MODELS OF LOESS STRATIGRAPHICAL STRUCTURE ON THE TERRACES IN THE LOESS PLATEAU OF CHINA
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摘要: 流经黄土高原的黄河及其支流因受地壳不断间歇性隆升的影响而形成了5-6级阶地,这些阶地多系黄土覆盖阶地。以六盘山为界,河谷阶地黄土地层结构可分为东、西阶地地层区。六盘山以西河流阶地一般为6级。第6级阶地(T6)冲积黄土状土之上全系无层理黄土,厚310~505 m,含21-23层古土壤,是迄今世界上最厚的黄土剖面,黄土开始堆积的时间不早于1.43 MaBP。T5上的黄土厚200~400 m,含14-16层古土壤,黄土最早是在1.23 MaBP开始堆积的。T4上的黄土厚100~200 m,含5-6层古土壤,开始沉积时间为0.62 MaBP。T3上的黄土包括L1和S1,厚40~65 m,形成于0.12 MaBP。T2冲积黄土状土之上的风积黄土厚20~35 m,形成时间约为0.03 MaBP。T1冲积黄土状土之上为S0、L0及MS,厚1.5~2.5 m,形成时间不早于0.01 MaBP。六盘山以东的河谷阶地一般为5级。T5风积黄土厚70~90 m,含11-16层古土壤,黄土开始堆积时间不早于1.23 MaBP。T4黄土厚40~70 m,含8-9层古土壤,形成时间不晚于0.80 MaBP。T3的黄土包括L1-S6之间的土层,厚25~45 m,形成于0.62 MaBP。T2的黄土由L1和S1构成,厚10~17 m,形成于0.12 MaBP。T1冲积黄土状土之上为S0、L0及MS,厚1.5~2.5 m,形成时间不早于0.01 MaBP。Abstract: There are generally 5~6 terraces along the main rivers and their affluents in the Loess Plateau.The loess is overlying these terraces like mantles.Divided by the Liupanshan Mts.,the loess stratigraphical structure on the terraces may be subdivided into two stratigraphical regions:the west and the east.
In the west region,the highest terrace is terrace VI,on which loess section is about 310~505 m thick with 21~23 layers of paleosol,being the thickest loess deposits in the world at present.The loess on terrace VI began to form during 1.43 MaBP.Loess on the terrace consists of layers of soil from L1 to S14 or S16,200~400 m in thickness,and dated at about 1.23 MaBP.Terrace IV loess is made up of layers of soil from L1 to S5 or S6,100~200 m in thickness and dated at about 0.62 MaBP.Terrace Ⅲ loess consists of L1 and S1,about 40~65 m in thickness and dated at about 0.12 MaBP.Terrace Ⅱ loess is about 20~35 m thick and dated at about 0.03 MaBP.Terrace I loess consists of black loam(S0),and upper loess(L0),2~3.5 m in thickness,and dated at about 0.01 MaBP.
In the east region,there are generally I-V terraces,which are overlaid by loess,but loess thickness is thinner.Terrace V loess:about 70~90 m thick,with 11~16 layers of paleosol,and dated at about 1.23 MaBP.Terrace IV loess:layers of soil from L1 to S8 or S9,about 40~70 m thick and dated at about 0.80 MaBP.Terrace Ⅲ loess:layers of soil from L1 to S6,about 25~45 m thick and dated at about 0.62 MaBP.Terrace Ⅱ loess:L1 and S1,10~17 m thick,and dated at 0.12 MaBP.Terrace I loess consists of S0,L0 and MS,about 2.0 m in thickness and dated at about 0.01 MaBP.-
Keywords:
- terrace /
- loess strata /
- structure model /
- Loess Plateau
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[1] Sadao Sasajima,WANG Yong-yan.The Recent Research of Loess in China[M].Kyoto University and Northwest University,Japan,1984:1-30.
[2] 王永焱,世岛贞雄.中国黄土研究的新进展[M].西安:陕西人民出版社,1985:1-20.[WANG Yong-yan,Sado Sasajima.The recent research of loess in China[M].Xi'an:Shaanxi People Press,1985:1 -20.]
[3] 王永焱,林再贯.中国黄土的结构特征及物理性质[M].北京:科学出版社,1990:10-30.[WANG Yong-yan,LIN Zai-guan.Texture characteristics and physico-mechanical properties of loess in China[M].Beijing:Science Press,1990:10 -30.]
