Oxygen isotope ensemble reveals Earth's seawater, temperature, and carbon cycle history

• 成果类型: Article
• 署名作者: Isson, Terry; Rauzi, Sofia
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-9216
• DOI: 10.1126/science.adg1366
• 发表日期: 2024-02-09
• 页码: 666-670
• 关键词: clay mineral formation; apatite delta-o-18 values; scale glacio-eustasy; paleozoic ice-age; a-type granites; conodont apatite; hydrogen isotope; stable-isotope; triple oxygen; CLIMATE-CHANGE

摘要

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-we reconcile a multibillion-year history of seawater delta O-18, temperature, and marine and terrestrial clay abundance. Our results reveal a rise in seawater delta O-18 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 the radiation of land plants. These findings support the notion that shifts in the locus and extent of clay formation contributed to seawater O-18 enrichment, clement early Earth conditions, major climate transitions, and climate stability through the reverse weathering feedback.