An ∼60-Million-Year Periodicity Is Common to Marine87Sr/86Sr, Fossil Biodiversity, and Large-Scale Sedimentation: What Does the Periodicity Reflect?
We find that the marine 87Sr/86Sr record shows a significant periodicity of 59.3 \pm 3 Myr. The 87Sr/86Sr record is 171° \pm 12°out of phase with a 62 (\pm 3) Myr periodicity previously reported in the record of marine-animal diversity. These periodicities are close to 58 (\pm 4) Myr cycles found for the number of gap-bounded sedimentary carbonate packages of North America We propose that these periodicities reflect the operation of a periodic "pulse of the Earth" in large-scale, Earth processes. These may be linked to mantle or plate-tectonic events, possibly uplift, which affects Earth's climate and oceans, and so the geochemistry, sedimentation, and biodiversity of the marine realm. Alternately, they may be linked to oscillation of the solar system normal to the plane of the galaxy.
Journal of Geology
- Pub Date:
- March 2012
- Astrophysics - Earth and Planetary Astrophysics;
- Astrophysics - Galaxy Astrophysics;
- Physics - Biological Physics;
- Physics - Geophysics;
- Quantitative Biology - Populations and Evolution
- 21 pages, including supplement