Effects of feldspar contamination on equivalent dose and the shape of growth curve for OSL of silt-sized quartz extracted from Chinese loess

ISL OpenIR > 青海盐湖研究所知识仓储

	Effects of feldspar contamination on equivalent dose and the shape of growth curve for OSL of silt-sized quartz extracted from Chinese loess
	Lai, Zhongping1,2 ; Brueckner, Helmut 2
	2008
发表期刊	GEOCHRONOMETRIA
卷号	30 页码:49-53
关键词	Blsl Irsl Equivalent Dose Chinese Loess Quartz Luminescence Feldspar Luminescence
摘要	This study examines the effects of feldspar contamination of different extent (by fluorosilicic acid etching for different time periods and mixing pure quartz with different percentage of un-etched grains) on blue-light stimulated luminescence (BLSL) of quartz (38-63 mu m) for Chinese loess. In particular, the D-e values and the shape of growth curves will be examined. The results show that: (1) The D-e determined using feldspar in Chinese loess is obviously underestimated, and infra-red stimulated luminescence (IRSL) has a greater underestimation than BLSL. For aliquots with no fluorosilicic acid etching, an IRSL D-e underestimation of similar to 30% is observed for a sample with an expected age of similar to 22 ka, similar to 19% underestimation for BLSL, and similar to 10% for post-IR BLSL. For quartz BLSL, the contamination of feldspar, which has not dissolved by fluorosilicic acid etching, will inevitably lead to age underestimation. We suggest that the IR-checking should be performed for every single aliquot. An aliquot should be excluded from the final D-e calculation if obvious IRSL signal was observed. (2) For the sample under examination blue LED stimulation can reset both IRSL and BLSL signals of feldspars, while IR stimulation cannot reset the BLSL of feldspars. (3) For multiple-mineral aliquot the growth curve shape of the post-IR BLSL is different from that of the IRSL, and within 25 Gy it is identical to that of the pure quartz BLSL. The contamination of feldspars in quartz will change the shape of a growth curve for quartz BLSL.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/5874
专题	青海盐湖研究所知识仓储盐湖地质与环境实验室
作者单位	1.Chinese Acad Sci, Qinghai Inst Salt Lakes, Luminescence Dating Lab, Xining 810008, Peoples R China 2.Univ Marburg, Fac Geog, D-35032 Marburg, Germany
推荐引用方式 GB/T 7714	Lai, Zhongping,Brueckner, Helmut. Effects of feldspar contamination on equivalent dose and the shape of growth curve for OSL of silt-sized quartz extracted from Chinese loess[J]. GEOCHRONOMETRIA,2008,30:49-53.
APA	Lai, Zhongping,&Brueckner, Helmut.(2008).Effects of feldspar contamination on equivalent dose and the shape of growth curve for OSL of silt-sized quartz extracted from Chinese loess.GEOCHRONOMETRIA,30,49-53.
MLA	Lai, Zhongping,et al."Effects of feldspar contamination on equivalent dose and the shape of growth curve for OSL of silt-sized quartz extracted from Chinese loess".GEOCHRONOMETRIA 30(2008):49-53.