The drawdown of atmospheric CO2 likely triggered Antarctic glaciation during the Eocene‐Oligocene Transition (34 Ma). Accurately constraining this shift from “greenhouse” to an “icehouse” climate is essential for understanding global carbon cycle dynamics. However, conventional proxies often lack the sensitivity to capture the earliest, localized phases of continental ice‐sheet development. In this study, we combined radiogenic hafnium and neodymium isotopes on marine sediments from Ocean Drilling Program Site 689D to track changes in silicate weathering regimes and isolate the enhanced physical weathering signal uniquely associated with glacial grinding. By analyzing the detrital sortable silt fraction, we identified the onset of major Antarctic glaciation between 34.06 and 34.13 Ma. Additionally, our data reveal two distinct precursor glacial events occurring earlier, at approximately 34.19 and 34.41 Ma. These findings provide a more refined chronological framework for one of Earth's most significant climate shifts.
Late Pleistocene climate in the European Alps was marked by large, orbitally driven fluctuations in temperature, precipitation, and ice extent. Reconstructing mountain glaciation prior to the Last Glacial Maximum remains challenging, however, because glacial deposits are often eroded or reworked. Here we present a...
Jonathan L. Baker, Alexandre Honiat, G. Moseley et al.· Communications Earth & E...· 0 citations
The Toarcian Oceanic Anoxic Event (T-OAE, ~183 Ma) was a major hyperthermal event in the Phanerozoic, characterised by massive carbon release and widespread organic carbon burial. However, the source(s), flux, and sequestration pathways of carbon remain uncertain. Here, we assimilate globally representative carbon...
Wen-Han Chen, Yu-Yang Wu, David B. Kemp et al.· Nature Communications· 0 citations
The Early Pliocene Warmth (EPW) was one of the most recent intervals of sustained global temperatures above present, but its expression in European terrestrial environments remains poorly constrained. Here we establish a continental chronological and paleoenvironmental framework for the Camp dels Ninots maar-lake suc...
X. Bolós, O. Oms, P. Rodríguez-Salgado et al.· Scientific Reports· 0 citations
Antarctic soils, forming under cold and aridity, preserve strong geochemical and mineralogical imprints of their parent material, offering a unique natural laboratory to study early-stage pedogenesis. James Ross Island (JRI), situated in the northeastern Antarctic Peninsula, presents a strategic setting due to its semi...
Climate change is demonstrably linked to radiations, extinctions, and turnovers in the biosphere throughout the Phanerozoic (538.8 Ma to present). Here, we suggest this connection existed as early as the late Ediacaran (ca. 579−538.8 Ma), the first interval in Earth’s history to host complex macroscopic organisms, incl...
Thomas W. Wong Hearing, Benjamin H. Tindal, T. Vandyk et al.· Geological Society of Americ...· 4 citations
Hydroclimate in Portugal is influenced by the North Atlantic subtropical high‐pressure system (the Azores High) and by internal climate modes, most prominently the North Atlantic Oscillation, which may shift in position and/or intensity due to anthropogenic climate change. The development of high‐resolution paleocl...
Alaina G. Chormann, A. Wanamaker, D. Thatcher et al.· Journal of Quaternary Scienc...· 0 citations
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