南黄海辐射沙脊群苦水洋海域沉积地层特征及其环境演变

南京大学学报(自然科学版) ›› 2014, Vol. 50 ›› Issue (5): 564–575.

南黄海辐射沙脊群苦水洋海域沉积地层特征及其环境演变

(王羽涵1，夏非1, 2，殷勇1*，邹欣庆1

出版日期:2014-09-04 发布日期:2014-09-04
作者简介:(1. 南京大学地理与海洋科学学院海岸海洋科学系海岸与海岛开发教育部重点实验室,南京 210023;2. 江苏第二师范学院城市与资源环境学院,南京 210013)
基金资助:
基金项目371024），国家建设高水平大学公派研究生项目（2011619035）收稿日期014-7-15*通讯联系人mail：yinyong@nju.edu.cn

Characteristics of sedimentary strata and environmental changes of Kushuiyang tidal channel in the radial tidal ridge field, southern Yellow Sea

Wang Yuhan1, Xia Fei1, 2, Yin Yong1*, Zou Xinqing1

Online:2014-09-04 Published:2014-09-04
About author:(1. The Key Laboratory of Coast and Island Development of Ministry of Education, Department of Coastal Ocean Science, School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China; 2. School of Urban and Resource Environment, Jiangsu Second Normal University, Nanjing 210013, China)

摘要/Abstract

摘要： 通过分析南黄海辐射沙脊群苦水洋海域铁板沙11DT06钻孔的沉积相序列、14C测年数据、粒度特征及其沉积环境意义，并与该海域北翼潮流通道11DT01孔、里磕脚11DT02孔对比，重建了MIS 3阶段以来苦水洋海域的环境演变过程。铁板沙11DT06孔自上而下揭示了4个沉积序列：S1（潮流沙脊层S2（潮滩层S3（陆相硬黏土层S4（高潮滩层 44~25 ka BP）、洪泛平原（陆相硬黏土层，ca. 25~12 ka BP）、滨岸沼泽与潮滩（ca. 12~7 ka BP）和水下沙脊-潮流通道（ca. 7 ka BP至今）等一系列环境演变过程。铁板沙潮流沙脊主要由细砂和粉砂质细砂组成，而MIS 3阶段与早全新世的潮滩沉积主要由黏土质粉砂和粉砂质黏土组成分选性总体都较差，基本都为正偏态

Abstract: Based on the analysis of sedimentary facies, 14C dating results, characteristics of grain size and its environmental implication of core 11DT06, which is in the Kushuiyang area of radial sand ridge field, southern Yellow Sea, and stratigraphic correlation between core 11DT06 and adjacent cores (i.e., core 11DT01 and 11DT02), we reconstructed the progression of environmental changes in the Kushuiyang area since MIS 3. Core 11DT06 revealed four sedimentary sequences from top to bottom (i.e., S1, tidal sand ridge layer; S2, tidal flat layer; S3, terrigenous stiff mud layer; S4, upper tidal flat layer). The Kushuiyang area experienced a series of environmental changes mainly controlled by sea level changes since MIS 3, which included tidal flat (ca. 44~25 ka BP), river flood plain (terrigenous stiff mud layer, ca. 25~12 ka BP), coastal marsh and tidal flat (ca. 12~7 ka BP), and subaqueous sand ridge-tidal channel (ca. 7 ka BP to present) environments. The Tiebansha tidal sand ridge (i.e., the site of core 11DT06) was mainly composed of fine sand and silty fine sand, while the MIS 3 and early Holocene tidal flat deposits were mainly composed of clayey silt and silty clay. These deposits generally had poor sorting and positive skewness, showing that there was a tail of fine sediments in the grain size distribution, which was a major feature of tidal sediments. These characteristics of grain size parameters were obviously different between tidal sediments and stiff mud layers of river flood plain facies, indicating the discrepancy in terms of dynamic sedimentary environments. Eleven AMS 14C and two OSL dating results of three cores in the Kushuiyang area showed the complexity and uncertainty of late Quaternary dating results recovered from the intensive land-sea interaction areas again

(王羽涵1，夏非1, 2，殷勇1*，邹欣庆1. 南黄海辐射沙脊群苦水洋海域沉积地层特征及其环境演变[J]. 南京大学学报(自然科学版), 2014, 50(5): 564–575.

Wang Yuhan1, Xia Fei1, 2, Yin Yong1*, Zou Xinqing1. Characteristics of sedimentary strata and environmental changes of Kushuiyang tidal channel in the radial tidal ridge field, southern Yellow Sea[J]. Journal of Nanjing University(Natural Sciences), 2014, 50(5): 564–575.

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