| 东南极普里兹湾陆隆区脊状沉积体的结构和形成过程 |
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| 关键词:East Antarctica Prydz Bay sediment ridge turbidity current contour current sediment wave |
| 基金项目:国家自然科学基金青年基金(编号: 41306201); 国家海洋局“南北极环境综合考察与评估专项”之“南极周边海洋地球物理考察”(编号: CHINARE2014-01-03; CHINARE2015-01-03)和“南极环境综合分析与评价”项目(编号: CHINARE2014-04-01; CHINARE2015-04-01) |
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| Structure and Development Processes of the Sediment Ridges on the Continental Rise off the Prydz Bay Margin, East Antarctica |
| Several sediment ridges (SRs) are located on the continental rise off the Prydz Bay margin, East Antarctica. These SRs recorded the history of the regional glacial movements and bottom current activities. Multichannel seismic reflection data in this region have been interpreted together with bathymetry data for the planar distribution, cross-section structures along strike, and the formation and development processes of the SRs. On such a basis, two different groups of the SRs have been identified. The first group includes two SRs which were asymmetric levees on both sides of the Wild Canyon in the western part of the study area. The second group includes SRs in the eastern part of the study area whose formation and development were closely related to the local, diachronous hiatuses generated by the turbidity flow. The onset time of the turbidity activities in different canyons is not concurrent. For Wild Canyon in the west, the onset time is P1, which is the base of the glaciomarine deposit on the continental rise, while for Wilkins and Murray Canyon in the east, it began at a later time P3 (~26.1 Ma), which represents an expansion of the glaciers in Prydz Bay area. All the canyons and the turbidity currents within them both extended seaward with time and so did the consequent SRs. In the areas north of the seaward edge of the SRs, large deep sea sediment waves consisting of fine-grained sediments supplied mainly by down-slope turbidity currents were generated under westward-flowing bottom currents. |
| SHEN Zhong-yan,YANG Chun-guo,GAO Jin-yao,JI Fei.2015.Structure and Development Processes of the Sediment Ridges on the Continental Rise off the Prydz Bay Margin, East Antarctica[J].Acta Geoscientica Sinica,36(6):709-717. |
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