Element Geochemical Characteristics and the Flood Changes at the Holocene Profiles in Jinghe Valley of Jingyang
详细信息
- 责任者：Gu Jing (Institute of Geographic Sciences and Natural Resources ; CAS ; Beijing 100101 ; China) ; Zhou Jie
- 刊名：Journal of Mountain Research
- 出版年：2013
- 卷期：31(2)
- 关键词：全新世 ; Holocene ; 元素地球化学 ; elements geochemistry ; 河流沉积物 ; stream sediments ; 陕西 ; Shaanxi Province
- 页码：p.184-193
- 图表：illus., 1 table, 36 refs.
- 分类号：1400
- issnNo：ISSN1008-2786
- isbnNo：CN51-1516/P
摘要
Based on the grain size and geochemical element from the 285 samples taken in the front of the first terrace at the Jinghe vally of Jingyang,the relationship between the element geochemical characteristics and the flood changes at the Holocene was studied.The results show that the content of Mn,Ni,Cu,Zn,Ga,Pb,Sc,Ti,Nb,Th,U,Rb,V,Ba,Co,Al2O3,Fe2O3 and K2O change obviously in the profile.Each component changes obviously in the entire profile,which can clearly reflect the variations of flood and precipitation with high resolving power.The profile may be divided into 41 sediment layers,indicating 41 flood events at different scales and 41 years with much precipitation.The finer grain size is,the higher contents of Mn,Ni,Cu,Zn,Ga,Pb,Sc,Ti,Nb,Th,U,Rb,V,Al2O3,Fe2O3 and K2O are and the lower content of Ba,Co are,which indicates small flood intensity,low flood level,and less precipitation in deposition.In contrast,the coarser grain size is,the lower contents of Mn,Ni,Cu,Zn,Ga,Pb,Sc,Ti,Nb,Th,U,Rb,V,Al2O3,Fe2O3 and K2O are and the higher content of Ba,Co are,which indicates high flood intensity,high flood level,and more precipitation at deposition.The floods of Jingyang reach at Jing River represent the floods of Jing River basin in Loess Plateau.Catastrophic floods and big floods came from the whole drainage basin of the Jing River or the large parts of the basin.Moderate floods came from the small parts of the basin.There are three causes to cause flooding in Jing River,i.e drastic increase in annual precipitation,episodic rainstorm without increase in annual precipitation and concentrative and longtime rainfall without increase in annual precipitation.The flood sediments in the section of JYc were supposed to be resulted from the moderate flooding disaster,big flooding disaster and catastrophic disaster.
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