Der Eozän/Oligozän Übergang aus zyklostratigraphischer Perspektive

我们计划在赤道太平洋巴尔顿期和普里亚盆期（41 - 34 Ma）建立一个完整的、天文学校准的生物、化学和磁地层学，以改进、确定和校准生物和磁地层学资料。一个精确的年龄模型对于揭示始新世/渐新世气候过渡事件的原因和后果至关重要。前提条件是将ODP Leg 199（1218至1220地点）和IODP Expedition 320 （U1331至U1334地点）的始新世中晚期和渐新世早期（磁极年代表C12n至C20n）数据（XRF岩心扫描、物理性质、生物和磁地层）进行对比和整合。修订后的合成记录将用于验证和扩展中始新世地质年标的天文定标。我们计划利用校准的高分辨率XRF核心扫描数据详细重建赤道太平洋碳酸盐补偿深度（CCD），目的是解决海洋酸度如何以及为什么随着全球始新世气候的变化而变化。在此基础上，进一步探讨了赤道太平洋碳酸盐岩聚集事件的特征，并评价了赤道太平洋沉积物中碳酸盐岩长周期旋回与天文强迫的关系。最后，我们希望在始新世/渐新世过渡时期（35 - 33 Ma），沿着从磁极时间C15n顶部到C12r底部的深度样带，为四个IODP Exp. 320站点（U1331至U1334）的大量沉积物提供新的高分辨率（轨道时间尺度）稳定同位素记录。

We plan to establish a fully integrated and astronomically calibrated bio-, chemo-, and magnetostratigraphy at the equatorial Pacific for the Bartonian and Priabonian (41 to 34 Ma) to improve, date, and intercalibrate bio- and magnetostratigraphic datums. An accurate and precise age model is critical to unravel the cause and consequences of events across the Eocene/Oligocene climatic transition. Prerequisite is the correlation and integration of ODP Leg 199 (Sites 1218 through 1220) and IODP Expedition 320 (Sites U1331 through U1334) data (XRF core scanning, physical properties, bio- and magnetostratigraphy) for the middle to late Eocene and earliest Oligocene (magnetic polarity chrons C12n to C20n). The revised composite records will be used to validate and extend the astronomical calibration of the geological timescale into the middle Eocene. We plan to reconstruct the equatorial Pacific Carbonate Compensation Depth (CCD) in detail by using calibrated high-resolution XRF core scanning data with the aim to address how and why the acidity of the oceans changed in association with shifts in the global Eocene climate. We further will explore the characteristics of the Carbonate Accumulation Events (CAE) and evaluate the relationship of the long-period carbonate cycles in the equatorial Pacific sediments to astronomical forcing. Finally, we would like to contribute to a new high-resolution (on orbital time-scales) record of stable isotopes from bulk sediments at four IODP Exp. 320 sites (U1331 through U1334) along a depth transect from the top of magnetic polarity chron C15n through the base of C12r across the Eocene/Oligocene transition (35 to 33 Ma).