Bulk and compound-specific δ13C and n-alkane indices in a palustrine intermontane record for assessing environmental changes over the past 320 kathe Padul Basin, Southwestern Mediterranean realm

  1. José E. Ortiz 1
  2. Trinidad Torres 1
  3. Antonio Delgado
  4. Maruja Valle 2
  5. Vicente Soler
  6. Rafael Araujo
  7. María R. Rivas 2
  8. Ramón Julià
  9. Yolanda Sánchez Palencia 1
  10. Rogelio Vega Panizo 1
  1. 1 Universidad Politécnica de Madrid
    info

    Universidad Politécnica de Madrid

    Madrid, España

    ROR https://ror.org/03n6nwv02

  2. 2 Universidad de Salamanca
    info

    Universidad de Salamanca

    Salamanca, España

    ROR https://ror.org/02f40zc51

Revista:
Journal of iberian geology: an international publication of earth sciences

ISSN: 1886-7995,  1698-6180

Año de publicación: 2021

Volumen: 47

Número: 4

Páginas: 625-639

Tipo: Artículo

DOI: 10.1007/S41513-021-00175-Y DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Journal of iberian geology: an international publication of earth sciences

Resumen

Proporcionamos información valiosa sobre la evolución paleoambiental de la región Mediterráneo suroccidental durante los últimos ca. 320 ka a través del estudio de biomarcadores del registro continental continuo Cuaternario más largo de la Península Ibérica. El contenido de n-alcanos y los valores de δ13C de estos lípidos se midieron en 300 muestras tomadas de los 55 m superiores del registro de la cuenca de Padul. La señal δ13C de los n-alcanos de cadena larga proporcionó información sobre la vegetación terrestre C4/C3 en la cuenca, ya que las macroftas emergentes contribuyen en menor grado a la señal de estos compuestos de mayor peso molecular. Por el contrario, los valores de δ13C de los alcanos C23 y C25 refejaron, principalmente, fases de aumento del nivel de agua, ya que las macroftas acuáticas contienen una gran proporción de estos compuestos. Los valores bajos de δ13C se atribuyeron a una marcada contribución de las plantas que utilizan la vía fotosintética C3. Los intervalos con los valores más bajos de δ13C se atribuyeron a un aporte importante de angiospermas, aunque también podrían explicarse por condiciones ambientales cambiantes o estrés ambiental, ya que se produjeron grandes cambios en δ13C en alcanos de cadena larga típicamente abundantes en plantas terrestres. Los cambios en δ13C de los alcanos de cadena media refejaron la disponibilidad limitada de CO2 inducida por la temperatura del agua, la salinidad, el pH, la productividad mejorada, la pCO2 atmosférica baja o las barreras estancadas, en lugar de la abundancia de macroftas acuáticas. Los resultados también sugieren un mayor fraccionamiento isotópico durante la síntesis de lípidos por parte de macroftas acuáticas en el MIS 7 y Holoceno, lo que produjo un aumento de los valores de δ13C en la materia orgánica y en los n-alcanos de cadena larga. Por lo tanto, el registro de δ13C resultó fundamental para determinar la contribución de las macroftas acuáticas a la composición lipídica e isotópica de la materia orgánica de los sedimentos y la reconstrucción paleoambiental. Estos resultados confrmaron que las plantas C4 contribuyeron de manera muy limitada al registro de la Cuenca del Padul. La comparación de estos resultados con el análisis de biomarcadores y polínico de la cuenca de Padul, así como con otros registros del suroeste del Mediterráneo reveló que δ13C de la materia orgánica y de los alcanos de cadena larga refejaron las oscilaciones climáticas globales del MIS 7, los Eventos Heinrich 3, 2, 1 y Younger Dryas.

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Fuente de los datos: Dialnet