干旱区生态环境知识资源中心(Arid): 2.5 ka BP以来额济纳绿洲沙丘的粒度特征及其反映的沉积过程

Arid

	2.5 ka BP以来额济纳绿洲沙丘的粒度特征及其反映的沉积过程
其他题名	Grain-size Characteristics of Sand Dunes in the Ejin Oasis since 2. 5 ka BP and Related Sedimentary Process
	温小浩 1; 李保生 1; 李森 2; 欧先交 1; 姚春霞 3; 罗开利 4; 曾兰华 1
来源期刊	地质学报
ISSN	0001-5717
出版年	2005
卷号	79 期号:5 页码:710-718
中文摘要	额济纳绿洲位于我国极端干旱区,该地额济纳剖面(41°46.36’N,101°09.26’E)的地层含1层现代流动沙丘、8层古流动沙丘、18层古半固定沙丘、14层古固定沙丘、2层沙质弱成土和2层沙黄土-亚沙土。根据对该剖面11个14C年代样品测试和263个粒度样品的分析结果,本文确定了这套以沙丘沙沉积为主的沉积序列主要是2.5 ka BP以来气候一风沙地貌过程的产物,并详细讨论了自那时以来不同沉积类型的粒度及其Mz、sigma和SC/D等分布规律和成因问题。这一研究结果表明:①额济纳剖面古流动沙丘沙、古半固定沙丘沙和古固定沙丘沙无论在粒度组成还是在Mz、sigma分布上,都分别与现代流动沙丘沙、半固定沙丘沙和固定沙丘沙颇为相似,这为该剖面沙丘类型的划分提供了重要依据;相对这三类沙丘沙而言,沙黄土-亚沙土和沙质弱成土的沙物质含量显著降低,而粉沙和粘土含量明显增高,显示出沙丘嗣后的较强的成土作用和一定的土壤化过程。②该剖面古流动沙丘沙或古半固定沙丘沙与上覆的古固定沙丘或沙黄土-亚沙土或者是沙质弱成土可以构成11.5个沉积旋回,其每一个旋回又表现为颗粒由粗变细,Mz(Phi)、SC/D由小到大和sigma显示的由分选好到变差的粒度旋回变化,代表...
英文摘要	The Ejin Oasis is located at an extremely arid area of China, where the Ejin section(41°46. 36’N,101°O9. 26’E)named by us includes 1 layer of modern mobile sand dunes, 8 layers of paleo-mobile sand dunes, 18 layers of paleo-semi-fixed sand dunes, 14 layers of paleo-fixed sand dunes, 2 layers of sandy immature soils and 2 layers of sandy loess to loess-like sand. Based on 11 samples for 14C dating and 263 samples for grain-size analysis, it has been confirmed in this paper that the sedimentary sequence composed mainly of dune deposition is a product of climate and geomorphological processes of wind-drifting sand. Grain-sizes of different sedimentary types and distribution regularities and geneses of Mz, a and SC/D are discussed in detail. The study shows that (1) the Paleo-mobile, paleo-fixed and paleo-semi-fixed sand dunes in the Ejin section are quite similar respectively to modern mobile, fixed and semi-fixed sand dunes in either grain-size composition or Mz and a distribution, thus it provides important evidence for the subdivision of dune types in the section. In comparison with the above three types of dunes, the content of sand substance of the sandy loess to loess-like sand and sandy immature soils markedly decreases, while the content of silt and clay obviously increases, indicating better pedogenesis and a certain soil-forming process. (2) The paleo-mobile sand dunes or paleo-semi-fixed sand dunes and the overlying paleo-fixed sand dunes and/or sandy loess to loess-like sand or sandy immature soils constitute 11.5 sedimentary cycles, each showing changes from coarser to finer particles, from small to large Mz(
中文关键词	额济纳绿洲 ; 粒度特征 ; 沉积过程 ; 季风环境变化
英文关键词	Ejin oasis grain-size characteristics sedimentary process monsoon environmental changes
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:2037070
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/206047
作者单位	1.华南师范大学地理科学学院, 广州, 广东 510631, 中国; 2.佛山大学旅游与资源环境系, 佛山, 广东 510631, 中国; 3.华东师范大学, 地理信息科学教育部开放实验室, 上海 200062, 中国; 4.广州市城市规划局白云区分局, 510405
推荐引用方式 GB/T 7714	温小浩,李保生,李森,等. 2.5 ka BP以来额济纳绿洲沙丘的粒度特征及其反映的沉积过程[J],2005,79(5):710-718.
APA	温小浩.,李保生.,李森.,欧先交.,姚春霞.,...&曾兰华.(2005).2.5 ka BP以来额济纳绿洲沙丘的粒度特征及其反映的沉积过程.地质学报,79(5),710-718.
MLA	温小浩,et al."2.5 ka BP以来额济纳绿洲沙丘的粒度特征及其反映的沉积过程".地质学报 79.5(2005):710-718.