渤海湾西岸滨海平原晚第四纪以来的沉积间断  

The Significance of the Depositional Hiatuses on the Coastal Plain of West Bohai Bay since the Late Quaternary Period

作　　者：李凤林[1] 王宏[1] 阎玉忠[1] 王云生[1] 张金起[1] 赵长荣[1] 张玉发[1] 李建芬[1] 林防[1] 

机构地区：[1]中国地质调查局天津地质矿产研究所,天津市300170

出　　处：《地质调查与研究》2004年第3期177-183,共7页Geological Survey and Research

基　　金：中国地质调查局地质调查项目(1996014;19991300013051;0199202054)

摘　　要：渤海湾西岸滨海平原1∶50000区域地质调查发现晚第四纪地层多次出现沉积间断。深入的岩石与生物地层、年代地层、磁性地层和气候地层等多重地层学研究及与深海氧同位素曲线的对比表明,这些间断均与寒冷气候有关。氧同位素曲线证实,全球相对寒冷气候时期几乎占过去180万年时间的一半[1],这为本区的寒冷导致间断的推断提供了依据。这些间断可以分为两类,一类即通常为人们熟知的具明显侵蚀面的间断;另一类为极缓慢的沉积(即在空间上占有一定的厚度,并非象第一类那样仅占一个侵蚀面)的层段。作为地层划分重要组成因素,对间断的重视与深入研究,在重建第四纪地质环境演变历史和地层划分中具有重要意义。Through the litho-, bio-, magneto-, and chronostratigraphi studies, a number of depositional hiatuses have been found recently during our 1∶50 000 coastal mapping on the west coast of Bohai Bay. All these hiatuses are correlated to the cool/cold events revealed by the oxygen curve of deepsea cores. Furthermore, such hiatuses can be divided into two categories: (1) with a sharp erosion boundary; (2) recording very slow deposition rate, i.e. possessing a relative thin thickness rather than erosional surface. As being an important factor comprising stratigraphi framework, the hiatuses are significant for better understanding the local Quaternary geo-environmental development.

关 键 词：渤海湾西岸 晚第四纪 沉积间断 寒冷期 

分 类 号：P534.63[天文地球—第四纪地质学]