1. 天津市海洋地质勘查中心 天津 300170; 2. 国土资源部天津地质矿产研究所 天津 300170; 3. 天津华北地质勘查局地质研究所 天津 300170; 4. University of Texas at San Antonio Texas 78249-1644 USA; 5. 中国科学院地质与地球物理研究所 北京 100029; 6. 国家海洋信息中心 天津 300171; 7. 天津市地质矿产勘查开发局 天津 300191
Segmentation and grouping for the Holocence epoch stratain the west coast of Bohai Gulf
Yue Jun1,2,3, Dong Yue4, Zhao Xitao5, Zhang Baohua1,3, Mu Lin6, Han Fang1,3, Wang Guoming2, Zhao Changrong2, Zhang Baiming7, Xiao Guoqiang2, Li Jianfen2
1. Tianjin Marine Geology Exploration Center, Tianjin 300170; 2. Tianjin Institute of Geology and Mineral Resources, CGS, Tianjin 300170; 3. Geological Research Institute of North China Geological Exploration Bureau, Tianjin 300170; 4. University of Texas at San Antonio, Texas 78249-1644 USA; 5. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029; 6. Institute of Marine Science and Technology Information, State Oceanic Administration People's Republic of China, Tianjin 300160; 7. Tianjin Geology and Mineral Bureau, Tianjin 300752
Based on the projects of "Comprehensive Geological Survey in Ninghe County,Tianjin","Comprehensive Geological Survey in Jinghai County,Tianjin" and "Qilihai Geological Park",a few drilling holes are setted out in this area,take ZK01-ZK09 holes,BHN10 hole and BJM18 hole,SQ01-SQ29 holes and TK01-TK09 holes for example,the stratotype section of the Holocence epoch strata in the west coast of Bohai Gulf are segmented and divided into groups.According to stratigraphic code and grouping requirement,combing the data of lithologic stratigraphy,chronostratigraphy,chemistry strate and biological assemblages strate,the author divided the stratotype section of the holocence epoch strata into three groups:Duliuzhen group,Dahuangwa group,Xizhaizhuang group.The segmentation boundary between upper Holocence Duliuzhen group profiles and middle Holocence Dahuangwa group profiles are from 5.10 m to 5.25 m; the segmentation boundary between middle Holocence Dahuangwa group profiles and lower Holocence Xizhaizhuang group profiles are from 13.80 m to 14.10 m; the segementation boundary between lower Holocence Xizhaizhuang group profiles and lower Pleistoncene Tanggu group profiles are from 18.48 m to 18.70 m.The division of Ⅰ～Ⅴ cold climate section is accordance with the chemical environment related indexes,for example,the content of CaCO3,pollen paleotemperature and the retio of Rb/Sr.The division of Ⅰ·～Ⅴ· oxidation-reduction zone is accordance with the comprehensive analysis for the concentration curve of Corg/P2O5、Fe2+/Fe3+.