干旱区生态环境知识资源中心(Arid): 鄂尔多斯高原中部5．84．5Cal kaBP气候旋回的地层记录

Arid

	鄂尔多斯高原中部5．84．5Cal kaBP气候旋回的地层记录
其他题名	Climate Change Recorded in a Lacustrine Stratum in the Ordos Plateau during the Period of 5.8～4.5 Cal kaB. P.
	曹广超 1; 马海州 2; 王晨华 3
ISSN	1001-4675
出版年	2008
卷号	25 期号:2 页码:254-258
中文摘要	通过对鄂尔多斯高原现代风成砂与PJHZ剖面沉积物粒度特征的对比分析，确定了剖面中4个层位（290～210，190～160，153．5～123．5，50～40cm）基本属于风成砂沉积。结合粒度参数、碳酸钙含量、总有机碳含量及年代序列，认为此区域在5．8～4．5Cal kaBP存在以下沉积旋回：～5749Cal aBP，沉积风成砂，反映该时期风砂活动强烈，气候干燥，冬季风强盛；5749Cal aBP前后，沉积物为灰绿色湖相层，表明这一时期存在短暂的湖面扩展，沙漠退缩；5749～5370Cal aBP，沉积风成砂，反映了湖泊的退缩和沙漠的扩展；5370～4895Cal aBP，湖相沉积物，反映了流域降水量的增多；4895～4580Cal aBP沉积风成砂后，4580Cal aBP前后又出现了短暂的湖相沉积，之后又是风砂沉积。
英文摘要	With a view of deriving desertifieation （aeolian action） information from the Mu Us Desert, a sensitive region to climate change, in this paper the volumetric particle size distribution of five modern desert sand samples and 30 profile samples, collected from the Ordos Plateau and the front of low terrace of the Pojianghaizi Lake, is studied. The results show that the grain size characteristics of the samples at depths of 290～ 210 em, 190 ～160 em, 153.5 ～123.5 em and 50 ～40 em at the Pojianghaizi profile are significantly similar to that of modern desert sand, which reveals that the sediment at these depths is the paleo-desert sand （aeolian sand）. Moreover, it is observed that there are 3 layers of laeustrain sediment embedded in the Pojianghaizi profile. The analyzed results of the radiocarbon dating, grain size, TOC and CaCO3 reveal that there was a sediment sequence ranging from 5.8 Cal kaB. P. to 4.5 Cal kaB. P. ： before 5 749 Cal aB. P. , the overlaying aeolian sand layer reveals that an intensive aeolian action occurred under dry-cold climate due to the strong winter monsoon, and it is followed by a thin layer of lacustrine sediment, which reveals that a short episode of desert retreating and lake enlargement occurred ; an aeolian sedimentation occurred during the period from 5 749 to 5 370 Cal aB. P. , which reveals that the desert expanded again; the period from 5 370 to 4 895 Cal aB. P. was characterized by a lacustrine sedimentation with a main composition of clay and silt, indicating the catchment of the Pojianghaizi Lake experienced a significant increase of precipitation; after the aeolian sedimentation with a thickness of 50 em during the period from 4 895 and 4 580 Cal aB. P. , a short period of laeustrain sedimentation occurred.
中文关键词	粒度 ; 湖相沉积 ; 风砂沉积 ; 鄂尔多斯高原
英文关键词	Ordos Plateau grain size lacustrine sedimentation aeolian sedimentation.
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:3221663
来源机构	中国科学院西北生态环境资源研究院 ; 兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/222318
作者单位	1.中国科学院研究生院, 北京 100039, 中国; 2.中国科学院青海盐湖研究所, 西宁, 青海 810008, 中国; 3.兰州大学资源环境学院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	曹广超,马海州,王晨华. 鄂尔多斯高原中部5．84．5Cal kaBP气候旋回的地层记录[J]. 中国科学院西北生态环境资源研究院, 兰州大学,2008,25(2):254-258.
APA	曹广超,马海州,&王晨华.(2008).鄂尔多斯高原中部5．84．5Cal kaBP气候旋回的地层记录.,25(2),254-258.
MLA	曹广超,et al."鄂尔多斯高原中部5．84．5Cal kaBP气候旋回的地层记录".25.2(2008):254-258.