ODP 926¶

ODP Site 926 was drilled at the Ceara Rise in the western equatorial Atlantic Ocean (3°43’N, 42°54’W) during Leg 154 to investigate late Cenozoic changes in the Atlantic Ocean (Curry et al., 1995). The site has been extensively analyzed using cyclostratigraphy (Shackleton & Crowhurst, 1997; Shackleton et al., 1999; Zeeden et al., 2013; Wilkens et al., 2017), and its astronomically tuned timescale serves as a key reference for several bioevents in the Geological Time Scale 2020 (Backman & Raffi, 1997; Wade et al., 2011; Raffi et al., 2020).

This study focuses on the 5–10 Ma interval, where the sedimentary record shows a clear astronomical imprint and minimal uncertainty in orbital parameters, making it ideal for comparing extracted eccentricity curves with established astronomical solutions (Laskar et al., 2004; Laskar et al., 2011a).

Files in the data Folder¶

ODP_926.txt: Data of the ODP 926 site.
U926_AgeModel_Wilkens_etal_2017.txt: Age model data from Wilkens et al. (2017).
La2010d_ecc3L.txt: Astronomical solution data (eccentricity component).

Execute the Example¶

Note

The folder examples has to bee in the same directory as the AstroGeoFit_tool.py file. If not, this will not work.

To run the example, open a terminal in the AstroGeoFit folder. Once this is open execute the following

python AstroGeoFit_tool.py --odp_926

This command will execute the significance test, the genetic algorithm fitting, the MCMC, and the MCMC weights calculation.

If you only want to run specific components (e.g., the genetic algorithm fitting and the MCMC), you can use:

python AstroGeoFit_tool.py --odp_926 -fit -mcmc

The full list of execution options can be found in AstroGeoFit Script Execution.

Visualization of the Results¶

To visualize the results, you can use the two Jupyter notebooks provided. To obtain the results of the ODP_926 data, just modify the variable configuration_file_path in the following way:

configuration_file_path = "odp_926"

And then the visualization notebook will be ready to be executed.

For a detailed guide on using the notebooks and interpreting the figures, please refer to Visualization of the Results Guide.