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Las fluctuaciones a largo plazo del nivel del mar impulsadas por la dinámica de las cuencas oceánicas.

R Dietmar Müller1, Maria Sdrolias, Carmen Gaina

  • 1EarthByte Group, School of Geosciences, Building H11, University of Sydney, Sydney, NSW 2006, Australia. dietmar@geosci.usyd.edu.au

Science (New York, N.Y.)
|March 8, 2008
PubMed
Resumen
Este resumen es generado por máquina.

El nivel del mar en el Cretácico tardío fue mucho más alto de lo que se pensaba anteriormente, alcanzando 170 metros por encima de los niveles actuales. Este entendimiento revisado concilia los datos geológicos con las reconstrucciones de las cuencas oceánicas, explicando las discrepancias en las estimaciones anteriores del nivel del mar.

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Área de la Ciencia:

  • Geología Geología Geología.
  • La paleoceanografía es la paleoceanografía.
  • La geofísica es la geofísica.

Sus antecedentes:

  • Las estimaciones del nivel del mar del Cretácico tardío varían ampliamente, de 40 a 250 metros por encima de los niveles actuales.
  • Existen discrepancias entre las estimaciones basadas en los márgenes continentales (por ejemplo, Nueva Jersey) y las reconstrucciones de cuencas oceánicas.

Objetivo del estudio:

  • Para modelar un nivel del mar más preciso del Cretácico Tardío.
  • Para conciliar diferentes estimaciones del nivel del mar.
  • Investigar los mecanismos que causan el hundimiento en los márgenes continentales.

Principales métodos:

  • Asimilar datos geofísicos marinos en las reconstrucciones de antiguas cuencas oceánicas.
  • Utilizando un modelo de convección del manto para evaluar el hundimiento tectónico.
  • Comparando los niveles del mar modelados con la evidencia geológica.

Principales resultados:

  • Modelado el nivel del mar del Cretácico tardío a 170 metros (85 a 270 metros) por encima de la actual.
  • Se identificó un hundimiento significativo (105 a 180 metros) en la región de Nueva Jersey durante más de 70 millones de años.
  • El hundimiento se atribuye al movimiento de América del Norte sobre la placa Farallon subducida.

Conclusiones:

  • El estudio proporciona una estimación reconciliada del nivel del mar en el Cretácico Tardío.
  • El hundimiento tectónico es un factor clave para explicar las discrepancias en los datos del nivel del mar basados en márgenes.
  • La dinámica del manto y la tectónica de placas influyen significativamente en los registros a largo plazo del nivel del mar.