晚更新世江苏海岸带沉积分布模拟研究

发布时间：2018-05-17 06:11

  本文选题：气候冰川 + 沉积　； 参考：《沉积学报》2016年04期

【摘要】：中国边缘海大陆架在晚更新世时期曾是海岸平原,在古长江、古黄河泥沙填充下形成了陆架堆积体,并在全新世发育了南黄海辐射沙脊群、废黄河三角洲和长江三角洲。根据点状的地质钻孔分析和重建,对南黄海—江苏海岸的沉积体系的分布和变化机制尚不明了。作为动力机制探讨,基于气候—海面—沉积系统,根据气候水文学、沉积学原理以及泥沙沉积面的动态高程计算,构建了气候冰川驱动—东黄海地海系统响应—河流沉积建造的数值模式,模拟了14万年、4万年和1万年不同时间尺度江苏海岸线和长江三角洲沉积的变化过程和分布,进而对冰川气候、构造沉降、沉积压实等复杂效应下的海面特征、陆源泥沙沉积和海岸线进行分析。模拟结果与地质钻孔资料揭示的层序和埋深能够进行对比。
[Abstract]:In the late Pleistocene, the continental shelf of the marginal sea in China was the coastal plain. In the paleo-Yangtze River, the paleo-Yellow River was filled with sediment to form the continental shelf accumulations, and in the Holocene, the South Huang Hai radiative sand ridge group, the abandoned Yellow River Delta and the Yangtze River Delta were developed. Based on the analysis and reconstruction of the point geological boreholes, the distribution and variation mechanism of the sedimentary system along the southern Huang Hai-Jiangsu coast is still unclear. As a dynamic mechanism, based on the climate, sea surface and sediment system, the dynamic elevation of sediment surface is calculated according to climatic hydrology, sedimentology and dynamic elevation of sediment surface. A numerical model of climate glacier-driven response to fluvial deposition in the East Huang Hai Geosphere-Seas system is constructed. The variation process and distribution of Jiangsu shoreline and Yangtze River Delta deposits at different time scales of 140,000 years, 40,000 years and 10,000 years are simulated. Furthermore, the sea surface characteristics, continental sediment deposits and shoreline are analyzed under the complex effects of glacier climate, tectonic subsidence and sedimentary compaction. The simulation results can be compared with the sequence and buried depth revealed by geological borehole data.
【作者单位】： 中国科学院南京地理与湖泊研究所;中国科学院大学;安徽师范大学环境科学与工程学院;
【基金】：国家重点基础研究发展计划(973计划)项目(2013CB956501;2012CB956103) 中科院国际合作计划(CAS/SAFEA KZZD-EW-TZ-08-3)~~
【分类号】：P736.2
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本文编号：1900246