Oxygen isotope ensemble reveals Earth’s seawater, temperature, clay mineral and carbon cycle history
Автор: Virtual Seminars in Precambrian Geology
Загружено: 2025-06-05
Просмотров: 311
Oxygen isotope ensemble reveals Earth’s seawater, temperature, clay mineral and carbon cycle history
Terry Isson
University of Waikato
Earth’s persistent habitability since the Archean remains poorly understood. Using an oxygen isotope ensemble approach—comprising shale, iron oxide, carbonate, silica, and phosphate records—it is possible to reconcile a multi-billion-year history of seawater δ18O, temperature, and marine and terrestrial clay abundance. The results reveal a rise in seawater δ18O and a temperate Proterozoic climate distinct to interpretations of a hot early Earth, indicating a strongly buffered climate system. Precambrian sediments are enriched in marine authigenic clay, with prominent reductions occurring in concert with Paleozoic and Cenozoic cooling, the expansion of siliceous life, and radiation of land plants. This supports the notion that shifts in the locus and extent of clay formation contributed to seawater 18O enrichment, clement early Earth conditions, major climate transitions, and climate stability via the reverse weathering feedback.
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