干旱区生态环境知识资源中心(Arid): 塔克拉玛干沙漠石英氧同位素与粒级关系的研究

Arid

	塔克拉玛干沙漠石英氧同位素与粒级关系的研究
其他题名	Relationships between Oxygen Isotope Compositions of Quartz and Grain Size from Dune Sands and FluvialLacustrine Sediments in the Taklimakan Desert
	张峰 1; 付旭东 2
来源期刊	地质论评
ISSN	0371-5736
出版年	2016
卷号	62 期号:1 页码:73-82
中文摘要	沙漠与黄土的物源联系是黄土研究关注的问题之一。石英氧同位素可示踪物源,粒度被用以分析沉积环境,但在沙漠物源研究中将二者结合应用的报道尚不多。本文测定了塔克拉玛干沙漠沙丘沙和沙丘剖面中河湖相沉积物的粒度及不同粒级的石英氧同位素,结果显示:①沙丘沙以极细砂和细砂为主,粉砂和黏土含量很低;河湖相沉积物以粉砂和黏土为主,砂含量低于5%。②各粒级石英delta~(18)O_(smow)值介于13.8 ~ 19.7, 其中沙丘沙为13.8 ~ 19.7,河湖相沉积物为15.6 ~ 17.6;沙丘沙石英delta~(18)O值随粒级增大未呈现减小趋势,同一粒级石英的delta~(18)O值存在一定变异。③经比较,塔克拉玛干沙漠砂和粉砂粒级的石英delta~(l8)O值均高于中国其他沙漠,且< 20mum的石英delta~(18)O值与黄土高原的马兰黄土、洛川黄土一古土壤序列<20mum的石英delta~(l8)O值并无显著性差异。
英文摘要	Oxygen isotopic composition of quartz has been regarded as a good source tracer, and grain size analysis is widely applied to investigate sedimentary environment. However, there are few studies combining quartz delta~(18)O values with granulometry to explore provenance of aeolian sands in the Chinese deserts. In this paper, oxygen isotopic compositions of quartz in various size fractions and grain-size distribution were determined for fluviallacustrine sediments and dune sands from the Taklimakan desert, western China. The results show that dune sands are generally composed of very fine sand and fine sand,whereas fluvial-lacustrine sediments are almost dominated by silt and clay. The delta~(l8)O values in different size fractions range from 13.8 to 19.7, in which dune sands vary from 13.8 to 19.7, fluviallacustrine sediments are between 15.6 and 17.6%c. Quartz from these samples has delta~(18) O values which lie within the range of values considered to be indicative of both metamorphic and sedimentary rocks. The quartz delta~(18)O values of dune sands have no notable decreasing trend with increase of grain size, and their values have obvious differences between the same size fractions in the Taklimakan desert, which is not consistent with former studies. In contrast to other deserts of China, the delta~(18)O values of silt-grained and sand-grained quartz are the greatest in the Taklimakan desert. There are no significantly different in the delta~(18)O values of fine-grained (<20mum) quartz between Taklimakan desert, Malan Loess, and Luochuan loess-palaeosol sequence in the Chinese Loess Plateau.
中文关键词	塔克拉玛干沙漠 ; 黄土高原 ; 石英 ; 氧同位素 ; 粒度分布
英文关键词	Taklimakan desert Chinese Loess Plateau Quartz Oxygen isotope Grain size distribution
语种	中文
国家	中国
收录类别	CSCD
WOS类目	MULTIDISCIPLINARY SCIENCES
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:5610822
来源机构	新疆大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234122
作者单位	1.新疆大学, 绿洲生态教育部重点实验室, 乌鲁木齐, 新疆 830046, 中国; 2.河南大学环境与规划学院, 开封, 河南 475004, 中国
推荐引用方式 GB/T 7714	张峰,付旭东. 塔克拉玛干沙漠石英氧同位素与粒级关系的研究[J]. 新疆大学,2016,62(1):73-82.
APA	张峰,&付旭东.(2016).塔克拉玛干沙漠石英氧同位素与粒级关系的研究.地质论评,62(1),73-82.
MLA	张峰,et al."塔克拉玛干沙漠石英氧同位素与粒级关系的研究".地质论评 62.1(2016):73-82.