武汉地区长江流域冲积湖沉积物全新世OSL年代

IF 1.2 4区地球科学 Q3 Earth and Planetary Sciences

Geochronometria Pub Date : 2021-01-01 DOI:10.2478/GEOCHR-2020-0012

Chuanyi Wei, Huasong Zhang, Chang’an Li, Yufen Zhang, Yawei Li, Mingming Jia, Guo-Qiang Li, Yonghui Leng

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引用次数: 0

摘要

摘要武汉地区位于长江流域中部，受东亚季风影响较大。广泛发育的全新世流感湖相沉积物是重建古气候变化和地质环境演化的理想材料，其中年代问题是一个关键问题。在本研究中，从流感湖序列中采集了20个发光测年样品，并通过剂量回收试验和热传递试验的发光特性检验了石英OSL测年对这些样品的可靠性。我们的研究结果表明，不同粒度的4～11μm、38～63μm和90～125μm在埋葬前都得到了很好的漂白。测年结果表明，年龄在0.8±0.1～7岁之间。4.25～38.55m之间为9±0.7ka，大部分在正常误差范围内遵循地层序列和其他气候记录。无序的OSL年龄可能是由复杂的运输沉积过程引起的。因此，SAR-SGC协议的OSL定年方法可以为大型河流沉积系统中全新世流感湖相沉积提供一个重要的年代。

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Holocene OSL Chronology of Flu-Lacustrine Sediments in Yangtze River Basin, Wuhan Area, China

Abstract Wuhan area located middle Yangtze River Basin, is dominated by East Asian Monsoon. Widely developed Holocene flu-lacustrine sediments are ideal materials for the reconstruction of paleoclimate change and geo-environment evolution, for which the chronology is a key issue. In this study, 20 luminescence dating samples were collected from a flu-lacustrine sequence and the reliability of the quartz OSL dating to these samples were checked by using luminescence characteristics of dose recovery test and thermos transfer test. Our results indicate that different grain size fraction of 4∼11 μm, 38∼63 μm, and 90∼125 μm were well-bleached before burial. Dating results show that all these ages range from 0.8 ± 0.1 to 7. 9 ± 0.7 ka between 4.25 and 38.55 m, and most of them follow the stratigraphic sequence and other climatic recorder within the normal range of error. Disordered OSL ages may be caused by complicated transport-deposit processes. As a consequence, OSL dating method of SAR-SGC protocol could provide a significant chronology for Holocene flu-lacustrine sediment in large river depo-system.

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来源期刊

Geochronometria 地学-地球科学综合

CiteScore

2.20

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Geochronometria is aimed at integrating scientists developing different methods of absolute chronology and using them in different fields of earth and other natural sciences and archaeology. The methods in use are e.g. radiocarbon, stable isotopes, isotopes of natural decay series, optically stimulated luminescence, thermoluminescence, EPR/ESR, dendrochronology, varve chronology. The journal publishes papers that are devoted to developing the dating methods as well as studies concentrating on their applications in geology, palaeoclimatology, palaeobiology, palaeohydrology, geocgraphy and archaeology etc.