北海南部Lunden湾全新世沉积环境演变
发布时间：2018-08-10 17:03
【摘要】：北海(North Sea)被现在的大不列颠岛、斯堪的纳维亚半岛、日德兰半岛和荷比低地等围绕,主体是一个自南向北倾斜加深的陆架沉积盆地。随冰后期海面上升,北海南部瓦登海(Wadden Sea)发育了广阔的潮滩海岸。北海南部日德兰半岛西岸Lunden湾古o_湖进行野外调查,利用重力取样器自埋深53 cm始获取了719 cm长的无扰动高取芯率沉积柱LN,并对上部53 cm进行现场观测与分层取样。对沉积柱沉积物结构构造、粒度和烧失量的测试,及沉积物粒度数据的EMMA进行分析。研究表明:这一地区主要保留了河流沉积(EM1)、潮流沉积(EM2)与波浪/风暴沉积(EM3)。早期,波浪/风暴作用为主(EM3)。继而,潮流动力主控(EM2)。随之,河流影响(EM1)不断加强,海洋作用逐渐减弱,乃至消失。与沉积构造和烧失量数据结合,EM3有效揭示了多段风暴沉积物。依据AMS14C测年结果,结合研究区海面变化背景,指示了6050 cal.a BP以来Lunden湾在河—海相互作用下,先后经历了海湾、水下沙坝—o_湖、半封闭沙坝—o_湖和封闭沙坝—o_湖的海退型沙坝—o_湖海岸演化过程,最终在5150cal.a BP发育为滨海湿地。
[Abstract]:The North Sea (North Sea) is surrounded by the present Great Britain, Scandinavia, Jutland and Hobbit lowlands, and the main body is a continental shelf sedimentary basin with a deepening tilt from south to north. With the rise of the postglacial sea, (Wadden Sea) in the Wadden Sea in the south of the North Sea developed a wide tidal beach coast. Field investigation was carried out on the ancient lake of Lunden Bay on the west coast of Jidelan Peninsula in the south of North Sea. By using gravity sampler, 719 cm long undisturbed high coring rate sediment column LNs were obtained from the depth of 53 cm, and the upper 53 cm was observed and stratified. The structure, grain size and burning loss of sediment were measured, and the EMMA of sediment granularity data were analyzed. The results show that the fluvial deposition (EM1), tidal current deposition (EM2) and wave / storm deposition (EM3) are mainly retained in this area. In the early stage, wave / storm action was dominant (EM3). Then, the main power flow control (EM2). Along with it, the river influence (EM1) is becoming stronger and the oceanic action is weakening or even disappearing. Combined with sedimentary structure and loss of burning data, EM3 effectively revealed multi-stage storm sediments. Based on the AMS14C dating results and the sea level variation background in the study area, it is indicated that since 6050 cal.a BP, the Lunden Bay has experienced the gulf and underwater sanddam _ olake since 6050 cal.a BP under the interaction of the river and sea. The coastal evolution process of the semi-enclosed sand dam -o_ lake and the closed sand dam -o_ _ lake is finally developed into a coastal wetland in 5150cal.a BP.
【作者单位】： 南京大学地理与海洋科学学院;南京大学海岸与海岛开发教育部重点实验室;江苏第二师范学院城市与资源环境学院;国家海洋局海底科学重点实验室;Institute
【基金】：外专千人计划:“青藏高原全新世环境与水文变化研究”(2014-2017) 2014-2016 Deutscher Akademischer Austausch Dienst Project(57090188)
【分类号】：P736.2
本文编号：2175596
[Abstract]:The North Sea (North Sea) is surrounded by the present Great Britain, Scandinavia, Jutland and Hobbit lowlands, and the main body is a continental shelf sedimentary basin with a deepening tilt from south to north. With the rise of the postglacial sea, (Wadden Sea) in the Wadden Sea in the south of the North Sea developed a wide tidal beach coast. Field investigation was carried out on the ancient lake of Lunden Bay on the west coast of Jidelan Peninsula in the south of North Sea. By using gravity sampler, 719 cm long undisturbed high coring rate sediment column LNs were obtained from the depth of 53 cm, and the upper 53 cm was observed and stratified. The structure, grain size and burning loss of sediment were measured, and the EMMA of sediment granularity data were analyzed. The results show that the fluvial deposition (EM1), tidal current deposition (EM2) and wave / storm deposition (EM3) are mainly retained in this area. In the early stage, wave / storm action was dominant (EM3). Then, the main power flow control (EM2). Along with it, the river influence (EM1) is becoming stronger and the oceanic action is weakening or even disappearing. Combined with sedimentary structure and loss of burning data, EM3 effectively revealed multi-stage storm sediments. Based on the AMS14C dating results and the sea level variation background in the study area, it is indicated that since 6050 cal.a BP, the Lunden Bay has experienced the gulf and underwater sanddam _ olake since 6050 cal.a BP under the interaction of the river and sea. The coastal evolution process of the semi-enclosed sand dam -o_ lake and the closed sand dam -o_ _ lake is finally developed into a coastal wetland in 5150cal.a BP.
【作者单位】： 南京大学地理与海洋科学学院;南京大学海岸与海岛开发教育部重点实验室;江苏第二师范学院城市与资源环境学院;国家海洋局海底科学重点实验室;Institute
【基金】：外专千人计划:“青藏高原全新世环境与水文变化研究”(2014-2017) 2014-2016 Deutscher Akademischer Austausch Dienst Project(57090188)
【分类号】：P736.2
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