PDF
Full
Outline
Objective The catastrophic failure of large submarine landslides can result in the deformation and destruction of thousands of square kilometers of seafloor， transporting hundreds to thousands of cubic kilometers of submarine sediments. This process dramatically reconstructs the seafloor topography of the continental shelf-slope region and has a profound impact on subsequent submarine sedimentation processes. Methods The topographic features of different large submarine landslides were qualitatively described using multibeam bathymetric and seismic reflection data， and the key geometric parameters of the submarine landslide top surface， such as area and volume， were quantitatively characterized. Based on the scale， morphological features， and formation mechanisms of the associated reliefs on the submarine landslide top surface， these landslides were separated into three categories： head evacuation zone， locally negative accommodation associated with internal fault systems， and locally negative accommodation associated with internal deformation blocks. The mechanisms of the three types of negative accommodation on the subsequent turbidity current system are then discussed separately. Results Firstly， the head evacuation zone is typically associated with hundreds to thousands of square kilometers of negative accommodation， which acts as a "funnel" during sediment transport along the continental margin， effectively capturing and concentrating subsequent turbidity currents while enhancing the transport efficiency of gravel and coarse sand and playing a crucial role in the accumulation of marine organic matter. Secondly， the striped negative accommodation associated with internal fault systems and the irregular negative accommodation associated with internal deformation blocks can regulate the sedimentation dynamics of subsequent turbidity currents， such as constraining flow direction， enhancing erosion intensity， and forcing channels to avulse. Finally， the negative accommodations associated with the submarine landslide top surface may produce synergistic effects， influencing the sediment filling and evolution of sedimentary basins and the distribution of sedimentary centers over millions of years. Conclusions The investigation of the morphological characteristics of submarine landslide top surfaces and their controlling effects on the subsequent turbidity currents sedimentary dynamic process can provide key geological information for clarifying the transport process of marginal sediments， identifying the distribution of sand-rich reservoirs in deep-sea sedimentary basins， and predicting the development range of catastrophic turbidity currents.
PDF
8
3
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
