Mounded seismic units in the modern canyon system in the Shenhu area, northern South China Sea: Sediment deformation, depositional structures or the mixed system?
Mounded seismic units in the modern canyon system in the Shenhu area, northern South China Sea: Sediment deformation, depositional structures or the mixed system?
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南海北部神狐海域现代峡谷体系中的丘状地震单元：沉积物变形、沉积构造还是混合体系？
DOI：
10.1007/s13131-022-2002-8
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发表时间：
2022-09
期刊：
影响因子：
--
通讯作者：
Liu Lejun
中科院分区：
文献类型：
--
作者：
Li Xishuang;Zhang Chengyi;Liu Baohua;Liu Lejun
南海北部神狐海域的峡谷系统包括17个斜坡限制的小峡谷，其峡谷两侧和峡谷头部的丘陵或起伏特征是显着的特征。然而，这些特征形成的机制尚未阐明。以往的研究大多将其解释为勘探地震剖面上的沉积物变形。在本文中，我们收集了高分辨率测深数据、线性调频剖面和岩土测试数据，以研究其详细形态、内部结构和起源。测深数据表明，大多数堆积的地震单元具有光滑的海底，并被凹槽或凹陷分隔开。两个相邻的土堆之间的距离只有数百米。在啁啾剖面上，堆积的地震单元通常表现出混沌反射和波状反射，其中波峰向上迁移。边坡稳定性分析结果显示，研究区土层临界角趋于9°，表明目前峡谷两侧和头顶的土丘地震单元大部分处于稳定状态。地形特征和地震形态结合边坡稳定性分析结果表明，大多数丘状地震单元不是沉积物变形，而是沉积构造或变形与沉积构造的混合体系。
The canyon system, including 17 small slope-confined canyons in the Shenhu area, northern South China Sea, is significantly characterized by mounded or undulating features on the canyon flanks and canyon heads. However, the mechanism underlying the formation of these features has yet to be elucidated. In previous studies, most of them were interpreted as sediment deformation on the exploration seismic profiles. In this paper, we collected high-resolution bathymetric data, chirp profiles and geotechnical test data to investigate their detailed morphology, internal structures, and origin. The bathymetric data indicated that most mounded seismic units have smooth seafloors and are separated by grooves or depressions. The distance between two adjacent mounded units is only hundreds of meters. On chirp profiles, mounded seismic units usually exhibit chaotic reflections and wavy reflections, of which the crests migrate upslope. The slope stability analysis results revealed that the critical angle of the soil layers in the study area tends to be 9°, indicating that most mounded seismic units on the canyon flanks and heads are stable at present. The terrain characteristics and seismic configurations combined with the slope stability analysis results indicated that most mounded seismic units are not sediment deformation but depositional structures or mixed systems composed of deformation and depositional structures.
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DOI：
10.1007/978-3-642-57916-5_3
发表时间：
1965
期刊：
--
影响因子：
--
作者：
D. Mumford;J. Fogarty;F. Kirwan
通讯作者：
D. Mumford;J. Fogarty;F. Kirwan
影响因子：
2.1
作者：
D. O'leary;E. Laine
通讯作者：
D. O'leary;E. Laine
南海北部珠江口盆地白云凹陷中中新世改造浊积岩：过程、成因及意义
影响因子：
3
作者：
李云;Dorrik Stow;Qiang Xu;Rachel E. Brackenridge
通讯作者：
Rachel E. Brackenridge
影响因子：
3.5
作者：
C. Gong;Yingmin Wang;Weilin Zhu;Weiguo Li;Qiang Xu
通讯作者：
C. Gong;Yingmin Wang;Weilin Zhu;Weiguo Li;Qiang Xu
影响因子：
2
作者：
M. Gee;R. Gawthorpe;S. J. Friedmann
通讯作者：
M. Gee;R. Gawthorpe;S. J. Friedmann