干旱区生态环境知识资源中心(Arid): 黄土中石英的含量与结晶度指数的测定

Arid

	黄土中石英的含量与结晶度指数的测定
其他题名	DETERMINATION OF QUARTZ CONTENT AND CRYSTALLINITY INDEX FROM LOESS SAMPLES
	赵剑波 1; 陈洪云 2; 宋友桂 1; 孙有斌 1
来源期刊	海洋地质与第四纪地质
ISSN	0256-1492
出版年	2012
卷号	32 期号:5 页码:131-135
中文摘要	碎屑石英是风成黄土最主要的组成矿物,其结晶度指数与粉尘源区石英的母岩类型有关,其含量则可用于估算风尘通量变化进而恢复源区的干旱化历史。通过详细的探讨,揭示了测试条件及数据处理方法对石英含量和结晶度指数估算的可能影响。结果表明:(1)测量石英结晶度指数时扫描的步长和速度有别于测量石英含量时的参数设置;(2)数据处理时,先对数据进行人工手动扣除背景,结晶度指数要依据衍射图谱67.74°处和67.85°处的峰谷值进行估算,而石英含量的估算主要依据衍射图谱中20.9°处石英峰与28.4°处硅粉峰;(3)石英结晶度指数需要反复压片测量多次取平均值。
英文摘要	Clastic quartz is the main mineral component of the eolian loess.The Crystallinity Index(CI)of clastic quartz is related to the type of mother rock,and the quartz content(QC)can be used to estimate the dust flux change so as to restore the desertification history of the source area.The paper discussed in details the testing conditions and data processing methods,and the errors they may cause to the estimation of QC and CI.It is concluded that(1)The scanning step size and speed should be different when CI and QC are measured separately;(2)Before the data processing,the background should be deducted manually.CI was estimated by the diffraction peak value at 67.74°and the diffraction valley value at 67.85°,and the estimation of QC mainly depends on the diffraction quartz peak value at 20.9°and diffraction silicon peak value at 28.4°;(3)CI should be the average of repeated measurement by pressed methods.
中文关键词	中国黄土 ; 风尘石英 ; 结晶度指数 ; 石英含量 ; XRD测试
英文关键词	Chinese loess dust quartz crystallinity index quartz content XRD
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:4676482
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/228227
作者单位	1.中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 西安, 陕西 710075, 中国; 2.中国地质科学院水文地质环境地质研究所, 正定, 河北 050803, 中国
推荐引用方式 GB/T 7714	赵剑波,陈洪云,宋友桂,等. 黄土中石英的含量与结晶度指数的测定[J],2012,32(5):131-135.
APA	赵剑波,陈洪云,宋友桂,&孙有斌.(2012).黄土中石英的含量与结晶度指数的测定.海洋地质与第四纪地质,32(5),131-135.
MLA	赵剑波,et al."黄土中石英的含量与结晶度指数的测定".海洋地质与第四纪地质 32.5(2012):131-135.