Petrology and geochemistry of Carboniferous siliciclastics from the Argentine Frontal Cordillera: A test of methods for interpreting provenance and tectonic setting

Petrological and geochemical characteristics of sandstones and shales from the Carboniferous Cerro Agua Negra Formation (Río Blanco basin, western Argentina) are discussed. The sandstones are mostly feldspathic litharenites with subordinate litharenites and lithic arkoses, and their modal compositio...

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Autor principal: Spalletti, L.A
Otros Autores: Limarino, C.O, Piñol, F.C
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Publicado: 2012
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100 1 |a Spalletti, L.A. 
245 1 0 |a Petrology and geochemistry of Carboniferous siliciclastics from the Argentine Frontal Cordillera: A test of methods for interpreting provenance and tectonic setting 
260 |c 2012 
270 1 0 |m Spalletti, L.A.; Centro de Investigaciones Geológicas, Calle 1, No. 644, B1900TAC, La Plata, Argentina; email: spalle@cig.museo.unlp.edu.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a Petrological and geochemical characteristics of sandstones and shales from the Carboniferous Cerro Agua Negra Formation (Río Blanco basin, western Argentina) are discussed. The sandstones are mostly feldspathic litharenites with subordinate litharenites and lithic arkoses, and their modal compositions indicate two major sources. The first represents a recycled orogen and can be identified as the Protoprecordillera, a N-S trending mountainous area that separated the Paganzo and Río Blanco basins and that was a positive element at least up until the end of the Carboniferous. The second was further east, in the Sierras Pampeanas terrane. It consisted of a variety of metasedimentary and felsic plutonic crystalline rocks. The Protoprecordillera must have been crossed by transverse valleys that facilitated the transfer of Pampean terrigenous material towards the Río Blanco basin. A lack of volcanogenic sand suggests that the basin was open towards proto-Pacific in the west, rather than being separated from it by a magmatic arc as previously suggested.Bulk geochemical analysis of different lithological types (arenites, wackes and shales) demonstrates a strong relationship between texture and chemical composition of the rocks, even taking into account the immobile elements. The largest differences are between shales and arenites, while the wackes have intermediate compositions. The CIA (chemical index of alteration) indicates partial remobilisation of oxides from source rocks and enrichment of aluminium and potassium in the shales, which reflects their potassic clay mineral composition. Overall, siliciclastics of the Cerro Agua Negra Formation have a similar composition to the upper continental crust (with slight net enrichment of SiO 2 in the arenites and of Al 2O 3 in the shales). Rare earth element profiles reflect terrigenous contributions, since they are enriched in light-REE, have a pronounced negative Eu anomaly and a relative depletion of the heavy-REE. The results show that discrimination plots commonly employed to infer provenance and tectonic setting from siliclastics are compromised where bulk chemical composition is strongly dependent on grain size and sorting. © 2011 Elsevier Ltd.  |l eng 
536 |a Detalles de la financiación: Ministerio de Educación y Cultura 
536 |a Detalles de la financiación: Ministerio de Ciencia e Innovación, MICINN 
536 |a Detalles de la financiación: Institut Nacional d'Educacio Fisica de Catalunya, Generalitat de Catalunya 
536 |a Detalles de la financiación: The authors wish to express their gratefulness to Pedro Busquets and Miguel López by their helpful comments. Special thanks to Jim Hendry whose thoughtful comments and review helped improve the manuscript. We acknowledge constructive suggestions made by two anonymous reviewers. The work was supported by grant CGL2009-13706-C03-03 ( Ministerio de Educación y Ciencia and Ministerio de Ciencia e Innovación, Spain ) and by the Grup de Qualitat 2009-SGR-1198 (Generalitat de Catalunya, Spain). Appendix 
593 |a Centro de Investigaciones Geológicas, Calle 1, No. 644, B1900TAC, La Plata, Argentina 
593 |a Departamento de Geología, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina 
593 |a Departamento de Estratigrafía, Paleontología y Geociencias Marinas, Facultad de Geología, Universidad de Barcelona, C/Marti i Franqués s/n, E-08028 Barcelona, Spain 
593 |a Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina 
651 4 |a ARGENTINA 
651 4 |a ARGENTINA 
690 1 0 |a CARBONIFEROUS 
690 1 0 |a RIO BLANCO BASIN 
690 1 0 |a SANDSTONE PETROLOGY 
690 1 0 |a SEDIMENTARY GEOCHEMISTRY 
690 1 0 |a CARBONIFEROUS 
690 1 0 |a CHEMICAL ALTERATION 
690 1 0 |a CHEMICAL COMPOSITION 
690 1 0 |a CONTINENTAL CRUST 
690 1 0 |a FELDSPAR 
690 1 0 |a FELSIC ROCK 
690 1 0 |a LITHOLOGY 
690 1 0 |a METASEDIMENTARY ROCK 
690 1 0 |a PETROLOGY 
690 1 0 |a PLUTONIC ROCK 
690 1 0 |a PROVENANCE 
690 1 0 |a RARE EARTH ELEMENT 
690 1 0 |a REMOBILIZATION 
690 1 0 |a SANDSTONE 
690 1 0 |a SEDIMENT CHEMISTRY 
690 1 0 |a SILICICLASTIC DEPOSIT 
690 1 0 |a SOURCE ROCK 
690 1 0 |a TECTONIC SETTING 
690 1 0 |a BLANCO BASIN 
700 1 |a Limarino, C.O. 
700 1 |a Piñol, F.C. 
773 0 |d 2012  |g v. 36  |h pp. 32-54  |p J. South Am. Earth Sci.  |x 08959811  |w (AR-BaUEN)CENRE-1080  |t Journal of South American Earth Sciences 
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856 4 0 |u https://doi.org/10.1016/j.jsames.2011.11.002  |y DOI 
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