Geologic constraints on the chaotic diffusion of the solar system

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doi: 10.1130/G20750.1
Author(s): Palike, Heiko; Laskar, Jacques; Shackleton, Nicholas J.
Author Affiliation(s): Primary:
Stockholm University, Department of Geology and Geochemistry, Stockholm, Sweden
Other:
CNRS, France
University of Cambridge, United Kingdom
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 32(11), p.929-932. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. Includes appendix; with GSA Data Repository Item 2004152. 27 refs.; illus.
Summary: The correlation of Earth's orbital parameters with climatic variations has been used to generate astronomically calibrated geologic time scales of high accuracy. However, because of the chaotic behavior of the solar system, two initially close calculations of Earth's orbit diverge exponentially and have a large uncertainty beyond several million years in the past. This chaotic behavior is related to a combination of angles in the precession motion of the orbits of Earth and Mars, θ, which currently is in resonance. How long θ stays in libration critically depends on the dynamical model and initial conditions for the solar system. Here we show that geologic data can differentiate between astronomical solutions that do and do not exhibit a transition in θ since 40 Ma and that sediments can thus provide a history for the evolution of θ. We find that the chaotic transition of θ from libration to circulation did not occur after ca. 30 Ma. We can thus constrain the chaotic diffusion of the solar system in the past, and our results provide new and challenging constraints for astronomical models.
Year of Publication: 2004
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Calibration; Cenozoic; Chaos; Climate forcing; Controls; Earth; Eccentricity; Equatorial Atlantic; Equatorial Pacific; Leg 154; Leg 199; Marine sediments; Mars; Miocene; Motions; Neogene; ODP Site 1218; ODP Site 926; ODP Site 929; Ocean Drilling Program; Oligocene; Orbital forcing; Orbits; Pacific Ocean; Paleoclimatology; Paleogene; Planets; Precession; Sediments; Solar system; Terrestrial planets; Tertiary; Theoretical models
Coordinates: N085300 N085300 W1352200 W1352200
N034309 N034309 W0425430 W0425430
N055834 N055834 W0434423 W0434423
Record ID: 2004084070
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