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

南极Wilkes Land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沉积的年龄、性质和古环境。确定威尔克斯陆沉积物的年代地层学（目前还不存在），对于确定该边缘现有的冰川地层学和冰盖体积模型的真实性至关重要。冰盖模型表明，威尔克斯陆缘在南极东部冰期后期开始结冰；因此，该地区被认为对未来的温度变化更为敏感。钻探威尔克斯陆缘有一个独特的优势，那就是WL-U3不整合面可以将大陆架上的冰期前地层与冰期地层分离开来，可以追溯到陆隆起沉积，从而将陆架与隆起联系起来。由于“冰川开始”不整合以下和以上的地层可以在相对较浅的穿透深度取样，因此可以在一次钻探考察中从两个沉积环境中获得冰川开始的记录，即陆架森林（建议地点WLSHE-07， WLSHE-09， WLSHE-10和WLSHE-11）和深海平原半深海（建议地点WLRIS-02A）地层。对这些剖面中冰川序列的年龄和性质的限制对于为南极冰盖发育模式提供年龄限制是必不可少的。

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.