摘要
使用第四纪地质、统计地貌学和历史水准点调查等手段,研究了天津地区的构造沉降背景,讨论了控制地面沉降远景目标问题。研究工作使用天津地区第一海相层底板埋深、全新统地层钻孔、深层基岩标和历史水准点等一系列资料,获得天津市和邻近地区构造沉降的平均速率为1.7mm a左右。研究还发现了基底构造沉降背景具有这样一些规律:(1)从西部到东部沿海,区内沉降有逐渐增加的趋势。(2)沿海河发育了一条北西方向的构造沉降异常带。(3)以海河为界,沉降分布的方向不同,北部为北西西向,南部为北东方向,整体活动规律反映了活动断裂和基底构造的控制作用。
By the means of Quaternary geology, statistical geomorphology and historical bench mark investigation, the background of tectonic subsidence and the prospects of the subsidence control in Tianjin area are studied. Based on a series of data related to the depth of the first marine layer bottom, the borehole of Holocene, the deep lift marks of bedrock and the historical bench marks in Tianjin area, the average velocity of tectonic subsidence is 1.7mm/a has been obtained. Moreover, some laws for the background of basement tectonics subsidence have been discovered from the research as follows: (1) The tectonic subsidence has a trend of gradual increase from the western region to the eastern coast. (2) An anomalous tectonic subsidence zone in the northwest direction is developed along the Haihe River. (3) It is proved by all kinds of data that the directions of subsidence are different with boundary of the Haihe River. The contour lines extend mainly in NWW in the northern part and NE in the southern part. The law of entire activity has reflected the controlling effect by the active faults and base structure.
出处
《水文地质工程地质》
CAS
CSCD
2003年第5期12-17,共6页
Hydrogeology & Engineering Geology
基金
天津市建委资助项目(98-025)
