地质通报Issue(10)：1642-1650,9.
天津滨海地区G2孔磁性地层年代及其构造指示
Magnetostratigraphy of drill hole G2 in the Tianjin coastal area and its tectonic significance
摘要
Abstract
It is of great importance to establish reliable chronologic framework in Binhai area for understanding the late Cenozoic depositional environment change, neotectonic movement and evolution history of paleoenvironment. In this paper, the authors pres-ent the magneto-stratigraphic investigation result in drill hole G2 (1226m), which is the longest drill hole in the Tianjin coastal area. On such a basis, the chronostratigraphic subdivision and its tectonic significance were also discussed. The results show that the core of this drill hole began deposition at about 8.5Ma BP. The strata of 1226~658m may be correlated to late Miocene and assigned to upper member of Guantao Formation, the strata of 658~303m belong to Pliocene Minghuazhen Formation, and the upper strata of more than 300m belong to Quaternary, including Mapengkou, Tonglou, Tanggu and Tianjin formations. The basal lower boundary of Ho-locene is identified at about 19.4m by 14C dating. Given the chronostratigraphic scale, two stages of relatively high sedimentation rate (>200m/Ma) can be revealed from drill hole G2, i.e., 8.5~6.43Ma and 3.58~3.03Ma, respectively. Both epochs have good compara- bility on the time scale with extension and uplift of the Tibetan Plateau. It is suggested that the uplift of plateau might also have had a significant impact on sedimentary and tectonic movement of the North China plain.关键词
天津滨海地区/磁性地层/沉积速率/新构造运动Key words
Tianjin coastal area/magnetostratigraphy/sedimentation rate/neotectonic movement分类
天文与地球科学引用本文复制引用
肖国强,杨吉龙,赵长荣,王强,胥勤勉,胡云壮,秦雅飞,李静,肖国桥..天津滨海地区G2孔磁性地层年代及其构造指示[J].地质通报,2014,(10):1642-1650,9.基金项目
中国地质调查局项目 （）
