Silicate weathering, land plants, and cooling in the late Silurian and early Devonian
Avila TD, Saltzman MR, Griffith EM, Joachimski M (2025)
Publication Type: Journal article
Publication year: 2025
Journal
DOI: 10.1144/jgs2023-148
Abstract
The development of terrestrial vegetation and its impact on silicate weathering is hypothesized to have driven multiple cooling events throughout the Paleozoic. One such event is the 8 to 10˚C cooling observed from the late Silurian through early Devonian (c.a. 420 to 385 Ma). Chemical weathering of Ca- and Mg-bearing silicate minerals and the subsequent trapping of carbon in marine carbonates are a sink for atmospheric CO2 on multimillion-year time scales. The strontium isotopic ratio (87Sr /86Sr) of seawater acts as a geochemical proxy for this process. In this study, we present new Silurian to Devonian 87Sr/86Sr data paired with oxygen isotopes (
18O; a proxy for paleotemperature and ice volume) from conodont apatite. The two datasets inflect in the late Silurian to early Devonian, suggesting a connection between enhanced basaltic weathering (leading to lower 87Sr/86Sr) and cooling (increasing
18O). The spread of terrestrial plants likely drove a significant portion of the enhanced basaltic weathering, which would have driven cooling, in addition to coeval tectonic changes in the Pridoli Epoch (422.7 to 419.0 Ma) and Lochkovian Age that further enhanced weathering and drawdown of atmospheric CO2 (419.0 to 412.4 Ma).
Authors with CRIS profile
Involved external institutions
United States (USA) (US)How to cite
APA:
Avila, T.D., Saltzman, M.R., Griffith, E.M., & Joachimski, M. (2025). Silicate weathering, land plants, and cooling in the late Silurian and early Devonian. Journal of the Geological Society. https://doi.org/10.1144/jgs2023-148
MLA:
Avila, Teresa D., et al. "Silicate weathering, land plants, and cooling in the late Silurian and early Devonian." Journal of the Geological Society (2025).
BibTeX: Download