气候变化领域集成服务门户(CCPortal): Saline rhythm and climatic change since 20.6 kyr BP from the Qiulinanmu Playa Lake in Tibet

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DOI	10.1007/s13146-009-0001-x
	Saline rhythm and climatic change since 20.6 kyr BP from the Qiulinanmu Playa Lake in Tibet
	Li, Minghui; Kang, Shichang; Ge, Jun; Yi, Chaolu; Fang, Xiaomin
发表日期	2010
ISSN	0891-2556
EISSN	1878-5212
卷号	25 期号:1
英文摘要	A rare lacustrine rhythmite from the Qiulinanmu Playa Lake in Tibet is presented, which was composed of distinct layers of mirabilite, borax, and clay with thickness measuring 1.5-75 cm, 0.5-20 mm, and 0.5-30 mm, respectively. The thickness of each layer was measured in the field and dating was performed using C-14 and U data. The lake was previously supplied by river water, groundwater, and hot springs enriched in sodium, sulfur, and boron. Control factors on the rhythmite were climate oscillations and compositional differences of water. The adsorption of boron by clay minerals could be attributed to the alternation between clay and borax layers. Low temperature, high pH, and high evaporation exerted significant influences on the precipitation of original borax and mirabilite. In the evaporative lake, the precipitation of mirabilite (a mineral indicative of a cold-dry environment) was dominant and produced the asymmetric couplets. The lake water was poor in chloride and rich in sodium sulfate, and an abrupt change was observed at 11.4 cal. kyr BP. According to the laminated sediment and the thickness of the minerals, the climate was dry-cold with four sub-warm phases before 11.4 kyr BP (after 20.6-11.4 kyr BP), and wet-warm with four sub-cold pulses after 11.4 kyr BP (11.4-5.2 kyr BP). The two thickest mirabilite layers suggested extremely hard conditions after 20.6 kyr BP, and before 11.4 kyr BP, respectively.
关键词	Rhythmite Mirabilite Borax Clay Climate and environment Playa Tibet
学科领域	Geology
语种	英语
WOS研究方向	Geology
来源期刊	CARBONATES AND EVAPORITES
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111580
作者单位	Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Li, Minghui,Kang, Shichang,Ge, Jun,et al. Saline rhythm and climatic change since 20.6 kyr BP from the Qiulinanmu Playa Lake in Tibet[J]. 中国科学院西北生态环境资源研究院,2010,25(1).
APA	Li, Minghui,Kang, Shichang,Ge, Jun,Yi, Chaolu,&Fang, Xiaomin.(2010).Saline rhythm and climatic change since 20.6 kyr BP from the Qiulinanmu Playa Lake in Tibet.CARBONATES AND EVAPORITES,25(1).
MLA	Li, Minghui,et al."Saline rhythm and climatic change since 20.6 kyr BP from the Qiulinanmu Playa Lake in Tibet".CARBONATES AND EVAPORITES 25.1(2010).