西南极大陆边缘块体搬运沉积体系的沉积特征、时空分布、及其成因机制研究

块体搬运沉积体系（MTDs）是一种在重力作用下发育的深水沉积体系，对大陆边缘的地层内部结构和地貌塑造有重要的影响。MTDs可以造成危害极大的深水地质灾害，同时与油气资源的形成与富集相关。 MTDs是南极大陆边缘海重要的沉积特征，受冰川活动变化的作用强烈，因此MTDs的研究对南极大陆的冰盖消长循环和古气候演变有重要的指示意义。然而目前对于西南极大陆边缘MTDs的触发机制以及对气候变化的响应机理等缺乏系统深刻的认识，特别是MTDs与南极冰盖扩张和收缩、及温室效应以及地质历史时期气候响应关系尚不明确。此外，MTDs发生时间的鉴定也是国际难题，主要原因是MTDs搬运距离长，其搬运过程同时受到多种因素影响。本项目将利用二维勘探地震数据和ODP/IODP钻井数据，结合多种地层标定方法和数值模拟方法，重点阐明西南极大陆边缘MTDs的时空分布规律，控制因素和触发机制，及MTDs对全球气候变化的响应。

Mass-transport deposits (MTDs) are gravity-induced units that represent an important component of modern and ancient deep-water stratigraphic successions and have profound effects on the morphology and stratigraphic architecture of continental margins. They can represent a threat to human life and infrastructures, and also have implications for hydrocarbon exploration/production. In the Antarctic regions, MTDs are one of the predominant sedimentary processes on the continental slope with more complex controlling factors due to the influence of Antarctic ice sheet dynamics. Therefore, architecture and characteristics of MTDs on the Antarctic continental margin provide key clues about past ice sheet advance/retreat cycles. Only limited information of MTDs are known regarding the trigger mechanism and responses to climate variations, particularly the relationship between MTDs and ice sheets advances/retreats, greenhouse effect, and the ‘global warmth’ during geological time. Dating of MTDs is another difficult task that is rarely performed in great detail due to its long transport distance and controlling factors. This project is focused on the MTDs on the western Antarctic margin and aim to improving the understanding of their distribution in space-time as well as the trigger mechanisms by applying 2D seismic methods, ODP/IODP drilling information, mutil-dating methods as well as numerical modelling. The occurrence of MTDs will be further link to glacial-interglacial cycles, sea level changes and climate variation from Eocene to present day.