地理科学 ›› 1983, Vol. 3 ›› Issue (1): 37-46.doi: 10.13249/j.cnki.sgs.1983.01.37

• 论文 • 上一篇    下一篇

珠江三角洲的沉积速率

黄镇国, 李平日, 张仲英, 李孔宏   

  1. 广州地理研究所
  • 出版日期:1983-01-20 发布日期:1983-01-20

ON RATE OF SEDIMENTATION OF THE ZHUJIANG DELTA

Huang Zhenguo, Li Pingri, Zhang Zhongying, Li Konghong   

  1. Guangzhou Institute of Geography
  • Online:1983-01-20 Published:1983-01-20

摘要: 研究三角洲的第四纪沉积过程,是认识三角洲发育历史的一个重要方面,沉积速率则是沉积过程的综合反映。本文分析珠江三角洲各个发育阶段、各个沉积区的沉积速率及其变化和差异,为予测三角洲的发展趋势和淤积速度提供必要的参数。

Abstract: According to the sedimentary facies and C14 dating,the Quaternary process ofthe Zhujiang Delta can be divided into three depositional cycles and six stagesof evolution.At the same time,six sedimentary areas can be recognized on accountof the differences of depositional process between one another.This paper attempts to discuss the change of sedimentation rate in different stages and areas of thedelta.127 (at least)or 230 (at most)drill hole sections are used to count thesedimentation rate for each evolution stage.Moreover,the compression rate ofthe strata are dispeled,when computing the mean thickness of the strata.The computed results of sedimentation rate are as follows:(1) The meanrate of 4th—6th stages is 2.52mm/yr.for the whole delta,but Xi-Beijiang Deltais 2.55mm/yr.and Dongjiang Delta 2.01 mm/yr.;(2) The mean rate of thelater three stages is 3.76 times larger than that of the earlier three stages.It isthus shown that Zhujiang Delta was mainly deposited since Middle Holocene,i.e.about 7,500 years B.P.;(3) During the period of past 5,000 years,themean rate of the last 2,500 years (2.710mm/yr.) increased 19.5% as againstthe earlier 2,500 years,while the rate of middle area of Xi-Beijiang Deltainoreased about 41.1%.During the last 2,500 years,the mean rate of middle sedimentary area ofXi-Beijiang Delta Wanqingsha,and eastern part of Lingdingyang was 5.64mm/yr.,8.46mm/yr.and 5.15mm/yr.respectively.Based on the above calculated mean rate,we can estimate that fill-up of the whole estuary of Lingdingyang may require atime duration of 508—834 years.