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Carbonatites from Eastern Paraguay and genetic relationships with potassic magmatism: C, O, Sr and Nd Isotopes

Karbonatite aus Ost-Paraguay und ihre genetische Beziehung zu Kalium-Magmatismus: C O, Sr und Nd isotope

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Summary

Geochemical characteristics were systematically determined for Early Cretaceous samples of carbonatitic rocks from Eastern Paraguay (Rio Apa, Amambay and Central Provinces). The data show that all the occurrences have an enriched isotopic signature and that the carbonatites have negligible or absent crustal signature. A petrogenetic model (parent liquids, fractional crystallization, hydrothermal interactions and weathering) is proposed as a function of incompatible trace element, stable (O-C) and radiogenic (Sr-Nd) isotope variations with the aim to test the significance of carbonatitic complexes as a marker of the metasomatized subcontinental lithospheric mantle. The results indicate that the carbonatites and primary carbonates from eastern Paraguay, and those from the north eastern Paraná Basin (SE Brazil), were affected by metasomatic events distinct in time and composition.

Zusammenfassung

Die geochemischen Charakteristika von frühkretazischen Karbonatitproben aus Ostparaguay (Rio Alpa, Amambay und Zentrale Provinzen) wurden untersucht. Die Daten belegen, daß alle Vorkommen eine isotopische Anreicherungssignatur zeigen und daß ihnen eine entsprechende Krustensignatur fehlt. Ein Petrologisches Modell (Ausgangsschmelze, fraktionierte Kristallisation, hydrothermale Interaktion und Verwitterung) wird auf Grund der Verteilung der inkompatiblen Spurenelemente, der stabilen (C-O) und radiogenen (Sr-Nd) Isotope vorgeschlagen. Es versucht die Bedeutung der Karbonatitkomplexe als „Markerhorizonte” des metasomatischen subkontinentalen Mantels zu überprüfen. Die Ergebnisse zeigen, daß die Karbonatite und die primären Karbonate in Ostparaguay, und jene aus dem Paraná Becken SüdostBrasiliens durch zeitlich und zusammensetzungsmäßig unterschiedliche metasomatische Prozesse erfaßt wurden.

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Author notes

  1. C. B. Gomes, T. I. Ribeiro de Almeida & M. C. M. Toledo

    Present address: Pós-Graduação, Instituto de Geociências, Universidade de São Paulo, Caixa Postal 11348, 05422-970, São Paulo, Brazil

Authors and Affiliations

  1. Dipartimento di Scienze della Terra, Unibersità “La Sapienza”, Piazzale Aldo Moro 5, I-00185, Rome, Italy

    F. Castorinal

  2. Istituto di Mineralogia, Petrografia e Geochimica dell 'Università, Via Archirafi 36, I-90100, Palermo, Italy

    P. Censi & S. Speziale

  3. Dipartimento di Ingegneria Chimica, dell'Ambiente e delle Materie Prime dell'Università, Piazzale Europa 1, I-34127, Trieste, Italy

    P. Comin-Chiaramonti

  4. Dipartimento di Scienze della Terra dell'Università, Via E. Weiss 8, I-34127, Trieste, Italy

    E. M. Piccirillo

  5. Centro de Tecnologia Mineral, CNPq, Ilha do Fundão, Rio de Janeiro, Brazil

    A. Alcover Neto

  6. Pós-Graduação, Instituto de Geociências, Universidade de São Paulo, Caixa Postal 11348, 05422-970, São Paulo, Brazil

    A. Alcover Neto

  7. Instituto de Geociências, São Paulo University, USP, São Paulo, Brazil

    C. B. Gomes, T. I. Ribeiro de Almeida & M. C. M. Toledo

  8. NUPEGEL - Nucleo de pesquisas em Geoquimica e Geofisica da Litosfera, USP, São Paulo, Brazil

    M. C. M. Toledo

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Castorinal, F., Censi, P., Comin-Chiaramonti, P. et al. Carbonatites from Eastern Paraguay and genetic relationships with potassic magmatism: C, O, Sr and Nd Isotopes. Mineralogy and Petrology 61, 237–260 (1997). https://doi.org/10.1007/BF01172487

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