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08:55
Making a Geologic Cross Section
Published on: April 30, 2023
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El caos del Sistema Solar y la edad límite Paleoceno-Eoceno limitada por la geología y la astronomía
Richard E Zeebe1, Lucas J Lourens2
1School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, 1000 Pope Road, MSB 629, Honolulu, HI 96822, USA. zeebe@soest.hawaii.edu.
Science (New York, N.Y.)
|August 31, 2019
Resumen
Los datos astronómicos ahora extienden la astrocronología más allá de hace 50 millones de años. Nuevos hallazgos revelan el Máximo Térmico Paleoceno-Eoceno
Área de la Ciencia:
- Ciencias de la Tierra
- La astronomía
- Paleoclimatología
Sus antecedentes:
- Los cálculos astronómicos son cruciales para la ciclostratigrafía y la astrocronología.
- Las escalas de tiempo astronómicas actuales están limitadas a los últimos 50 millones de años debido a discrepancias en los cálculos orbitales.
- La extensión de esta escala de tiempo proporciona información crítica sobre el clima antiguo de la Tierra y la dinámica orbital.
Objetivo del estudio:
- Desarrollar una nueva escala de tiempo astronómico que se extienda más allá de 50 millones de años antes del presente.
- Para refinar la edad del límite Paleoceno-Eoceno y determinar la duración del Máximo Térmico Paleoceno-Eoceno (PETM).
- Para investigar los disparadores orbitales y la duración del PETM.
Principales métodos:
- Integración de datos geológicos con una nueva solución astronómica (ZB18a).
- Modelado astronómico de alta resolución para reconstruir las configuraciones orbitales del pasado.
- Datación precisa de las secuencias sedimentarias para correlacionarlas con los ciclos astronómicos.
Principales resultados:
- Excepcional acuerdo entre los datos geológicos y la solución astronómica ZB18a de hace 58 a 53 millones de años.
- Establecimiento de una nueva astrocronología absoluta que se extiende hasta 58 millones de años antes del presente.
- Determinación de una nueva edad límite Paleoceno-Eoceno a 56,01 ± 0,05 millones de años antes del presente.
- El inicio del PETM coincidió con un máximo de excentricidad de 405 mil años, lo que sugiere un disparador orbital.
- Se determinó que la duración del PETM era de 170 ± 30 mil años.
Conclusiones:
- La nueva solución astronómica permite una astrocronología sin precedentes y precisa.
- El forzamiento orbital probablemente jugó un papel importante en el desencadenamiento del PETM.
- El Sistema Solar experimentó una transición de resonancia caótica hace unos 50 millones de años, impactando las frecuencias fundamentales.
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