干旱区生态环境知识资源中心(Arid): 毛乌素沙漠东南缘滴哨沟湾剖面DGS1层段粒度特征及其指示的全新世气候变化

Arid

	毛乌素沙漠东南缘滴哨沟湾剖面DGS1层段粒度特征及其指示的全新世气候变化
其他题名	Climate Variations Recorded by the Grain-size from the DGS1 Segment in the Southeast of China′s Mu Us Desert During the Holocene
	舒培仙 1; 李保生 1; 牛东风 2; 王丰年 3; 温小浩 2; 司月君 4; 陈琼 2
来源期刊	地理科学
ISSN	1000-0690
出版年	2016
卷号	36 期号:3 页码:448-457
中文摘要	分析滴哨沟湾剖面全新统DGS1段的粒度数据,认为流动沙丘砂、泥炭、砂质古土壤、古固定-半固定沙丘砂到湖沼相和次生黄土的颗粒总体上变细,分选变差。结合腹足类动物化石和湖沼相地层中石英砂粒表面电镜扫描,认为DGS1粒度结果实际上是全新世以来多次冬夏季风的交互演替过程的气候-地质记录。据此,将DGS1粒度信号记录的全新世气候分为4个阶段全新世早期好转期、全新世鼎盛期、大暖期向寒冷期转变波动期和降温不稳定的沙漠化频繁变化时期。
英文摘要	The DGS1 segment in the Dishaogouwan section from the Salawusu River valley is a typical stratum to study the climate variations in the Holocene. Based on the dating ages and analysis of the grain-size features within the DGS1,we find that the particle gradually becomes finer but the sorting rate becomes poorer from mobile dune sands, peat, paleosols, semi-fixed sand dunes to the lacustrine facies and secondary loess; the grain-size parameter values of Mz(?), sigma1(?), SK1 in the dune sands are lower than those in the lacustrine facies or secondary loess, and the KG value shows opposite trends; the Mz ranges from 2.26 to 3.36 (average 2.55) in the dune sands, 2.33 to 6.33 (average 4.28) in the lacustrine facies and 4.25 to 5.27 (average 4.58) in the secondary loess; the sigma1(?) ranges from 0.51 to 2.51 (average 0.97) in the dune sands, 0.81 to 3.25 (average 2.13) in the lacustrine facies and 1.10 to 2.46 (average 1.46) in the secondary loess; the SK1 ranges from 0.01 to 0.45 (average 0.29) in the dune sands, 0.09 to 0.53 (average 0.32) in the lacustrine facies and 0.22 to 0.38 (average 0.36) in the secondary loess; the KG ranges from 0.92 to 1.70 (average 1.42) in the dune sands, 0.65 to 1.80 (average 1.13) in the lacustrine facies and 1.22 to 1.51 (average 1.44) in the secondary loess. They display distinct variations that correspond to the sedimentary changes. The surface microstructure of the quartz grains in the lacustrine facies under the electron microscope scanning shows typical aeolian characteristics with good roundness, without precipitated silica, but with pits on the surface. Together with the freshwater gastropod fossils discovered in the stratigrapgical layers, we suggest that the grain-size cycles in the DGS1 segment actually reflect the climate variations in the alternation of East Asian winter and summer monsoons in the Holocene, and the climate of the Holocene can be divided into four stages: the warming period of the Early Holocene; Holocene heyday; the fluctuation period from the Megathermal to cold; and the cooling period of instability and desertification. The climate changes in the DGS1 during the Holocene correspond well to those found in the North Atlantic and some places in China, which probably results from the global climate changes in the Holocene.
中文关键词	滴哨沟湾剖面 ; 粒度 ; 气候变化 ; 全新世 ; 毛乌素沙漠
英文关键词	Dishaogouwan section grain-size climate change Holocene Mu Us Desert
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:5679210
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234046
作者单位	1.华南师范大学地理科学学院, 黄土与第四纪地质国家重点实验室, 广州, 广东 510631, 中国; 2.华南师范大学地理科学学院, 广州, 广东 510631, 中国; 3.惠州学院旅游系, 惠州, 广东 516007, 中国; 4.广西师范学院规划与地理科学学院, 南宁, 广西 530001, 中国
推荐引用方式 GB/T 7714	舒培仙,李保生,牛东风,等. 毛乌素沙漠东南缘滴哨沟湾剖面DGS1层段粒度特征及其指示的全新世气候变化[J],2016,36(3):448-457.
APA	舒培仙.,李保生.,牛东风.,王丰年.,温小浩.,...&陈琼.(2016).毛乌素沙漠东南缘滴哨沟湾剖面DGS1层段粒度特征及其指示的全新世气候变化.地理科学,36(3),448-457.
MLA	舒培仙,et al."毛乌素沙漠东南缘滴哨沟湾剖面DGS1层段粒度特征及其指示的全新世气候变化".地理科学 36.3(2016):448-457.