| GAO Wei,LIU Shihao,LIU Jie,XU Yuanqin,LI Ping. 2018. The sedimentary facies and dynamic environment of the Diaokou lobe in the modern Huanghe River Delta of China. Acta Oceanologica Sinica, 37(11):40－52 |
| The sedimentary facies and dynamic environment of the Diaokou lobe in the modern Huanghe River Delta of China |
| 现代黄河三角洲钓口叶瓣体沉积相及其沉积动力环境特征 |
| Received:May 24, 2018 |
| DOI：10.1007/s13131-018-1332-z |
| Key words:modern Huanghe River Delta sedimentary facies sediment dynamics grain size |
| 中文关键词: 现代黄河三角洲 沉积相 沉积动力环境 粒度 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | GAO Wei | Key Laboratory of Marine Sedimentology and Environmental Geology, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China | | | LIU Shihao | Research Center for Islands and Coastal Zone, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | liushihao@fio.org.cn | | LIU Jie | Key Laboratory of Marine Sedimentology and Environmental Geology, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China | | | XU Yuanqin | Key Laboratory of Marine Sedimentology and Environmental Geology, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China | | | LI Ping | Key Laboratory of Marine Sedimentology and Environmental Geology, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China | liping@fio.org.cn |
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| Abstract: |
| The Huanghe River captures the Diaokou River in 1964 and forms a deltaic lobe in the subsequent 12 a. The progradational process of the Diaokou lobe is in associated with complicated evolution of riverine sheet flooding, merging, and swinging. On the basis of 11 borehole cores and 210 km high resolution seismic reflection data set, the sedimentary sequence and dynamic environment of the Diaokou lobe (one subdelta lobe of the modern Huanghe River Delta) are studied. The stratigraphy of the lobe is characterized by an upward-coarsening ternary structure and forms a progradational deltaic clinoform. Totally six seismic surfaces are identifiable in seismic profiles, bounded six seismic units (SUs). These SUs correspond to six depositional units (DUs) in the borehole cores, and among them, SUs 4-6 (DUs D to F) consist of the modern Diaokou lobe. Lithological and seismic evidences indicate that the delta plain part of the Diaokou lobe is comprised primarily by fluvial lag sediments together with sediments from sidebanks, overbanks, fluvial flood plains and levees, while the delta front part is a combination of river mouth bar sands (majority) and distal bar and deltaic margin sediments (minority). As a result of the high sedimentation rate and weak hydrodynamic regime in the Huanghe River Delta, the sediments in the delta front are dominated by fine-grained materials. The grain size analysis indicates the Huanghe River hyperpycnal-concentrated flow shows the suspension, transportation and sedimentation characteristics of gravity flow, and the sediment transportation is primarily dominated by graded suspension, while uniform suspension and hydrostatic suspension are also observed in places. The strength of the hydrodynamic regime weakens gradually offshore from riverbed, river mouth bar, sidebank, distal bar subfacies to delta lateral margin and flooding plain subfacies. |
| 中文摘要: |
| 黄河1964年改道钓口河入海至1976年废弃，历时12年，在河口段经历了漫流、归股、分汊、摆动的复杂演化过程。本文根据11个地质钻孔和海上浅地层剖面资料，对钓口叶瓣体的沉积相及其沉积动力环境特征进行了研究。现代黄河三角洲钓口叶瓣呈进积型三角洲自下向上粒度逐渐变粗的三元结构。浅地层剖面资料中共发育6个地震界面，分隔出6个地震单位，分别对应钻孔所揭示的6个沉积单元。其中，SUs 4-6（DUs D-F）构成了现代钓口叶瓣沉积体。地震数据与岩性分析共同表明三角洲平原相分布广袤，以河道沉积为骨架，边滩、漫滩沉积大量发育，伴生泛滥平原和天然堤等亚相；三角洲前缘沉积相以河口沙坝为骨架，与伴生的远端坝及三角洲侧缘沉积共同构成。现代黄河三角洲平原沉积以河流沉积作用为主，三角洲前缘沉积受黄河泥沙条件与渤海海洋动力条件的共同控制，前三角洲沉积以细颗粒沉积物为主，且经常受到高密度流体的影响。黄河高含沙流体沉积物以递变悬浮的搬运方式为主，均匀悬浮为辅，夹杂少量静水悬浮沉积，但与普通的牵引流、浊流和泥流之间均存在较大的区别，具有重力流的搬运和沉积特点；水动力条件自河床、河口坝、边滩、远端坝、三角洲侧缘、前三角洲和泛滥平原逐渐减弱。 |
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