亚洲中部干旱区黄土释光测年研究进展及其问题

doi:10.11867/j.issn.1001-8166.2018.01.0093

地球科学进展 ›› 2018, Vol. 33 ›› Issue (1): 93 -102. doi: 10.11867/j.issn.1001-8166.2018.01.0093

王蕾彬 ¹(

), 魏海涛 ¹, 贾佳 ¹, 李国强 ¹, 陈发虎 ^1, ^2, ^*(

)

1.兰州大学资源环境学院西部环境教育部重点实验室,甘肃兰州 730000
2.中国科学院青藏高原地球科学卓越创新中心, 北京 100101

收稿日期:2017-07-18 修回日期:2017-12-13 出版日期:2018-01-10
通讯作者: 陈发虎 E-mail:wanglb15@lzu.edu.cn;fhchen@itpcas.ac.cn
基金资助:
中国科学院国际合作局对外合作重点项目“一带一路”国际合作专项(编号:131C11KYSB20160061);中国科学院学部咨询项目“欧亚腹地环境变迁与丝路文明兴衰的战略研究”(编号:2017ZWH006A-018)资助

Advances and Issues in Luminescence Dating of Loess Deposits in Arid Central Asia

Leibin Wang ¹( ), Haitao Wei ¹, Jia Jia ¹, Guoqiang Li ¹, Fahu Chen ^1, ^2, ^*( )

1.Key Laboratory of West China’s Environmental System, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
2.CAS Center for Excellence in Tibetan Plateau Earth Sciences of the Chinese Academy of Sciences, Beijing 100101, China

Received:2017-07-18 Revised:2017-12-13 Online:2018-01-10 Published:2018-03-06
Contact: Fahu Chen E-mail:wanglb15@lzu.edu.cn;fhchen@itpcas.ac.cn
About author:
First author:Wang Leibin(1989-), female, Lingqiu County, Shanxi Province,Ph. D student. Research areas include optical dating.E-mail:wanglb15@lzu.edu.cn
Supported by:
Project supported by the International Partnership Program of Chinese Academy of Sciences “CAS Special Project on International Cooperation along the Belt and Road Initiative”(No.131C11KYSB20160061);The Consulting Program of Chinese Academy of Sciences “The strategic research on the environmental changes of Eurasian hinterland and the prosperity and decline of the Silk Road civilization”(No.2017ZWH006A-018)

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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。

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

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.

Key words: Arid central Asia, Loess deposits, Quartz OSL dating, K-feldspar pIRIR and MET-pIRIR dating.

中图分类号:

P597+.3

图1 研究区位置和发表的黄土沉积记录研究点分布图
a.Toshan剖面 ^{[

50
]};b.Darai Kalon剖面 ^{[

44
]};c.Orkutsay剖面 ^{[

38
]};d.Bishkek剖面 ^{[

49
]};e.Remsowka剖面 ^{[

18
]};f.昭苏波马(ZSP)剖面 ^{[

20
]};g.塔勒德(TLD)剖面 ^{[

42
]};h.肖尔布拉克(XEBLK)剖面 ^{[

47
]};i.尼勒克(NLK)剖面 ^{[

21
,

46
]};j.则克台(ZKT)剖面 ^{[

18
,

19
]};k.鹿角湾(LJW)/ 鹿角湾10(LJW10)剖面 ^{[

43
]};l.水西沟(SXG)剖面 ^{[

43
]};m.柏杨河(BYH)剖面 ^{[

48
]}

Fig.1 Location of the study area and published loess record sites in the arid Central Asia
a:Toshan section ^{[

50
]}.b:Darai Kalon section ^{[

44
]}.c:Orkutsay section ^{[

38
]}.d:Bishkek section ^{[

49
]}.e:Remsowka section ^{[

18
]}.f:Zhaosuboma(ZSP) section ^{[

20
]}.g:Talede (TLD) section ^{[

42
]}.h:Xiaoerbulake (XEBLK) section ^{[

47
]}.i:Nilka(NLK) section ^{[

21
,

46
]}.j:Zeketai (ZKT) section ^{[

18
,

19
]}.k:Lujiaowan (LJW) / Lujiaowan10 (LJW10) section ^{[

43
]}.l:Shuixigou (SXG) section ^{[

43
]}.m:Baiyanghe (BYH) section ^{[

48
]}

图2 中亚3个黄土剖面石英光释光测年结果以及 ¹⁴C测年结果
(a)新疆则克台(ZKT)剖面 ^{[

18
,

19
]};(b)新疆尼勒克(NLK)剖面 ^{[

21
,

46
]};(c)吉尔吉斯斯坦Bishkek剖面 ^{[

49
]}

Fig.2 The quartz OSL dating results and ¹⁴C results from three loess section in the arid central Asia
(a)Zeketai (ZKT) loess section in Xinjiang Uygur Autonomous Region of China ^{[

18
,

19
]}. (b) Nilka (NLK) section in Xinjiang Uygur Autonomous Region of China ^{[

21
,

46
]}. (c) Bishkek loess section in Kyrgyz Republic ^{[

49
]}

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