Earliest Oligocene Climate Transition and the Dynamics of Continental Ice Sheet Evolution: Constraints from High Resolution (10 4 Yr) Deep-Sea Foraminifera

PI将研究稳定碳和 浮游和底栖有孔虫氧同位素含量 从两个始新世/渐新世序列（DSDP核心522）在 南大西洋和南部的一个核心（DSDP核心748） 印度洋，以确定是否早渐新世冰盖上 南极洲的盛衰与1970年 新第三纪如果是这样，信号是相同的还是不同的， 振幅/频率;即最早的渐新世记录 展示米兰科维奇的rhthyms？这项研究是由促进 古近系地层学，特别是化学和 磁性地层学

The PI's will study the variation of stable carbon and oxygen isotope contents in planktonic and benthic foraminifera from two Eocene/Oligocene sequences (DSDP core 522) in the South Atlantic and one core (DSDP core 748) in the southern Indian Ocean to determine if early Oligocene ice-sheets on Antarctica displayed the same waxing and waning as seen during the Neogene. If so, was the signal the same or different in amplitude/frequency; i.e. does tyhe earliest Oligocene record display Milankovitch rhthyms? This study is facilitated by the improvement in Paleogene stratigraphy, particularly chemo-and- magneto-stratigraphies.