临沂九曲沂河大桥附近沂河古河槽特征
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摘要
选择临沂九曲沂河大桥附近沂河断面作为研究剖面。根据九曲沂河大桥的地质勘探钻孔资料,绘制了沂河古河槽地质剖面示意图。沿勘探钻孔进行了浅层地震影像法物探。在下游的G327沂河大桥附近河槽底部和上游约3km祊河右岸的埋藏阶地上采集了年代样品,获得了1个光释光年代、2个14 C年代。结论认为:沂河古河槽底部断裂带、裂隙发育;九曲沂河大桥附近约53~55m以下河槽为末次盛冰期时沂河、祊河的古河槽,当时祊河在九曲沂河大桥的下游汇入沂河;约54m以上为晚冰期以来沂河河槽,晚冰期以后,祊河约在现在入沂河的位置注入沂河。由于河槽宽浅,流量季节变化大,形成分汊—辫状河特征。
The stratigraphical cross-section near the Jiuquyihe River Bridge of Linyi City,Shandong Province,China was selected as the research zone.The stratigraphical cross-sections of paleo-valley were established with bore datum near Jiuquyihe River Bridge.The geophysical seismic imaging method of shallow stratigraphy was applied to detect drilling.Data of one OSL dating was obtained through the analysis of the sample from the paleo-valley bottom near the G327 Yihe River Bridge and of two14 C dating were obtained through analysis of samples in burial terrace of the Benghe River.It is concluded that the Yihe River's paleo-valley is located on the fault zone.In the Last Glacial Maximum,the paleo-valley of the Yihe River and the Benghe River lay 53-55 mbelow and near the Jiuquyi River Bridge.During the Last Glacial Maximum,the Benghe River flowed into the Yihe River in the downstream of the Jiuquyihe River Bridge.The paleo-valley of the Yihe River lay 54 mabove the Late Glacial.After the Late Glacial,the Benghe River flowed into the Yihe River at the present location.The Yihe River's paleo-valley has a relatively large width-depth ratio which means a wide and shallow river channel,with the characteristics of braided river.
The stratigraphical cross-section near the Jiuquyihe River Bridge of Linyi City,Shandong Province,China was selected as the research zone.The stratigraphical cross-sections of paleo-valley were established with bore datum near Jiuquyihe River Bridge.The geophysical seismic imaging method of shallow stratigraphy was applied to detect drilling.Data of one OSL dating was obtained through the analysis of the sample from the paleo-valley bottom near the G327 Yihe River Bridge and of two14 C dating were obtained through analysis of samples in burial terrace of the Benghe River.It is concluded that the Yihe River's paleo-valley is located on the fault zone.In the Last Glacial Maximum,the paleo-valley of the Yihe River and the Benghe River lay 53-55 mbelow and near the Jiuquyi River Bridge.During the Last Glacial Maximum,the Benghe River flowed into the Yihe River in the downstream of the Jiuquyihe River Bridge.The paleo-valley of the Yihe River lay 54 mabove the Late Glacial.After the Late Glacial,the Benghe River flowed into the Yihe River at the present location.The Yihe River's paleo-valley has a relatively large width-depth ratio which means a wide and shallow river channel,with the characteristics of braided river.
引文
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[2]Li C,Wang P,Sun H,et al.Late Quaternary incised-valley fill of the Yangtze delta(China):Its stratigraphic framework and evolution[J].Sedimentary Geology,152(2002):133-158.
[3]李从先,李萍,成鑫荣.海洋因素对镇江以下长江河段沉积的影响[J].地理学报,1983,38(2):128-140.
[4]袁迎如.东海大陆架外部的晚更新世晚期长江河口[J].海洋学报,1992,14(6):85-89.
[5]杨达源.晚更新世冰期最盛时长江中下游地区的古环境[J].地理学报,1986,41(4):302-310.
[6]刘振夏,Berne S,L’ATALANTE科学考察组.东海陆架的古河道和古三角洲[J].海洋地质与第四纪地质,2000,20(1):9-14.
[7]李广雪,刘勇,杨子赓,等.末次冰期东海陆架平原上的长江古河道[J].中国科学D辑(地球科学),2005,35(3):284-289.
[8]夏东兴,刘振夏.末次冰期盛期长江入海流路探讨[J].海洋学报,2001,23(5):87-95.
[9]曹光杰,李彦彦.末次盛冰期长江南京段古河槽特征[J].海洋地质与第四纪地质,2009,39(3):39-42.
[10]曹光杰,王建,张学勤,等.末次盛冰期长江南京段河槽特征及古流量[J].地理学报,2009,64(3):331-338.
[11]曹光杰,爨景波,李彦彦.长江江苏段末次盛冰期古河槽特征[J].地理科学,2012,32(8):986-992.
[12]刘奎,庄振业,刘冬雁,等.长江口外陆架区埋藏古河道研究[J].海洋学报,2009,31(5):80-88.
[13]张祖陆.鲁北平原黄河古河道初步研究[J].地理学报,1990,45(4):457-466.
[14]吴忱,朱宣清,何乃华,等.华北平原古河道的形成研究[J].中国科学B辑,1991,(2):188-197.
[15]吴忱,王子惠,许清海.河北平原的浅埋古河道[J].地理学报,1986,41(4):332-340.
[16]黄镇国,张伟强,蔡福祥.珠江水下三角洲[J].地理学报,1995,50(3):206-214.
[17]Lin C M,Zhuo H C,Gao S.Sedimentary facies and evolution in the Qiantang River incised valley,eastern China[J].Marine Geology,2003,219:235-259.
[18]傅先兰,李容全.淮南地区淮河故道的初步研究[J].北京师范大学学报(自然科学版),1998,34(2):276-279.
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