Análisis de elementos traza en braquiópodos del Jurásico Inferior del Paleomargen Sud-Ibérico (SE de España). Correlación con las señales bióticas e implicaciones ambientales en torno al Evento de Extinción Masiva del Toarciense inferior

Autores/as

DOI:

https://doi.org/10.3989/egeol.44385.604

Palabras clave:

Braquiópodos, Análisis paleoecológico, Elementos traza, Tethys Occidental, Extinción Pliensbaquiense-Toarciense

Resumen


En el Jurásico Inferior se registran diversos eventos críticos que influyeron significativamente en los ecosistemas marinos del Tethys occidental. Entre las comunidades bentónicas, en el Paleomargen Sudibérico, los braquiópodos se vieron particularmente afectados por dichos eventos. El episodio tectono-sedimentario distensivo asociado a la apertura del proto-Atlántico conllevó el colapso de las amplias plataformas someras imperantes en el Tethys hasta el Sinemuriense superior-Pliensbaquiense basal, con la consiguiente reorganización de los ecoespacios faunísticos. Posteriormente, el evento de extinción registrado en el Toarciense inferior, trajo consigo importantes alteraciones en el ciclo del carbono así como el desarrollo de condiciones anóxicas que afectaron principalmente a las comunidades bentónicas. En el dominio Subbético, la dinámica poblacional de los braquiópodos coincidió con estos importantes eventos de perturbación ambiental. Se ha analizado la impronta geoquímica registrada en conchas de braquiópodos del Subbético oriental, revelando una clara sincronía entre las oscilaciones del contenido en elementos traza, las tendencias globales en el ciclo del C y del O y la diversidad de la braquiofauna en torno a dichos eventos críticos, lo que permite validar modelos globales y regionales relacionados tanto con el evento de rifting incipiente de las plataformas someras en el Sinemuriense-Pliensbachiense, como con la crisis biótica global en torno al Toarciense inferior. En la renovación faunística verificada para el tránsito Sinemuriense-Pliensbachiense y para el evento de extinción del Toarciense, los metales traza sensibles a las condiciones redox, la concentración de REE y el contenido en Fe en las conchas de braquiópodos muestran excursiones positivas. Esta tendencia, junto a los patrones de diversidad de los braquiópodos, los bajos valores de TOC y las evidencias sedimentarias, sugieren que, en esta región, la anoxia debió representar un factor secundario como causa de estrés ambiental para la fauna bentónica. En cambio, se postula que el progresivo aumento de la temperatura jugó un papel determinante en las cuencas marginales del Tethys occidental, como se demuestra al correlacionar los principales eventos de renovación y sustitución faunística con las paleotemperaturas de las plataformas peri-ibéricas. Los cambios en la paleoproductividad, los aportes continentales y posibles contribuciones hidrotermales se relacionan asimismo con las oscilaciones de determinados elementos traza y se interpretan, por tanto, como factores coadyuvantes desencadenantes de estos bioeventos del Jurásico Inferior en el Tethys occidental.

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Publicado

2021-12-15

Cómo citar

Baeza-Carratalá, J. F., Reolid, M., Giannetti, A., Benavente, D., & Cuevas-González, J. (2021). Análisis de elementos traza en braquiópodos del Jurásico Inferior del Paleomargen Sud-Ibérico (SE de España). Correlación con las señales bióticas e implicaciones ambientales en torno al Evento de Extinción Masiva del Toarciense inferior. Estudios Geológicos, 77(2), e141. https://doi.org/10.3989/egeol.44385.604

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Ministerio de Economía y Competitividad
Números de la subvención CGL2015-66604-R;CGL2015-66835-P;PID2019-105537RB-100

Junta de Andalucía
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Universidad de Alicante
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Universidad de Jaén
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