华北平原西南部石垄地貌的成因机理与古环境意义  

THE FORMATION PROCESS AND PALEOENVIONMENT SIGNIFICANCE OF STONE RIDGE LANDFORMS ON NORTH CHINA PLAIN

作　　者：王然[1] 李庆辰[1] 徐全洪[1] 

机构地区：[1]河北省科学院地理科学研究所,石家庄050011

出　　处：《第四纪研究》2012年第6期1255-1260,共6页Quaternary Sciences

基　　金：国家自然科学基金项目(批准号:49271016);河北省自然科学基金项目(批准号:D2008001160)共同资助

摘　　要：华北平原西南部的石垄地貌位于河北省邯郸市西北10km的黄土台地区,由沿北东方向延伸的1条大石垄和9条小石垄组成。野外调查、测量资料和室内分析数据表明,垄岗状地貌由钙质胶结的古沼河入宁晋泊的河口三角洲分流河道沉积沙体组成,形成于晚更新世晚期的玉木Ⅱ与玉木Ⅲ之间的间冰阶,距今约2.86万年。垄岗上的"V"型裂口是在玉木盛冰期期间,三角洲上的分流河道沙体暴露于气下,在脱水干缩过程中形成的横切裂隙,与泥裂的成因类似。沿分流河道沙体下泄的富含碳酸钙的地下水在此渗出或溢出,形成了裂隙两侧脊状突起和大石垄左侧的分支状钙板堆积体。伴随邯郸断裂在晚更新世末期以来的强烈活动,紫山断块快速隆升,由此阻断了南沼河向东的自然流路,使其在清化附近被迫改为向北流,在大油村汇人沼河干流。邯郸断裂的正向滑动所引起的地层旋转,使得局部地层倾向逆转,由此造成了垄状沙脊整体向北东方向以5°的仰角翘起。The stone ridges landform is situated in the southwest part of the North China Plain.It is about 10 kilometers from to the northwest of Handan City,Hebei Province.The stone ridge landforms consist of one big stone ridge and 9 small ridges which were unearthed by the local peasants when they excavated earth to make brick in 1988.The big stone ridge is 44.7meters long,4.3meters wide and 2.5meters high,the small stone ridges are from 30meters to 35meters long,from 1.9meters to 2meters wide and 1meter high.The total length of the stone ridges is about 300meters.The stone ridges with the thin shape and brownish-yellow color developed a V-shaped cross vent every 0.5meter-1meter on the stone ridge bodies,overall observation,the thin shaped stone ridges arranged in good order looks like a row of spinal bone of vertebrates,and so far as to there is a ＂dragon claw＂ growing out of the left side of the big stone ridge.The stone ridges had caused a sensation throughout the country after the program ＂Approaching Science＂ of CCTV 10 broadcasted on 8~14,April,2008.Therefore it is inferred that the stone ridges are the vertebrate fossils or authenticating object for the Zhao emperors.But the authors,based on the field spot investigation and laboratorial analyses,find that the observed unidirectional oblique one-way tilt sedimentary bedding on the profile section and trough cross sedimentary bedding on the cross section,the measurement of the stone ridges extend direction in the field spot,and the results of size-frequency analyses,as well as the psephicity estimate and composition determine of the sand body,and hydrochloric acid reaction in the laboratory,indicate that the stone ridges are calcium carbonate cemented palaeochannel sand bodies which deposited in the ancient-Minghe delta area during the Würm Interglacial Epoch from Würm Ⅱ to Würm Ⅲ Glaciation Epoch about 28.6kaB.P.in the Last Pleistocene.The V-shaped vents are the cross crevasses formed during the dehydration process of branch palaeochannel sand bodie

关 键 词：华北平原石垄地貌 邯郸断裂 洛河古河道 河口三角洲 玉木冰期 

分 类 号：P941.75[天文地球—自然地理学]