[4] 刘东生.黄土与环境[M].北京:科学出版社,1985:50-150.[LIU Tung-sheng.Loess and Environment[M].Beijing:Science Press,1985:50 -150.]
[5] 张宗祜,张之一,王芸生.中国黄土[M].北京:地质出版社,1989:45-56.[ZHANG Zong-hu,ZHANG Zhi-yi,WANG Yun-sheng.Loess in China[M].Beijing:Geological Publishing House,1989:45 -56.]
[6] 王永焱.兰州黄土的形成时代问题[J].地质科技,1978(4):76-84.[WANG Yong-yan.Formation age of loess in Lanzhou[J].Geological Science and Tochnology,1978 (4):76-84.]
[7] Burbank D W,LI Ji-jun.Age and paleoclimatic significance of the loess of Lanzhou,China[J].Nature,1985,316(4):141-143.
[8] 曹继秀,徐齐治,张宇田,等.兰州九州台黄土-古土壤系列与环境演化研究[J].兰州大学学报自然科学版,1988,24(1):118-122. [CAO Ji-xiu,XU Qi-zhi,ZHANG Yu-tian,et al.Study on the loess-paleosol sequence and environmental change from Jiuzhoutai,Lanzhou[J].Journal of Lanzhou University(Nature Science),1988,24(1):118-122.]
[9] 岳乐平,雷祥义,屈红军.兰州九州台黄土剖面古地磁研究[J].西北大学学报自然科学版,1992,22(1):82-94 [YUE Le-ping,LEI Xiang-yi,QU Hong-jun.Paleomagnetic research of loess section from Jiuzhoutai,Lanzhou[J].Journal of Northwest University(Nature Science),1992,22(1):82-94.]
[10] 潘保田,李吉均,朱俊杰,等.兰州地区黄河阶地发育与地貌演化[M]//中国西部第四纪冰川与环境.北京:科学出版社,1991:271-277.[PAN Bao-tian,LI Ji-jun,ZHU Jun-jie,et al.Terrace development of the Yellow River and geomorphic evolution in Lanzhou area[M]//Quatrnary Glacier and Environment Research in West China.Beijing:Science Press,1991:271 -277.]
[11] 岳乐平,雷祥义,屈红军.黄河中游水系的阶地发育时代[J].地质论评,1997,43(2):186-192. [YUE Le-ping,LEI Xiang-yi,QU Hong-jun.The age of terrace development in the middle reaches of the Yellow River[J].Geological Review,1997,43(2):186-192.]
[12] 岳乐平,雷祥义,屈红军.靖远黄土剖面磁性地层的初步研究[J].第四纪研究,1991,11(4):349-353. [YUE Le-ping,LEI Xiang-yi,QU Hong-jun.A magneto-stratigraphical study on the Jingyuan loess section,Gansu,China[J].Quaternary Sciences,1991,11(4):349-353.]
[13] 岳乐平.我国黄土古地磁学研究新进展[J].地质论评,1985,31(5):453-460. [YUE Le-ping.New progress in the paleomagnetic study of loess[J].Geological Review,1985,31(5):453-460.]
[14] 岳乐平.蓝田段家坡黄土剖面磁性地层学研究[J].地质论评,1989,35(5):480-488. [YUE Le-ping.Magnetostratigraphical study of the loess section at Duanjiapo,Lantian[J].Geological Review,1989,35(5):480-488.]
[15] 丁仲礼,刘东生.中国黄土研究新进展(一):黄土地层[J].第四纪研究,1989,9(1):24-35. [DING Zhong-li,LIU Tung-sheng.Progresses of loess research in China:(Part I) loess stratigraphy[J].Quaternary Sciences,1989,9(1):24-35.]
[16] 雷祥义,屈红军,岳乐平.灞河阶地黄土-古土壤系列及其年代意义[J].西北大学学报自然科学版,1992,22(2):219-226. [LEI Xiang-yi,QU Hong-jun,YUE Le-ping.Loess-paleosol sequence at terrace of Bahe River and its significance of age[J].Journal of Northwest University(Nature Science),1992,22(2):219-226.]
[17] 安芷生,肖举乐,张景昭,等.季风与最近13万年黄土高原的气候历史[M]//黄土·第四纪地质·全球变化.北京:科学出版社,1990:108-114.[AN Zhi-sheng,XIAO Ju-le,ZHANG Jing-zhao,et al.Monsoon and climatic history during the last 130000 years in Loess Plateau[M]//Loess,Quaternary Geology and Global Change.Part Ⅱ.Beijing:Science Press,1990 :108-114.]
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