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 Parana Basin (SE Brazil), were affected by metasomatic events distinct in time and composition.

Carbonatites from Eastern Paraguay and genetic relationships with potassic magmatism: C, O, Sr and Nd isotopes / Castorina, Francesca; P., Censi; P., COMIN CHIARAMONTI; E. M., Piccirillo; A. A., Neto; Gomes, C. B.; TIR de, Almeida; S., Speziale; Toledo, M. C. M.. - In: MINERALOGY AND PETROLOGY. - ISSN 0930-0708. - STAMPA. - 61:1-4(1997), pp. 237-260. [10.1007/BF01172487]

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

CASTORINA, Francesca;
1997

Abstract

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 Parana Basin (SE Brazil), were affected by metasomatic events distinct in time and composition.
RARE-EARTH ELEMENTS; GEOCHEMICAL CHARACTERISTICS; MANTLE; OXYGEN; FRACTIONATION; BRAZIL; METASOMATISM; EVOLUTION; XENOLITHS; COMPLEXES
01 Pubblicazione su rivista::01a Articolo in rivista
Carbonatites from Eastern Paraguay and genetic relationships with potassic magmatism: C, O, Sr and Nd isotopes / Castorina, Francesca; P., Censi; P., COMIN CHIARAMONTI; E. M., Piccirillo; A. A., Neto; Gomes, C. B.; TIR de, Almeida; S., Speziale; Toledo, M. C. M.. - In: MINERALOGY AND PETROLOGY. - ISSN 0930-0708. - STAMPA. - 61:1-4(1997), pp. 237-260. [10.1007/BF01172487]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/69204
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