globalchange  > 气候变化与战略
CSCD记录号: CSCD:5622990
论文题名:
青海湖地区晚第四纪黄土的物质来源
其他题名: Provenance of the Late Quaternary Loess Deposit in the Qinghai Lake Region
作者: 曾方明
刊名: 地球科学
ISSN: 1000-2383
出版年: 2016
卷: 41, 期:1, 页码:201-208
语种: 中文
中文关键词: 青海湖 ; 黄土 ; 物质来源 ; 元素地球化学
英文关键词: Qinghai Lake ; loess ; provenance ; elementary geochemistry
WOS学科分类: GEOLOGY
WOS研究方向: Geology
中文摘要: 青海湖地区的晚第四纪黄土记录了湖区晚第四纪以来的环境和气候变化.迄今为止, 对于青海湖地区晚第四纪黄土物质来源的研究较薄弱.以青海湖东岸的种羊场晚第四纪风成沉积剖面为主要研究对象, 在青海湖区及其周边采集了黄土、风成砂、湖相沉积、河流沉积等样品, 结合黄土高原西部临洮黄土样品, 对它们的元素组成(<75mum的硅酸盐组分)进行了对比研究.初步结果表明:(1)K_2O/Al_2O_3(摩尔比)和Zr/Ti、Zr/Nb比值显示青海湖地区的风成沉积显著区别于本区的河流沉积和湖相沉积;(2)青海湖地区的晚第四纪黄土与黄土高原西部临洮黄土的K_2O/Al_2O_3和Zr/Ti、Zr/Nb比值相一致;(3)青海湖地区的晚第四纪黄土可能来自柴达木盆地.
英文摘要: Late Quaternary loess deposit is widely distributed in the Qinghai Lake region and adjacent area.The loess deposit independently recorded the environmental and climatic changes during the late Quaternary in the Qinghai Lake region, northeastern Qinghai-Tibetan Plateau.Nearly all studies are focused on reconstructing the environmental and climatic changes recorded by loess deposit in the Qinghai Lake region.However, up to now, the provenance of the loess deposit in the Qinghai Lake region is still poorly understood.Here we present the elemental concentration of the silicate fraction of the eolian deposit (<75mum) from the ZYC section in the Qinghai Lake region and LT section at Lintao County on the western Chinese Loess Plateau, loess deposits at Guanjiaoshan Mountain, Chaka town and Wulan County, eolian sands at western and eastern shore of the Qinghai Lake, and fluvial deposits from the Buhahe river and lacustrine deposits at Erlangjian site in the Qinghai Lake region. The results show that:(1)K_2O/Al_2O_3(molar ratio)and Zr/Ti, Zr/Nb ratios indicate that the eolian deposits in the Qinghai Lake region and adjacent area can be distinguished clearly from the local deposits represented by river deposits at Buhahe river and lacustrine deposits at Erlangjian in the drainage basin of Qinghai Lake;(2)There is similarity of the elemental ratios(K_2O/Al_2O_3 and Zr/Ti, Zr/Nb)between the eolian deposits in the Qinghai Lake region and loess deposits at Lintao County. Thus, the eolian deposits in the Qinghai Lake region and Lintao County may have the same source region;(3)Late Quaternary loess deposit in the Qinghai Lake region is probably sourced from the Qaidam basin.
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/150653
Appears in Collections:气候变化与战略

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作者单位: 中国科学院青海盐湖研究所, 西宁, 青海 810008, 中国

Recommended Citation:
曾方明. 青海湖地区晚第四纪黄土的物质来源[J]. 地球科学,2016-01-01,41(1):201-208
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