干旱区生态环境知识资源中心(Arid): 黄河柳林滩段全新世古洪水滞流沉积物物源研究

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	黄河柳林滩段全新世古洪水滞流沉积物物源研究
其他题名	Study on Provenance of Holocene Flood Slackwater Deposits in the Liulintan Reach of the Yellow River
	刘雯瑾; 黄春长; 庞奖励; 查小春; 赵雪如; 胡贵明; 石彬楠
来源期刊	水土保持学报
ISSN	1009-2242
出版年	2016
卷号	30 期号:2 页码:136-142
中文摘要	通过对黄河中游进行古洪水沉积学研究和水文学研究,为超长尺度水文学提供数据基础。对黄河中游晋陕峡谷段进行详细的考察,在黄河窟野河口右侧柳林滩附近发现3层全新世古洪水滞流沉积物(SWD)。光释光(OSL)测年结果表明,这一期3次古洪水事件分别发生在11 800~11 000 aB.P.,10 800~10 200 a B.P.,10 600~9 600 aB.P.。通过对样品进行磁化率、烧失量、粒度成分、化学元素和扫描电镜的试验分析,确定其为河流悬移质泥沙在高水位滞流环境下的产物,是典型的古洪水滞流沉积物。其中,古洪水SWD的磁化率和烧失量较古土壤低,说明其是新鲜的滞流沉积物,未受到风化成壤作用的影响。3层古洪水SWD的自然分布频率曲线都呈现单峰,峰态尖锐,为极正偏态,说明其分选性好。扫描电镜的分析表明,3层SWD属于河流沙,偏关县L0属于典型的黄土风积粉砂。不同层次的沉积物记录了不同期次的古洪水事件,反映出其水动力大小的不同或物质来源的差异。结合粒度分析和化学元素的结果,确定古洪水SWD2、SWD3与现代洪水SWD均为细沙质粉沙,化学成分相同,表明是黄河主流大洪水悬移质沉积形成。古洪水SWD1为中沙,与SWD2、SWD3在常量元素和重金属元素含量上有显著差异,而与前人在毛乌素沙漠地区所进行的粒度和元素分析结果接近,说明本层古洪水SWD是支流窟野河流域暴雨洪水从毛乌素沙漠地区侵蚀搬运而沉积下来的物质。该研究成果为今后准确鉴别古洪水SWD及来源判断提供参考借鉴。
英文摘要	The data generated from palaeoflood hydrology will facilitate an appropriate assessment of these flood events and the regional response of the hydrological system to global climatic change at a long time scale.Palaeoflood slackwater deposit(SWD)is a major evidence used for inference about hydrological parameters of the past flood events.Field investigation was carried out in Shaanxi province along the middle reaches of the Yellow River.A set of 3 layers of palaeoflood SWD at the Liulintan(LLT)site was sampled and investigated in detail.According to the OSL dating results,3 palaeoflood events respectively were determined to be in 11 800 to 11 000a B.P.,10 800to 10 200aB.P.,and 10 600to 9 600aB.P.Analysis of the magnetic susceptibility,ignition loss,grain-size distribution,chemical element and scanning electron microscope results indicated that these SWD were generated through the deposition of suspended sediments under high water level hesitation environment,belonging to the typical palaeoflood slackwater deposit.The magnetic susceptibility and losson- ignition of the slackwater deposits were low because they were newly deposited and unaffected by weathering and pedogenesis.The shapes of particle-size distribution curves of the 3layers of slackwater deposits were high and thin(single peak),showing the good sorting characteristics of SWD.According to the analysis of the scanning electron microscope,3layers of SWD belonged to river sand and the L0of Pianguan county belonged to typical loess-aeolian silt sand.Different levels of sediment recorded the different palaeoflood events,which reflected the differences in hydrodynamic size and material sources.The results of grain size and chemical element analysis indicated that 3layers of SWD belonged to fine silt sand and were sourced from the suspended sediment of floodwater of main stream of Yellow River.Among these sediments,SWD1was different from others in the contents of major elements and heavy metal elements,but was similar with the sediment matter formed by the corrosion and transportation of the rainstorm and flood of the Kuye River,which flowed through the desert of Maowusu.The study can provide reference for future identification of palaeoflood slackwater deposits and their sources.
中文关键词	古洪水 ; 滞流沉积物 ; 全新世 ; 黄河中游
英文关键词	palaeoflood slackwater deposit Holocene middle reaches of the Yellow Rive
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:5694174
来源机构	陕西师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234970
作者单位	陕西师范大学旅游与环境学院, 西安, 陕西 710062, 中国
推荐引用方式 GB/T 7714	刘雯瑾,黄春长,庞奖励,等. 黄河柳林滩段全新世古洪水滞流沉积物物源研究[J]. 陕西师范大学,2016,30(2):136-142.
APA	刘雯瑾.,黄春长.,庞奖励.,查小春.,赵雪如.,...&石彬楠.(2016).黄河柳林滩段全新世古洪水滞流沉积物物源研究.水土保持学报,30(2),136-142.
MLA	刘雯瑾,et al."黄河柳林滩段全新世古洪水滞流沉积物物源研究".水土保持学报 30.2(2016):136-142.