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Artículo

C and Sr isotopic evolution of carbonate sequences in NW Argentina: Implications for a probable Precambrian-Cambrian transition

Sial, A. N.; Ferreira, V. P.; Toselli, Alejandro JoseIcon ; Aceñolaza, Florencio GilbertoIcon ; Pimentel, M. M.; Parada, Marcela Alejandra; Alonso, Ricardo NarcisoIcon
Fecha de publicación: 01/09/2001
Editorial: Northeastern Science Foundation Inc
Revista: Carbonates And Evaporites
ISSN: 0891-2556
e-ISSN: 1878-5212
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Geología

Resumen

Upper Precambrian-Lower Cambrian sequences in the Tucuman, Salta and Jujuy provinces, NW Argentina, comprise sandstone, slate, conglomerate and black limestone (Las Tienditas/Volcan Fms.) with abundant Vendian/Tommotian trace fossils in the clastic facies rocks. The Precordillera basin, San Juan province, represents a continuous carbonate sequence belonging to the Lower to Middle Cambrian La Laja Fm. The Pie-de-Palo Range, Pampean Range, characterized by carbonates intercalated with greenschist/amphibolite facies metaclastic rocks, forms a part of the Precordillera basement. The δ13C values in carbonates of the Las Tienditas Fm. show a gradual decrease from the base (+3.4 ‰PDB) to the top with a minimum of -1.6‰ observed at ∼15m from the top, the latter having a higher clay content. Carbonates in a 700m thick section within La Laja Fm. is marked by a slightly positive δ13C values at the base (marly) with a negative anomaly (-2.0‰) at ∼20 m above, followed by a small positive anomaly (+0.5‰) ∼100 m from the base. All the values above this point are around -0.5‰ with a negative anomaly (-2.0‰) recorded at ∼240m above the base. Seawater 87Sr/86Sr values define a non-monotonic increase (0.70870 - 0.71082) through the carbonates in Las Tienditas Fm. while the La Laja Fm carbonates vary from 0.70926 to 0.71030, with higher values at the base. C and Sr isotopes, thus suggest that the Las Tienditas carbonates record the Precambrian-Cambrian transition (∼15m from the top of studied section). The same is also evident at ∼30 m from the base of the La Laja Fm. The narrow range of δ13C variation (-1.4 to + 1.3‰) and 87Sr/86Sr in the 0.709-0.710 range for the Caucete Group carbonates of the Pie-de-Palo Range, although unequivocally, appear to be in consonance with a Vendian to Tommotian age, reinforced by the presence of the trace fossils Didymaulichnus and Gordia.
Palabras clave: ARGENTINA , C & SR ISOTOPES , CARBONATES , NEOPROTEROZOIC-CAMBRIAN
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/128856
DOI: https://doi.org/10.1007/BF03175832
URL: https://link.springer.com/article/10.1007%2FBF03175832
Colecciones
Articulos(CCT - SALTA-JUJUY)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - SALTA-JUJUY
Citación
Sial, A. N.; Ferreira, V. P.; Toselli, Alejandro Jose; Aceñolaza, Florencio Gilberto; Pimentel, M. M.; et al.; C and Sr isotopic evolution of carbonate sequences in NW Argentina: Implications for a probable Precambrian-Cambrian transition; Northeastern Science Foundation Inc; Carbonates And Evaporites; 16; 2; 1-9-2001; 141-152
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