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

FEC 恢复船载科学家 Steven Bohaty 博士在 IODP 318 号探险队（Wilkes Land）的职责

基本信息

批准号：
NE/H020098/1
负责人：
Heiko Pälike
金额：
$ 0.96万
依托单位：
University of Southampton
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2010
资助国家：
英国
起止时间：
2010 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FH020098%2F1
关键词：
FEC Recovery Shipboard Scientist Duties

项目摘要

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.

南极洲海上威尔克斯土地地区的探险318钻探计划旨在限制以前仅在地震上推断的冰川序列的沉积的年龄，性质和古环境。目前不存在的威尔克斯陆地沉积物的年度地层学对于该边缘的现有冰川 - 地层和冰盖体积模型至关重要。冰盖模型表明，威尔克斯的土地边缘在南极冰川东部的后期变得冰川。因此，它是一个被认为对未来温度变化更敏感的区域。钻探威尔克斯的土地边缘具有独特的优势，因为不整合WL-U3被推断为大陆架上的冰川地层下面的冰川前地层分开，可以追溯到大陆上升的沉积物，从而使序列可以从架子上升起。因为可以在相对较浅的渗透深度上取样“冰川发作”下方和上方的地层，因此可以在两个沉积环境的一次钻探探险中获得冰川发作的记录，所以架子架预测（拟议的sites wlshe-07，WLSHE-07，WLSHE-09，WLSHE-09，WLSHES-WLSHE-WLSHES和WLSHES-111111111111111111111111111111111111111111111111111111111111111111111111111111111。（拟议地点WLRIS-02A）地层。在这些部分中，对冰川序列的年龄和性质的限制对于为南极冰盖开发模型提供年龄限制至关重要。