The thick sequence of mid-late Cenozoic sediments preserved within the Enderby Basin of the East Antarctica margin contains key information regarding glacial history and palaeo-oceanographic conditions during the last 34 My. The interplay between glacial processes and ocean circulation can be reconstructed from seismic stratigraphic studies. Here, interpretation of seismic sequences and geomorphology from an extensive 2D seismic dataset (∼75,000 km) are correlated with lithological data of the ODP site 1165 drilled on the continental rise, and used to assess the age and origin of the sediment, and the possible influence of oceanic currents on its distribution. Mapping of seismic units and facies reveals that, in addition to glacial sediments derived from the Antarctic mainland, the upper Cenozoic succession includes drift units with prograding sequences building out from the Mac. Robertson Land margin, west of the Prydz Bay. Three contourite drifts grew on the western side of submarine channels and large sediment wave fields suggest a mixed system of turbidity currents influenced by west-flowing bottom currents. The drifts are composed of four seismic units representing stages of onset (Lower Oligocene), main growth (Early-Middle Miocene), maintenance (Middle-Late Miocene) and burial (Pliocene). The internal geometry and reflection patterns of the drifts imply an intensified current activity from the Early to Middle Miocene. The results plausibly reflect that the formation of proto Antarctic Bottom Water (AABW) started around the Eocene–Oligocene boundary and intensified episodically from the early to middle Miocene.

中文翻译：

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恩德比盆地（南极东部边缘）新生代深水沉积过程

南极洲东部边缘恩德比盆地内保存的新生代中晚期沉积物的厚序列包含了过去 34 My 的冰川历史和古海洋条件的关键信息。冰川过程和海洋环流之间的相互作用可以从地震地层学研究中重建。在这里，从广泛的二维地震数据集（~75,000 公里）对地震序列和地貌的解释与在大陆隆起钻探的 ODP 站点 1165 的岩性数据相关联，并用于评估沉积物的年龄和起源，以及可能的洋流对其分布的影响。地震单元和相图显示，除了来自南极大陆的冰川沉积物外，上新生代序列包括从 Mac 构建的渐进序列的漂移单元。普里兹湾以西的罗伯逊地缘。海底河道西侧发育了三个等高线漂移，大沉积波场表明存在受西向底流影响的混浊流系统。断层由四个地震单元组成，分别代表起始阶段（下渐新世）、主要生长阶段（早-中新世）、维护阶段（中-晚中新世）和埋藏阶段（上新世）。漂移的内部几何形状和反射模式表明，从早中新世到中新世，水流活动加强。结果振振有词地反映出，原始南极底水 (AABW) 的形成始于始新世-渐新世边界附近，并从中新世早期到中期阶段性地加强。