论文部分内容阅读
运用元素地球化学与重矿物方法对苏北滨海平原全新世沉积物物源进行的比较研究表明,沉积物形成主要由长江与黄河提供物质来源,且又以黄河物源为主。全新世早期长江物质对本区影响范围大于黄河,黄河供给泥沙量较少,对本区影响主要在北部、中部地区。全新世最大海侵之后,黄河曾由苏北入海并携带了大量泥沙,其影响范围明显大于长江,长江仅由狭窄的汊道提供有限的物质而影响范围较小。最近2000 年来本区沉积物物源主要由黄河提供。分析表明元素地球化学方法在沉积物物源判别时,可有效的避免水动力因素影响,而相对重矿物方法取得较好的效果。
A comparative study of the sedimentary provenance of the Holocene in the coastal plain of North Jiangsu using elemental geochemistry and heavy mineral methods shows that the sediment formation is mainly provided by the Yangtze River and the Yellow River and is mainly composed of the Yellow River source. In the early Holocene, the influence of the Yangtze River’s material to the area was greater than that of the Yellow River. The Yellow River provided less sediment, affecting the area mainly in the northern and central regions. After the largest transgression of the Holocene, the Yellow River carried large quantities of sediment into the sea from northern Jiangsu and its scope of influence was obviously greater than that of the Yangtze River. The Yangtze River provided only a limited material by a narrow channel and had a lesser influence. Sediment sources in this area are mainly provided by the Yellow River in recent 2000. The analysis shows that the element geochemical method can effectively avoid the influence of hydrodynamic factors in the sediment source identification, while the relative heavy mineral method has achieved good results.