Depositional elements and evolution of gravity-flow deposits on Lingshan Island (Eastern China): An integrated outcrop-subsurface study
Depositional elements and evolution of gravity-flow deposits on Lingshan Island (Eastern China): An integrated outcrop-subsurface study
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灵山岛（中国东部）重力流沉积物的沉积元素和演化：露头-地下综合研究
DOI：
10.1016/j.marpetgeo.2022.105566
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发表时间：
2022-01
影响因子：
4.2
通讯作者：
Ben Kneller
中科院分区：
文献类型：
--
作者：
Tian Yang;Yingchang Cao;Keyu Liu;JingchunTian;Ben Kneller
了解水下沉积物重力流（SSGF）如何在时间和空间上演化，以及它们的沉积物如何在空间上变化，是重力流沉积学的一个关键研究重点。本研究调查了中国东部灵山岛灵山岛组超临界流和混合事件层（HEB）的沉积相、沉积元素和沉积物运移过程。识别出三种沉积元素：质量传输沉积物（MTD）、河道-波瓣过渡带（CLTZ）和波瓣复合体。 MTD 可分为近端沉积物和远端沉积物。 CLTZ的特征是由块状粗粒卵石砂岩向下坡方向的倒退层理砂岩相变，是超临界浊流沉积。 HEB 在近端和远端叶环境中都很常见。 HEB 中的三部分结构可能是由上坡基质侵蚀引起的，这意味着与二部分 HEB 相比，其起源相对较近，可能是由研究区域的流体分馏引起的。该序列由前进叶单元形成，随后是 MTD，MTD 本身被来自 CLTZ 的沉积物覆盖。这种垂直堆积模式意味着来自 CLTZ 的潜在纵向相带；对于叶状复杂沉积物，伴随着 MTD 在坡折处的安置。伴随泥沙输运过程的水流类型表明，与河道-波瓣过渡区水力跳跃相关的超临界浊流侵蚀可能是泥屑和基质添加到水流中的主要原因。泥屑和悬浮泥的大规模添加可能会抑制近内叶环境中的湍流，并导致具有常见侵蚀特征和三联结构的中厚层 HEB。剩余的悬浮流（泥浆丰富）可能会进一步下倾输送，形成具有二分结构和稀有泥屑的中薄层 HEB。这些发现可能适用于其他具有超临界流沉积和混合事件床的SSGF系统，强调与重力流演化相关的沉积元素的下倾和横向变化。
Understanding how subaqueous sediment gravity flows (SSGF) evolve in time and space, and how their deposits vary spatially, is a key research focus for gravity flow sedimentology. This study investigates depositional facies, depositional elements, and sediment transport processes of supercritical flows and hybrid event beds (HEBs) of the Lingshandao Formation in Lingshan Island, Eastern China. Three kinds of depositional elements were recognized: mass transport deposits (MTDs), channel-lobe transition zone (CLTZs), and lobe complexes. MTDs can be sub-divided into proximal and distal deposits. CLTZs are characterized by facies changes from massive coarse-grained pebbly sandstone to backset bedding sandstone in a down-slope direction, which are the deposits of supercritical turbidity currents. HEBs are common in both proximal and distal lobe settings. Tripartite structure in HEBs, which may be caused by up-slope substrate erosion, implies a relatively proximal origin compared with bipartite HEBs, perhaps caused by fluid fractionation in the research area. The succession is formed by a prograding lobe unit, followed by MTDs which are themselves overlain by deposits from a CLTZ. This vertical stacking pattern implies the potential longitudinal facies tract from CLTZ; to lobe complex deposits, is accompanied by emplacement of MTDs at the slope break. The flow types accompanied by sediment transport processes imply that erosion by supercritical turbidity currents associated with a hydraulic jump in the channel-lobe transition zone may be the main reason for mud-clasts and matrix addition to the flow. The large-scale addition of mud-clasts and suspended mud may dampen turbulence in proximal to medial lobe settings, and result in medium-to thick-bedded HEBs with common erosional features and tripartite structures. The remaining suspension flow (with abundant mud) may further transport down-dip and form medium-to thin-bedded HEBs with bipartite structures and rare mud-clasts. These findings may be applicable to other SSGF systems with supercritical flow deposits and hybrid event beds, emphasizing the downdip and lateral variation in depositional elements associated with gravity flow evolution.
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影响因子：
4.7
作者：
通讯作者：
--
DOI：
10.1023/b:amai.0000012894.03739.de
发表时间：
2004-12
影响因子：
1.2
作者：
通讯作者：
--
影响因子：
2.1
作者：
D. Stanley
通讯作者：
D. Stanley
影响因子：
2
作者：
Yvonne T. Spychala;D. Hodgson;A. Prélat;I. Kane;S. Flint;N. Mountney
通讯作者：
Yvonne T. Spychala;D. Hodgson;A. Prélat;I. Kane;S. Flint;N. Mountney
湖泊裂谷盆地水下沉积物重力流沉积的成因及沉积模式——以济阳坳陷始新世沙河街组为例
影响因子：
4.2
作者：
Yang Tian;Cao Yingchang;Liu Keyu;Wang Yanzhong;Zavala Carlos;Friis Henrik;Song Mingshui;Yuan Guanghui;Liang Chao;Xi Kelai;Wang Jian
通讯作者：
Wang Jian