厦门筼筜港的形成与演变

Formation and evolution of the Yuandanggang in Xiamen, Fujian

本文根据实际调查的资料,概述了筼筜港区的地质地貌特征,重点论述了第四纪沉积物的成因和时代,阐述了该区的形成与演变过程,把它划分为5个发育阶段。

Based on the investigation data ,this paper outlines the geologic and geomorphologic characteristics of the Yuandanggang area in Xiamen, in which the origin and age of the Quaternary sediments are emphatically discussed. The results show that the formation and evolution of the Yuandanggang area since the Quaternary might be divided into five stages: ①Early Quaternary(about 2480000—730000a,B. P. )——formation of the Yuandang fault-de-pression basin and ancient valley. ②Middle Quaternary(about 730000—70000a,B. P. )——denudation of relief and formation and development of laterite weathering crust. ③Late Quaternary (about 40000—10000a, B. P. )——occurence of two transgressions (Kecuo transgression Ⅰ, Ⅱ)-regression cycle and formation of the embryo Yuandanggang and T_2, T_3. ④Holocene(since about 8000a,B. P. )——occurence of two transgressions (Yuandang transgression Ⅰ , Ⅱ)-regression cycle and formation of the mature Yuandanggang, creation of T_1 and marine plain. ⑤Anthropogenic Evolution Period (since 1971A. D. )——construction of Yuandang causeway, formation of the Yuandang lake and development of new urban area.