苏北废黄河水下三角洲沉积范围研究述评  

Review for the studies on sedimentation range of the Abandoned Yellow River subaqueous delta,North Jiangsu plain coast

作　　者：夏非[1,2] 张永战[1] 王瑞发[1] J.Paul LIU 张振克[1] 彭修强 

机构地区：[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 [3]美国北卡罗来纳州立大学海洋、地球和大气科学系,罗利27695 [4]有色金属华东地质勘查局地球化学勘查与海洋地质调查研究院,南京210007

出　　处：《地理学报》2015年第1期29-48,共20页Acta Geographica Sinica

基　　金：国家重大科学研究计划项目(2013CB956500);国土资源部公益性行业科研专项(201011019);国家海洋局公益性行业科研专项(201005006);国家自然科学基金项目(41371024);国家建设高水平大学公派研究生项目(2011619035)~~

摘　　要：详细梳理现有研究成果,目前对1128-1855年废黄河水下三角洲沉积范围的划分可总结为三类主要观点:1外缘位于废黄河口外近岸、远岸斜坡带之间的宽缓平台(水深范围:-15^-25 m)之上;2外缘位于废黄河口外远岸斜坡带(水深范围:-25^-45 m)之外;3外缘可达-45m等深线之外,且废黄河三角洲由一个近岸/远岸复合楔形沉积体构成。综合分析废黄河水下三角洲海域海底地形地貌、浅部地层沉积特征与14C年代、浅层声学地层等资料数据表明,1128-1855年废黄河水下三角洲的延伸范围应该超过现今-20 m等深线,但未越过远岸斜坡带;远岸斜坡带发育的厚层楔形体不大可能是废黄河三角洲前缘沉积层,其确切成因、物源与年代等问题尚有待于进一步深入研究。为准确圈定1128-1855年废黄河水下三角洲沉积范围,需要对完整覆盖本区的高质量浅层地震剖面进行解译分析,在其三大地形单元(近岸、远岸斜坡带及其之间宽缓平台)内补充钻孔分析,并参考1875年以来各期海图资料来进行综合判定。Based on the published studies,this paper presented three main viewpoints of the maximum developed sedimentation range of the Abandoned Yellow River（AYR） subaqueous delta,North Jiangsu plain coast during AD 1128 to 1855：（1） its outer margin was located on the wide flat platform between the two slope belts in the nearshore and offshore areas off the AYR mouth with a water depth between -15 and -25 m;（2） its outer margin was located outside the offshore slope belt off the AYR mouth with a water depth between -25 and -45 m;（3） the AYR delta was composed of the compound clinoforms and its outer margin could extend beyond the -45 m isobath.Based on the comprehensive studies of the characteristics of topography,geomorphology,sedimentary strata and shallow seismic profiles,combined with the radiocarbon dating results and other data in the concerned areas,it could be concluded that the maximum sedimentation range of the AYR subaqueous delta should extend beyond the current -20 m isobath,however,it was hardly to exceed the offshore slope belt.The thick clinoform located in the offshore slope belt was unlikely to be the front deposits of the AYR delta.Therefore,further investigations need to be made on its definite origin,provenance,formation time and other concerned issues in future.In order to delineate the definite sedimentation range of the AYR subaqueous delta during AD 1128 to 1855,we should recover and interpret the high-quality shallow seismic profiles covering the entire concerned areas,analyze the supplementary sediment cores in the three main subaqueous topographic units（i.e.,the slope belts in the nearshore and offshore areas,and the wide flat platform between these two belts）,and compare the various sea charts issued since AD 1875.

关 键 词：黄河 水下三角洲 楔形沉积体 废黄河三角洲 沉积范围 江苏海岸 南黄海 

分 类 号：P343.5[天文地球—水文科学]