论文-某师范大学主校区中上全新统沉积物特征研究.doc

题目：天津师范大学主校区中上全新统沉积物特征研究  天津师范大学主校区中上全新统沉积物特征研究 摘要：通过对渤海湾西北岸天津师范大学主校区内深达11m的SD钻孔和深度为1.45m的剖面进行连续取样，运用粘土混浊水电导率测定方法对其进行海陆相演替变化分析，经实验证明天津师范大学主校区所在地区陆相沉积厚度至少在11m以上，天津师大或为全新世最大海侵的边缘或由于地壳下降导致海相层处于地11m以下的位置。 关键词：天津平原；中上全新统；粘土混浊水电导率  Tianjin Normal University the Middle-upper Holocene Sediments’ Features Research Abstract: This paper based on many samples made?continuous in the main campus of Tianjin Normal University, which located in the northwestern shore of Bohai Bay. These?samples were collected from 11?meters deep?borehole marked SD and 1.45 meters deep SD-1?profile. We engrain method of determine clay-water electric conductivity measuring to analysis its sea continental succession changing and get a conclusion that proved by the experiment said :(1) Tianjin Normal University main campus of the area where the continental sediments thickness at least in more than 11meters,Tianjin?Normal University?is perhaps the Holocene?transgression?maximum?edge. Another?possible, caused marine?layer at?11 meters below?ground?location due to crust?down.(2)Two characteristics of sediment: clay -water?electric conductivity?and pH?value of the?curve showing anti-related trends, in short, the conductivity is greater, pH value is smaller. (3)Considering this location maybe the fallout of the ancient continental river sediment or lead to layer of continental deposits more thick, we needs further study. Key words: Tianjin plain; Middle-upper Holocene; clay -water?electric conductivity? 目 录 1 引言 1 2 研究区域的自然地理概况 4 2.1 地理位置 4 2.2 地质条件和地貌条件 5 2.3 气候条件 5 2.4 海岸线条件 5 2.5 水文条件 6 3 粘土混浊水电导率实验 6 3.1 样品采集 6 3.1.1 样品采集地点 6 3.1.2 采集过程 7 3.1.3 注意事项 7 3.2 实验使用仪器 7 3.3 实验原理 8 3.4 实验过程 9 4 SD孔和SD-1剖面实验结果 9 4.1 SD孔岩性描述 9 4.2 SD孔粘土混浊水电导率与pH值测定结果 10 4.3 SD-1剖面岩性描述 13 4.4 SD-1剖面粘土混浊水电导率与pH值测定结果 13 5 讨论 14 5.1 电导率与天津师大古环境关系讨论 14 5.2 电导率与pH值分布关系讨论 17 6 结论 17 参考文献 18 致谢 19 1 引言 位于渤海湾西岸的天津平原地势低平，是典型的淤泥质平原海岸。第四纪期间主要受到上流河流冲积作用和气候变化、构造运动影响，发生过三次大的海侵海退运动，使得海平面经历了数次上涨与下落，深刻的影响了天津平原沿海地区的沉积物特性。在研究中通过测定该地区下伏沉积物粘土混浊