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	亚洲中部干旱区黄土释光测年研究进展及其问题
其他题名	Advances and Issues in Luminescence Dating of Loess Deposits in Arid Central Asia
	王蕾彬; 魏海涛; 贾佳; 李国强; 陈发虎
发表日期	2018
ISSN	1001-8166
卷号	33 期号:1 页码:93-102
中文摘要	中亚干旱区广泛分布的黄土沉积为研究这一区域的大气粉尘、环境和气候演化提供了良好载体,而黄土年代学是气候环境研究的基础。近几十年来逐渐发展并日趋成熟的释光测年方法是建立黄土地层序列的重要手段。通过对中亚干旱区的测年进展(主要是释光测年)进行总结梳理,得到如下认识: ①释光测年方法与14C测年方法比较,测年范围更广,测年材料易得,在此区域黄土框架的建立中有广泛适用性; ②石英光释光单片再生法(SAR)能够用于建立中亚干旱区末次冰期以来黄土沉积的年代框架,但是需要考虑部分地区石英灵敏度偏低、不同粒径结果不一致等问题,这些问题的解决仍然需要更多的方法学的研究; ③长石的两步法(pIRIR)与多步法(MET-pIRIR)已经基本克服了传统IRSL方法中信号的明显异常衰退现象,在此区域可以建立MIS 7以来的年代框架,长石的灵敏度高,可以用来测试石英灵敏度低而无法得出可靠年代的样品,其测年范围比石英更广,在具体的应用中需要根据样品灵敏度高低、年老程度等因素综合考虑来建立年代框架。
英文摘要	High-resolution loess deposits are widely distributed in Arid Central Asia (ACA) and provide important records associated with dust transportation,paleoenvironmental and paleoclimatic evolution. The chronology is the foundation of the research into loess deposits as an environmental archive. In recent decades,the gradually developed optical dating method has been increasingly matured and become an important approach to establishing the loess-paleosol sequences. Here,we summarized and discussed previous work on loess chronology mainly based on optical dating approach in ACA. The following understandings have been listed: ① In comparison with optical dating method,the suitable material for 14C dating is uncommon in ACA. However,the dating range of luminescence dating is more extensive,and the dating materials are accessible. Thus,the optical dating is widely applicable in the establishment of loess framework in this area. ② Until now,the quartz Single Aliquot Regeneration (SAR) method can be applied to the establishment of loess-paleosol sequence since last glacial period. But several issues remain unaddressed. For example,the Optically Stimulated Luminescence (OSL) signal sensitivity of quartz grains are low in some areas. Furthermore,the results of OSL dating of different grain sizes within a single sample are inconsistent in some areas. The solution of these problems still requires more methodological research. ③ The post-IR IRSL (pIRIR) and multiple elevated temperature stimulation (MET-pIRIR) protoCols of feldspar have basically overcome the anomalous fading issue in the traditional IRSL dating process. In ACA,the framework since MIS 7 can be established with K-feldspar luminescence dating method. Compared with quartz luminescence characteristics, the K-feldspar luminescence signals are more sensitive and exhibit a high saturation level. In specific applications, it is necessary to establish the age frame according to the luminescence sensitivity,the age of samples or other factors.
关键词	中亚干旱区黄土沉积石英OSL测年钾长石pIRIR和MET-pIRIR测年
英文关键词	Arid central Asia;Loess deposits;Quartz OSL dating;K-feldspar pIRIR and MET-pIRIR dating
语种	中文
WOS研究方向	Geology
WOS类目	GEOLOGY
CSCD记录号	CSCD:6199703
来源期刊	地球科学进展
来源机构	兰州大学 ; 中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/1564
推荐引用方式 GB/T 7714	王蕾彬,魏海涛,贾佳,等. 亚洲中部干旱区黄土释光测年研究进展及其问题[J]. 兰州大学, 中国科学院青藏高原研究所,2018,33(1):93-102.
APA	王蕾彬,魏海涛,贾佳,李国强,&陈发虎.(2018).亚洲中部干旱区黄土释光测年研究进展及其问题.地球科学进展,33(1),93-102.
MLA	王蕾彬,et al."亚洲中部干旱区黄土释光测年研究进展及其问题".地球科学进展 33.1(2018):93-102.