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

摘要PI建议从DSDP站点522和574收集19世纪70年代/19世纪80年代和更有限的8180的记录，加上意大利古陆的一个陆地站点，跨越始新世晚期-渐新世边界，以确认他们的初步数据，显示19世纪70年代/19世纪80年代跨越边界的下降，然后急剧增加。这条分界线也标志着在漫长的始新世温暖期之后，全球气候开始恶化（变冷）。这种冷却的原因目前还不确定，有许多可能的原因。这项研究可以帮助缩小原因，因为Os记录将与522号站点的6180个冰量记录进行比较。此外，陆地部分将用于将Os记录与能够降低全球海洋1170 S/1110 s的行星际尘埃粒子（IDP）通量的独立He代理进行比较。新研究将确定1170 S/1110 s的漂移是否是全球事件，并将有助于缩小其原因的可能性。它还将开发锇同位素作为大陆风化代用指标的可能潜力。

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.