摘要
中山市珠海格力商业大厦场址钻孔表明，距今（４５１２０±９１０）ａ海水已经侵入珠江三角洲地区，当时海平面约在－３４．７ｍ。沉积剖面及其比较研究表明，场区从晚更新世海侵以来是连续的滨海相沉积；场区还是晚更新世海侵以来差异构造运动显著的珠江三角洲（乃至东南沿海）地区地壳的一块“稳定小岛”。
The ages of Ostrea shells in silt layers of the depths of -36.80m and -36.35m for ZK 1 and ZK 2 drill holes are (45 120 ± 910)a B.P. and (44 870 ± 900)a B.P. , respectively at the site of Geli Great Commerce Mansion of Zhongshan City of Guangdong Province. It is the earliest transgression layer since 50 000a B.P. that has been covered so far in the Zhujiang (pearl) Delta and along the coast of China. The confirmed sediment of littoral facies have been almost continuous since 45 000a B.P. 18 samples of sediment of littoral facies at various depths have been compared with 82 samples of sediment of littoral facies of 38 drill holes in other areas in the Zhujiang Delta and southeast coast of China. The results show that the range of uplift and subsidence of the site is smallest and the crust at the site has been stable since 45 000a B.P. and hence a related curve of “eustatic” sea level changes can be obtained. The curve shows that the sea levels were roughly -34.7m to -10.9m for (45 120 ± 910)a B.P. to (24 410 ± 470)a B.P., -9.85m to -3.25m for (23 750 ± 890)a B.P. to (12 580 ± 400)a B.P., -2m for 8 000a B.P., -1.1m for 4 000a B.P., and -0.03m for (2 130 ± 90)a B.P., and the rising rate of sea level in the Holocene ( 0.58 to 0.01mm/a) was substantially lower than that in the Late Pleistoncene (4.84 to 0.51mm/a).
出处
《地震地质》
EI
CSCD
北大核心
1997年第1期91-95,共5页
Seismology and Geology
基金
地震联合科学基金
关键词
晚更新世
海平面变化
广东
海侵层
Late Pleistocene Epoch, Sea level change, Guangdong, Transgression layer
