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DOI	10.1016/j.quaint.2007.12.008
	Mineralogy and geochemistry of the Holocene lacustrine sediments in Nam Co, Tibet
	Li, Minghui; Kang, Shichang; Zhu, Liping; You, Qinglong; Zhang, Qianggong; Wang, Junbo
发表日期	2008
ISSN	1040-6182
EISSN	1873-4553
起始页码	105
结束页码	116
卷号	187
英文摘要	The carbonates, clays and major chemical compositions of lacustrine sediments in Nam Co (Lake) were examined by X-ray diffraction, scanning electron microscopy and chemical analysis. Carbonates include monohydrocalcite (MHC, first report from China and in a high-altitude lake), low-Mg calcite and traces of dolomite. MHC in Nam Co is developed in water (1.8 g/L) with high Mg/Ca molar ratios (10.03-15.03), high pH (8.04-9.72) and the presence of bacteria, algae, diatom and ostracoda. Illite and Mg-chlorite provide a strong evidence for physical weathering in the Holocene. Most Ca and Sr in sediments originate from carbonates as the molar ratios of Ca and CO23- are all less than 1 and the curve of Sr is very similar to that of Ca. However, most of the Mg, Fe and Rb are from clays. The lake water shifted from a fresh water environment to an evaporative, alkaline environment by 2.06 cal. ka BP. There was a depositional event that the depositional rate changed from 0.134 to 1.639 mm/a at about 2 cal. ka BP. (C) 2008 Elsevier Ltd and INQUA. All rights reserved.
关键词	RARE-EARTH-ELEMENTS LAKE-SEDIMENTS DIFFERENT SALINITIES WESTERN TIBET LIQUID-MEDIA BASIN LAKE MONOHYDROCALCITE CARBONATE PLATEAU BIOMINERALIZATION
学科领域	Physical Geography; Geology
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000259051300010
来源期刊	QUATERNARY INTERNATIONAL
来源机构	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/111510
推荐引用方式 GB/T 7714	Li, Minghui,Kang, Shichang,Zhu, Liping,et al. Mineralogy and geochemistry of the Holocene lacustrine sediments in Nam Co, Tibet[J]. 中国科学院青藏高原研究所,2008,187.
APA	Li, Minghui,Kang, Shichang,Zhu, Liping,You, Qinglong,Zhang, Qianggong,&Wang, Junbo.(2008).Mineralogy and geochemistry of the Holocene lacustrine sediments in Nam Co, Tibet.QUATERNARY INTERNATIONAL,187.
MLA	Li, Minghui,et al."Mineralogy and geochemistry of the Holocene lacustrine sediments in Nam Co, Tibet".QUATERNARY INTERNATIONAL 187(2008).