Trans-Amazonian U-Th-Pb monazite ages and P-T-d exhumation paths of garnet-bearing leucogranite and migmatitic country rock of the southeastern Tandilia belt, Rio de la Plata craton in Argentina

Martínez, Juan C. Garro; Massonne, H.-J.; Frisicale, María Cristina; Dristas, Jorge A.

doi:10.1016/j.lithos.2017.01.007

Cited by 13 publications

(13 citation statements)

References 70 publications

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“…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: 76%

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: 76%

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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“…The whole-rock results of the pseudosection were simplified to an eleven 3). The O 2 content was estimated at 5% of the Fe +3 /Fe +2 ratio (e.g., Massonne et al, 2012 andMartínez et al, 2017), and the P 2 O 5 content was removed as well as a reduction of CaO, given that both oxides derive from apatite. The schist samples were modeled with 2.6% of H 2 O, while we used 2.0% of H 2 O for the migmatite P-T pseudosection (Table 3).…”

Section: P-t Pseudosections Modelsmentioning

confidence: 99%

Late Paleozoic geodynamic evolution of the western North Patagonian Massif and its tectonic context along the southwestern Gondwana margin

Marcos

Pivetta

Benedini

et al. 2020

Lithos

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“…Structural deformation in such orogenic belts facilitates mineral transformation reactions (Wheeler, 2018), so that data on rock structures and microstructures (such as textural relationships between minerals and zoning patterns within them) provide valuable clues for deciphering the metamorphic P-T-t-d evolution of metamorphic belts (e.g. Cho et al, 2007;Gomez-Rivas et al, 2020;Martinez et al, 2017;Schulz, 1990;St-Onge et al, 2013;Triboulet & Audren, 1985). Archean and Proterozoic orogenic belts are typically a collage of crustal domains of varying rock types and age, accreted and welded along crustal-scale shear zones in which rock deformation was intense (Chough et al, 2000;Echtler et al, 1997;Kusky & Li, 2003;Xu et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Metamorphic P–T–t–d evolution of the Mesoproterozoic Pur‐Banera supracrustal belt, Aravalli Craton, northwestern India: Insights from phase equilibria modelling and zircon–monazite geochronology of metapelites

D’Souza

Prabhakar

Sheth

et al. 2021

Journal Metamorphic Geology

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The Pur-Banera belt of metasedimentary rocks, in the Bhilwara region of the Aravalli Craton, northwestern India, constitutes a Mesoproterozoic rift-related supracrustal sequence. The Pur-Banera belt, while containing psammitic, calcareous, and ferruginous metasediments, is dominated by garnet-staurolite-kyanite-bearing metapelites. Here we integrate data on outcrop-and microscopic-scale deformation structures with pseudosection modelling and zircon-monazite geochronology to decipher the P-T-t-d evolution of these metapelites. The metapelites record three distinct deformation events. The first two (D 1 -D 2 ) produced a composite S 1 // S 2 foliation, and a younger event of dextral shearing (D 3 ) produced crenulations superimposed on the foliation. Textural and compositional data indicate two stages of growth of garnet, whose core compositions were significantly altered during peak metamorphism. The textures combined with pseudosection modelling and conventional thermobarometry reveal that the garnet cores continued to grow up to staurolite-grade prograde metamorphism, followed by a second stage of garnet growth (syn-D 2 ; 7.3-7.9 kbar and 665-690°C) during kyanite-grade peak metamorphism. Fibrolite grew in the matrix during post-peak readjustments due to uplift and decompression, whereas fluid-induced retrograde metamorphism (480-540°C) resulted in the formation of euhedral staurolite prisms and narrow rims around garnet porphyroblasts. Detrital zircons of magmatic origin yield a weighted mean 207 Pb/ 206 Pb age of 1,827 ± 7 Ma (95% confidence) indicating a Palaeoproterozoic igneous source rock for the sediments, consistent with a Mesoproterozoic (1.6-1.3 Ga) age of deposition as inferred in previous work on the Pur-Banera quartzofeldspathic gneisses. Monazite U-Th-(total) Pb ages indicate the timing of commencement of prograde metamorphism at c. 1.3 Ga, peak metamorphism at c. 1.2-1.1 Ga, and fluid-induced retrograde metamorphism at c. 0.85-0.75 Ga. Our combined results indicate that the metapelites experienced two deformation events (D 1 and D 2 ) during the closure of the Pur-Banera basin and the consequent burial of the sediments to lower crustal depths. These were followed by post-collisional uplift wileyonlinelibrary.com/journal/jmg

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Trans-Amazonian U-Th-Pb monazite ages and P-T-d exhumation paths of garnet-bearing leucogranite and migmatitic country rock of the southeastern Tandilia belt, Rio de la Plata craton in Argentina

Cited by 13 publications

References 70 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

Late Paleozoic geodynamic evolution of the western North Patagonian Massif and its tectonic context along the southwestern Gondwana margin

Metamorphic P–T–t–d evolution of the Mesoproterozoic Pur‐Banera supracrustal belt, Aravalli Craton, northwestern India: Insights from phase equilibria modelling and zircon–monazite geochronology of metapelites

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