Stable isotope record, opal accumulation rate and geochemistry of middle Mioc...

During the middle Miocene, Earth's climate transitioned from a relatively warm phase (Miocene climatic optimum) into a colder mode with re-establishment of permanent ice sheets...中新世中期，地球气候从相对温暖的阶段（中新世气候适宜期，Miocene climatic optimum）过渡至寒冷模式，伴随永久冰盖的重新形成……