et al. 2019

Journal of South American Earth Sciences

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“…Supracrustal rocks associated with the orthogneisses include micaschists and dolomitic marbles. Delpino and Dristas (2008) estimated the peak metamorphic conditions for the marbles from Punta Tota (NE Tandilia Belt) at 750-800°C and 5-6 kb and metamorphic conditions that followed a counterclockwise P-T trajectory suggesting extension and thinning of the crust in an intraplate setting or a marginal back-arc basin.…”

Section: Geological Overview Of the Río De La Plata Cratonmentioning

confidence: 99%

The Río de la Plata Craton: a review of units, boundaries, ages and isotopic signature

Oyhantçabal

Siegesmund

Wemmer

2010

Int J Earth Sci (Geol Rundsch)

189

168

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“…The former is mainly composed by granitoids, migmatites, amphibolites, gneisses, mylonitic rocks, metavolcanic rocks and marbles (Cingolani & Dalla Salda, 2000, Delpino & Dristas, 2007. These rocks are largely related to the Transamazonia Orogenic cycle, ca.…”

Section: Gzg Universität Göttingen Germanymentioning

confidence: 99%

International Lateinamerika-Kolloquium 2009

Möller-McNett¹

2009

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Dolomitic marbles and associated calc-silicates, Tandilia belt, Argentina: Geothermobarometry, metamorphic evolution, and P–T path

Cited by 18 publications

References 30 publications

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

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

The Río de la Plata Craton: a review of units, boundaries, ages and isotopic signature

International Lateinamerika-Kolloquium 2009

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