The Marine OS Isotope Record of the Late Eocene And Early Oligocene

摘要PIs建议在DSDP站点522和574以及意大利亚平宁地区的一个陆地站点收集1870年代/1880年代和更有限的8180年代的记录，以证实其初步数据，即1870年代/1880年代在边界上出现了一个下降，然后急剧增加。这一分界线也标志着始新世漫长暖期后全球气候开始恶化（变冷）。这种变冷的原因目前还不确定，并且有许多可能的原因引起争议。这项研究可以帮助缩小原因，因为o记录将与6180年在522地点的冰量记录进行比较。此外，陆地部分将用于比较Os记录与能够降低全球海洋1170S/I”Os的行星际尘埃颗粒（IDP）通量的独立He代理。这项新的研究将确定1170S/1110s的偏移是否是一个全球性事件，并将有助于缩小其原因的可能性。它还将开发Os同位素作为大陆风化代理的可能潜力。

AbstractThe PIs propose to collect records of 1870S/1880s and more limited 8180 from DSDP sites522 and 574 plus an on-land site in the Italian Appenines across the late Eocene-Oligocene boundary to confirm their preliminary data that show a dip and then a dramaticincrease in 1870S/I 880s across the boundary. This boundary also marks the beginning ofthe deterioration (cooling) in global climate after the long Eocene warm period. The cause of this cooling is presently undetermined and controversial with many possible causes. This research could help narrow the causes because the Os record will be compared with 6180 record of ice volume at site 522. In addition, the on-land section will be used to compare the Os record with an independent He proxy for interplanetary dust particle (IDP) flux that is capable of lowering global ocean 1170S/I "Os. The new study will establish whether the excursion Of 1170S/1110s is a global event or not, and will help to narrow the possibilities for its cause. It will also develop the possible potential of Os isotopes as a proxy for continental weathering.