关键词: 垂直构造运动, 晚第四纪, 珠江三角洲

Abstract: Based on 166 age data of Quaternary deposits in fossil delta, the rate of the vertical motion of the Zhujiang Delta since late Quaternary has been estimated by eliminating the non-tectonic effects, such as the change of ancient sea level, the compaction of sedimentary layer, and the isostatic crustal subsidence. The estimations have been conducted separately for 11 fault block tectonic regions, which are bounded by NE-trending, E-W-trending and NW-trending faults. The results have indicated that the rate of vertical motion of the Doumen fault block in the south and the Guangzhou-Panyu fault block in the middle parts of the Zhujiang Delta is relatively high. This conclusion has been supported by the results of the studies on the changes of ancient geographic environment, the timing of faulting, and the late Quaternary paleo-seismicity in the Zhujiang Delta area. In contrast to the previous studies, the present study emphasizes the changes of vertical motion rate in different fault blocks and in different time. The result of this study indicates that the secondary fault blocks of the Zhujiang Delta were dominated by elevation motion at a rate of 1～2mm/a during the early Holocene (10～4ka), and were dominated by subsidence at a rate of -3～-4mm/a during the late Holocene (～4ka). The elevation rates of Guangzhou-Panyu, Guanghua Plain, Shunde and Doumen fault blocks were greater than 1mm/a, while the subsidence rates in Guangzhou-Panyu, Shenzhen-Hong Kong, Zhongshan and Doumen fault blocks exceeded -2mm/a.

Key words: Vertical tectonic motion, Late Quaternary, Zhujiang Delta