南黄海江苏岸外潮流沙脊远端沉积与演化

温春; 刘健; 张军强; 仇建东; 刁少波; 岳保静; 孙丽莎; 孔祥淮

doi:10.3724/SP.J.1140.2011.03001

南黄海江苏岸外潮流沙脊远端沉积与演化

温春^1,2,
刘健^2,3,
张军强^1,2,
仇建东^1,2,
刁少波³,
岳保静³,
孙丽莎³,
孔祥淮³

1 中国海洋大学海洋地球科学学院, 青岛 266100;
2 国土资源部海洋油气资源与环境地质重点实验室, 青岛 266071;
3 青岛海洋地质研究所, 青岛 266071

基金项目:

国土资源部地质调查项目(1212010611401)

国家自然科学基金项目(40876034)

详细信息

作者简介:
温春(1982-),博士生,从事海洋沉积学和海洋地球化学研究,E-mail:wenchun_321@163.com

中图分类号: P736.21
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出版历程
- 收稿日期: 2011-02-26
- 修回日期: 2011-04-19

SEDIMENTARY CHARACTERISTICS AND EVOLUTIONARY HISTORY OF THE DISTAL PART OF THE TIDAL SAND RIDGES IN THE SOUTH YELLOW SEA, OFF THE JIANGSU COAST

1 College of Marine Geoscience, Ocean University of China, Qingdao 266100, China;
2 Key Laboratory of Marine Hydrocarbon Resources and Environment Geology, Ministry of Land and Resources, Qingdao 266071, China;
3 Qingdao Institute of Marine Geology, Qngdao 266071, China

摘要

摘要: SYS-0702孔位于南黄海江苏岸外潮流沙脊的远端(水深32 m),其最顶部18.64 m岩心对应于潮流沙脊沉积。根据对潮流沙脊沉积物的岩性特征、粒度分析、AMS ¹⁴C测年资料和²¹⁰Pb测试分析,结合通过该孔位的高分辨率浅地层剖面,揭示了该远端沙脊的沉积特征、形成时间以及老黄河从江苏入海(1128-1855年)对沙脊沉积作用的影响。结果表明,该远端沙脊形成于约2.5 cal.kaBP至今,其内部的反射层向东、东北方向倾斜而下超至沙脊的底界面上;沙脊内部的前积反射层倾角一般<0.2°,大多呈上凸形态,与底部的侵蚀界面相切;远端沙脊总体上显示从下至上逐渐变粗的反粒序,砂质沉积物中跃移组分达到80%以上,悬浮组分不到20%,分选性较好;在老黄河从苏北入海期间(1128-1855年),潮流沙脊远端的沉积速率较之前明显增加,即由0.28~0.77 cm/a增加到1.10 cm/a;在老黄河1855年再次改道入渤海后,沙脊远端的沉积速率明显下降,减少至0.23 cm/a。根据以往的研究,长江古河口湾和苏北东台为辐射状潮流沙脊顶点的发育时间分别为8和6 kaBP,至约2.5 cal.kaBP潮流沙脊由这两处向海进积至SYS-0702孔位所在的远端沙脊,其直线平均进积速率分别为61.7 m/a和65.9 m/a;自2.5 cal.kaBP以来沙脊远端向离岸方向进积的速率大为降低(约4 m/a),可能与深水区潮流作用减弱、沉积物供应减少有关。
- 潮流沙脊 /
- 沉积特征 /
- 老黄河 /
- 南黄海
Abstract: The core SYS -0702 was recovered in the distal part of the tidal sand ridges in the South Yellow Sea, off the Jiangsu coast at a water depth of 32 m, and the uppermost 18.64 m of the core corresponds to the distal deposits of the sand ridges. Based on lithologic features, grain-size distribution pattern, AMS¹⁴C dating data and ²¹⁰Pb data of the core sediments, in combination with the high-resolution shallow seismic profile passing through the core site, this paper reveals the sedimentary characteristics of the distal sand ridges, formation time, and the influence of the old Yellow River on the sedimentation of the sand ridges when the river discharged into the South Yellow Sea from the Jiangsu coast during 1128 to 1855. The research results show that the distal sand ridges have been keeping active since about 2.5 cal.kaBP, and their internal reflections dip to the east and northeast downlapping onto the basal boundary of the sand ridges. The dip angles of the internal foresets are generally less than 0.2°, mostly convex in shape and tangent to the erosive surface of the sand ridges. The core section of the distal sand ridges roughly coarsens upward, and in the sandy sediments the saltation load is higher than 80% and the suspension load less than 20%, with a good sorting. During 1128-1855 when the old Yellow River entered the South Yellow Sea from the Jiangsu coast, sedimentation rates in the distal sand ridges increased significantly, from 0.28~0.77 cm/a before the river shifting up to 1.10 cm/a during the event. But the rate decreased to 0.23 cm/a after the old Yellow River going back to the Bohai sea in 1855. According to previous researches, the paleo-Yangtze river estuary and Dongtai were supposed to be the vertex of the radial tidal sand ridges in about 8 kaBP and 6 kaBP, respectively. The progradation of the sand ridges to the core site from the paleo-estuary during 8~2.5 kaBP and from Dongtai during 6~2.5 kaBP are about 61.7 m/a and 65.9 m/a, respectively. The progradation further towards the sea from the distal ridge, however, has reduced to about 4 m/a since about 2.5 cal.kaBP, which is considered to be caused by weakened tidal action and declined sediment supply in the deeper water.
- south Yellow Sea /
- tidal sand ridges /
- sedimentary characteristics /
- old Yellow River

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