摘要
珠江三角洲是由西江、北江、东江以及潭江、绥江、流溪河、增江等在珠江河口湾内堆积成的复合三角洲。从沉积环境(河口段)、动力条件(河、海共同作用)、沉积物(河、海交互相)、地貌类型(冲积-海积平原)、水系特征(放射状网河)等综合考虑,将珠江三角洲的内界初步定在:东至东江园洲(上南)、增江沙塘,北至流溪河广州、石碣和北江黄塘、宝月及绥江黄岗,西至西江羚羊峡东口及潭江司前(图1)。总面积8601.1平方公里,其中西江和北江三角洲8033.1平方公里,占93.4%,东江三角洲568平方公里,占6.6%。三角洲平原上有160余处山丘突起,合计1668.8平方公里,占三角洲总面积的19.4%。
The Zhujiang Delta is a complex delta built up jointly by the Xijiang,Beijiang and Dongjiang Rivers in south China.The delta began to develop in the middle part of the late Pleistocene,where the oldest deposits have a C^(14) age of 37,000±1,480 years B.P.The Quaternary comprises three depositional cycles passing from dominantly terrestrial to dominantly marine facies and six depositional phases,of which the early part of the middle Holocene is the most important.The maximum rate of sedimentation is 2.71 mm/yr(_(4)^(3)),while the minimum rate is 0.299 mm/yr(Q_(3)^(3)-Q_(4)^(1)).Based on the C^(14)dating of the deposits and historical evidence,the locations of the shorelines of the middle-late New Stone Age and the Qin-Han,Tang,Song,Ming and Qing dynasties may be inferred,and the average progradation rates of the delta plain for different phases may be estimated.
作者
黄镇国
李平日
张仲英
李孔宏
Huang Zhenguo;Li Pingri;Zhang Zhongying;Li Konghong(Guangzhou Institute of Geography)
出处
《地质论评》
1985年第2期159-164,共6页
Geological Review
