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DOI	10.1016/j.yqres.2013.07.007
	Late Pliocene-Quaternary evolution of redox conditions in the western Qaidam paleolake (NE Tibetan Plateau) deduced from Mn geochemistry in the drilling core SG-1
	Yang, Yibo; Fang, Xiaomin; Appel, Erwin; Galy, Albert; Li, Minghui; Zhang, Weilin
通讯作者	Fang, XM (通讯作者)
发表日期	2013
ISSN	0033-5894
EISSN	1096-0287
起始页码	586
结束页码	595
卷号	80 期号:3
英文摘要	Manganese (Mn) in lake sediments reacts strongly to changes of redox conditions. This study analyzed Mn concentrations in oxides, carbonates, and bulk phases of the calcareous lacustrine sediments of a 938.5-m-long core (SG-1) taken from the western Qaidam Basin, well dated from 2.77 Ma to 0.1 Ma. Comparisons of extractions from diluted hydrochloric acid, acetic acid and citrate-bicarbonate-dithionite demonstrate that variations of Mn concentrations from acetic acid leaching (Mn-HOAc) are mostly responsible for Mn (II) fluctuations in the carbonate phase. Taking into account the relevant processes during weathering, transportation, deposition and post-deposition of Mn-bearing rocks, we conclude that Mn input from catchment weathering and paleolake redox condition provide the primary controls on variations in the Mn records of carbonate and oxide phases. We propose Mn-HOAC as a new sensitive indicator of paleolake redox evolution and catchment-scale climate change. The Mn-HOAC variations show a long-term upward decreasing trend, indicating a long-term decrease of Mn input from catchment weathering associated with increasing oxygen content in the paleolake bottom water. The great similarities of the Mn-HOAC record with other regional and global records suggest that paleolake redox changes and climatic drying in the Qaidam Basin may be largely related to global cooling. (C) 2013 University of Washington. Published by Elsevier Inc All rights reserved.
关键词	CHINESE LOESS PLATEAU ANOXIC MARINE-SEDIMENTS LAKE-SEDIMENTS TRACE-ELEMENTS BASIN MANGANESE DEPOSITS CLIMATE ENVIRONMENT MINERALS
英文关键词	Late Pliocene-Quaternary; Qaidam Basin; Manganese geochemistry; Lake redox conditions; Asian inland drying
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000327285500023
来源期刊	QUATERNARY RESEARCH
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/258220
推荐引用方式 GB/T 7714	Yang, Yibo,Fang, Xiaomin,Appel, Erwin,et al. Late Pliocene-Quaternary evolution of redox conditions in the western Qaidam paleolake (NE Tibetan Plateau) deduced from Mn geochemistry in the drilling core SG-1[J]. 中国科学院青藏高原研究所,2013,80(3).
APA	Yang, Yibo,Fang, Xiaomin,Appel, Erwin,Galy, Albert,Li, Minghui,&Zhang, Weilin.(2013).Late Pliocene-Quaternary evolution of redox conditions in the western Qaidam paleolake (NE Tibetan Plateau) deduced from Mn geochemistry in the drilling core SG-1.QUATERNARY RESEARCH,80(3).
MLA	Yang, Yibo,et al."Late Pliocene-Quaternary evolution of redox conditions in the western Qaidam paleolake (NE Tibetan Plateau) deduced from Mn geochemistry in the drilling core SG-1".QUATERNARY RESEARCH 80.3(2013).