All articles tagged with #geochemical evidence
This study presents evidence for a significant two-billion-year transition in Earth's surface oxygen levels, highlighting key geochemical markers and models that trace the evolution of atmospheric oxygen from the Proterozoic era to the present, revealing episodic oxygenation events and their links to biological and environmental changes.
A new study suggests that a comet impact may have triggered the Younger Dryas cooling period 12,800 years ago, supported by geochemical evidence from ocean sediment cores, though skepticism remains among scientists.
Geochemical evidence obtained from Earth's oldest-known rocks, found in northern Canada, challenges previous theories about the early history of plate tectonics. The study reveals that there is no evidence of surface material recycling in the rocks dating back to 4 billion years ago, suggesting that subduction and plate tectonics may not have operated as they do today. However, a distinct shift in silicon and oxygen isotopes at 3.8 billion years ago indicates a possible change in Earth's geodynamics, potentially marking the onset of plate subduction. The findings shed new light on the early tectonic processes that shaped our planet.