OSL chronology for lacustrine sediments recording high stands of GahaiLake in Qaidam Basin, northeastern Qinghai-Tibetan Plateau

ISL OpenIR > 青海盐湖研究所知识仓储

	OSL chronology for lacustrine sediments recording high stands of GahaiLake in Qaidam Basin, northeastern Qinghai-Tibetan Plateau
	Fan, QiShun; Lai, ZhongPing; Long, Hao; Sun, YongJuan; Liu, XiangJun
	2010
发表期刊	QUATERNARY GEOCHRONOLOGY
ISSN	1871-1014
卷号	5 期号:2-3 页码:223-227
摘要	The Qaidam Basin in the northeastern Qinghai-Tibetan Plateau (QTP) is one of the largest hyper-arid intermontane basins in the northern hemisphere, and has abundant records for the study on palaeo-lake level fluctuations and palaeoclimatic changes. Significant efforts have been invested to define the timing of shoreline deposits using radiocarbon dating. However, due to the dating limit, the absence of organic materials and carbon reservoir effects for radiocarbon dating in arid areas, it is difficult to establish a reliable chronology for shoreline deposits. Therefore, controversy exists regarding the chronology for the high lake level in the Qaidam Basin, as well in the QTP. Some proposed that high lake levels occurred during late Marine Isotope Stage (MIS) 3, while others recently argued that the highest lake level in the QTP and adjacent regions existed in MIS 5. In Gahai Lake (now a salt lake), we investigated a section comprising lacustrine and shoreline deposits, which was about 25 m above the present lake level. Seven samples were collected for quartz optically stimulated luminescence (OSL) dating. A sample collected from a fine sand layer (the bottom of the section, and 12 m above the present lake level), which was assumed to have been deposited underwater, gave an OSL age of 82 +/- 8 ka. It suggested that the lake level was at least 12 m higher than present in late MIS 5. The high lake level could maintain till about 73 +/- 6 ka, and then decreased. This lake level decrease resulted in a gravel layer deposit between 73 +/- 6 and 63 +/- 6 ka (roughly during MIS 4). The lake level rose again (about 24 m above the present lake level) between 63 +/- 6 and 55 +/- 5 ka (roughly in early MIS 3). No lacustrine or shoreline deposits higher than the top of the current section were found around Gahai Lake. Thus, higher than present lake levels in Gahai Lake occurred in both late MIS 5 and early MIS 3. (C) 2009 Elsevier B.V. All rights reserved. The Qaidam Basin in the northeastern Qinghai-Tibetan Plateau (QTP) is one of the largest hyper-arid intermontane basins in the northern hemisphere, and has abundant records for the study on palaeo-lake level fluctuations and palaeoclimatic changes. Significant efforts have been invested to define the timing of shoreline deposits using radiocarbon dating. However, due to the dating limit, the absence of organic materials and carbon reservoir effects for radiocarbon dating in arid areas, it is difficult to establish a reliable chronology for shoreline deposits. Therefore, controversy exists regarding the chronology for the high lake level in the Qaidam Basin, as well in the QTP. Some proposed that high lake levels occurred during late Marine Isotope Stage (MIS) 3, while others recently argued that the highest lake level in the QTP and adjacent regions existed in MIS 5. In Gahai Lake (now a salt lake), we investigated a section comprising lacustrine and shoreline deposits, which was about 25 m above the present lake level. Seven samples were collected for quartz optically stimulated luminescence (OSL) dating. A sample collected from a fine sand layer (the bottom of the section, and 12 m above the present lake level), which was assumed to have been deposited underwater, gave an OSL age of 82 +/- 8 ka. It suggested that the lake level was at least 12 m higher than present in late MIS 5. The high lake level could maintain till about 73 +/- 6 ka, and then decreased. This lake level decrease resulted in a gravel layer deposit between 73 +/- 6 and 63 +/- 6 ka (roughly during MIS 4). The lake level rose again (about 24 m above the present lake level) between 63 +/- 6 and 55 +/- 5 ka (roughly in early MIS 3). No lacustrine or shoreline deposits higher than the top of the current section were found around Gahai Lake. Thus, higher than present lake levels in Gahai Lake occurred in both late MIS 5 and early MIS 3. (C) 2009 Elsevier B.V. All rights reserved.
语种	英语
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/1926
专题	青海盐湖研究所知识仓储
推荐引用方式 GB/T 7714	Fan, QiShun,Lai, ZhongPing,Long, Hao,et al. OSL chronology for lacustrine sediments recording high stands of GahaiLake in Qaidam Basin, northeastern Qinghai-Tibetan Plateau[J]. QUATERNARY GEOCHRONOLOGY,2010,5(2-3):223-227.
APA	Fan, QiShun,Lai, ZhongPing,Long, Hao,Sun, YongJuan,&Liu, XiangJun.(2010).OSL chronology for lacustrine sediments recording high stands of GahaiLake in Qaidam Basin, northeastern Qinghai-Tibetan Plateau.QUATERNARY GEOCHRONOLOGY,5(2-3),223-227.
MLA	Fan, QiShun,et al."OSL chronology for lacustrine sediments recording high stands of GahaiLake in Qaidam Basin, northeastern Qinghai-Tibetan Plateau".QUATERNARY GEOCHRONOLOGY 5.2-3(2010):223-227.

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
1-s2.0-S187110140900（662KB）			开放获取	CC BY-NC-SA	浏览请求全文