Strontium isotopes and sedimentology of a marine Triassic succession (upper Ladinian) of the westernmost Tethys, Spain
| Contribuinte(s) |
MEC. Instituto de Geociencias, CSIC-UCM |
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| Data(s) |
20/10/2016
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| Resumo |
Chemical Stratigraphy, or the study of the variation of chemical elements within sedimentary sequences, has gradually become an experienced tool in the research and correlation of global geologic events. In this paper 87Sr/ 86Sr ratios of the Triassic marine carbonates (Muschelkalk facies) of southeast Iberian Ranges, Iberian Peninsula, are presented and the representative Sr-isotopic curve constructed for the upper Ladinian interval. The studied stratigraphic succession is 102 meters thick, continuous, and well preserved. Previous paleontological data from macro and micro, ammonites, bivalves, foraminifera, conodonts and palynological assemblages, suggest a Fassanian-Longobardian age (Late Ladinian). Although diagenetic minerals are present in small amounts, the elemental data content of bulk carbonate samples, especially Sr contents, show a major variation that probably reflects palaeoenvironmental changes. The 87Sr/86Sr ratios curve shows a rise from 0.707649 near the base of the section to 0.707741 and then declines rapidly to 0.707624, with a final values rise up to 0.70787 in the upper part. The data up to meter 80 in the studied succession is broadly concurrent with 87Sr/86Sr ratios of sequences of similar age and complements these data. Moreover, the sequence stratigraphic framework and its key surfaces, which are difficult to be recognised just based in the facies analysis, are characterised by combining variations of the Ca, Mg, Mn, Sr and CaCO3 contents La Quimioestratigrafía o el estudio de la distribución geoquímica de los elementos y sus variaciones en las secuencias sedimentarias, se ha convertido en una herramienta de interés para la investigación y correlación de eventos geológicos globales. En este trabajo, se analizan los valores de la relación isotópica 87Sr/86Sr de los carbonatos marinos en facies Muschelkalk del Triásico del sureste de la Cordillera Ibérica que han sido atribuidos al Ladiniense superior. La sucesión tiene un espesor de 102 m, es continua y está muy bien preservada. Los datos paleontológicos de estudios previos basados en macrofauna de ammonites y bivalvos, y en microfauna de foraminíferos, conodontos y asociaciones palinológicas, sugieren un intervalo de tiempo Fassaniensen-Longobardiense. El análisis detallado de la petrología y geoquímica de los carbonatos, demuestra que la mayor parte de la sucesión no ha sufrido una diagénesis intensa. La variación vertical de las relaciones isotópicas del contendido en Sr indica un cambio paleoambiental significativo en las características químicas del mar triásico del Tetis para este sector. La relación 87Sr/86Sr es de 0.707649 en la base de la sección, aumenta ligeramente en sentido vertical hasta valores de 0,707741 para disminuir rápidamente a 0,707624. En el techo de la serie las cantidades aumentan de nuevo hasta 0,70787. Los valores obtenidos de la relación 87Sr/86Sr en los primeros 80 metros de la sucesión, coinciden con las relaciones obtenidas en secuencias de la misma edad en otros ámbitos del mar del Tetis. La combinación de las variaciones de elementos traza de Ca, Mg, Mn y Sr y del contenido total CaCO3 ha permitido además, caracterizar geoquímica y mineralógicamente el análisis secuencial y el reconocimiento de las superficies que limitan las secuencias deposicionales para la región estudiada. |
| Formato |
application/pdf |
| Identificador |
http://revistas.ucm.es/index.php/JIGE/article/view/51642 10.5209/rev_JIGE.2016.v42.n2.51642 |
| Publicador |
Ediciones Complutense |
| Relação |
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| Fonte |
Journal of Iberian Geology; Vol 42, No 2 (2016); 171-186 Journal of Iberian Geology; Vol 42, No 2 (2016); 171-186 |
| Palavras-Chave | #Geology; Chemostratigraphy #Strontium isotope; Chemostratigraphy; Muschelkalk; Middle Triassic; Iberian Ranges #Isótopos de estroncio; Quimioestratigrafia; Muschelkalk; Triásico medio; Cordillera Ibérica |
| Tipo |
info:eu-repo/semantics/article Artículo revisado por pares info:eu-repo/semantics/publishedVersion |
