末次冰期最盛期沂河汤头—刘道口段古河槽特征*
投稿时间:2016-07-27  最后修改时间:2016-10-01  点此下载全文
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作者单位E-mail
曹光杰 临沂大学资源环境学院 guangjiecao@163.com 
闫克超 临沂大学  
吴婷 临沂大学  
单婉婉 临沂大学山东师范大学  
刘卫国 临沂大学  
曹原 临沂大学  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:选择沂河汤头—刘道口段作为研究河段。在船流街—解家庄断面进行了电测法物探和钻探工作。搜集了柳杭橡胶坝、解放路沂河大桥、陶然路沂河大桥、罗程路沂河大桥等钻孔资料。根据物探、钻探结果及钻孔资料,绘制了船流街—解家庄、柳杭橡胶坝附近、解放路沂河大桥附近、陶然路沂河大桥附近及罗程路沂河大桥附近5个断面的沂河古河槽地质剖面示意图。在船流街剖面、解家庄剖面、柳杭剖面、祊河南岸剖面及陶然路大桥附近沂河河槽底部采集了14C及光释光(OSL)年代样品,样品分别在美国BETA实验室、北京大学AMS 14C实验室、南京师范大学光释光实验室等进行了测试,获得了22个年代结果。结论认为,船流街附近约70m以下、柳杭橡胶坝附近约69.53m以下、解放路沂河大桥附近约55.09m以下、陶然路沂河大桥附近约50.36m以下、罗程路沂河大桥附近约56.35m以下的河槽,为末次冰期最盛期时的沂河古河槽,古河槽宽深比较大,河槽宽浅;沂河古河槽底部基岩岩性复杂,断裂带发育。由于断裂构造、岩性、支流汇入等,沂河古河槽在解放路沂河大桥、陶然路沂河大桥附近形成局部深切;末次冰期最盛期,沂河汤头—刘道口段属于辫状河。
中文关键词:末次冰期最盛期  沂河  古河槽  辫状河
 
Characteristics of the Yihe River Paleo-valley in the Last Glacial Maximum in Tangtou-Liudaokou Reach
Abstract:The Tangtou-Liudaokou reach of the Yihe River is selected as research subject. The authors carry out electrical sounding and drilling work at Chuanliu Jie-XiejiaZhuang cross section. Drilling data of Liuhang rubber dam, Jiefang Road Yihe Bridge, Taoran Road Yihe Bridge and Luocheng Road Yihe Bridge are seclected. Based on electrical sounding and drilling results and the drilling data, five pieces of stratigraphical cross section maps for incised valley of the locations above are draw. After that, OSL samples of Chuanliujie cross section, Xiejiazhuang cross section, Liuhang cross section, Benghe River south shore and riverbed near Taoran Road Bridge are collected. The samples above are tested at the BETA Analytic Radiocarbon Dating Laboratory, AMS 14C Laboratory at Peking University and OSL laboratory at Nanjing Normal University by 14C and OSL methods. Twenty-two results are got and the conclusions are as follows. The incised valley of the depth about -70m near Chuanliujie drill, about -69.53m near Liuhang rubber dam drill, -55.09m near Jiefang Road Yihe River Bridge drill, -50.36m near Taoran Road Yihe River Bridge drill and -56.35m near Luocheng Yihe River Bridge drill are incised valley at the last glacial maximum period. The lithological characters at the bottom of Yihe River channel are complicated. Local deep cut were developed at Jiefang Road Yihe River Bridge and Taoran Road Yihe River Bridge because of fracture structure, lithology and branch inflows. Yihe River incised valley’s breadth depth ratio is large, the channel is wide and shallow, so it belongs to braided river.
keywords:Last Glacial Maximum  Yihe River  Paleo-valley  Braided river
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