FEC Recovery for Shipboard Scientist Duties of Dr Steven Bohaty for IODP Expedition 318 (Wilkes Land)

南极洲威尔克斯地近海地区的远征318钻探计划旨在限制以前仅通过地震推断的冰川序列的沉积年龄、性质和古环境。确定威尔克斯地沉积物的年代地层学，这是目前不存在的，是至关重要的地面真理现有的冰川地层和冰盖体积模型，这个边缘。冰盖模型表明，威尔克斯地边缘在东南极冰川作用的后期阶段被冰川化;因此，这是一个被认为对未来温度变化更敏感的地区。在威尔克斯陆缘钻探有一个独特的优势，即推断将大陆架上的冰前地层与冰下地层分开的不整合面WL-U3可以追溯到大陆隆起沉积物，从而使序列从大陆架到隆起联系起来。由于可以在相对较浅的穿透深度处对“冰川起始”不整合面下方和上方的地层进行采样，因此可以在两种沉积环境（陆架前积层（拟定的WLSHE-07、WLSHE-09、WLSHE-10和WLSHE-11站点）和深海平原半远洋（拟定的WLRIS-02 A站点）地层）的单次钻探考察期间获得冰川起始的记录。在这些部分的冰川序列的年龄和性质的限制是必不可少的，以提供南极冰盖发展的模型的年龄限制。

The Expedition 318 drilling program in the offshore Wilkes Land region of Antarctica is designed to constrain the age, nature, and paleoenvironment of deposition of the previously only seismically inferred glacial sequences. Determining the chronostratigraphy of the Wilkes Land sediments, which is at present nonexistent, is critical to ground-truth the existing glacial-stratigraphic and ice sheet volume models for this margin. Ice sheet models suggest that the Wilkes Land margin became glaciated in the later stages of East Antarctic glaciation; therefore, it is an area presumed to be more sensitive to future temperature changes. Drilling the Wilkes Land margin has a unique advantage in that Unconformity WL-U3, inferred to separate preglacial strata below from glacial strata above in the continental shelf, can be traced to the continental rise deposits, allowing sequences to be linked from shelf to rise. Because strata below and above the 'glacial onset' unconformity can be sampled at relatively shallow penetration depths, the record of the onset of glaciation can be obtained during a single drilling expedition from two depositional environments, the shelf foreset (proposed Sites WLSHE-07, WLSHE-09, WLSHE-10, and WLSHE-11) and the abyssal plain hemipelagic (proposed Site WLRIS-02A) strata. Constraints on the age and nature of the glacial sequences in these section is essential to provide age constraints for models of Antarctic ice sheet development.